JP6116499B2 - Circuit breaker - Google Patents
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- JP6116499B2 JP6116499B2 JP2014037771A JP2014037771A JP6116499B2 JP 6116499 B2 JP6116499 B2 JP 6116499B2 JP 2014037771 A JP2014037771 A JP 2014037771A JP 2014037771 A JP2014037771 A JP 2014037771A JP 6116499 B2 JP6116499 B2 JP 6116499B2
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- 238000005259 measurement Methods 0.000 claims description 42
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Description
この発明は、極数より少ない相数の電路に電源および負荷が接続され、前記接続がされる相のうちの一相と前記接続がされない相とが電線で短絡される３極以上の回路遮断器に関するものである。 In the present invention, a power supply and a load are connected to an electric circuit having a number of phases smaller than the number of poles, and one phase of the phases to be connected and a phase to which the connections are not made are short-circuited by an electric wire. It is about a vessel.
前記の回路遮断器は、例えば負荷電流、線間電圧、電力、電力量および力率等の電気量を計測し、表示および通信等により外部出力するものが知られており、例えば３極品の回路遮断器では、線間電圧を測定するために１−２相間および２−３相間に変圧器が設置される。
また、各相電流を測定するために１相、２相および３相の各々に変流器が設置される。（例えば、特許文献１参照）。
The circuit breaker is known to measure the amount of electricity such as load current, line voltage, electric power, electric energy and power factor, and to output it externally by display, communication, etc. In the circuit breaker, a transformer is installed between the 1-2 phase and the 2-3 phase in order to measure the line voltage.
Moreover, in order to measure each phase electric current, a current transformer is installed in each of 1 phase, 2 phase, and 3 phase. (For example, refer to Patent Document 1).
前記回路遮断器が設置される電路は、例えば３極品の場合、三相３線式、単相３線式および単相２線式等がある。
前記において、単相２線式では、１相−２相間に負荷を接続する場合は２相−３相間を短絡、または２相−３相間に負荷を接続する場合は１相−２相間を電線５で短絡して使用する必要がある。（図４参照）。
これは、回路遮断器に内蔵された変圧器を介して、負荷を接続しない相に電圧が生じるので、その電圧による感電防止、および不要な計測値発生を防止するためである。
For example, when the circuit breaker is installed in a three-pole product, there are a three-phase three-wire system, a single-phase three-wire system, a single-phase two-wire system, and the like.
In the above, in the single-phase two-wire system, when connecting a load between one phase and two phases, a short circuit between two and three phases, or when connecting a load between two and three phases, an electric wire between one and two phases 5 needs to be short-circuited. (See FIG. 4).
This is because a voltage is generated in a phase not connected to a load through a transformer built in the circuit breaker, so that an electric shock due to the voltage and generation of an unnecessary measurement value are prevented.
一方、前記短絡に使用する電線は、電流が流れないため、許容電流の小さな電線が使用される場合がある。
前記において、例えば１相−２相間に負荷を接続、２相−３相間を短絡する使用方法において、誤って１相−３相間に負荷を接続した場合、許容電流の小さい２相−３相間短絡用の電線に負荷電流が流れ、電線が焼損するという問題があった。
On the other hand, since the electric current used for the short circuit does not flow, an electric wire with a small allowable current may be used.
In the above, for example, in a method of connecting a load between 1 phase and 2 phase and shorting between 2 phase and 3 phase, if a load is accidentally connected between 1 phase and 3 phase, short circuit between 2 phase and 3 phase with a small allowable current There was a problem that a load current flowed in the electric wire and the wire was burned out.
この発明は、上述のような課題を解決するためになされたもので、極数より少ない相数の電路に電源および負荷が接続される相のうちの一相と前記接続がされない相とを相間短絡する電線を保護することを目的とするものである。 The present invention has been made to solve the above-described problems, and a phase between a phase in which a power source and a load are connected to an electric circuit having a number of phases smaller than the number of poles and a phase in which the connection is not made are interphased. It aims at protecting the electric wire which short-circuits.
