CN103344934A - Method and system for detecting and verifying partial discharge of power transformer through ultrasonic sensors - Google Patents

Abstract

The invention provides a method and system for detecting and verifying partial discharge of a power transformer through ultrasonic sensors. The method for detecting and verifying the partial discharge of the power transformer through the ultrasonic sensors includes the steps that A longitudinal wave detection is carried out on the ultrasonic sensors, B the ultrasonic sensors carry out partial discharge detection on the power transformer, and C the ultrasonic sensors carry out positioning detection on the partial discharge. The system for detecting and verifying the partial discharge of the power transformer through the ultrasonic sensors includes an ultrasonic sensor longitudinal wave detection system, an ultrasonic sensor power transformer partial discharge detection system and an ultrasonic sensor power transformer partial discharge positioning detection system. Compared with the prior art, the method and system for detecting and verifying the partial discharge of the power transformer through the ultrasonic sensors achieves the performance evaluation of the power transformer partial discharge and positioning detection accurately, simply and conveniently through the different sensors.

Description

The detection check method and system of Partial Discharge in Power Transformer sonac

Technical field

The present invention relates to a kind of detection check method and system of sonac, specifically relate to a kind of detection check method and system of Partial Discharge in Power Transformer sonac.

Background technology

Power transformer is one of visual plant in the electric system, and its safe operation is significant; In service at the scene, Partial Discharge in Power Transformer is one of major reason that causes electric power transformer insulated deterioration.Yet the accurate location of the inner Partial Discharge Sources of large-scale power transformer is the difficult problem of high voltage installation insulation detection range always; Each country has carried out a large amount of research work to the mechanism of shelf depreciation in the transformer, and has obtained remarkable progress, and the inner Partial Discharge Sources localization method of power transformer comprises in the prior art:

Conventional detection mainly is to find by the play a game detection of putting physical quantity of method for ultrasonic locating whether transformer inside office has taken place put; When transformer is inner when shelf depreciation takes place, can generate electromagnetic waves, signals such as discharge pulse and ultrasound wave, propagate in the different medium of ultrasound wave in transformer by (oilpaper, winding and dividing plate etc.), arrive the sonac that is fixed on the transformer oil tank wall; Measure the time delays of the signal that different sensors measure by a plurality of sonacs, determine that through the calculating of location algorithm office puts the position in source.The ultrasonic signal that power transformer partial discharge produces is generally very faint, and sonac sensitivity is more high, and with regard to the more easy feeble signal that detects, signal to noise ratio (S/N ratio) also can correspondingly be improved; The effect of transformer partial discharge sonac is exactly that the transformer partial discharge ultrasonic signal that will receive is converted to voltage signal.

The target of transformer partial discharge sonac verification is the response characteristic that obtains sensor, namely determines the transport function of sensor.Usually transport function accurately expression formula be difficult to provide, but in engineering is used, can draw the response characteristic of sensor with the form of chart, just common sensitivity curve.Can assess the usable range of sensor by the sensitivity curve of sensor.Sensitivity curve provides with the relation curve of output voltage under frequency and the specified criteria usually.

At present, therefore the domestic partial discharge of transformer of unregulated power still location sonac calibration criterion provides a kind of detection check method and system for the Partial Discharge in Power Transformer sonac to seem particularly important.

Summary of the invention

In order to satisfy the demand of prior art, the invention provides a kind of detection check method of Partial Discharge in Power Transformer sonac; Described method comprises the steps:

A, described sonac is carried out compressional wave detect;

B, described sonac carry out Partial Discharge Detection to described power transformer;

C, described sonac position detection to described shelf depreciation.

