CN203376466U - A detection and verification system of a power transformer partial discharge ultrasonic sensor - Google Patents

Abstract

The utility model provides a partial discharge ultrasonic sensor detection and verification system for power transformers, which includes a partial discharge simulation device arranged in the transformer oil tank; The high-voltage lead wire is connected to the ground; the ultrasonic sensor is set inside the transformer oil tank; the output end of the ultrasonic sensor is respectively connected with the oscilloscope, the input end of the transient recorder and the ultrasonic positioning monitoring system; the output end of the transient recorder is connected with the computer. Compared with the prior art, the utility model provides a detection and verification system for partial discharge ultrasonic sensors of power transformers, which realizes accurate and simple performance evaluation of different sensors for partial discharge and location detection of power transformers.

Description

A Detection and Calibration System for Partial Discharge Ultrasonic Sensors of Power Transformers

technical field

The utility model discloses a detection and verification system for an ultrasonic sensor, in particular to a detection and verification system for a partial discharge ultrasonic sensor of a power transformer. the

Background technique

The power transformer is one of the important equipment in the power system, and its safe operation is of great significance; in the field operation, the partial discharge of the power transformer is one of the important reasons leading to the deterioration of the insulation of the power transformer. However, the accurate positioning of partial discharge sources inside large power transformers has always been a difficult problem in the field of high-voltage equipment insulation detection; various countries have carried out a lot of research work on the mechanism of partial discharge in transformers, and made great progress. Localization methods for partial discharge sources inside power transformers include:

Existing detection methods mainly use ultrasonic positioning method to detect partial discharge physical quantities to find out whether partial discharge has occurred inside the transformer; when partial discharge occurs inside the transformer, signals such as electromagnetic waves, discharge pulses, and ultrasonic waves will be generated, and ultrasonic waves will be generated in the transformer. Propagate in different media (oil paper, windings and partitions, etc.), and reach the ultrasonic sensor fixed on the wall of the transformer oil tank; use multiple ultrasonic sensors to measure the time delay of the signals measured by different sensors, and determine the position through the calculation of the positioning algorithm The location of the source. The ultrasonic signal generated by the partial discharge of power transformers is generally very weak. The higher the sensitivity of the ultrasonic sensor, the easier it is to detect the weak signal, and the signal-to-noise ratio will be improved accordingly. The ultrasonic signal is converted into a voltage signal. the

The goal of transformer partial discharge ultrasonic sensor calibration is to obtain the response characteristics of the sensor, that is, to determine the transfer function of the sensor. Usually the exact expression of the transfer function is difficult to give, but in engineering applications, the response characteristics of the sensor will be drawn in the form of graphs, which is the common sensitivity curve. The use range of the sensor can be evaluated by the sensitivity curve of the sensor. Sensitivity curves are usually given as frequency versus output voltage under given conditions. the

At present, there is no calibration standard for ultrasonic sensors for partial discharge localization of power transformers in China, so it is particularly important to provide a detection and calibration system for partial discharge ultrasonic sensors of power transformers. the

Contents of the invention

In order to meet the needs of the prior art, the utility model provides a detection and verification system for a partial discharge ultrasonic sensor of a power transformer, which includes a partial discharge simulation device arranged in the transformer oil tank; The bushings are respectively connected to the high-voltage leads of the non-partial discharge step-up transformer and the ground; the ultrasonic sensor is arranged inside the transformer oil tank; the output end of the ultrasonic sensor is respectively connected to the input end of the oscilloscope, the transient recorder and the ultrasonic positioning monitoring system connected; the output terminal of the transient recorder is connected with the computer. the

Preferably, the detection and verification system includes a power transformer partial discharge detection system and a partial discharge location detection system; the ultrasonic sensors of the power transformer partial discharge detection system include ultrasonic sensors to be tested symmetrically arranged on both sides of the transformer oil tank. sensor and a standard ultrasonic sensor; the partial discharge simulation device is arranged at the center of the transformer oil tank; the ultrasonic sensor of the partial discharge location detection system is the ultrasonic sensor to be tested arranged at any position inside the transformer oil tank; The partial discharge simulation device is set at any position inside the transformer oil tank;

