JP6310334B2

JP6310334B2 - Insulation degradation diagnosis device and method for power cable or electrical equipment

Info

Publication number: JP6310334B2
Application number: JP2014117874A
Authority: JP
Inventors: 和彦米倉; 秀隆伊藤; 敏昭吉浦; 村上　清一; 清一村上; 克己梶谷; 松村　幸太郎; 幸太郎松村
Original assignee: Kyushu Electric Power Co Inc
Current assignee: Kyushu Electric Power Co Inc
Priority date: 2014-06-06
Filing date: 2014-06-06
Publication date: 2018-04-11
Anticipated expiration: 2034-06-06
Also published as: JP2015230289A

Description

この発明は、電力ケーブル（送電線、配電線及び屋内配線）又は電気機器の絶縁劣化診断装置及びその装置を用いた絶縁劣化診断方法に関するものであり、電力ケーブル又は電気機器を停電することなく電力ケーブル又は電気機器両端の接地線電流若しくは零相電流を検出するだけで、電力ケーブル又は電気機器における絶縁劣化箇所の標定及び表示を可能とする装置及び方法に関する。 The present invention relates to an insulation deterioration diagnosis device for a power cable (power transmission line, distribution line and indoor wiring) or an electric device, and an insulation deterioration diagnosis method using the device. The present invention relates to an apparatus and method that can determine and display an insulation deterioration point in a power cable or an electric device only by detecting a ground line current or a zero-phase current at both ends of the cable or the electric device.

電力ケーブル等の絶縁劣化を早期に発見するため、従来以下のように様々な手法が開発されている。
（１）直流漏れ電流法：直流高電圧を印加し、電力ケーブルの絶縁体に流れる直流漏れ電流値と電流の時間経過波形から絶縁劣化状態を診断するもの。
（２）直流重畳法又は低周波重畳法：活線に直流電流又は低周波電流を重畳し、漏れ電流の計測値から絶縁劣化状態を診断するもの。
（３）残留電荷法：電力ケーブルに直流電圧を印加し、絶縁体中に電荷を蓄積させた後に、電力ケーブルを接地する。絶縁体中に水トリーが発生していると水トリー部にのみ電荷が残留するが、電力ケーブルに交流電圧を印加するとその電荷が放出されるので、その放出量を残留電荷測定装置により検出し、その電荷量から絶縁劣化状態を診断するもの。
（４）損失電流法：損失電流中に含まれる第３次高調波成分から絶縁劣化状態を診断するもの。
（５）ケーブルシース破断検出法：ケーブルシース破断検出機能付き活線絶縁診断装置を用いて絶縁劣化状態を診断するもの。
しかし、（１）、（３）、（４）の方法は、電力ケーブルを停電させて測定する必要があり、（２）、（５）の方法は、活線で測定するための特殊装置が必要であった。
また、いずれの方法も手間がかかり、劣化していることは診断できても絶縁劣化箇所がどこに存在しているかを特定することはできなかった。 In order to detect insulation deterioration of power cables and the like at an early stage, various methods have been developed as follows.
(1) DC leakage current method: A method of diagnosing an insulation deterioration state from a DC leakage current value flowing through an insulator of a power cable and a time-lapse waveform of current when a DC high voltage is applied.
(2) DC superposition method or low-frequency superposition method: A method in which a direct current or low-frequency current is superimposed on a live wire and the insulation deterioration state is diagnosed from the measured value of leakage current.
(3) Residual charge method: A DC voltage is applied to the power cable to accumulate the charge in the insulator, and then the power cable is grounded. If a water tree is generated in the insulator, a charge remains only in the water tree. However, when an AC voltage is applied to the power cable, the charge is released. The amount of discharge is detected by a residual charge measuring device. , To diagnose the insulation deterioration state from the amount of charge.
(4) Loss current method: A method for diagnosing the state of insulation deterioration from the third harmonic component contained in the loss current.
(5) Cable sheath breakage detection method: A method of diagnosing an insulation deterioration state using a hot-wire insulation diagnostic device with a cable sheath breakage detection function.
However, the methods (1), (3), and (4) require measurement with the power cable interrupted, and the methods (2) and (5) require a special device for measuring live lines. It was necessary.
In addition, both methods are time-consuming, and even if it can be diagnosed that the deterioration has occurred, it has not been possible to identify where the insulation deterioration portion exists.

特許文献１（特開２０１１−２３７１８２号公報）には、図６に示すように、ケーブル(２)の端部外周上の遮蔽層に接続された接地線(５)に取り付けられる部分放電判別装置及びその部分放電判別装置を用いて接地線(５)に流れる放電電流を検出し、ケーブル(２)の絶縁劣化に伴う放電電流が発生しているか否かを判別する部分放電判別方法が開示されている。
部分放電判別装置は、接地線(５)に流れる電流を検出する変流器(７)、負荷抵抗(１３)、抵抗(１４)、増幅器(１５)、バンドパスフィルタ(１７)、ノイズ除去部(１９)、波形記憶部(２１)、特徴量導出部(２３)及び放電判定部(２５)を備えている。
特許文献１に開示されている部分放電判別装置及び部分放電判別方法によれば、ケーブル(２)を停電させることなく絶縁劣化に伴う放電電流が発生しているか否かを判別することができるが、絶縁劣化箇所がどこに存在しているかを特定することはできない。 In Patent Document 1 (Japanese Patent Laid-Open No. 2011-237182), as shown in FIG. 6, a partial discharge discriminating device attached to a ground line (5) connected to a shielding layer on the outer periphery of an end of a cable (2). And a partial discharge discriminating method for detecting the discharge current flowing through the ground line (5) using the partial discharge discriminating apparatus and discriminating whether or not the discharge current accompanying the insulation deterioration of the cable (2) is generated. ing.
The partial discharge discriminating apparatus includes a current transformer (7) for detecting a current flowing through the ground line (5), a load resistor (13), a resistor (14), an amplifier (15), a bandpass filter (17), and a noise removing unit. (19), a waveform storage unit (21), a feature amount derivation unit (23), and a discharge determination unit (25).
According to the partial discharge determination device and the partial discharge determination method disclosed in Patent Document 1, it is possible to determine whether or not a discharge current is generated due to insulation deterioration without causing a power failure of the cable (2). It is not possible to specify where the insulation degradation point exists.

特開２０１１−２３７１８２号公報JP2011-237182A

本発明は、停電させることなく活線状態で電力ケーブル又は電気機器の絶縁劣化を診断することができ、かつ、絶縁劣化に伴う内部放電、コロナ放電、沿面放電及びケーブル劣化に伴う零相劣化漏れ電流等（以下「部分放電」という。）が電力ケーブルのどこで発生しているかを特定又は電気機器のどの辺で発生しているかを区別することのできる絶縁劣化診断装置及び方法の提供を目的とする。 The present invention is capable of diagnosing insulation deterioration of a power cable or an electric device in a live line state without causing a power failure, and is capable of diagnosing internal discharge, corona discharge, creeping discharge, and zero-phase deterioration leakage accompanying cable deterioration. An object of the present invention is to provide an insulation deterioration diagnosis apparatus and method capable of identifying where electric current or the like (hereinafter referred to as “partial discharge”) is generated in a power cable or distinguishing which side of an electric device is generated. To do.

