CN101852836A - System of detecting partial discharge in equipment - Google Patents
System of detecting partial discharge in equipment Download PDFInfo
- Publication number
- CN101852836A CN101852836A CN 201010168861 CN201010168861A CN101852836A CN 101852836 A CN101852836 A CN 101852836A CN 201010168861 CN201010168861 CN 201010168861 CN 201010168861 A CN201010168861 A CN 201010168861A CN 101852836 A CN101852836 A CN 101852836A
- Authority
- CN
- China
- Prior art keywords
- signal
- uhf signal
- pulse
- discharge
- equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000001360 synchronised effect Effects 0.000 claims abstract description 17
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000003750 conditioning effect Effects 0.000 description 26
- 238000010586 diagram Methods 0.000 description 14
- 230000035945 sensitivity Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000452 restraining effect Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000010187 selection method Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 206010038743 Restlessness Diseases 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 240000001439 Opuntia Species 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
- 230000000699 topical effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Abstract
The invention discloses a system and a method of detecting partial discharge in equipment, aiming to solve the problems of worse detection accuracy of discharge types inside equipment and failure on effectively inhibiting various interferences in a detection environment in the prior art. The method of detecting partial discharge in equipment comprises the following steps: simultaneously detecting a UHF signal generated inside the equipment from two positions; computing the ratio of two pulse amplitudes of each group in multi-group synchronous pulse in the UHF signal detected from the two positions; and outputting the phase-amplitude relationship of the UHF signal according to a plurality of the ratios. By adopting the technical proposal of the invention, discharge types of multi-source discharge inside the equipment can be distinguished.
Description
Technical field
The present invention relates to the power technology field, in particular to a kind of system of detecting partial discharge in equipment.
Background technology
Gas-insulated switch GIS (Gas Insulated Switchgear) is the important component part of grid equipment, and its quantity is big, is widely used in urban distribution network.The GIS compact conformation, very responsive to the small insulation defect in inside, cause the major accident of insulation breakdown easily, the operation conditions of equipment can't be effectively understood in conventional tour; Since the totally-enclosed property of GIS, site examining and repairing environmental requirement height, the disassemble and assemble work amount is big, and power off time is long, the recondition expense costliness.The non-maintaining operation of GIS year is limited to about 15 years, and the time overwhelming majority that breaks down is in and just puts into operation and when closing on the life-span.China has a large amount of new GIS to put into operation every year, also has some GIS to reach the non-maintaining operation time limit of regulation successively.How to guarantee the safe operation of these equipment, avoid unnecessary interruption maintenance simultaneously, save recondition expense, this is the GIS major issue that faces in service.And partial-discharge ultrahigh-frequency UHF (Ultra HighFrequency) online measuring technique apply health status for anticipation GIS, avoid the generation of electrical network substantial equipment accident, guarantee that safe operation, raising overhaul of the equipments and the maintenance efficiency of GIS has positive meaning and favorable social and economic benefits.In addition, at present UHF shelf depreciation online measuring technique also is widely used in detection and the monitoring that put the part of high voltage electric equipments such as power transformer, power cable.
The UHF Partial Discharge Detection has good anti-corona interference performance, so itself promptly is applied to the detection of shelf depreciation as a kind of antijamming measure.For the situation that equipment under test itself exists multi-source to discharge, existing UHF detection mode can cause the signal spectrum that mixes from forfeiture discharge signal statistical recognition feature, and is relatively poor to the detection accuracy of electric discharge type.And, often there is complex electromagnetic environments at the residing scene of equipment under test, more randomness broadband, narrow-band interferer are arranged, as the suspension discharge of mobile phone signal, radio or television signal, automobile motor, lead corona, site operation electric welding machine and lighting source, high-voltage terminal end, the discharge on the nearby device or the like, these all detect to cause to the high voltage electric power equip ment office scene of putting and have a strong impact on.Therefore, the interference of band overlapping is arranged and improve detection sensitivity, become the bottleneck of UHF detection method rig-site utilization for how suppressing these drawn game discharge signals.