Preferably, the electrode partial discharge simulation device includes a pin plate electrode simulation device, a ball plate electrode simulation device, a suspension electrode simulation device, a surface electrode simulation device, an air gap electrode simulation device and a flat plate electrode simulation device; the electrode partial discharge simulation device The device realizes needle plate discharge in oil, oil-paper insulation discharge, floating potential discharge in oil, surface discharge of insulating cardboard, air bubble discharge in oil and defect discharge of insulating cardboard;

Preferably, the ultrasonic sensor to be tested of the partial discharge location detection system is connected to the ultrasonic location monitoring system through a feeder; the number of the ultrasonic sensors to be tested is N, and N is at least 2;

The ultrasonic positioning monitoring system respectively monitors the positioning detection results of the same electrode partial discharge simulation device by the ultrasonic sensor to be tested; compares the positioning detection results with the actual discharge position of the electrode partial discharge simulation device for judgment The sensitivity of the ultrasonic sensor to be tested; the actual discharge position is obtained by three-dimensional coordinate measurement;

Preferably, when the ultrasonic sensor to be tested is a UHF sensor, the UHF sensor is connected to the UHF positioning monitoring system through the feeder; the number of the UHF sensors is M, and M is at least 2;

The UHF positioning monitoring system respectively monitors the positioning detection results of the same electrode partial discharge simulation device by the UHF sensor; compares the positioning detection results with the actual discharge position of the electrode partial discharge simulation device to determine the The sensitivity of the UHF sensor; the actual discharge position is obtained by three-dimensional coordinate measurement. the

The beneficial effects of the utility model are:

1. In the technical solution of the utility model, when the ultrasonic sensor detects the partial discharge of the power transformer, an oscilloscope is used to respectively display the output voltage change waveform detected by the ultrasonic sensor to be tested and the standard ultrasonic sensor to the partial discharge simulation device of the same motor, and the ultrasonic sensor to be tested Sensitivity comparison judgment is more intuitive and convenient;

2. In the technical solution of the utility model, when the ultrasonic sensor detects the partial discharge of the power transformer, the amplitude and phase analysis of the complex value response D (f _m ) of the ultrasonic sensor to be tested is analyzed by the computer, so that the sensitivity of the ultrasonic sensor to be tested is verified more precise;

3. In the technical solution of the utility model, the electrode partial discharge simulation device of the ultrasonic sensor power transformer partial discharge detection system can simulate needle plate discharge in oil, oil paper insulation discharge, suspension potential discharge in oil, insulating cardboard surface discharge, and oil bubble discharge and insulating cardboard defect discharge, providing an accurate test platform for comprehensive verification of ultrasonic sensors;

4. In the technical solution of the utility model, the ultrasonic sensor power transformer partial discharge positioning detection system can realize the performance verification detection between multiple different ultrasonic sensors; at the same time, it can also realize the performance calibration between multiple different UHF sensors. test. the

5. The detection and verification system for partial discharge ultrasonic sensors of power transformers provided by the utility model provides a performance comparison platform for sensors produced by different manufacturers; it realizes accurate and simple detection and positioning of partial discharges of power transformers by different sensors performance evaluation. the

6. The utility model provides a detection and verification system for partial discharge ultrasonic sensors of power transformers. In view of the fact that there are no relevant standards for performance detection and evaluation of power transformer partial discharge ultrasonic sensors in China at present, it has great significance for the formulation of industry standards in the future. reference value. the

7. The utility model provides a detection and verification system for partial discharge ultrasonic sensors of power transformers, which is suitable for other occasions where ultrasonic sensors are used to detect partial discharges, such as ultrasonic detection of partial discharges of gas-insulated combined electrical appliances (GIS), partial discharges of reactors Ultrasonic testing and more. the

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described. the

Figure 1 is a structural diagram of a detection and verification system for a partial discharge ultrasonic sensor of a power transformer provided by the utility model:

Fig. 2 is: the structural diagram of the needle plate electrode simulation device in the embodiment of the present utility model;

Figure 3 is a structural diagram of the ball plate electrode simulation device in the embodiment of the present invention;