Preferably, the described sonac in the described steps A comprises sonac to be measured and standard ultrasound sensor; Instantaneous state recorder is gathered the voltage transient changing value that described sonac to be measured and described standard ultrasound sensor are exported after to same compressional wave sound source waveform measurement respectively; Detect the acoustical behavior of described sonac to be measured by described voltage transient changing value;

Preferably, described voltage transient changing value is carried out Fast Fourier Transform (FFT) handle, obtain standard ultrasound sensor complex value frequency spectrum S(f _m) and sonac replica spectra U(f to be measured _m); By sonac complex value to be measured is responded D(f _m) amplitude and phase analysis described acoustical behavior is carried out verification; Described sonac complex value response D(f to be measured _m) calculated by formula (1):

$D\left(f_m\right)=\frac{U\left(f_m\right)S_0\left(f_m\right)}{S\left(f_m\right)}---\left(1\right)$

Wherein, S ₀(f _m) be standard ultrasound sensor complex value response, obtained by the primary calibration method result of described standard ultrasound sensor; f _mBe frequency; M=0,1,2 ... (n/2)-1, n is the sampling number that described Fast Fourier Transform (FFT) is handled;

Preferably, the described sonac among the described step B comprises sonac to be measured and standard ultrasound sensor; Instantaneous state recorder is gathered the voltage transient changing value that described sonac to be measured and described standard ultrasound sensor are exported after to same electrode shelf depreciation model measurement respectively; Sensitivity by the described sonac to be measured of described voltage transient changing value verification; By oscillograph to the output waveform verification after to same described electrode shelf depreciation model measurement of described sonac to be measured and described standard ultrasound sensor;

Preferably, described voltage transient changing value is carried out Fast Fourier Transform (FFT) handle, obtain standard ultrasound sensor complex value frequency spectrum S(f _m) and sonac replica spectra U(f to be measured _m); By sonac complex value to be measured is responded D(f _m) amplitude and phase analysis verification is carried out in described sensitivity;

Preferably, the number of the described sonac among the described step C is N, and N is at least 2; The localization by ultrasonic monitoring system is monitored described sonac respectively to the detection and localization result of same electrode shelf depreciation model; The actual discharge position of described detection and localization result and described electrode shelf depreciation model is compared the sensitivity of judging described sonac; Described actual discharge position obtains by three-dimensional coordinate measurement;

Preferably, when described sonac was the UHF sensor, the number of described UHF sensor was M, and M is at least 2; The UHF positioning monitoring system is monitored described UHF sensor respectively to the detection and localization result of same described electrode shelf depreciation model; The actual discharge position of described detection and localization result and described electrode shelf depreciation model is compared the sensitivity of judging described UHF sensor; Described actual discharge position obtains by three-dimensional coordinate measurement.

In order to satisfy the demand of prior art, the present invention further provides a kind of detection check system of Partial Discharge in Power Transformer sonac; Described detection check system comprises sonac compressional wave detection system, sonac Partial Discharge in Power Transformer detection system and sonac Partial Discharge in Power Transformer position detecting system;

Described sonac compressional wave detection system comprises sonac to be measured and the standard ultrasound sensor that is symmetricly set on the oil tank of transformer both sides; The supersonic source analogue means is arranged on the center of described oil tank of transformer by the bottom support; Described supersonic source analogue means links to each other with oscillograph by prime amplifier; Described sonac to be measured links to each other with computing machine by instantaneous state recorder respectively with described standard ultrasound sensor.

Preferably, described supersonic source analogue means is glass capillary supersonic source analogue means; The glass capillary of described supersonic source analogue means is placed on the support of described bottom by glass sheet; The diameter of described glass capillary is 0.2mm; Load screw rod and be vertically set on described glass capillary top; Described loading screw rod is exerted pressure to described glass capillary by glass bar;

After described loading screw rod was exerted pressure to described glass capillary, the impulsive force when described glass capillary breaks was the step signal of rise time 0.1us; The value of described impulsive force records by piezoelectric ceramics and the described oscillograph of described loading screw rod;

Preferably, described sonac Partial Discharge in Power Transformer detection system comprises sonac described to be measured and the described standard ultrasound sensor that is symmetricly set on described oil tank of transformer both sides; Electrode shelf depreciation model is arranged on the optional position of described oil tank of transformer; The two ends of described electrode shelf depreciation model link to each other with ground with the high-voltage connection of no shelf depreciation step-up transformer respectively by bushing shell for transformer; Described sonac to be measured links to each other with described oscillograph respectively with described standard ultrasound sensor; Described sonac to be measured links to each other with described computing machine by described instantaneous state recorder respectively with described standard ultrasound sensor;