この発明に係る回路遮断器は、極数より少ない相数の電路に電源および負荷が接続され、前記接続がされる相のうちの一相と前記接続がされない相とが電線で短絡される３極以上の回路遮断器であって、各相の電流を計測する計測回路を有し前記接続がされない相の電流を前記計測回路が計測するとトリップ動作して前記電線に流れる負荷電流を遮断するものである。 In the circuit breaker according to the present invention, a power source and a load are connected to an electric circuit having a number of phases smaller than the number of poles, and one of the phases to be connected and the phase not to be connected are short-circuited by an electric wire 3 A circuit breaker with more than poles, having a measurement circuit for measuring the current of each phase, and tripping when the measurement circuit measures the current of the phase that is not connected, and shuts off the load current flowing through the wire It is.
この発明は、極数より少ない相数の電路に電源および負荷が接続され、前記接続がされる相のうちの一相と前記接続がされない相とが電線で短絡される３極以上の回路遮断器で
あって、各相の電流を計測する計測回路を有し前記接続がされない相の電流を前記計測回路が計測するとトリップ動作して前記電線に流れる負荷電流を遮断するので、相間短絡用の前記電線を保護することができる。
In the present invention, a power supply and a load are connected to an electric circuit having a number of phases smaller than the number of poles, and one phase of the phases to be connected and a phase to which the connections are not made are short-circuited by an electric wire. A measuring circuit for measuring the current of each phase, and when the measuring circuit measures the current of the phase that is not connected, the trip operation is performed and the load current flowing through the wire is interrupted. The electric wire can be protected.
実施の形態１．
以下この発明の実施の形態１を図１〜３図により説明する。図１は回路遮断器の構成の一例を示すブロック図、図２は動作を説明するためのフローチャート、図３は３極の回路遮断器を単相２線で使用する場合の結線例を示す平面図である。
図１において、回路遮断器１００は、交流電路１を開閉する開閉接点２と、交流電路１の１相に挿入された変流器３ａ、２相に挿入された変流器３ｂおよび３相に挿入された変流器３ｃを有する変流器３と、交流電路１の１−２相間に挿入された変圧器４ａおよび２−３相間に挿入された変圧器４ｂを有する変圧器４と、変流器３の検出信号に基づいて過電流を検出する過電流引きはずし回路７と、この過電流引きはずし回路７の出力信号により付勢される引きはずしコイル８ａおよびこの引きはずしコイル８ａ（電磁装置）の付勢時に開閉接点２を開離駆動する引き外し機構８ｂを有する引きはずし装置８と、変流器３および変圧器４の検出信号に基づいて各種電気量を演算する電流/電圧計測回路等の計測回路９と、この計測回路９からの計測値を、表示や通信データに変換して外部に出力する外部入出力回路１０と、計測回路９に相線式の設定、および相線式が単相２線の場合、１−２相間、２−３相間のいずれを使用するかを設定する設定スイッチ１１と、を備えている。
回路遮断器１００の２相−３相間に負荷を接続する場合は、図３に例示のように、電源側の１相−２相間を電線５で短絡して使用する。
Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing an example of the configuration of a circuit breaker, FIG. 2 is a flowchart for explaining the operation, and FIG. 3 is a plan view showing a connection example when a three-pole circuit breaker is used with a single-phase two-wire. FIG.
In FIG. 1, a circuit breaker 100 includes an open / close contact 2 that opens and closes an AC circuit 1, a current transformer 3a inserted in one phase of the AC circuit 1, a current transformer 3b inserted in two phases, and a three-phase circuit. A current transformer 3 having an inserted current transformer 3c, a transformer 4a having a transformer 4a inserted between the 1-2 phases of the AC circuit 1, and a transformer 4b having been inserted between the 2-3 phases; An overcurrent trip circuit 7 for detecting an overcurrent based on a detection signal from the flow device 3, a trip coil 8a energized by an output signal of the overcurrent trip circuit 7, and the trip coil 8a (electromagnetic device) ), A tripping device 8 having a tripping mechanism 8b that opens and closes the switching contact 2, and a current / voltage measuring circuit that calculates various amounts of electricity based on detection signals from the current transformer 3 and the transformer 4. From the measurement circuit 9 and the like External input / output circuit 10 that converts the measured value into display or communication data and outputs it to the outside, and setting of the phase wire system in the measurement circuit 9 and when the phase wire system is single-phase 2-wire, between 1-2 phases, And a setting switch 11 for setting which one to use between the two and three phases.