請求項１に係る発明の絶縁劣化診断装置は、電力ケーブルの一端側における接地線電流又は零相電流を検出する一端側電流検出手段と、該一端側電流検出手段によって所定時間毎に検出された一端側電流検出値を基準時計手段に同期させることが可能な計時手段から得た時刻情報とともに記録する一端側電流検出値記録手段と、親局に対して一端側情報を送信するとともにデータ検出指定時刻情報を受信する一端側送受信手段を少なくとも備える一端側子局と、前記電力ケーブルの他端側における接地線電流又は零相電流を検出する他端側電流検出手段と、該他端側電流検出手段によって所定時間毎に検出された他端側電流検出値を前記基準時計手段に同期させることが可能な計時手段から得た時刻情報とともに記録する他端側電流検出値記録手段と、前記親局に対して他端側情報を送信するとともにデータ検出指定時刻情報を受信する他端側送受信手段を少なくとも備える他端側子局と、前記一端側情報及び前記他端側情報を受信するとともにデータ検出指定時刻情報を送信する送受信手段と、該送受信手段によって受信した前記一端側情報及び前記他端側情報に基づいて部分放電箇所の標定及び表示を行う部分放電箇所標定手段を少なくとも備える前記親局を有する絶縁劣化診断装置であって、
前記一端側子局又は前記親局は、前記一端側電流検出値記録手段に記録された一定時間中の一端側電流検出値と時刻情報に基づいて、前記電力ケーブルの絶縁劣化に伴う部分放電を示す特徴を備えた一端側極大値情報又は一端側極小値情報を複数抽出する手段をさらに備え、
前記他端側子局又は前記親局は、前記他端側電流検出値記録手段に記録された一定時間中の他端側電流検出値と時刻情報に基づいて、前記電力ケーブルの絶縁劣化に伴う部分放電を示す特徴を備えた他端側極大値情報又は他端側極小値情報を複数抽出する手段をさらに備え、
前記部分放電箇所標定手段は、前記一端側極大値情報と前記他端側極大値情報、又は前記一端側極小値情報と前記他端側極小値情報から、部分放電箇所の標定に用いる一端側標定用時刻情報と他端側標定用時刻情報の組み合わせを抽出する標定用時刻情報抽出手段と、該標定用時刻情報抽出手段によって抽出された前記一端側標定用時刻情報と他端側標定用時刻情報の組み合わせ、前記電力ケーブルの両端間の距離及び前記電力ケーブルの両端間における電流伝搬速度に基づいて部分放電箇所の位置を計算する部分放電位置計算手段と、該部分放電位置計算手段による計算結果に基づいて前記部分放電箇所の位置に関する表示処理を行う表示処理手段と、前記部分放電箇所の位置を表示する表示手段を備えていることを特徴とする。 The insulation deterioration diagnosis device of the invention according to claim 1 is detected at predetermined intervals by one end side current detecting means for detecting a ground line current or zero phase current at one end side of the power cable, and the one end side current detecting means. One end side current detection value recording means for recording one end side current detection value together with time information obtained from time measuring means capable of synchronizing with the reference clock means, and one end side information is transmitted to the master station and data detection is designated. One end side slave station having at least one end side transmitting / receiving means for receiving time information, the other end side current detecting means for detecting a ground line current or zero phase current at the other end side of the power cable, and the other end side current detection The other end side current detection value is recorded together with the time information obtained from the time measuring means that can be synchronized with the reference clock means. And other end side slave station comprising at least the other end side transmitting / receiving means for transmitting the other end side information to the master station and receiving data detection designated time information, the one end side information and the other end side information Transmitting and receiving means for transmitting data detection designation time information, and partial discharge location determination means for determining and displaying partial discharge locations based on the one end side information and the other end side information received by the transmission and reception means An insulation deterioration diagnostic apparatus having at least the master station comprising:
The one end side slave station or the master station performs partial discharge accompanying insulation deterioration of the power cable based on the one end side current detection value and time information recorded in the one end side current detection value recording means during a predetermined time. Means for extracting a plurality of one-end-side maximum value information or one-end-side minimum value information having the characteristics shown;
The other end side slave station or the master station is accompanied by insulation deterioration of the power cable based on the other end side current detection value and time information recorded in the other end side current detection value recording means during a predetermined time. Means for extracting a plurality of other-end-side local maximum value information or other-end-side local minimum value information having characteristics indicating partial discharge;
The partial discharge location locating means uses the one end side localization used for the location of the partial discharge location from the one end side maximum value information and the other end side maximum value information, or the one end side minimum value information and the other end side minimum value information. Time information extraction means for extracting a combination of time information for the other end and time information for the other end side, and the time information for the one end side orientation and the time information for the other end side extracted by the time information extraction means for the other end The partial discharge position calculation means for calculating the position of the partial discharge location based on the combination of the distance between the both ends of the power cable and the current propagation speed between the both ends of the power cable, and the calculation result by the partial discharge position calculation means And a display processing means for performing a display process on the position of the partial discharge location, and a display means for displaying the position of the partial discharge location.

請求項２に係る発明の絶縁劣化診断方法は、電力ケーブルの一端側に設置された一端側子局において、一端側における接地線電流又は零相電流を検出する一端側電流検出手段によって所定時間毎に検出された一端側電流検出値を、基準時計手段に同期させることが可能な計時手段から得た時刻情報とともに一端側電流検出値記録手段に記録し、親局に対して一端側情報を送信し、前記電力ケーブルの他端側に設置された他端側子局において、他端側における接地線電流又は零相電流を検出する他端側電流検出手段によって所定時間毎に検出された他端側電流検出値を、前記基準時計手段に同期させることが可能な計時手段から得た時刻情報とともに他端側電流検出値記録手段に記録し、前記親局に対して他端側情報を送信し、前記親局において、前記一端側子局及び前記他端側子局から送信された前記一端側情報及び前記他端側情報を受信し、受信した前記一端側情報及び前記他端側情報に基づいて部分放電箇所の標定及び表示を行う絶縁劣化診断方法であって、
前記一端側子局又は前記親局において、前記一端側電流検出値記録手段に記録された一定時間中の一端側電流検出値と時刻情報に基づいて、前記電力ケーブルの絶縁劣化に伴う部分放電を示す特徴を備えた一端側極大値情報及び一端側極小値情報を複数抽出し、
前記他端側子局又は前記親局において、前記他端側電流検出値記録手段に記録された一定時間中の他端側電流検出値と時刻情報に基づいて、前記電力ケーブルの絶縁劣化に伴う部分放電を示す特徴を備えた他端側極大値情報及び他端側極小値情報を複数抽出し、
前記親局において、前記一端側極大値情報と前記他端側極大値情報、又は前記一端側極小値情報と前記他端側極小値情報から、部分放電箇所の標定に用いる一端側標定用時刻情報と他端側標定用時刻情報の組み合わせを抽出し、抽出された前記一端側標定用時刻情報と他端側標定用時刻情報の組み合わせ、前記電力ケーブルの両端間の距離及び前記電力ケーブルの両端間における電流伝搬速度に基づいて部分放電箇所の位置を計算し、計算された部分放電箇所の位置に基づいて前記部分放電箇所の位置に関する表示処理を行い、前記部分放電箇所の位置を表示手段に表示することを特徴とする。 The insulation deterioration diagnosis method according to the second aspect of the invention is the one end side slave station installed on one end side of the power cable, and the one end side current detecting means for detecting the ground line current or the zero-phase current on the one end side every predetermined time. The one end side current detection value detected at the time is recorded in the one end side current detection value recording means together with the time information obtained from the time measuring means that can be synchronized with the reference clock means, and the one end side information is transmitted to the master station. And the other end detected at predetermined time intervals by the other end side current detecting means for detecting the ground line current or the zero phase current at the other end side in the other end side slave station installed at the other end side of the power cable. The side current detection value is recorded in the other end side current detection value recording means together with the time information obtained from the time measuring means that can be synchronized with the reference clock means, and the other end side information is transmitted to the master station. , At the master station , Receiving the one end side information and the other end side information transmitted from the one end side slave station and the other end side slave station, and based on the received one end side information and the other end side information, An insulation deterioration diagnosis method for locating and displaying,
In the one end side slave station or the master station, based on the one end side current detection value and time information recorded in the one end side current detection value recording means, a partial discharge due to insulation deterioration of the power cable is performed. Extracting one end side maximum value information and one end side minimum value information having the characteristics shown,
In the other end side slave station or the master station, with the insulation deterioration of the power cable, based on the other end side current detection value and time information recorded in the other end side current detection value recording means during a predetermined time. Extracting a plurality of other end side maximum value information and other end side minimum value information having features indicating partial discharge,
In the master station, one end side positioning time information used for positioning a partial discharge location from the one end side maximum value information and the other end side maximum value information, or from the one end side minimum value information and the other end side minimum value information. And the other end side orientation time information are extracted, the extracted one end side orientation time information and the other end side orientation time information are combined, the distance between both ends of the power cable, and between both ends of the power cable. The position of the partial discharge location is calculated based on the current propagation speed in the display, the display processing relating to the location of the partial discharge location is performed based on the calculated location of the partial discharge location, and the position of the partial discharge location is displayed on the display means. It is characterized by doing.