Preferably, described electrode shelf depreciation model comprise needle plate electrode model, ball plate electrode model, suspension electrode model, along face electrode model, air gap electrode model and plate electrode model; Described electrode shelf depreciation model is realized bubble discharge and the discharge of insulating board defective in floating potential discharge in needle plate discharge in the oil, paper oil insulation discharge, the oil, insulating board creeping discharge, the oil respectively;

Preferably, described sonac Partial Discharge in Power Transformer position detecting system comprises described electrode shelf depreciation model and the described sonac to be measured that is arranged on the inner optional position of described oil tank of transformer; Described sonac to be measured links to each other 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 described sonac to be measured respectively to the detection and localization result of same described electrode shelf depreciation model; The actual discharge position of described detection and localization result and described electrode shelf depreciation model is compared the sensitivity of judging described sonac to be measured; Described actual discharge position obtains by three-dimensional coordinate measurement;

Preferably, when described sonac to be measured was the UHF sensor, described UHF sensor linked to each other with the UHF positioning monitoring system by feeder line; The number of described UHF sensor is M, and M is at least 2;

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

The invention has the beneficial effects as follows:

1, in the technical solution of the present invention, carry out adopting when compressional wave detects oscillograph to show that respectively sonac to be measured and standard ultrasound sensor change waveform to the output voltage of same compressional wave sound source wave test to described sonac, directly perceived more, convenient to the relatively judgement of sonac sensitivity to be measured or acoustical behavior;

2, in the technical solution of the present invention, when described sonac is carried out the compressional wave detection, by the complex value response D(f to sonac to be measured _m) amplitude and phase analysis, make that sonac sensitivity to be measured or acoustical behavior verification are more accurate;

3, in the technical solution of the present invention, when carrying out Partial Discharge Detection to power transformer, adopt by sonac oscillograph to show that respectively sonac to be measured and standard ultrasound sensor change waveform to the output voltage that same motor shelf depreciation model detects, and directly perceived more, convenient to the relatively judgement of sonac sensitivity to be measured;

4, in the technical solution of the present invention, high, the stability of characteristics of supersonic source repeatability that the glass capillary supersonic source analogue means of sonac compressional wave detection system produces is for the acoustical behavior verification of sonac provides guarantee;

5, in the technical solution of the present invention, when sonac carries out Partial Discharge Detection to power transformer, by the complex value response D(f to sonac to be measured _m) amplitude and phase analysis, make that sonac sensitivity verification to be measured is more accurate;

6, in the technical solution of the present invention, the electrode shelf depreciation model of sonac Partial Discharge in Power Transformer detection system can simulated oil in bubble discharge and the discharge of insulating board defective in the floating potential discharge in the needle plate discharge, paper oil insulation discharge, oil, insulating board creeping discharge, oil, for comprehensive verification sonac provides test platform accurately;

7, in the technical solution of the present invention, sonac Partial Discharge in Power Transformer position detecting system can be realized the performance verification between a plurality of different sonacs is detected; Simultaneously also can realize the performance verification between a plurality of different UHF sensors is detected.

8, the detection check method and system of a kind of Partial Discharge in Power Transformer sonac provided by the invention, the sensor of producing for different vendor provides a performance comparison platform; Realized that different sensors detects and accurate, the easy Performance Evaluation of detection and localization Partial Discharge in Power Transformer.

9, the detection check method and system of a kind of Partial Discharge in Power Transformer sonac provided by the invention, present situation at the relevant criterion of the Performance Detection of the present domestic transformer partial discharge of unregulated power still sonac, evaluation has reference value to the formulation of industry standard from now on.

10, the detection check method and system of a kind of Partial Discharge in Power Transformer sonac provided by the invention, be applicable to the occasion that other adopt sonac detection office to put, detect etc. as the detection of gas insulated combined electrical equipment (GIS) type local-discharge ultrasonic, reactor type local-discharge ultrasonic.

Description of drawings

The present invention is further described below in conjunction with accompanying drawing.