Figure 4 is a structural diagram of the floating electrode simulation device in the embodiment of the utility model;

Figure 5 is a structural diagram of the surface electrode simulation device in the embodiment of the utility model;

Figure 6 is a structural diagram of the air-gap electrode simulation device in the embodiment of the present utility model;

Fig. 7 is: the structural diagram of the plate electrode simulation device in the embodiment of the utility model;

Among them, 1: Transformer oil tank; 2: Ultrasonic sensor to be tested; 3: Standard ultrasonic sensor; 4: Oscilloscope; 5: Transient recorder; 6: Computer; 7: Ultrasonic positioning monitoring system; 8: UHF positioning monitoring system; 9 : Transformer bushing 1; 10: Transformer bushing 2; 11: Partial discharge simulation device; 111: Needle plate electrode simulation device; 112: Ball plate electrode simulation device; 113: Suspension electrode simulation device; 114: Surface electrode simulation device; 115: air gap electrode simulation device; 116: flat plate electrode simulation device; 12: high voltage electrode; 13: insulating cardboard; 14: ground electrode; 15: suspended metal; 167: internal defect of insulating cardboard; 17: parallel gap of insulating cardboard. the

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. the

Fig. 1 shows the structural diagram of a detection and verification system of a partial discharge ultrasonic sensor of a power transformer provided by the utility model; the detection and verification system includes a partial discharge simulation device 11 arranged inside a transformer oil tank 1; a partial discharge simulation device One end of 11 is connected to the high-voltage lead of the non-partial discharge step-up transformer through the transformer bushing 1, and the other end is connected to the ground through the transformer bushing 2; the ultrasonic sensor is arranged inside the transformer oil tank 1; the output ends of the ultrasonic sensor are respectively connected to the oscilloscope 4, The input end of the transient recorder 5 is connected with the ultrasonic positioning monitoring system 7 ; the output end of the transient recorder 5 is connected with the computer 6 . the

The detection and verification system includes a power transformer partial discharge detection system and a partial discharge location detection system:

(1): When the detection and verification system detects the partial discharge of the power transformer, the ultrasonic sensor includes the ultrasonic sensor 2 to be tested and the standard ultrasonic sensor 3; the ultrasonic sensor 2 to be tested and the standard ultrasonic sensor 3 are symmetrically arranged in the transformer oil tank 1 Both sides; the partial discharge simulation device 11 is arranged in the central position of the inside of the transformer oil tank 1; the waveform verification of the same partial discharge simulation device and partial discharge detection is carried out by the oscilloscope 4 to be tested ultrasonic sensor 2 and standard ultrasonic sensor 3, thereby Analyzing and judging the sensitivity of the ultrasonic sensor to be tested 2; at the same time, the sensitivity of the ultrasonic sensor to be tested can be more accurately verified through the computer to analyze the amplitude and phase of the complex response D (f _m ) of the ultrasonic sensor to be tested;

(2) ①: When the detection and verification system detects the localization of partial discharge, the ultrasonic sensor is the ultrasonic sensor 2 to be tested which is arranged at any position inside the transformer oil tank 1; the partial discharge simulation device 11 is arranged at any position inside the transformer oil tank 1 position; the ultrasonic sensor 2 to be tested is connected to the ultrasonic positioning monitoring system 7 through a feeder; the number of the ultrasonic sensors 2 to be measured is N, and N is at least 2; the ultrasonic positioning monitoring system 7 monitors the ultrasonic sensor 2 to be measured respectively to the same described electrode The positioning detection result of the partial discharge simulation device; compare the positioning detection result with the actual discharge position of the electrode partial discharge simulation device 11, and judge the sensitivity of the ultrasonic sensor 2 to be tested; the actual discharge position is obtained by three-dimensional coordinate measurement. the

②: When the ultrasonic sensor is replaced by a UHF sensor 3, the UHF sensor 3 is connected to the UHF positioning monitoring system 8 through a feeder; the number of UHF sensors 3 is M, and M is at least 2;