When connecting a load between the two phases and the three phases of the circuit breaker 100, as shown in FIG.
以下、過電流引きはずし回路７の動作について説明する。交流電路１に電流が流れるとその電流に比例した出力が変流器３に発生する。過電流引きはずし回路７は内部で変流器３の出力に応じた電圧に信号を変換し、その信号より実効値もしくはピーク値を算出する。算出された実効値もしくはピーク値が所定のしきい値を超え、また所定の時間継続した場合、引きはずし装置８に出力する。この出力により引きはずし８ａに励磁電流が流れ、引き外し機構８ｂが動作することにより、開閉接点２が開路する。 Hereinafter, the operation of the overcurrent tripping circuit 7 will be described. When a current flows through the AC circuit 1, an output proportional to the current is generated in the current transformer 3. The overcurrent tripping circuit 7 internally converts the signal into a voltage corresponding to the output of the current transformer 3, and calculates an effective value or a peak value from the signal. When the calculated effective value or peak value exceeds a predetermined threshold value and continues for a predetermined time, the calculated effective value or peak value is output to the tripping device 8. This output causes an exciting current to flow in the tripping 8a, and the tripping mechanism 8b operates to open the switching contact 2.
なお、過電流引きはずし回路７の所定のしきい値および所定の時間は、接続する負荷への配線を保護できる特性を有している。 Note that the predetermined threshold value and the predetermined time of the overcurrent tripping circuit 7 have characteristics capable of protecting the wiring to the connected load.
次に本実施の形態１の計測回路９の動作について説明する。開閉接点２が閉になると交流電路１に印加されている線間電圧に比例した出力が変圧器４に発生する。また交流電路１に電流が流れると、その電流に比例した出力が変流器３に発生する。計測回路９は内部で変圧器４および変流器３の出力に応じた電圧に信号を変換し、その信号より各種の電気量、例えば負荷電流、線間電圧、電力、電力量、力率および周波数等を算出する。外部入出力回路１０は計測回路９の算出値を変換し例えばＬＣＤ表示や汎用通信に出力する。
計測回路９には、設定スイッチ１１により、相線式の設定と、相線式が単相２線の場合、１−２相間、２−３相間のいずれを使用するかを設定する。なお、設定スイッチ１１を設けない場合には、外部入出力回路１０を介して、例えば表示器の操作や通信により、設定する機能を有してもよい。
Next, the operation of the measurement circuit 9 according to the first embodiment will be described. When the switching contact 2 is closed, an output proportional to the line voltage applied to the AC circuit 1 is generated in the transformer 4. When a current flows through the AC circuit 1, an output proportional to the current is generated in the current transformer 3. The measuring circuit 9 internally converts a signal into a voltage corresponding to the output of the transformer 4 and the current transformer 3, and various electric quantities such as load current, line voltage, electric power, electric energy, power factor and the like from the signal. Calculate frequency, etc. The external input / output circuit 10 converts the calculation value of the measurement circuit 9 and outputs it to, for example, an LCD display or general-purpose communication.
In the measurement circuit 9, the setting switch 11 is used to set the phase wire type setting and, when the phase wire type is a single-phase two-wire type, which one between the 1-2 phase and the 2-3 phase is used. When the setting switch 11 is not provided, the setting switch 11 may have a function of setting via the external input / output circuit 10 by, for example, operation of a display device or communication.