Fig. 1 is: the detection check system construction drawing of a kind of Partial Discharge in Power Transformer sonac provided by the invention;

Fig. 2 is: the sonac compressional wave detection system structural drawing in the embodiment of the invention;

Fig. 3 is: the supersonic source analogue means structural drawing in the embodiment of the invention;

Fig. 4 is: the sonac Partial Discharge in Power Transformer detection system structural drawing in the embodiment of the invention;

Fig. 5 is: the electrode shelf depreciation model structure figure in the embodiment of the invention;

Fig. 6 is: the sonac Partial Discharge in Power Transformer position detecting system structural drawing in the embodiment of the invention;

Wherein, 1: fuel tank; 2: transformer oil; 3: sonac to be measured; 4: the standard ultrasound sensor; 5: glass capillary supersonic source analogue means; 51: load screw rod; 52: piezoelectric ceramics; 53: glass bar; 54: glass sheet; 55: glass capillary; 6: prime amplifier; 7: oscillograph; 8: instantaneous state recorder; 9: computing machine; 10: electrode shelf depreciation model; 101: the needle plate electrode model; 102: ball plate electrode model; 103: the suspension electrode model; 104: along the face electrode model; 105: the air gap electrode model; 106: the plate electrode model; 11: bushing shell for transformer 1; 12: bushing shell for transformer 2; 13: high-field electrode; 14: insulating board; 15: ground-electrode; 16: the suspension metal; 17: the insulating board inherent vice; 18: the insulating board parallel clearance; 19: sonac; 20: the sonac positioning monitoring system; The 21:UHF sensor; The 22:UHF positioning monitoring system.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described.

The detection check method step of a kind of Partial Discharge in Power Transformer sonac provided by the invention is: A, described sonac is carried out compressional wave detect; B, described sonac carry out Partial Discharge Detection to described power transformer; C, described sonac position detection to described shelf depreciation;

I:(1) sonac is carried out compressional wave when detecting, instantaneous state recorder is gathered the voltage transient changing value that sonac to be measured and standard ultrasound sensor are exported after to same compressional wave sound source waveform measurement respectively;

(2) the voltage transient changing value is carried out Fast Fourier Transform (FFT) and handle, obtain the amplitude-frequency spectrogram of the amplitude-frequency spectrogram of sensor to be measured and spectrogram and standard transducer mutually and spectrogram mutually respectively; By thereby above-mentioned amplitude-frequency spectrogram is carried out sensitivity or the acoustical behavior that sonac to be measured is relatively judged in data analysis with spectrogram mutually;

Standard ultrasound sensor complex value frequency spectrum S(f _m) and sonac replica spectra U(f to be measured _m) be:

$S\left(f_m\right)=\underset{j=0}{\overset{n-1}{\mathrm{\&Sigma;}}}{s}_j\exp (\mathrm{<figure-callout\; id="2"\; label="i"\; filenames="HDA00003509168700012.png"\; state="\{\{state\}\}">i</figure-callout>}2\mathrm{\&pi;mj}/n);$

$U\left(f_m\right)=\underset{j=0}{\overset{n-1}{\mathrm{\&Sigma;}}}{u}_j\exp (\mathrm{<figure-callout\; id="2"\; label="i"\; filenames="HDA00003509168700012.png"\; state="\{\{state\}\}">i</figure-callout>}2\mathrm{\&pi;mj}/n);$

Wherein, n is the sampling number that Fast Fourier Transform (FFT) is handled;

j=0，1，2…，(n/2)-1；m=0，1，2…，(n/2)-1；

s _jBe j sampled point in the standard ultrasound sensor passage;

u _jBe j sampled point in the sonac passage to be measured;

f _mBe m frequency, the MHz of unit;

Sonac complex value response D(f to be measured _m) be:

Sonac complex value response D(f to be measured _m) amplitude r _m=| D (f _m) |, phase place

Wherein, S ₀(f _m) be standard ultrasound sensor complex value response, obtained by the primary calibration method result of described standard ultrasound sensor;

I _zAnd R _zImaginary part and the real part of representing plural z respectively;

Calibration amplitude W _mUsually the form with dB is expressed as: W _m=20log ₁₀(r _m);

(3) by to the amplitude of sonac to be measured and standard ultrasound sensor and the comparative analysis of phase place, can carry out accurate verification to sensitivity or the acoustical behavior of described sonac to be measured.