請求項３に係る発明の絶縁劣化診断装置は、電気機器の入力側配線における零相電流を検出する入力側電流検出手段と、該入力側電流検出手段によって所定時間毎に検出された入力側電流検出値を基準時計手段に同期させることが可能な計時手段から得た時刻情報とともに記録する入力側電流検出値記録手段と、親局に対して入力側情報を送信するとともにデータ検出指定時刻情報を受信する入力側送受信手段を少なくとも備える入力側子局と、前記電気機器の接地線電流を検出する出力側電流検出手段と、該出力側電流検出手段によって所定時間毎に検出された出力側電流検出値を前記基準時計手段に同期させることが可能な計時手段から得た時刻情報とともに記録する出力側電流検出値記録手段と、前記親局に対して出力側情報を送信するとともにデータ検出指定時刻情報を受信する出力側送受信手段を少なくとも備える出力側子局と、前記入力側情報及び前記出力側情報を受信するとともにデータ検出指定時刻情報を送信する送受信手段と、該送受信手段によって受信した前記入力側情報及び前記出力側情報に基づいて部分放電箇所の標定及び表示を行う部分放電箇所標定手段を少なくとも備える前記親局を有する絶縁劣化診断装置であって、
前記入力側子局又は前記親局は、前記入力側電流検出値記録手段に記録された一定期間中の入力側電流検出値と時刻情報に基づいて、前記電気機器の絶縁劣化に伴う部分放電を示す特徴を備えた入力側極大値情報又は入力側極小値情報を複数抽出する手段をさらに備え、
前記出力側子局又は前記親局は、前記出力側電流検出値記録手段に記録された一定期間中の出力側電流検出値と時刻情報に基づいて、前記電気機器の絶縁劣化に伴う部分放電を示す特徴を備えた出力側極大値情報又は出力側極小値情報を複数抽出する手段をさらに備え、
前記部分放電箇所標定手段は、前記入力側極大値情報と前記出力側極大値情報、又は前記入力側極小値情報と前記出力側極小値情報から、部分放電箇所の標定に用いる入力側標定用時刻情報と出力側標定用時刻情報の組み合わせを抽出する標定用時刻情報抽出手段と、該標定用時刻情報抽出手段によって抽出された前記入力側標定用時刻情報と出力側標定用時刻情報の組み合わせ、前記電気機器の配線の長さ及び前記電気機器の両端間における電流伝搬速度に基づいて部分放電箇所の位置を計算する部分放電位置計算手段と、該部分放電位置計算手段による計算結果に基づいて前記部分放電箇所の区別に関する表示処理を行う表示処理手段と、前記部分放電箇所の区別を表示する表示手段を備えていることを特徴とする。 An insulation deterioration diagnosis apparatus according to a third aspect of the present invention includes an input-side current detection unit that detects a zero-phase current in an input-side wiring of an electrical device, and an input-side current detected by the input-side current detection unit every predetermined time. Input side current detection value recording means for recording the detected value together with time information obtained from the time measuring means capable of synchronizing with the reference clock means, and transmitting the input side information to the master station and data detection designated time information. An input side slave station having at least an input side transmission / reception means for receiving, an output side current detection means for detecting a ground line current of the electric device, and an output side current detection detected at predetermined time intervals by the output side current detection means Output-side current detection value recording means for recording the value together with time information obtained from the time measuring means capable of synchronizing the value with the reference clock means, and transmitting the output-side information to the master station And an output side slave station that includes at least an output side transmission / reception means for receiving data detection designated time information, a transmission / reception means for receiving the input side information and the output side information and transmitting data detection designation time information, and the transmission / reception means An insulation deterioration diagnostic apparatus having the master station comprising at least partial discharge location locating means for performing localization and display of partial discharge locations based on the input side information and the output side information received by:
The input side slave station or the master station performs partial discharge due to insulation deterioration of the electrical equipment based on the input side current detection value and time information recorded in the input side current detection value recording means during a certain period. Further comprising means for extracting a plurality of input side maximum value information or input side minimum value information having the characteristics shown,
The output side slave station or the master station performs partial discharge accompanying insulation deterioration of the electrical device based on the output side current detection value and time information during a certain period recorded in the output side current detection value recording means. Further comprising means for extracting a plurality of output-side local maximum value information or output-side local minimum value information having the characteristics shown,
The partial discharge location determination means uses the input side local maximum value information and the output side local maximum value information, or the input side local minimum value information and the output side local minimum value information. An orientation time information extraction means for extracting a combination of information and output side orientation time information, a combination of the input side orientation time information and the output side orientation time information extracted by the orientation time information extraction means, Partial discharge position calculation means for calculating the position of the partial discharge location based on the length of the wiring of the electrical equipment and the current propagation speed between both ends of the electrical equipment, and the part based on the calculation result by the partial discharge position calculation means It is characterized by comprising display processing means for performing display processing relating to the distinction between discharge locations, and display means for displaying the distinction between partial discharge locations.

請求項４に係る発明の絶縁劣化診断方法は、電気機器の入力側に設置された入力側子局において、入力側配線における零相電流を検出する入力側電流検出手段によって所定時間毎に検出された入力側電流検出値を、基準時計手段に同期させることが可能な計時手段から得た時刻情報とともに入力側電流検出値記録手段に記録し、親局に対して入力側情報を送信し、前記電気機器の出力側に設置された出力側子局において、接地線電流を検出する出力側電流検出手段によって所定時間毎に検出された出力側電流検出値を、前記基準時計手段に同期させることが可能な計時手段から得た時刻情報とともに出力側電流検出値記録手段に記録し、前記親局に対して出力側情報を送信し、前記親局において、前記入力側子局及び前記出力側子局から送信された前記入力側情報及び前記出力側情報を受信し、受信した前記入力側情報及び前記出力側情報に基づいて部分放電箇所の標定及び表示を行う絶縁劣化診断方法であって、
前記入力側子局又は前記親局において、前記入力側電流検出値記録手段に記録された一定期間中の入力側電流検出値と時刻情報に基づいて、前記電気機器の絶縁劣化に伴う部分放電を示す特徴を備えた入力側極大値情報又は入力側極小値情報を複数抽出し、
前記出力側子局又は前記親局において、前記出力側電流検出値記録手段に記録された一定期間中の出力側電流検出値と時刻情報に基づいて、前記電気機器の絶縁劣化に伴う部分放電を示す特徴を備えた出力側極大値情報又は出力側極小値情報を複数抽出し、
前記親局において、前記入力側極大値情報と前記出力側極大値情報、又は前記入力側極小値情報と前記出力側極小値情報から、部分放電箇所の標定に用いる入力側標定用時刻情報と出力側標定用時刻情報の組み合わせを抽出し、抽出された前記入力側標定用時刻情報と出力側標定用時刻情報の組み合わせ、前記電気機器の配線の長さ及び前記電気機器の両端間における電流伝搬速度に基づいて部分放電箇所の位置を計算し、計算された部分放電箇所の位置に基づいて前記部分放電箇所の区別に関する表示処理を行い、前記部分放電箇所の区別を表示手段に表示することを特徴とする。 The insulation deterioration diagnosis method of the invention according to claim 4 is detected at predetermined time intervals by input side current detection means for detecting a zero-phase current in the input side wiring in the input side slave station installed on the input side of the electrical equipment. The input side current detection value is recorded in the input side current detection value recording means together with the time information obtained from the time measuring means that can be synchronized with the reference clock means, and the input side information is transmitted to the master station, In the output side slave station installed on the output side of the electrical equipment, the output side current detection value detected every predetermined time by the output side current detection means for detecting the ground line current may be synchronized with the reference clock means. Recorded in the output side current detection value recording means together with the time information obtained from the possible time measuring means, and transmitted the output side information to the master station. In the master station, the input slave station and the output slave station Send from The receiving the input information and the output-side information, a insulation degradation diagnosis method of performing orientation and display of the partial discharge site based on the received input information and the output-side information,
In the input side slave station or the master station, based on the input side current detection value and time information recorded in the input side current detection value recording means for a certain period, partial discharge due to insulation deterioration of the electrical equipment is performed. A plurality of input-side maximum value information or input-side minimum value information having the characteristics shown,
In the output side slave station or the master station, based on the output side current detection value and time information recorded in the output side current detection value recording means for a certain period, partial discharge due to insulation deterioration of the electrical equipment is performed. A plurality of output-side maximum value information or output-side minimum value information having the characteristics shown,
In the master station, from the input side local maximum value information and the output side local maximum value information, or from the input side local minimum value information and the output side local minimum value information, input side localization time information and output used for localization of the partial discharge location A combination of time information for side orientation is extracted, a combination of the extracted time information for input side orientation and time information for output side orientation, the length of the wiring of the electrical device, and the current propagation speed between both ends of the electrical device The position of the partial discharge location is calculated based on the position of the partial discharge location based on the calculated location of the partial discharge location, and display of the partial discharge location discrimination is displayed on the display means. And

請求項１に係る発明の絶縁劣化診断装置又は請求項２に係る発明の絶縁劣化診断方法によれば、停電させることなく活線状態で電力ケーブルの絶縁劣化を診断することができ、かつ、部分放電箇所が電力ケーブルのどこに存在しているかを特定することができる。
そのため、電力ケーブルの絶縁劣化状態を常時監視することができるとともに、電力ケーブルの交換や修理すべき箇所についての情報を随時得ることができる。 According to the insulation deterioration diagnosis device of the invention according to claim 1 or the insulation deterioration diagnosis method of the invention according to claim 2, it is possible to diagnose insulation deterioration of a power cable in a live line state without causing a power failure, and It is possible to specify where the discharge point exists in the power cable.
Therefore, it is possible to constantly monitor the insulation deterioration state of the power cable, and to obtain information on the replacement or repair of the power cable at any time.