次に計測時の処理を図２にもとづき説明する。まず、相線式の設定値が単相２線かを判定し、単相２線以外であれば処理を終了する（ステップ３１）、次に単相２線であれば１−２相、２−３相のどちらを使用する設定になっているかを判定する（ステップ３２）。次に１−２相使用であれば３相電流Ｉ３が０Ａ以上流れているかを判定し（ステップ３３）、０Ａ以上であれば１−３相に負荷が誤配線されていると判断し、過電流引きはずし回路７に引きはずし装置８の作動要求を出力する（ステップ３５）。２−３相使用であれば１相電流Ｉ１が０Ａ以上流れているかを判定し（ステップ３４）、０Ａ以上であれば１−３相に負荷が誤配線されていると判断し、過電流引きはずし回路７に引きはずし装置８の作動要求をする（ステップ３５）。 Next, the measurement process will be described with reference to FIG. First, it is determined whether the set value of the phase wire system is single-phase two-wire. If it is other than single-phase two-wire, the process is terminated (step 31). It is determined which of the three phases is set to be used (step 32). Then if 1-2 phase using three-phase current I 3 determines whether flowing or 0A (step 33), it is determined that the load on the 1-3 phase if 0A or higher is miswiring, An operation request for the tripping device 8 is output to the overcurrent tripping circuit 7 (step 35). If 2-3 phase using 1-phase current I 1 judges whether the flow over 0A (step 34), it is determined that the load on the 1-3 phase if 0A or higher is miswiring, overcurrent An operation request for the tripping device 8 is made to the tripping circuit 7 (step 35).
本実施の形態１によれば、負荷を誤配線し電流が流れた場合、過電流引きはずし回路７を介して引きはずし装置８が駆動され、開閉接点２が開路するため、相間短絡用の電線５の保護が可能となる。 According to the first embodiment, when a load is miswired and a current flows, the tripping device 8 is driven via the overcurrent tripping circuit 7 and the switching contact 2 is opened. 5 protection becomes possible.
また、前記実施の形態では、引きはずし装置８が駆動され、開閉接点２が開路するが、外部入出力回路１０を介して、例えば表示器や通信により警報を出力することも可能である。さらに、開閉接点２が開路させるか、警報を出力させるかを設定により選択することも可能である。 In the above embodiment, the tripping device 8 is driven and the switching contact 2 is opened, but an alarm can be output via the external input / output circuit 10 by, for example, a display or communication. Furthermore, it is possible to select whether the switching contact 2 is opened or an alarm is output by setting.
実施の形態２．
図４は本発明の実施の形態２における回路遮断器の構成の一例を示すブロック図、図５は本発明の実施の形態２における回路遮断器の動作を説明するためのフローチャートである。
本実施の形態における回路遮断器１０１は、図４に示すように、実施の形態１では設けていた設定スイッチ１１を廃止し、相線式および使用する相間の設定を不要としたものである。その他の構成については、実施の形態１と同様であるので、説明を省略する。
Embodiment 2. FIG.
FIG. 4 is a block diagram showing an example of the configuration of the circuit breaker according to Embodiment 2 of the present invention, and FIG. 5 is a flowchart for explaining the operation of the circuit breaker according to Embodiment 2 of the present invention.
As shown in FIG. 4, the circuit breaker 101 in the present embodiment eliminates the setting switch 11 provided in the first embodiment, and makes the setting of the phase wire type and the phase to be used unnecessary. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