When II:(1) sonac carried out Partial Discharge Detection to described power transformer, instantaneous state recorder was gathered the voltage transient changing value that sonac to be measured and standard ultrasound sensor are exported after to same electrode shelf depreciation model measurement respectively; Sensitivity by voltage transient changing value verification sonac to be measured; By oscillograph to the output waveform verification after to same described electrode shelf depreciation model measurement of described sonac to be measured and described standard ultrasound sensor;

(2) the voltage transient changing value is carried out Fast Fourier Transform (FFT) and handle, obtain the amplitude-frequency spectrogram of the amplitude-frequency spectrogram of sensor to be measured and spectrogram and standard transducer mutually and spectrogram mutually respectively; By thereby above-mentioned amplitude-frequency spectrogram is carried out sensitivity or the acoustical behavior that sonac to be measured is relatively judged in data analysis with spectrogram mutually; Standard ultrasound sensor complex value frequency spectrum S(f wherein _m), sonac replica spectra U(f to be measured _m), sonac complex value to be measured response D(f _m), D(f _m) amplitude r _m=| D (f _m) |, D(f _m) phase place

With calibration amplitude W _m=20log ₁₀(r _m) computing method with sonac to be carried out the method that compressional wave detects identical;

(3) by to the amplitude of sonac to be measured and standard ultrasound sensor and the comparative analysis of phase place, can carry out accurate verification to the sensitivity acoustics that described sonac power transformer to be measured carries out Partial Discharge Detection.

III: when sonac positioned detection to described shelf depreciation, the number of sonac was N, and N is at least 2; The localization by ultrasonic monitoring system is monitored sonac respectively to the detection and localization result of same electrode shelf depreciation model; The actual discharge position of detection and localization result and electrode shelf depreciation model is compared the sensitivity of judging sonac to be measured; Wherein the actual discharge position obtains by three-dimensional coordinate measurement;

When above-mentioned sonac replaced with the UHF sensor, the number of UHF sensor was M, and M is at least 2; The UHF positioning monitoring system is monitored the UHF sensor respectively to the detection and localization result of same electrode shelf depreciation model; The actual discharge position of detection and localization result and electrode shelf depreciation model is compared the sensitivity of judging sonac to be measured; Wherein the actual discharge position obtains by three-dimensional coordinate measurement.

The detection check system of a kind of Partial Discharge in Power Transformer sonac provided by the invention as shown in Figure 1, described detection check system comprises sonac compressional wave detection system, sonac Partial Discharge in Power Transformer detection system and sonac Partial Discharge in Power Transformer position detecting system;

Fig. 2 shows the sonac compressional wave detection system structural drawing in the present embodiment; Sonac 3 to be measured and standard ultrasound sensor 4 are symmetricly set on oil tank of transformer 1 both sides; Glass capillary supersonic source analogue means 5 is arranged on the center of oil tank of transformer 1 by the bottom support; Glass capillary supersonic source analogue means 5 links to each other with oscillograph 7 by prime amplifier 6; Sonac 3 to be measured links to each other with computing machine 9 by instantaneous state recorder 8 respectively with standard ultrasound sensor 4;

Fig. 3 shows the supersonic source analogue means structural drawing in the present embodiment; The supersonic source analogue means is glass capillary supersonic source analogue means; The glass capillary 55 of supersonic source analogue means is placed on the support of bottom by glass sheet 54; The diameter of glass capillary 55 is 0.2mm; Load screw rod 51 the glass capillary top vertically is set; Loading screw rod 51 exerts pressure by 53 pairs of glass capillaries 55 of glass bar; After 51 pairs of glass capillaries 55 of loading screw rod were exerted pressure, the impulsive force when glass capillary 55 breaks was the step signal of rise time 0.1us; The value of impulsive force PZT) records with oscillograph 7 by loading the piezoelectric ceramics 52(piezoelectric ceramic transducer of screw rod 51;

Fig. 4 shows the sonac Partial Discharge in Power Transformer detection system structural drawing in the present embodiment; Sonac 3 to be measured and standard ultrasound sensor 4 are symmetricly set on oil tank of transformer 1 both sides; Electrode shelf depreciation model 10 is arranged on the optional position of oil tank of transformer 1 inside; One end of electrode shelf depreciation model 10 links to each other with the high-voltage connection of no shelf depreciation step-up transformer by bushing shell for transformer 1, and the other end is by bushing shell for transformer 2 ground connection; Sonac 3 to be measured links to each other with oscillograph 7 respectively with standard ultrasound sensor 4; Sonac 3 to be measured links to each other with computing machine 9 by instantaneous state recorder 8 respectively with standard ultrasound sensor 4;