請求項３に係る発明の絶縁劣化診断装置又は請求項４に係る発明の絶縁劣化診断方法によれば、停電させることなく活線状態で電気機器の絶縁劣化を診断することができ、かつ、電気機器のどの辺で部分放電が発生しているかを区別することができる。
そのため、電気機器の絶縁劣化状態を常時監視することができるとともに、電気機器の交換についての情報を随時得ることができる。 According to the insulation deterioration diagnosis device of the invention according to claim 3 or the insulation deterioration diagnosis method of the invention according to claim 4, it is possible to diagnose insulation deterioration of an electrical device in a live line state without causing a power failure, and It can be distinguished on which side of the device the partial discharge occurs.
Therefore, it is possible to constantly monitor the insulation deterioration state of the electric equipment and to obtain information about the replacement of the electric equipment at any time.

絶縁劣化診断装置の概略図。Schematic of an insulation deterioration diagnostic apparatus. 絶縁劣化診断装置における一端側子局のブロック図。The block diagram of the one end side slave station in an insulation degradation diagnostic apparatus. 絶縁劣化診断装置における親局のブロック図。The block diagram of the master station in an insulation degradation diagnostic apparatus. 子局における処理フローを示す図。The figure which shows the processing flow in a sub_station | mobile_unit. 親局における処理フローを示す図。The figure which shows the processing flow in a master station. 特許文献１記載の部分放電判別装置の構成を示すブロック図。The block diagram which shows the structure of the partial discharge discrimination device of patent document 1. FIG.

以下、実施例によって本発明の実施形態を説明する。 Hereinafter, embodiments of the present invention will be described by way of examples.

実施例の絶縁劣化診断装置は、図１にその概略を示すとおり、電力ケーブル４の一端部に設置された一端側子局１と、電力ケーブル４の他端部に設置された他端側子局２と、一端側子局１から送信された一端側情報及び他端側子局２から送信された他端側情報を受信して、絶縁劣化発生の有無判定及び部分放電箇所の位置決定（以下「部分放電箇所の標定」という。）を行い、部分放電箇所の位置を表示する親局３によって構成されている。 As shown schematically in FIG. 1, the insulation deterioration diagnosis apparatus of the embodiment has one end side slave station 1 installed at one end portion of the power cable 4 and the other end side connector installed at the other end portion of the power cable 4. Station 2 and the one end side information transmitted from one end side slave station 1 and the other end side information transmitted from other end side slave station 2 are received, whether or not insulation deterioration has occurred, and the position of the partial discharge location ( (Hereinafter referred to as “partial discharge location standardization”), and the master station 3 displays the position of the partial discharge location.

実施例の絶縁劣化診断装置を構成する一端側子局１は、図２に示すとおり、人工衛星、標準電波送信所、通信基地局等が有する基準時計手段７に基づいて随時時刻補正を行うための時刻同期補正回路８を有する計時手段９と、電力ケーブル４の一端側の遮蔽層に接続されている接地線５における接地線電流を所定時間毎に検出する一端側接地線電流検出手段１０と、一定期間中に一端側接地線電流検出手段１０で検出された一端側接地線電流検出値に基づいて絶縁劣化に伴う部分放電を示す特徴を備えた一端側極大値情報及び一端側極小値情報を複数抽出する一端側子局ＣＰＵ１１と、一端側送受信手段１２と、一端側送受信手段１２から出力された一端側情報を適宜の通信線路２０に送り出すための一端側通信インターフェイス１３を備えている。
そして、通信線路２０に送り出された一端側情報は、親局３で受信できるようになっている。 As shown in FIG. 2, the one-end slave station 1 constituting the insulation deterioration diagnosis apparatus of the embodiment performs time correction as needed based on the reference clock means 7 included in an artificial satellite, a standard radio wave transmitter, a communication base station, or the like. The time synchronization means 9 having the time synchronization correction circuit 8 and the one end side ground line current detection means 10 for detecting the ground line current in the ground line 5 connected to the shielding layer on the one end side of the power cable 4 every predetermined time; One end side maximum value information and one end side minimum value information having a feature indicating partial discharge due to insulation deterioration based on one end side ground line current detection value detected by one end side ground line current detection means 10 during a certain period of time One end side slave CPU 11 for extracting a plurality of signals, one end side transmitting / receiving means 12, and one end side communication interface 13 for sending one end side information output from the one end side transmitting / receiving means 12 to an appropriate communication line 20. There.
The one-end side information sent to the communication line 20 can be received by the master station 3.

計時手段９は、いわゆる標準時に準拠した時間を出力する時計であっても良いし、基準時計手段７によって特定される基準時点に同期させてリセットでき一定期間中にカウントアップ又はカウントダウンするカウンタであっても良い。
計時手段９が時計である場合には標準時に準拠した時間情報が時刻情報となり、計時手段９がカウンタである場合にはそのカウント値が時刻情報となる。 The time measuring means 9 may be a clock that outputs a time conforming to the so-called standard time, or a counter that can be reset in synchronization with the reference time specified by the reference clock means 7 and counts up or down during a certain period. May be.
When the time measuring means 9 is a clock, time information based on the standard time is time information, and when the time measuring means 9 is a counter, the count value is time information.

また、一端側子局ＣＰＵ１１は、０．１マイクロ秒（以下「μｓ」と記載する。）毎に一端側接地線電流検出手段１０による一端側接地線電流検出値を計時手段９から得た時刻情報とともに記録する一端側接地線電流検出値記録手段１４と、０．１μｓ（所定時間）毎に現時点における一端側接地線電流検出値と０．１μｓ前における一端側接地線電流検出値との差分値を演算する一端側接地線電流差分値演算手段１５と、一端側接地線電流差分値演算手段１５で演算された差分値が正から負に変化した時点の０．１μｓ前における一端側接地線電流検出値を時刻情報とともに記録する一端側極大値情報記録手段１６と、上記差分値が負から正に変化した時点の０．１μｓ前における一端側接地線電流検出値を時刻情報とともに記録する一端側極小値情報記録手段１７と、一端側極大値情報記録手段１６から絶縁劣化に伴う部分放電を示す特徴を備えた一端側極大値情報を複数抽出する一端側極大値情報抽出手段１８と、一端側極小値情報記録手段１７から絶縁劣化に伴う部分放電を示す特徴を備えた一端側極小値情報を複数抽出する一端側極小値情報抽出手段１９を備えている。 The one end side slave station CPU 11 obtains the one end side ground line current detection value by the one end side ground line current detecting means 10 from the time measuring means 9 every 0.1 microsecond (hereinafter referred to as “μs”). One end side ground line current detection value recording means 14 for recording together with information, and difference between one end side ground line current detection value at the present time and one end side ground line current detection value at 0.1 μs before every 0.1 μs (predetermined time) One end side ground line current difference value calculating means 15 for calculating the value, and one end side ground line 0.1 μs before the difference value calculated by the one end side ground line current difference value calculating means 15 changes from positive to negative. One end side maximum value information recording means 16 for recording the current detection value together with the time information, and one end for recording the one end side ground line current detection value together with the time information 0.1 μs before the time when the difference value changes from negative to positive. Side pole Small value information recording means 17, one end side maximum value information extracting means 18 for extracting a plurality of one end side maximum value information having a feature indicating partial discharge accompanying insulation deterioration from one end side maximum value information recording means 16, and one end side One-end-side minimum value information extracting means 19 is provided for extracting a plurality of one-end-side minimum value information having a feature indicating partial discharge accompanying insulation deterioration from the minimum-value information recording means 17.