計測時の処理を図５にもとづき説明する。まず、１−２相間電圧Ｖ１−２の値と２−３相間電圧Ｖ２−３の値より、１−２相間電圧Ｖ１−２が所定の電圧値以上、例えばＡＣ１００Ｖ以上を判定するために８０Ｖ、かつ２−３相間電圧Ｖ２−３が０Ｖであるか（ステップ４１）、もしくは２−３相間電圧Ｖ２−３が所定の電圧値以上、かつ１−２相間電圧Ｖ１−２が０Ｖであるか（ステップ４２）を判定する。いずれの条件も満たさない場合は、相線式が単相２線以外、もしくは例えば上位の開閉器が開路しており、１−２相間、２−３相間の両方に電圧が印加されていない、と判定し処理を終了する。次に１−２相間電圧Ｖ１−２が所定の電圧値以上、かつ２−３相間電圧Ｖ２−３が０Ｖである場合は、１−２相間使用とし、３相電流が０Ａ以上流れているかを判定し（ステップ４３）、０Ａ以上であれば１−３相に負荷が誤配線されていると判断し、過電流引きはずし回路７に引きはずし装置８の作動要求を出力する（ステップ４５）。２−３相間電圧Ｖ２−３が所定の電圧値以上、かつ１−２相間電圧Ｖ１−２が０Ｖである場合は、２−３相使用とし、１相電流が０Ａ以上流れているかを判定し（ステップ４４）、０Ａ以上であれば１−３相に負荷が誤配線されていると判断し、過電流引きはずし回路７に引きはずし装置８の作動要求をする（ステップ４５）。 Processing at the time of measurement will be described with reference to FIG. First, 1-2 than the value of interphase voltage V 1-2 values and 2-3 interphase voltage V 2-3, 1-2 interphase voltage V 1-2 is the predetermined voltage value or more, for example to determine or AC100V 80 V and the 2-3 phase voltage V 2-3 is 0 V (step 41), or the 2-3 phase voltage V 2-3 is equal to or higher than a predetermined voltage value and the 1-2 phase voltage V 1-2. Is 0V (step 42). When neither condition is satisfied, the phase wire type is other than single-phase two-wire, or, for example, the upper switch is open, and no voltage is applied between both phases 1-2 and 2-3. To end the process. Then 1-2 interphase voltage V 1-2 is the predetermined voltage value or more, and 2-3 phase voltage V 2-3 is 0V, and used between 1-2 phase flow 3-phase current 0A more (Step 43), if it is 0 A or more, it is determined that the load is miswired in the 1-3 phase, and the operation request for the device 8 is output to the overcurrent trip circuit 7 (Step 45). ). 2-3 interphase voltage V 2-3 is the predetermined voltage value or more, and 1-2 when interphase voltage V 1-2 is 0V, the 2-3 phase using a one-phase current is flowing more 0A If it is 0A or more, it is determined that the load is miswired in the 1-3 phase, and the overcurrent trip circuit 7 is requested to operate the trip device 8 (step 45).
本実施の形態２によれば、相線式および使用する相間の設定をせずとも、単相２線で負荷を誤配線し電流が流れた場合、過電流引きはずし回路７を介して引きはずし装置８が駆動され、開閉接点２が開路するため、相間短絡用の電線５の保護が可能となる。 According to the second embodiment, even if the phase wire type and the setting between the phases to be used are not set, if the load is miswired with the single-phase two-wire and the current flows, the trip is made via the overcurrent trip circuit 7. Since the device 8 is driven and the switching contact 2 is opened, it is possible to protect the electric wire 5 for short-circuiting between phases.
また、前記実施の形態１と同様に、例えば、表示器や外部出力回路１０を用いて通信により警報を出力することも可能である。さらに、開閉接点２が開路させるか、警報を出力させるかを設定により選択することも可能である。 Further, similarly to the first embodiment, for example, an alarm can be output by communication using a display or an external output circuit 10. Furthermore, it is possible to select whether the switching contact 2 is opened or an alarm is output by setting.
前記、本実施の形態１、実施の形態２は３極品の遮断器について記載したが、４極品においても、同様に構成できることは明確である。 Although the first and second embodiments have described the circuit breaker of the three-pole product, it is clear that the same configuration can be applied to the four-pole product.
また、本実施の形態では、過電流引きはずし部は電子回路による検出であるが、機械式、例えば熱動電磁形においても、誤配線検出時に計測回路９もしくは、外部入出力回路１０から引きはずし装置８を駆動するための電磁装置を設置することにより適用できることは明確である。 In this embodiment, the overcurrent tripping part is detected by an electronic circuit. However, even in the case of a mechanical type, for example, a thermal electromagnetic type, the tripping part is detached from the measurement circuit 9 or the external input / output circuit 10 when erroneous wiring is detected. It is clear that it can be applied by installing an electromagnetic device for driving the device 8.