Fig. 5 shows the electrode shelf depreciation model structure figure in the embodiment of the invention; Electrode shelf depreciation model comprises needle plate electrode model, ball plate electrode model, suspension electrode model, along face electrode model, air gap electrode model and plate electrode model; Electrode shelf depreciation model is realized bubble discharge and the discharge of insulating board defective in floating potential discharge in needle plate discharge in the oil, paper oil insulation discharge, the oil, insulating board creeping discharge, the oil respectively;

Fig. 6 shows the sonac Partial Discharge in Power Transformer position detecting system structural drawing in the embodiment of the invention; Sonac 19 is the sonac of a plurality of different vendors, and described sonac is arranged on oil tank of transformer 1 inner optional position; Sonac links to each other with localization by ultrasonic monitoring system 20 by feeder line; Localization by ultrasonic monitoring system 20 is monitored the detection and localization result of 19 pairs of same needle plate electrode model 101 shelf depreciations of sonac respectively; The actual discharge position of detection and localization result and needle plate electrode model shelf depreciation is compared, and judge the sensitivity of sonac 19 one by one; Wherein said actual discharge position obtains by three-dimensional coordinate measurement;

When described sonac replaced with to UHF sensor 21, UHF sensor 21 was the UHF sensor of a plurality of different vendors; UHF sensor 21 links to each other with UHF positioning monitoring system 22 by feeder line; UHF positioning monitoring system 22 is monitored the detection and localization result of 21 pairs of same needle plate electrode model 101 shelf depreciations of UHF sensor respectively; The actual discharge position of detection and localization result and needle plate electrode model shelf depreciation is compared, and judge the sensitivity of UHF sensor 21 one by one; Wherein said actual discharge position obtains by three-dimensional coordinate measurement.

Should be noted that at last: described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the application's protection.

Claims (13)

1. the detection check method of a Partial Discharge in Power Transformer sonac is characterized in that, described method comprises the steps:

A, described sonac is carried out compressional wave detect;

B, described sonac carry out Partial Discharge Detection to described power transformer;

C, described sonac position detection to described shelf depreciation.

2. the detection check method of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 1 is characterized in that, the described sonac in the described steps A comprises sonac to be measured and standard ultrasound sensor; Instantaneous state recorder is gathered the voltage transient changing value that described sonac to be measured and described standard ultrasound sensor are exported after to same compressional wave sound source waveform measurement respectively; Detect the acoustical behavior of described sonac to be measured by described voltage transient changing value.

3. the detection check method of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 2 is characterized in that, described voltage transient changing value is carried out Fast Fourier Transform (FFT) handle, and obtains standard ultrasound sensor complex value frequency spectrum S(f _m) and sonac replica spectra U(f to be measured _m); By sonac complex value to be measured is responded D(f _m) amplitude and phase analysis described acoustical behavior is carried out verification; Described sonac complex value response D(f to be measured _m) calculated by formula (1):

$D\left(f_m\right)=\frac{U\left(f_m\right)S_0\left(f_m\right)}{S\left(f_m\right)}---\left(1\right)$

Wherein, S ₀(f _m) be standard ultrasound sensor complex value response, obtained by the primary calibration method result of described standard ultrasound sensor; f _mBe frequency; M=0,1,2 ... (n/2)-1, n is the sampling number that described Fast Fourier Transform (FFT) is handled.

4. the detection check method of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 1 is characterized in that, the described sonac among the described step B comprises sonac to be measured and standard ultrasound sensor; Instantaneous state recorder is gathered the voltage transient changing value that described sonac to be measured and described standard ultrasound sensor are exported after to same electrode shelf depreciation model measurement respectively; Sensitivity by the described sonac to be measured of described voltage transient changing value verification; By oscillograph to the output waveform verification after to same described electrode shelf depreciation model measurement of described sonac to be measured and described standard ultrasound sensor.

5. the detection check method of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 4 is characterized in that, described voltage transient changing value is carried out Fast Fourier Transform (FFT) handle, and obtains standard ultrasound sensor complex value frequency spectrum S(f _m) and sonac replica spectra U(f to be measured _m); By sonac complex value to be measured is responded D(f _m) amplitude and phase analysis verification is carried out in described sensitivity.