The UHF positioning monitoring system 8 monitors the positioning detection results of the same electrode partial discharge simulation device 11 by the UHF sensor 3 respectively; compares the positioning detection results with the actual discharge position of the electrode partial discharge simulation device 11, and judges the sensitivity of the UHF sensor 3 ; The actual discharge position is obtained by three-dimensional coordinate measurement. the

Fig. 2 shows the structural diagram of the needle plate electrode simulation device in this embodiment; Fig. 3 shows the structural diagram of the ball plate electrode simulation device in this embodiment; Fig. 4 shows the structural diagram of the suspension electrode simulation device in this embodiment; Fig. 5 shows the structure diagram of surface electrode simulation device in this embodiment; Fig. 6 shows the structure diagram of air gap electrode simulation device in this embodiment; Fig. 7 shows the structure diagram of plate electrode simulation device in this embodiment; electrode The partial discharge simulation device 11 includes a pin plate electrode simulation device 111, a ball plate electrode simulation device 112, a suspension electrode simulation device 113, a surface electrode simulation device 114, an air gap electrode simulation device 115 and a flat plate electrode simulation device 116; The device 11 realizes needle plate discharge in oil, oil-paper insulation discharge, floating potential discharge in oil, surface discharge of insulating cardboard, air bubble discharge in oil and defect discharge of insulating cardboard. the

Finally, it should be noted that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application. the

Claims (5)

1. the detection check system of a Partial Discharge in Power Transformer sonac, described detection check system comprises the shelf depreciation analogue means be arranged in oil tank of transformer, it is characterized in that, the two ends of described shelf depreciation analogue means are connected with ground with the high-voltage connection without the shelf depreciation step-up transformer respectively by bushing shell for transformer; Sonac is arranged on described oil tank of transformer inside; The output terminal of described sonac is connected with the localization by ultrasonic monitoring system with the input end of oscillograph, instantaneous state recorder respectively; The output terminal of described instantaneous state recorder is connected with computing machine.

2. the detection check system of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 1, is characterized in that, described detection check system comprises Partial Discharge in Power Transformer detection system and local breakdown location detection system; The described sonac of described Partial Discharge in Power Transformer detection system comprises sonac to be measured and the standard ultrasound sensor that is symmetricly set on described oil tank of transformer both sides; Described shelf depreciation analogue means is arranged on described oil tank of transformer center; The described sonac of described shelf depreciation position detecting system is the sonac described to be measured that is arranged on the inner optional position of described oil tank of transformer; Described shelf depreciation analogue means is arranged on the inner optional position of described oil tank of transformer.

3. the detection check system of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 1, it is characterized in that, described shelf depreciation analogue means comprises needle plate electrode analogue means, ball plate electrode analogue means, suspension electrode analogue means, along face electrode analogue means, Air-gap electrode analogue means and plate electrode analogue means; Described shelf depreciation analogue means is realized respectively floating potential discharge, insulating board creeping discharge, bubble in oil electric discharge and the electric discharge of insulating board defect in needle plate electric discharge in oil, paper oil insulation electric discharge, oil.

4. the detection check system of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 2, is characterized in that, the sonac described to be measured of described shelf depreciation position detecting system is connected with the localization by ultrasonic monitoring system by feeder line; The number of described sonac to be measured is N, and N is at least 2;

Described localization by ultrasonic monitoring system is monitored respectively the detection and localization result of described sonac to be measured to same described shelf depreciation analogue means; The actual discharge position of described detection and localization result and described shelf depreciation analogue means is compared to the sensitivity of the described sonac to be measured of judgement; Described actual discharge position obtains by three-dimensional coordinate measurement.

5. the detection check system of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 4, is characterized in that, when described sonac to be measured is the UHF sensor, described UHF sensor is connected with the UHF positioning monitoring system by described feeder line; The number of described UHF sensor is M, and M is at least 2;

Described UHF positioning monitoring system is monitored respectively the detection and localization result of described UHF sensor to same described shelf depreciation analogue means; The actual discharge position of described detection and localization result and described shelf depreciation analogue means is compared to the sensitivity of the described UHF sensor of judgement; Described actual discharge position obtains by three-dimensional coordinate measurement.

Images