一端側極大値情報抽出手段１８は、電力ケーブル４に印加されている交流の周期毎に一端側極大値情報記録手段１６に記録されているデータ中から、各極大値とその直前に発生した極小値との差である立上り変位電流値が大きい複数の極大値を抽出し、それら複数の極大値とともに各時刻情報及び立上り変位電流値を一端側極大値情報として抽出する手段であり、一端側極小値情報抽出手段１９は、電力ケーブル４に印加されている交流の周期毎に一端側極小値情報記録手段１７に記録されているデータ中から、各極小値とその直前に発生した極大値との差である立下り変位電流値が小さい複数の極小値を抽出し、それら複数の極小値とともに各時刻情報及び立下り変位電流値を一端側極小値情報として抽出する手段である。 The one-end-side maximum value information extracting unit 18 extracts each maximum value and the minimum generated immediately before it from the data recorded in the one-end-side maximum value information recording unit 16 for each AC cycle applied to the power cable 4. It is a means for extracting a plurality of maximum values having a large rising displacement current value that is a difference from the value, and extracting each time information and rising displacement current value together with the plurality of maximum values as one end side maximum value information, and one end side minimum The value information extraction means 19 calculates each minimum value and the maximum value generated immediately before it from the data recorded in the one end side minimum value information recording means 17 for each AC cycle applied to the power cable 4. This is means for extracting a plurality of minimum values having a small falling displacement current value as a difference, and extracting each time information and the falling displacement current value as one end side minimum value information together with the plurality of minimum values.

また、図示はしていないが、一端側子局ＣＰＵ１１は、抽出した複数の極大値とそれぞれの時刻情報及び立上り変位電流値、並びに抽出した複数の極小値とそれぞれの時刻情報及び立上り変位電流値だけでなく、接地線電流の基本波成分実効値、ゼロクロス時刻情報及び子局電源ゼロクロス時刻情報も、一端側情報として一端側送受信手段１２に送り出すことができるようになっている。 Although not shown, the one-end slave station CPU 11 extracts the plurality of maximum values and their respective time information and rising displacement current values, and the plurality of extracted minimum values and their respective time information and rising displacement current values. In addition, the fundamental wave component effective value of the ground line current, the zero cross time information, and the slave station power source zero cross time information can be sent to the one-end-side transmitting / receiving means 12 as one-end-side information.

次に、一端側子局ＣＰＵ１１における処理の詳細について図４を用いて説明する。
（１）子局データ記録処理
親局から送信された相電圧ゼロクロス時刻情報から始まるデータ検出指定時刻情報を受信し、指定されたデータ検出指定時刻以降、０．１μｓ（所定時間）毎に一端側接地線電流検出手段１０で検出された一端側接地線電流検出値を計時手段９から得た時刻情報とともに記録する。 Next, details of the processing in the one-end slave station CPU 11 will be described with reference to FIG.
(1) Slave station data recording process Receives data detection specified time information starting from phase voltage zero crossing time information transmitted from the master station, and ends one side every 0.1 μs (predetermined time) after the specified data detection specified time The one end side ground line current detection value detected by the ground line current detection means 10 is recorded together with the time information obtained from the time measuring means 9.

（２）極大・極小値データ抽出処理
データ検出指定時刻直後における交流の１周期分（５０ヘルツの場合２０ミリ秒）の一端側接地線電流検出値から極大・極小値データを抽出する。 (2) Maximum / Minimum Value Data Extraction Processing Maximum / minimum value data is extracted from the one end side ground line current detection value for one AC period (20 milliseconds for 50 Hz) immediately after the data detection designated time.

（３）コロナ放電等時刻情報抽出処理
部分放電のうちのコロナ放電、沿面放電及び零相劣化漏れ電流の特徴を示す立上りが急峻で立上り変位電流が一定値以上の大きさの波形のうち、振幅が大きいものを最大４０波抽出し、それぞれの立上り変曲点代表時刻情報を抽出する。 (3) Time information extraction processing such as corona discharge The amplitude of a waveform having a steep rise and a rising displacement current greater than a certain value indicating the characteristics of corona discharge, creeping discharge, and zero-phase deterioration leakage current among partial discharges. The maximum 40 waves are extracted, and the representative inflection point time information is extracted.

（４）内部放電時刻情報抽出処理
部分放電のうちの内部放電の特徴を示す立下りが急峻で立下り変位電流が一定値以下の大きさの波形のうち、振幅が大きいものを最大４０波抽出し、それぞれの立下り変曲点代表時刻情報を抽出する。 (4) Internal discharge time information extraction processing Up to 40 waveforms with a large amplitude are extracted from the waveforms of the steep falling and the falling displacement current below a certain value indicating the characteristics of the internal discharge among the partial discharges. Each inflection point representative time information is extracted.

（５）一端側情報送信処理
一端側情報、すなわち（３）の処理で抽出した立上り変曲点代表時刻情報、極大電流値及び立上り変位電流値（部分放電を示す特徴を備えた一端側極大値情報）の最大４０点分、（４）の処理で抽出した立下り変曲点代表時刻情報、極小電流値及び立下り変位電流値（部分放電を示す特徴を備えた一端側極小値情報）の最大４０点分、接地線電流の基本波成分実効値、ゼロクロス時刻情報及び子局電源ゼロクロス時刻情報を親局へ送信する。 (5) One-end-side information transmission processing One-end-side information, that is, the rising inflection point representative time information extracted by the processing of (3), the maximum current value, and the rising displacement current value (one-end-side maximum value having characteristics indicating partial discharge) Information) for a maximum of 40 points, the falling inflection point representative time information extracted by the processing of (4), the minimum current value and the falling displacement current value (one-end side minimum value information having characteristics indicating partial discharge). For up to 40 points, the fundamental wave component effective value of ground line current, zero cross time information and slave station power source zero cross time information are transmitted to the master station.

実施例の絶縁劣化診断装置を構成する他端側子局２は、電力ケーブル４の他端側の遮蔽層に接続されている接地線６における接地線電流を所定時間毎に検出し、他端側情報を親局に送信するものであって、その構成は一端側か他端側かが異なる以外は、一端側子局１と全く同じである。 The other end side slave station 2 constituting the insulation deterioration diagnosis device of the embodiment detects the ground line current in the ground line 6 connected to the shielding layer on the other end side of the power cable 4 at every predetermined time, and the other end The side information is transmitted to the master station, and the configuration is exactly the same as that of the one-end slave station 1 except that one end side or the other end side is different.

実施例の絶縁劣化診断装置を構成する親局３は、図３に示すとおり、適宜の通信線路２０から一端側情報及び他端側情報を取り込むための通信インターフェイス２１と、一端側子局１から送信された一端側情報及び他端側子局２から送信された他端側情報を受信するとともにデータ検出指定時刻情報を送信する送受信手段２２と、受信した一端側情報及び他端側情報に基づいて、部分放電箇所の位置を計算する処理を行う親局ＣＰＵ２３と、計算された部分放電箇所の位置を表示する表示手段２４を備えている。 As shown in FIG. 3, the master station 3 constituting the insulation deterioration diagnosis apparatus of the embodiment includes a communication interface 21 for capturing one end side information and other end side information from an appropriate communication line 20, and one end side slave station 1. Based on the transmitted one end side information and the other end side information transmitted from the other end side slave station 2 and transmitting / receiving means 22 for transmitting data detection designation time information, and the received one end side information and the other end side information. Thus, a master station CPU 23 for performing processing for calculating the position of the partial discharge location and a display means 24 for displaying the calculated location of the partial discharge location are provided.

親局３が備える親局ＣＰＵ２３は、受信した一端側情報及び他端側情報から、部分放電箇所の標定に用いる複数対の一端側極大値発生時刻情報と他端側極大値発生時刻情報の組み合わせ、又は複数対の一端側極小値発生時刻情報と他端側極小値発生時刻情報の組み合わせ（以下「標定用時刻情報」という。）を抽出する標定用時刻情報抽出手段２５と、抽出された標定用時刻情報、電力ケーブル４の両端間の距離及び電流伝搬速度に基づいて部分放電箇所の位置を計算する部分放電位置計算手段２６、計算された部分放電箇所の位置を表示処理する部分放電位置表示処理手段２７及び電力ケーブル４の両端間の距離や電流伝搬速度を記憶する電力ケーブル情報記憶手段２８を備え、表示指示情報を表示手段２４に出力するものである。 Based on the received one end side information and the other end side information, the master station CPU 23 provided in the master station 3 combines a plurality of pairs of one end side maximum value generation time information and the other end side maximum value generation time information to be used for location of the partial discharge location. Or a plurality of pairs of one end side minimum value occurrence time information and the other end side minimum value occurrence time information (hereinafter, referred to as “orientation time information”), and a standardization time information extraction unit 25 for extracting Partial discharge position calculating means 26 for calculating the position of the partial discharge location based on the time information for use, the distance between both ends of the power cable 4 and the current propagation velocity, and the partial discharge position display for displaying the calculated partial discharge location Power cable information storage means 28 for storing the distance between both ends of the processing means 27 and the power cable 4 and the current propagation speed is provided, and display instruction information is output to the display means 24.