6. the detection check method of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 1 is characterized in that, the number of the described sonac among the described step C is N, and N is at least 2; The localization by ultrasonic monitoring system is monitored described sonac respectively to the detection and localization result of same electrode shelf depreciation model; The actual discharge position of described detection and localization result and described electrode shelf depreciation model is compared the sensitivity of judging described sonac; Described actual discharge position obtains by three-dimensional coordinate measurement.

7. the detection check method of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 6 is characterized in that, when described sonac was the UHF sensor, the number of described UHF sensor was M, and M is at least 2; The UHF positioning monitoring system is monitored described UHF sensor respectively to the detection and localization result of same described electrode shelf depreciation model; The actual discharge position of described detection and localization result and described electrode shelf depreciation model is compared the sensitivity of judging described UHF sensor; Described actual discharge position obtains by three-dimensional coordinate measurement.

8. the detection check system of a Partial Discharge in Power Transformer sonac, it is characterized in that described detection check system comprises sonac compressional wave detection system, sonac Partial Discharge in Power Transformer detection system and sonac Partial Discharge in Power Transformer position detecting system;

Described sonac compressional wave detection system comprises sonac to be measured and the standard ultrasound sensor that is symmetricly set on the oil tank of transformer both sides; The supersonic source analogue means is arranged on the center of described oil tank of transformer by the bottom support; Described supersonic source analogue means links to each other with oscillograph by prime amplifier; Described sonac to be measured links to each other with computing machine by instantaneous state recorder respectively with described standard ultrasound sensor.

9. the detection check system of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 8 is characterized in that, described supersonic source analogue means is glass capillary supersonic source analogue means; The glass capillary of described supersonic source analogue means is placed on the support of described bottom by glass sheet; The diameter of described glass capillary is 0.2mm; Load screw rod and be vertically set on described glass capillary top; Described loading screw rod is exerted pressure to described glass capillary by glass bar;

After described loading screw rod was exerted pressure to described glass capillary, the impulsive force when described glass capillary breaks was the step signal of rise time 0.1us; The value of described impulsive force records by piezoelectric ceramics and the described oscillograph of described loading screw rod.

10. the detection check system of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 8, it is characterized in that described sonac Partial Discharge in Power Transformer detection system comprises sonac described to be measured and the described standard ultrasound sensor that is symmetricly set on described oil tank of transformer both sides; Electrode shelf depreciation model is arranged on the optional position of described oil tank of transformer; The two ends of described electrode shelf depreciation model link to each other with ground with the high-voltage connection of no shelf depreciation step-up transformer respectively by bushing shell for transformer; Described sonac to be measured links to each other with described oscillograph respectively with described standard ultrasound sensor; Described sonac to be measured links to each other with described computing machine by described instantaneous state recorder respectively with described standard ultrasound sensor.

11. the detection check system of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 10, it is characterized in that described electrode shelf depreciation model comprises needle plate electrode model, ball plate electrode model, suspension electrode model, along face electrode model, air gap electrode model and plate electrode model; Described electrode shelf depreciation model is realized bubble discharge and the discharge of insulating board defective in floating potential discharge in needle plate discharge in the oil, paper oil insulation discharge, the oil, insulating board creeping discharge, the oil respectively.

12. the detection check system as claim 8 or 10 described a kind of Partial Discharge in Power Transformer sonacs, it is characterized in that described sonac Partial Discharge in Power Transformer position detecting system comprises described electrode shelf depreciation model and the described sonac to be measured that is arranged on the inner optional position of described oil tank of transformer; Described sonac to be measured links to each other 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 described sonac to be measured respectively to the detection and localization result of same described electrode shelf depreciation model; The actual discharge position of described detection and localization result and described electrode shelf depreciation model is compared the sensitivity of judging described sonac to be measured; Described actual discharge position obtains by three-dimensional coordinate measurement.

13. the detection check system of a kind of Partial Discharge in Power Transformer sonac as claimed in claim 12 is characterized in that, when described sonac to be measured was the UHF sensor, described UHF sensor linked to each other with the UHF positioning monitoring system by feeder line; The number of described UHF sensor is M, and M is at least 2;

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

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