For guaranteeing detection sensitivity, existing products has the mode that adopts broadband amplification/detection to handle on hardware both at home and abroad, and this mode is for mobile phone, arrowband communication signal suppressing poor effect.For strong interference environment,, can't carry out normal useful signal at all and extract and analyzing and diagnosing especially because system writes down and gather undesired signal all the time; Another kind of product adopts the arrowband frequency selection method to suppress selective interference on hardware, a little less than but its problem is that some type of topical discharge (as the discharge of GIS disc insulator surface or inherent vice initiation) UHF signal, danger is but very big, and this arrowband mode exists big not enough aspect detection sensitivity; And disturb (as the suspension on the casing air, graininess discharge) for some discharge-type of device external, the interior shelf depreciation frequency spectrum coverage of its frequency spectrum and equipment almost is identical, and the mode of frequency-selecting does not suppress effect to this interference.
In relevant technical scheme, relatively poor to the detection accuracy of device interior electric discharge type, and can't effectively suppress the various interference that exist in the testing environment, at the problems referred to above, effective solution is not proposed as yet at present.
Summary of the invention
The object of the present invention is to provide a kind of system of detecting partial discharge in equipment, relatively poor to solve in the prior art to the detection accuracy of device interior electric discharge type, and can't effectively suppress the problem of the various interference that exist in the testing environment.
To achieve these goals, according to an aspect of the present invention, provide a kind of apparatus local discharge detection method.
Apparatus local discharge detection method of the present invention comprises: simultaneously from the inner UHF signal that produces of two location detecting apparatus; Calculating from two position probing to the UHF signal in many groups synchronizing pulse the ratio of two pulse amplitudes of each group; Export the phase place-magnitude relation of described UHF signal according to a plurality of described ratios.
Further, phase place-magnitude relation of exporting described UHF signal according to described ratio comprises: determine the ratio interval according to a plurality of described ratios, export the phase place-magnitude relation of the synchronizing pulse of the interval correspondence of each described ratio.
Further, before the inner UHF signal that produces of two location detecting apparatus, described method also comprises: set the detecting pattern of described detection, described detecting pattern comprises broadband demodulation pattern and arrowband frequency-selecting pattern at the same time.
Further, comprise from the inner UHF signal that produces of two location detecting apparatus simultaneously: the UHF signal of while checkout equipment inside and device external; The intensity of the UHF signal of synchronous more detected described device interior and device external; Determine to result from the UHF signal of device interior the part of described device interior according to the magnitude relationship of described intensity.
Further, at the same time before the UHF signal of checkout equipment inside and device external, described method also comprises: determine the duty of ratio of the definite type of type and institute of pulse of the external noise of described equipment, recently set from the detecting pattern of described device interior detection UHF signal according to described type and described duty.
Further, described detecting pattern comprises broadband demodulation pattern and arrowband frequency-selecting pattern.
Further, the type of pulse of determining the external noise of described equipment comprises: the narrow-band demodulation waveform of the pulse of the UHF signal of described device external and preliminary election type is carried out related operation obtain related coefficient; Determine the type of pulse of the external noise of described equipment according to described related coefficient.
To achieve these goals, according to an aspect of the present invention, provide a kind of system of detecting partial discharge in equipment.
System of detecting partial discharge in equipment of the present invention comprises: the first detection module and second detection module are used for the UHF signal that produces from two location detecting apparatus portions simultaneously; Computing module is used for calculating the ratio from per two pulse amplitudes of the many groups of described UHF signal synchronizing pulse, exports the phase place-magnitude relation of described UHF signal according to a plurality of described ratios; Output module is used to export the content that described computing module is determined.
Further, described computing module also is used for determining the ratio interval according to a plurality of described ratios, exports the phase place-magnitude relation of the synchronizing pulse of the interval correspondence of each described ratio.
Further, also comprise the 3rd detection module, be used in the UHF signal of described first detection module, the second detection module checkout equipment inside, detecting the UHF signal of this device external; Described computing module also is used for the intensity of the UHF signal of more detected described device interior and device external synchronously, determines to result from the UHF signal of device interior the part of described device interior according to the magnitude relationship of described intensity.