親局ＣＰＵ２３による部分放電箇所の標定について説明する。
部分放電箇所の標定は、一端側子局１及び他端側子局２から対になる極大値情報又は極小値情報が送信された場合に実施され、部分放電箇所の位置計算を行う。
なお、対になる極大値情報又は極小値情報とは、電力ケーブル４に印加されている交流の同一半周期内に発生している一端側子局１からの極大値情報と他端側子局２からの極大値情報又は一端側子局１からの極小値情報と他端側子局２からの極小値情報のことである。 The location of the partial discharge location by the master station CPU 23 will be described.
The location of the partial discharge location is carried out when local maximum value information or local minimum value information is transmitted from the one end side slave station 1 and the other end side slave station 2 to calculate the position of the partial discharge location.
The maximum value information or the minimum value information to be paired is the maximum value information from the one-end side slave station 1 and the other-end side slave station that are generated within the same half cycle of the AC applied to the power cable 4. The local maximum value information from 2 or the local minimum value information from the one end side slave station 1 and the local minimum value information from the other end side slave station 2.

部分放電箇所の位置を計算する手順について図５を用いて説明する。
（１）抽出データ受信処理
一端側子局１で抽出された一端側情報及び他端側子局２で抽出された他端側情報を受信する。
（２）伝搬許容時間算定処理
一端側子局１及び他端側子局２間の距離を、電力ケーブル４の両端間の電流伝搬速度で除して伝搬許容時間を求める。
一端側子局１からの立上り変曲点代表時刻情報と他端側子局２からの立上り変曲点代表時刻情報の時刻差が伝搬許容時間を超過していれば、同一箇所で発生している部分放電に起因するものではないと判定できる。
同様に、一端側子局１からの立下り変曲点代表時刻情報と他端側子局２からの立下り変曲点代表時刻情報の時刻差が伝搬許容時間を超過していれば、同一箇所で発生している部分放電に起因するものではないと判定できる。
（３）コロナ放電等時刻組合せ算定処理
一端側子局１からの立上り変曲点代表時刻情報と他端側子局２からの立上り変曲点代表時刻情報の組み合わせのうち、時刻差が（２）で求めた伝搬許容時間以下の組み合わせペア（コロナ放電等発生箇所の標定に用いる一端側標定用時刻情報と他端側標定用時刻情報の組み合わせ）を抽出する。
そして、全ての組み合わせペアについて、部分放電箇所の位置を計算する。
その計算式は、一端側子局１からの立上り変曲点代表時刻情報をＴ1、他端側子局２からの立上り変曲点代表時刻情報をＴ2、電力ケーブル４の両端間の距離をＬ12、電力ケーブル４の両端間の電流伝搬速度をｖ、一端側子局１から部分放電箇所までの距離Ｌｘとしたとき、以下のとおりである。
Ｌｘ＝{ｖ×(Ｔ1−Ｔ2)＋Ｌ12}÷２
（４）内部放電時刻組合せ算定処理
一端側子局１からの立下り変曲点代表時刻情報と他端側子局２からの立下り変曲点代表時刻情報の組み合わせのうち、時刻差が（２）で求めた伝搬許容時間以下の組み合わせペア（内部放電発生箇所の標定に用いる一端側標定用時刻情報と他端側標定用時刻情報の組み合わせ）を抽出する。
そして、全ての組み合わせペアについて、（３）と同じ計算式を用いて部分放電箇所の位置を計算する。 The procedure for calculating the position of the partial discharge location will be described with reference to FIG.
(1) Extracted data reception processing One end side information extracted by the one end side slave station 1 and the other end side information extracted by the other end side slave station 2 are received.
(2) Propagation Allowable Time Calculation Processing The allowable propagation time is obtained by dividing the distance between the one end side slave station 1 and the other end side slave station 2 by the current propagation speed between both ends of the power cable 4.
If the time difference between the rising inflection point representative time information from the one end side slave station 1 and the rising inflection point representative time information from the other end side slave station 2 exceeds the allowable propagation time, it occurs at the same location. It can be determined that it is not caused by the partial discharge.
Similarly, if the time difference between the falling inflection point representative time information from the one end side slave station 1 and the falling inflection point representative time information from the other end side slave station 2 exceeds the allowable propagation time, the same It can be determined that it is not caused by the partial discharge occurring at the location.
(3) Time combination calculation processing such as corona discharge Among the combinations of the rising inflection point representative time information from the one end side slave station 1 and the rising inflection point representative time information from the other end side slave station 2, the time difference is (2 The combination pair (the combination of the one end side positioning time information and the other end side positioning time information used for the location determination of the occurrence location such as corona discharge) is extracted.
And the position of the partial discharge location is calculated about all the combination pairs.
The calculation formula is that the rising inflection point representative time information from one end side slave station 1 is T1, the rising inflection point representative time information from the other end side slave station 2 is T2, and the distance between both ends of the power cable 4 is L12. When the current propagation speed between both ends of the power cable 4 is v and the distance Lx from the one-end side slave station 1 to the partial discharge location is as follows.
Lx = {v × (T1−T2) + L12} ÷ 2
(4) Internal Discharge Time Combination Calculation Processing Among the combinations of the falling inflection point representative time information from the one end side slave station 1 and the falling inflection point representative time information from the other end side slave station 2, the time difference is ( A combination pair (combination of one end-side orientation time information and the other end-side orientation time information used for location of the internal discharge occurrence location) equal to or shorter than the propagation allowable time obtained in 2) is extracted.
And the position of a partial discharge location is calculated about all the combination pairs using the same calculation formula as (3).

このような手順によって各組み合わせペアについて、部分放電箇所の位置を計算した後、部分放電位置表示処理手段２７によって表示処理を行い部分放電箇所の位置に関する表示指示情報を出力する。
表示指示情報としては、一端側子局１又は他端側子局２から部分放電箇所までの距離情報やケーブル配置図中における場所を示す情報等どのような情報でも良い。
そして、表示手段２４には、部分放電位置表示処理手段２７から出力された表示指示情報に応じた情報が表示される。 After calculating the position of the partial discharge location for each combination pair by such a procedure, display processing is performed by the partial discharge position display processing means 27 and display instruction information regarding the position of the partial discharge location is output.
The display instruction information may be any information such as distance information from the one-end-side slave station 1 or the other-end-side slave station 2 to the partial discharge location, or information indicating a location in the cable layout.
The display unit 24 displays information corresponding to the display instruction information output from the partial discharge position display processing unit 27.