前述のように、本発明の実施の形態の概念的特徴は以下の通りである。
特徴１：３極以上の回路遮断器であって、極数より少ない相数の電路に電源および負荷が接続され、前記接続がされる相のうちの一相と前記接続がされない相とが電線で短絡される回路遮断器であって、各相の電流を計測する計測回路を有し前記接続がされない相の電流を前記計測回路が計測するとトリップ動作して前記電線に流れる負荷電流を遮断する回路遮断器である。
特徴２：特徴１の回路遮断器において、前記接続がされない相の電流を前記計測回路が計測すると、前記負荷が誤接続であることを報知する報知出力を前記計測回路が出す回路遮断器である。
特徴３：３極以上の回路遮断器であって、極数より少ない相数の電路に電源および負荷が接続され、前記接続がされる相のうちの一相と前記接続がされない相とが電線で短絡される回路遮断器であって、各相の電流を計測する計測回路を有し、適用する相線および使用される相間が前記計測回路に設定され、前記設定された前記適用する相線および前記使用される相間に基づいて、前記接続がされない相の電流の有無を前記計測回路が判定し、前記接続がされない相の電流があると前記計測回路が判定するとトリップ動作して前記電線に流れる負荷電流を遮断する回路遮断器である。
特徴４：特徴３の回路遮断器において、前記接続がされない相の電流があると前記計測回路が判別すると、前記負荷が誤接続であることを報知する報知出力を前記計測回路が出す回路遮断器である。
特徴５：３相以上の交流の各相の電路に設けられた遮断接点、前記電路の各相を１次巻線とする各相の変流器、それぞれ前記電路の異なる相間を１次側とする複数の変圧器、および前記各相の変流器の各出力および前記複数の変圧器の各出力が入力される計測回路を備え、前記３相以上の前記交流の相数より少ない相数の前記電路に電源および負荷が接続され、前記接続がされる相のうちの一相と前記接続がされない相とが電線で短絡される回路遮断器であって、前記変圧器の各々の出力に基づいて前記接続がされない相を前記計測回路が判別するとともに、前記接続がされない相の電流の有無を前記計測回路が判定し、前記接続がされない相の電流があると前記計測回路が判定するとトリップ動作して前記電線に流れる負荷電流を遮断する回路遮断器である。
特徴６：特徴５の回路遮断器において、前記接続がされない相の電流があると前記計測回路が判別すると、前記負荷が誤接続であることを報知する報知出力を前記計測回路が出す回路遮断器である。
特徴７：交流電路に設置された遮断接点と、前記交流電路を１次巻線とする変流器と、前記交流電路の相間を１次側とする変圧器と、変流器の二次出力から前記交流電路の過電流の有無を判定し所定の条件となった場合に信号を出力する過電流引きはずし回路と、この過電流引きはずし回路の出力信号に基づき前記遮断接点を引き外すように設けられた電磁装置と、前記変流器の２次出力および前記変圧器の２次出力から、必要な各種の電気量を算出する電流/電圧計測回路と、この電流/電圧計測回路での計測値を表示部や通信部に出力しかつ前記電流/電圧計測回路に設定値等を出力する外部入出力回路と、適用する電路を設定する機能および電路が単相２線の場合は１−２相間もしくは２−３相間のいずれを使用するか設定する機能を備え、未使用の相に電流が流れたことを検知し、遮断器をトリップすることにより、相間短絡用の電線を保護する回路遮断器である。
特徴８：特徴７の回路遮断器において、１−２相間電圧、２−３相間電圧の計測値から、適用されている電路が単相２線であるか否かを判別し、判別の結果が単相２線であるときは、１−２相間もしくは２−３相間のいずれが使用されているかを判別する機能を備え、未使用の相に電流が流れたことを検知し、遮断器をトリップすることにより、相間短絡用の電線を保護する回路遮断器である。
As described above, the conceptual features of the embodiment of the present invention are as follows.
Feature 1: A circuit breaker having three or more poles, wherein a power source and a load are connected to an electric circuit having a number of phases less than the number of poles, and one phase of the connected phases and a phase that is not connected are electric wires. A circuit breaker that is short-circuited by a circuit and has a measurement circuit that measures the current of each phase, and when the measurement circuit measures the current of the phase that is not connected, a trip operation is performed to cut off the load current that flows through the wire Circuit breaker.
Feature 2: The circuit breaker according to feature 1, wherein when the measurement circuit measures a current of a phase that is not connected, the measurement circuit outputs a notification output informing that the load is erroneously connected. .
Feature 3: A circuit breaker having three or more poles, wherein a power source and a load are connected to an electric circuit having a number of phases smaller than the number of poles, and one of the phases to be connected and the phase not to be connected are electric wires. A circuit breaker that is short-circuited with a measuring circuit that measures the current of each phase, the phase line to be applied and the phase to be used are set in the measuring circuit, and the set phase line to be applied is set And, based on the phase between the phases used, the measurement circuit determines whether or not there is a current of the phase that is not connected, and when the measurement circuit determines that there is a current of the phase that is not connected, a trip operation is performed on the wire. It is a circuit breaker that cuts off the flowing load current.