Use technical scheme of the present invention, by the UHF signal that produces from two location detecting apparatus inside simultaneously; Calculating from two position probing to the UHF signal in many groups synchronizing pulse the ratio of two pulse amplitudes of each group; Export the phase place-magnitude relation of described UHF signal according to a plurality of described ratios, can be to multi-source discharge the carrying out differentiation of electric discharge type of device interior.And, among the present invention, UHF signal by while checkout equipment inside and device external, the intensity of the UHF signal of synchronous then more detected described device interior and device external, determine to belong in the UHF signal of device interior the part of described device interior again according to the magnitude relationship of described intensity, can will remove in the inner detected signal of the pulse slave unit of device external signal, thereby reach the purpose of suppression equipment external disturbance, be convenient to the various electric discharge phenomena of analytical equipment inside better.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the disturbance restraining method process flow diagram that detects according to the apparatus local discharge in the embodiment of the invention;
Fig. 2 is the interference waveform detection synoptic diagram that prestores in the embodiment of the invention;
Fig. 3 A is having only signal transducer to detect under the situation of pulse signal when the scene is detected in the embodiment of the invention, the detected signal waveform synoptic diagram of signal transducer and noise transducer;
Fig. 3 B is having only noise transducer to detect under the situation of pulse signal when the scene is detected in the embodiment of the invention, the detected signal waveform synoptic diagram of signal transducer and noise transducer;
Fig. 3 C detects under the situation of synchronizing signal the detected signal waveform synoptic diagram of signal transducer and noise transducer at signal transducer and noise transducer when detecting in the embodiment of the invention;
Contain the statistics spectrogram of interference in the signal that Fig. 4 A to Fig. 4 D is respectively signal transducer receives in the embodiment of the invention a signal, noise transducer receives, the signal that signal transducer receives and remove statistics spectrogram after disturbing;
Fig. 5 is the statistics spectrogram that obtains at single location detecting apparatus internal discharge signal in the prior art;
Fig. 6 is the process flow diagram according to the apparatus local discharge detection method in the embodiment of the invention;
Fig. 7 A and Fig. 7 B are the synoptic diagram of the device interior discharge signal that arrives according to two sensor synchronous detection that adopt diverse location in the embodiment of the invention;
Fig. 8 is the synoptic diagram that separates statistics according to the discharge pulse cluster in the embodiment of the invention;
Fig. 9 A is the spectrogram that separates according to the discharge pulse cluster that realizes in the embodiment of the invention with Fig. 9 B; And
Figure 10 is the synoptic diagram according to the system of detecting partial discharge in equipment structure in the embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Below in conjunction with Fig. 1 to Fig. 4 D, the disturbance restraining method that the apparatus local discharge in the present embodiment detects is made an explanation.According to this method, can realize will the device external signal the inner detected signal of pulse slave unit in remove, thereby reach the purpose of suppression equipment external disturbance.
Fig. 1 is the disturbance restraining method process flow diagram that detects according to the apparatus local discharge in the embodiment of the invention.
As shown in Figure 1, this method comprises following step S12 to S16:
Step S12: slave unit inside and device external detect the UHF signal simultaneously.In the present embodiment, adopt double mode numerical control conditioning receiver and the noise transducer inner and device external detection UHF signal of slave unit respectively.
Step S14: the intensity of the UHF signal of more detected synchronously device interior and device external.
Step S16: confirm to belong to the part that device external is disturbed in the inner detected UHF signal of slave unit according to the magnitude relationship of described intensity.
Below specify for above-mentioned steps S14 and step S16.
The detection signal and the noise transducer signal of conditioning receiver carry out Domain Synchronous (two paths of signals is followed generation, and the time interval is less and stable) check and analysis, and whether differentiate according to its amplitude size cases is undesired signal.Because the conditioning receiver is positioned over device interior or near the disc insulator place of GIS for example, the position of equipment, and taked special-purpose shielding measure, and noise transducer is positioned over apart from equipment than distant positions, its effective take over party's face is towards the external space, therefore for external interference signals, the signal (abbreviation internal signal) that the conditioning receiver is coupled to will be significantly less than noise transducer (abbreviating external signal as); Otherwise as for the device interior discharge signal then noise transducer can not effectively receive or detect and obtain less amplitude.Therefore, for conditioning receiver and the detected synchronous signal of noise transducer, if the amplitude of this synchronous signal that the conditioning receiver detects illustrates so that greater than the amplitude of this synchronous signal of noise transducer detection this synchronizing signal results from device interior; Otherwise then come from device external, can confirm promptly that in this case this synchronizing signal is an external disturbance.