実施例の絶縁劣化診断装置に関する変形例を列記する。
（１）実施例の親局３は一端側子局１又は他端側子局２を兼ねていても良い。
すなわち、一端側子局１又は他端側子局２のいずれかに親局機能を持たせても良い。
（２）実施例の一端側子局１は、電力ケーブル４の一端側の遮蔽層に接続されている接地線５における接地線電流を検出する一端側接地線電流検出手段１０を備え、他端側子局２も、同様の他端側接地線電流検出手段を備えているが、一端側接地線電流検出手段及び他端側接地線電流検出手段に代えて、それぞれ一端側及び他端側における零相電流を検出する一端側零相電流検出手段及び他端側零相電流検出手段としても良い。
そうした場合、接地線電流検出値記録手段及び接地線電流差分値演算手段は、それぞれ零相電流検出値記録手段及び零相電流差分値演算手段に置き換わることとなるが、一端側子局ＣＰＵ１１における処理フローは、接地線電流を検出する場合と同じである。
（３）実施例においては、電力ケーブル４の一端部に一端側子局１、他端部に他端側子局２を設置しているが、電力ケーブル４を変圧器やモーター等の電気機器に代え、その入力側の配線に入力側子局、出力側の配線に出力側子局を設置するとともに、入力側子局に入力側配線における零相電流を検出する入力側電流検出手段、入力側子局ＣＰＵ、入力側送信手段及び入力側通信インターフェイスを設置し、出力側子局に接地線電流を検出する出力側電流検出手段、出力側子局ＣＰＵ、出力側送信手段及び出力側通信インターフェイスを設置して、その電気機器のどの辺で部分放電が発生しているかを区別することができるようにしても良い。
そうした場合、入力側子局ＣＰＵの各構成は、一端側子局ＣＰＵ１１の各構成における「一端側」を「入力側」に代えたものとなり、出力側子局ＣＰＵの各構成は他端側子局ＣＰＵの各構成における「他端側」を「出力側」に代えたものとなり、部分放電箇所の位置計算に用いる電力ケーブル４の両端間の距離は電気機器の配線の長さに代えることとなる。
（４）実施例の一端側接地線電流検出値記録手段１４及び他端側接地線電流検出値記録手段は、０．１μｓ毎に一端側接地線電流検出値、他端側接地線電流検出値及び時刻情報を記録しているが、標定精度に応じて記録する時間間隔は変更することができる。
すなわち、０．１μｓ毎の場合の標定精度は数ｍ程度であるから、標定精度を上げたければ記録する時間間隔を短くすることが必要となる。
（５）実施例の一端側接地線電流差分値演算手段１５、一端側極大値情報記録手段１６、一端側極小値情報記録手段１７、一端側極大値情報抽出手段１８及び一端側極小値情報抽出手段１９は、一端側子局１に備えられているが、一端側接地線電流検出値記録手段１４のデータを親局３に送信し、親局３に一端側接地線電流差分値演算手段１５、一端側極大値情報記録手段１６、一端側極小値情報記録手段１７、一端側極大値情報抽出手段１８及び一端側極小値情報抽出手段１９を備えるようにしても良い。
また、一端側極大値情報記録手段１６及び一端側極小値情報記録手段１７のデータを親局３に送信し、親局３に一端側極大値情報抽出手段１８及び一端側極小値情報抽出手段１９を備えるようにしても良い。
なお、他端側子局２と親局３との間においても同様の変形が可能である。
（６）実施例においては、部分放電発生の有無判定と部分放電箇所の位置決定を行っているが、絶縁劣化の進行度合いの判定も行うことができる。
すなわち、絶縁劣化の初期段階（小さなボイドが発生している段階）においては、複数回の比較的小さな部分放電が繰り返され、絶縁劣化が進むにつれて部分放電の回数が減るとともに大きな波高値の放電電流が流れるようになるので、例えば、一端側接地線電流検出値又は他端側接地線電流検出値の絶対値が小さい場合には初期段階、大きい場合には後期段階と判定し、１周期中に極大値又は極小値発生時刻情報が３回抽出されている時は絶縁劣化の初期段階、２回抽出されている時は中期段階、１回抽出されている時は後期段階と判定することができる。
（７）実施例においては、部分放電発生の有無判定と部分放電箇所の位置決定を行っているが、電力ケーブルの端部近辺における遮蔽銅テープの破断の有無を判定することもできる。
すなわち、一端側接地線電流と他端側接地線電流の大きさに明確な差がある場合、接地線電流値の小さい方の端部近辺で遮蔽銅テープの破断が発生しており、接地線電流値の大きい方の端部近辺では遮蔽銅テープの破断が発生していないと判定することができる。
（８）実施例の図４及び図５の説明では、コロナ放電等時刻情報抽出処理と内部放電時刻情報抽出処理の両方を行い、コロナ放電等時刻組合せ算定処理と内部放電時刻組合せ算定処理も両方行っているが、いずれか一方の処理だけを行うようにしても良い。 The modification regarding the insulation deterioration diagnostic apparatus of an Example is listed.
(1) The master station 3 of the embodiment may also serve as the one end side slave station 1 or the other end side slave station 2.
That is, either the one-end-side slave station 1 or the other-end-side slave station 2 may have a master station function.
(2) The one end side slave station 1 of the embodiment includes one end side ground line current detecting means 10 for detecting the ground line current in the ground line 5 connected to the shielding layer on one end side of the power cable 4 and the other end. The side slave station 2 is also provided with a similar other end side ground line current detecting means, but instead of the one end side ground line current detecting means and the other end side ground line current detecting means, respectively, at the one end side and the other end side. One-end-side zero-phase current detecting means for detecting zero-phase current and other-end-side zero-phase current detecting means may be used.
In such a case, the ground line current detection value recording means and the ground line current difference value calculation means are replaced with the zero phase current detection value recording means and the zero phase current difference value calculation means, respectively. The flow is the same as when detecting the ground line current.
(3) In the embodiment, the one end side slave station 1 is installed at one end of the power cable 4 and the other end side slave station 2 is installed at the other end, but the power cable 4 is connected to an electric device such as a transformer or a motor. Instead of the input side slave station in the input side wiring, the output side slave station in the output side wiring, and the input side current detection means for detecting the zero-phase current in the input side wiring in the input side slave station, the input Side slave station CPU, input side transmission means and input side communication interface are installed, output side current detection means for detecting ground line current at the output side slave station, output side slave station CPU, output side transmission means and output side communication interface May be installed so that it can be distinguished on which side of the electrical device the partial discharge is generated.
In such a case, each configuration of the input side slave station CPU is obtained by replacing “one end side” in each configuration of the one end side slave station CPU 11 with “input side”, and each configuration of the output side slave station CPU is the other end side slave CPU. The “other end side” in each configuration of the station CPU is changed to the “output side”, and the distance between both ends of the power cable 4 used for calculating the position of the partial discharge location is changed to the length of the wiring of the electric device. Become.
(4) The one end side ground line current detection value recording means 14 and the other end side ground line current detection value recording means of the embodiment have one end side ground line current detection value and the other end side ground line current detection value every 0.1 μs. Although the time information is recorded, the recording time interval can be changed according to the orientation accuracy.
That is, since the orientation accuracy in every 0.1 μs is about several meters, if the orientation accuracy is to be increased, it is necessary to shorten the recording time interval.
(5) One end side ground line current difference value calculation means 15, one end side maximum value information recording means 16, one end side minimum value information recording means 17, one end side maximum value information extraction means 18, and one end side minimum value information extraction The means 19 is provided in the one end side slave station 1, but transmits the data of the one end side ground line current detection value recording means 14 to the master station 3, and sends one end side ground line current difference value calculation means 15 to the master station 3. One end side maximum value information recording means 16, one end side minimum value information recording means 17, one end side maximum value information extracting means 18, and one end side minimum value information extracting means 19 may be provided.
Further, the data of the one end side maximum value information recording means 16 and the one end side minimum value information recording means 17 are transmitted to the master station 3, and the one end side maximum value information extracting means 18 and the one end side minimum value information extracting means 19 are transmitted to the master station 3. You may make it provide.
The same modification can be made between the other end side slave station 2 and the master station 3.
(6) In the embodiment, the presence / absence determination of the occurrence of partial discharge and the position determination of the partial discharge location are performed.
That is, in the initial stage of insulation deterioration (stage where small voids are generated), a plurality of relatively small partial discharges are repeated, and the number of partial discharges decreases as the insulation deterioration progresses, and the discharge current has a large peak value. For example, when the absolute value of the one end side ground line current detection value or the other end side ground line current detection value is small, the initial stage is determined, and when the absolute value is large, the latter stage is determined. When the maximum or minimum occurrence time information is extracted three times, it can be determined as an initial stage of insulation deterioration, when extracted twice, an intermediate stage, and when extracted, it can be determined as a later stage. .
(7) In the embodiment, the presence / absence determination of the occurrence of partial discharge and the position determination of the partial discharge location are performed, but the presence / absence of breakage of the shielding copper tape in the vicinity of the end of the power cable can also be determined.
That is, when there is a clear difference between the ground wire current at one end and the ground wire current at the other end, the shielding copper tape is broken near the end of the smaller ground wire current value. It can be determined that the shielding copper tape is not broken in the vicinity of the end portion having the larger current value.
(8) In the description of FIG. 4 and FIG. 5 of the embodiment, both the corona discharge time information extraction process and the internal discharge time information extraction process are performed, and both the corona discharge time combination calculation process and the internal discharge time combination calculation process are performed. However, only one of the processes may be performed.

１一端側子局２他端側子局３親局
４電力ケーブル５、６接地線７基準時計手段
８時刻同期補正回路９計時手段
１０一端側接地線電流検出手段１１一端側子局ＣＰＵ
１２一端側送受信手段１３一端側通信インターフェイス
１４一端側接地線電流検出値記録手段
１５一端側接地線電流差分値演算手段
１６一端側極大値情報記録手段１７一端側極小値情報記録手段
１８一端側極大値情報抽出手段１９一端側極小値情報抽出手段
２０通信線路２１通信インターフェイス
２２送受信手段２３親局ＣＰＵ２４表示手段
２５標定用時刻情報抽出手段２６部分放電位置計算手段
２７部分放電位置表示処理手段２８電力ケーブル情報記憶手段 DESCRIPTION OF SYMBOLS 1 One end side slave station 2 Other end side slave station 3 Master station 4 Power cable 5, 6 Ground line 7 Reference clock means 8 Time synchronization correction circuit 9 Time measuring means 10 One end side ground line current detection means 11 One end side slave station CPU
12 one end side transmission / reception means 13 one end side communication interface 14 one end side ground line current detection value recording means 15 one end side ground line current difference value calculation means 16 one end side maximum value information recording means 17 one end side minimum value information recording means 18 one end side maximum Value information extraction means 19 One end side minimum value information extraction means 20 Communication line 21 Communication interface 22 Transmission / reception means 23 Master station CPU 24 Display means 25 Positioning time information extraction means 26 Partial discharge position calculation means 27 Partial discharge position display processing means 28 Power Cable information storage means