Feature 4: In the circuit breaker of feature 3, when the measurement circuit determines that there is a current of the phase that is not connected, the circuit breaker outputs a notification output for notifying that the load is erroneously connected. It is.
Feature 5: Breaking contacts provided in the electric circuit of each phase of AC of three or more phases, current transformers of each phase having each phase of the electric circuit as a primary winding, and between the different phases of the electric circuit as the primary side A plurality of transformers, and measuring circuits to which the respective outputs of the current transformers of the respective phases and the outputs of the plurality of transformers are input, the number of phases being less than the number of phases of the AC of the three or more phases A circuit breaker in which a power source and a load are connected to the electric circuit, and one of the phases to be connected and the phase to which the connection is not made are short-circuited by an electric wire, based on the output of each of the transformers When the measurement circuit determines the phase that is not connected, the measurement circuit determines whether there is a current of the phase that is not connected, and the trip operation when the measurement circuit determines that there is a current of the phase that is not connected. And cut off the load current flowing through the wire A road breaker.
Feature 6: The circuit breaker of the circuit breaker according to feature 5, wherein when the measurement circuit determines that there is a current of a phase that is not connected, the measurement circuit outputs a notification output for notifying that the load is erroneously connected. It is.
Feature 7: Breaking contact installed in AC circuit, current transformer having primary winding as AC circuit, transformer having primary side between phases of AC circuit, and secondary output of current transformer To determine whether there is an overcurrent in the AC circuit and to output a signal when a predetermined condition is met, and to disconnect the breaking contact based on the output signal of the overcurrent trip circuit A current / voltage measuring circuit for calculating various necessary electric quantities from the provided electromagnetic device, the secondary output of the current transformer and the secondary output of the transformer, and measurement by this current / voltage measuring circuit An external input / output circuit that outputs a value to a display unit or a communication unit and outputs a set value to the current / voltage measurement circuit, a function for setting an electric circuit to be applied, and 1-2 when the electric circuit is a single-phase two-wire Has a function to set whether to use between phases or between 2-3 phases It detects that the current flows in phases unused, by tripping the circuit breaker is a circuit breaker for protecting the electric wire for phase short.
Feature 8: In the circuit breaker of Feature 7, it is determined whether or not the applied electric circuit is a single-phase two-wire from the measured values of the voltage between the 1-2 phases and the voltage between the 2-3 phases. When it is a single-phase 2-wire, it has a function to determine whether between 1-2 phase or 2-3 phase is used, it detects that current has flown into the unused phase, and trips the circuit breaker By doing so, it is a circuit breaker that protects the electric wire for short circuit between phases.
なお、本発明は、その発明の範囲内において、各実施の形態を適宜、変形、省略することができる。
なお、各図中、同一符合は同一または相当部分を示す。
In the present invention, each embodiment can be appropriately modified or omitted within the scope of the invention.
In addition, in each figure, the same code | symbol shows the same or an equivalent part.
１ 交流電路、 ２ 開閉接点、
３ 変流器、 ４ 変圧器、
５ 電線、 ７ 過電流引きはずし回路、
８ 引きはずし装置、 ８ａ 引きはずしコイル（電磁装置）、
９ 計測回路、 １０ 外部入出力回路、
１１ 設定スイッチ、 １００ 回路遮断器。
1 AC circuit, 2 Switching contacts,
3 Current transformer, 4 Transformer,
5 Electric wire, 7 Overcurrent trip circuit,
8 Tripping device, 8a Tripping coil (electromagnetic device),
9 Measurement circuit, 10 External input / output circuit,
11 Setting switch, 100 Circuit breaker.
Claims (6)
6. The circuit breaker according to claim 5, wherein when the measurement circuit determines that there is a current of a phase that is not connected, the measurement circuit outputs a notification output that notifies that the load is erroneously connected. A circuit breaker.
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| JP2014037771A JP6116499B2 (en) | 2014-02-28 | 2014-02-28 | Circuit breaker |
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| JP6116499B2 true JP6116499B2 (en) | 2017-04-19 |
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