Claims

One end side current detection means for detecting a ground line current or zero phase current at one end side of the power cable, and one end side current detection value detected by the one end side current detection means every predetermined time are synchronized with the reference clock means. One end provided with at least one end side current detection value recording means for recording together with time information obtained from the time measuring means capable of transmitting, and one end side transmitting / receiving means for transmitting one end side information to the master station and receiving data detection designated time information Side slave station,
The other end side current detection means for detecting the ground line current or zero phase current at the other end side of the power cable, and the other end side current detection value detected by the other end side current detection means every predetermined time as the reference The other end side current detection value recording means for recording together with the time information obtained from the timing means that can be synchronized with the clock means, and the other end side information is transmitted to the master station and the data detection designated time information is received. The other end side slave station comprising at least the other end side transmitting / receiving means,
Transmission / reception means for receiving the one end side information and the other end side information and transmitting data detection designation time information, and localization of the partial discharge location based on the one end side information and the other end side information received by the transmission / reception means And an insulation deterioration diagnosis device having the master station including at least a partial discharge location locating means for displaying,
The one-end-side slave station or the master station performs partial discharge accompanying insulation degradation of the power cable based on the one-end-side current detection value and time information recorded in the one-end-side current detection value recording means during a certain period. Means for extracting a plurality of one-end-side maximum value information or one-end-side minimum value information having the characteristics shown;
The other end side slave station or the master station is accompanied by insulation deterioration of the power cable based on the other end side current detection value and time information recorded in the other end side current detection value recording means during a certain period. Means for extracting a plurality of other-end-side local maximum value information or other-end-side local minimum value information having characteristics indicating partial discharge;
The partial discharge location locating means is
From the one end side maximum value information and the other end side maximum value information, or from the one end side minimum value information and the other end side minimum value information, one end side determination time information and other end side determination used for the determination of the partial discharge location. Orientation time information extracting means for extracting a combination of time information,
Based on the combination of the one end side orientation time information and the other end side orientation time information extracted by the orientation time information extracting means, the distance between both ends of the power cable, and the current propagation speed between both ends of the power cable. Partial discharge position calculating means for calculating the position of the partial discharge location,
Display processing means for performing display processing on the position of the partial discharge location based on the calculation result by the partial discharge position calculation means;
An insulation deterioration diagnosis apparatus comprising display means for displaying a position of the partial discharge portion.

In the one end side slave station installed on one end side of the power cable, the one end side current detection value detected every one predetermined time by the one end side current detecting means for detecting the ground line current or the zero phase current on the one end side is used as a reference clock. Recorded in the one-end-side current detection value recording means together with time information obtained from the timing means that can be synchronized with the means, and transmits one-end-side information to the master station,
In the other end side slave station installed on the other end side of the power cable, the other end side current detected every predetermined time by the other end side current detecting means for detecting the ground line current or the zero-phase current on the other end side. The detected value is recorded in the other end side current detection value recording means together with the time information obtained from the time measuring means that can be synchronized with the reference clock means, and the other end side information is transmitted to the master station,
In the master station, the one end side information and the other end side information transmitted from the one end side slave station and the other end side slave station are received, and based on the received one end side information and the other end side information. An insulation deterioration diagnosis method for locating and displaying partial discharge locations,
In the one end side slave station or the master station, based on the one end side current detection value and time information recorded in the one end side current detection value recording means, partial discharge due to insulation deterioration of the power cable is performed. One end side maximum value information or one end side minimum value information having features to be extracted,
In the other end side slave station or the master station, with the insulation deterioration of the power cable based on the other end side current detection value and time information recorded in the other end side current detection value recording means during a certain period. Extracting a plurality of other end side maximum value information or other end side minimum value information having features indicating partial discharge,
In the master station,
From the one end side maximum value information and the other end side maximum value information, or from the one end side minimum value information and the other end side minimum value information, one end side determination time information and other end side determination used for the determination of the partial discharge location. Extract the time information combination,
The position of the partial discharge location is calculated based on the combination of the extracted one-side location time information and the other-end location time information, the distance between both ends of the power cable, and the current propagation speed between both ends of the power cable. And
Based on the calculated position of the partial discharge location, display processing related to the location of the partial discharge location,
An insulation deterioration diagnosis method, wherein the position of the partial discharge location is displayed on a display means.

It is possible to synchronize the input side current detection means for detecting the zero-phase current in the input side wiring of the electrical equipment and the input side current detection value detected by the input side current detection means at a predetermined time with the reference clock means. Input side slave station comprising at least input side current detection value recording means for recording together with time information obtained from the time measuring means, and input side transmission / reception means for transmitting input side information to the master station and receiving data detection designated time information When,
Output-side current detection means for detecting the ground line current of the electrical equipment, and timing means capable of synchronizing the output-side current detection value detected every predetermined time by the output-side current detection means with the reference clock means Output-side current detection value recording means for recording together with the time information obtained from the output-side slave station comprising at least output-side transmission / reception means for transmitting the output-side information to the master station and receiving the data detection designated time information; ,
Transmission / reception means for receiving the input side information and the output side information and transmitting data detection designation time information, and localization and display of partial discharge locations based on the input side information and the output side information received by the transmission / reception means An insulation deterioration diagnostic apparatus having the master station including at least a partial discharge location locating means for performing
The input side slave station or the master station performs partial discharge due to insulation deterioration of the electrical equipment based on the input side current detection value and time information recorded in the input side current detection value recording means during a certain period. Further comprising means for extracting a plurality of input side maximum value information or input side minimum value information having the characteristics shown,
The output side slave station or the master station performs partial discharge accompanying insulation deterioration of the electrical device based on the output side current detection value and time information during a certain period recorded in the output side current detection value recording means. Further comprising means for extracting a plurality of output-side local maximum value information or output-side local minimum value information having the characteristics shown,
The partial discharge location locating means is
From the input side maximum value information and the output side maximum value information, or from the input side minimum value information and the output side minimum value information, input side localization time information and output side localization time information used for localization of the partial discharge location Orientation time information extracting means for extracting a combination of
Based on the combination of the input side orientation time information and the output side orientation time information extracted by the orientation time information extraction means, the wiring length of the electrical device, and the current propagation speed between both ends of the electrical device A partial discharge position calculating means for calculating the position of the partial discharge location;
Display processing means for performing display processing relating to the discrimination of the partial discharge locations based on the calculation result by the partial discharge position calculation means;
An insulation deterioration diagnosis apparatus, comprising: a display unit that displays the distinction between the partial discharge locations.

In the input side slave station installed on the input side of the electrical equipment, the input side current detection value detected every predetermined time by the input side current detection means for detecting the zero-phase current in the input side wiring is synchronized with the reference clock means. Recorded in the input side current detection value recording means together with the time information obtained from the timing means capable of being sent, and transmitting the input side information to the master station,
In the output side slave station installed on the output side of the electrical equipment, the output side current detection value detected every predetermined time by the output side current detection means for detecting the ground line current is synchronized with the reference clock means. Is recorded in the output current detection value recording means together with the time information obtained from the time measuring means capable of transmitting the output side information to the master station,
In the master station, the input side information and the output side information transmitted from the input side slave station and the output side slave station are received, and a partial discharge location is based on the received input side information and output side information. An insulation deterioration diagnosis method for locating and displaying
In the input side slave station or the master station, based on the input side current detection value and time information recorded in the input side current detection value recording means for a certain period, partial discharge due to insulation deterioration of the electrical equipment is performed. A plurality of input-side maximum value information or input-side minimum value information having the characteristics shown,
In the output side slave station or the master station, based on the output side current detection value and time information recorded in the output side current detection value recording means for a certain period, partial discharge due to insulation deterioration of the electrical equipment is performed. A plurality of output-side maximum value information or output-side minimum value information having the characteristics shown,
In the master station,
From the input side maximum value information and the output side maximum value information, or from the input side minimum value information and the output side minimum value information, input side localization time information and output side localization time information used for localization of the partial discharge location Extract a combination of
The position of the partial discharge location is calculated based on the combination of the extracted time information for input side orientation and time information for output side orientation, the length of the wiring of the electrical equipment, and the current propagation speed between both ends of the electrical equipment. ,
Based on the calculated position of the partial discharge location, display processing related to the differentiation of the partial discharge location,
The insulation deterioration diagnosis method, wherein the distinction between the partial discharge locations is displayed on a display means.