The particular content of present embodiment technical scheme is described below by an actual detection system.In the detection system below, in order to guarantee that nursing one's health receiver can have higher sensitivity, at first determine the duty of ratio of the definite type of type and institute of pulse of the external noise of equipment, the detecting pattern of setting the inner detection of slave unit UHF signal according to the result who determines is promptly nursed one's health the detecting pattern of receiver again.The detecting pattern here mainly comprises broadband demodulation pattern and arrowband frequency-selecting pattern.
Hardware mainly uses by acquisition controlling unit, double mode numerical control conditioning receiver, signal transducer (being no less than 2 groups), noise transducer coordinated.Wherein double mode numerical control conditioner has broadband amplification demodulator, two kinds of working methods of arrowband frequency-selecting, respectively be arranged on device interior or be used near the signal transducer of the position of equipment and the noise transducer that is arranged on device external.The conditioning receiver in the parameter of broadband amplification demodulator pattern is: 200M～2GHz bandwidth, gain is not less than 45dB.The prime amplifier analog bandwidth is 200M～2GHz under the arrowband frequency-selecting mode of operation, and centre frequency is adjustable continuously from 200MHz～1.2GHz, and intermediate-freuqncy signal is amplified output after the filtering of 30MHz low-pass filter.Noise transducer omnidirectional receives, 200M～2GHz bandwidth, and gain is not less than 45dB.Disturbance restraining method in the present embodiment is implemented on this hardware foundation.
In the present embodiment, system sets conditioning receiver operation pattern by software mode according to in-site measurement environmental background noise situation.The in-site measurement environment has following four kinds of typical case basically:
First kind of situation: background noise level is not high, has communication interference of accidental type arrowband and pulsed discharge signal.
Second kind of situation: ground unrest is bigger, not only exists the arrowband communication signal to disturb, and has a large amount of discharge pulse signals (disturb based on device external bus and nearby device discharge, be mixed with the device interior discharge pulse signal).
The third situation: ground unrest is bigger, based on continuous arrowband communication undesired signal, this moment undesired signal in or be mixed with the pulsed discharge signal, discharge pulse signal is buried in oblivion in undesired signal more.
The 4th kind of situation: environmental interference is extremely strong, not only has stable, the extremely strong selective interference of amplitude, and exist a large amount of discharge pulse signals (near the base station, the business district exists a large amount of cellphone subscribers and vehicle, stand in the discharge etc. of other equipment and high-pressure conductor).
Test macro standard configuration in the present embodiment: 3 input channels; Passage 1 is a signal transducer, and passage 2 is a signal transducer, and passage 3 is the noise transducer passage.The conditioning receiver of passage 1,2 correspondences exists broadband direct detection and two kinds of mode of operations of arrowband frequency-selecting; The conditioning receiver of passage 3 noise channel correspondences is a broadband direct detection mode.
This system is provided with the mode of operation of conditioning receiver at above 4 kinds of concrete disturbed conditions, and switches automatically according to environmental form.The effect that mode of operation is set is to make not comprise the signal that does not obviously belong to the device interior discharge generation in the signal that measures as far as possible.Consider the narrow band signal of present wireless telecommunications, for example 900MHz or 1800MHz signal are obviously different with the signal of device interior discharge generation, and these narrow band signal quantity are many, scope is wide, therefore in the present embodiment with the waveform of these narrow band signals as the interference waveform detection that prestores, this waveform is as shown in Figure 2.
In when test, at first double mode numerical control conditioning receiver can be set in the broadband demodulation mode of operation, at first work in Sensitive Detection pattern with the assurance system, promptly the signal to all frequency bands detects; And the inhibit feature that is lower than the radio broadcasting interference etc. of 200MHz by UHF detection means itself for low-frequency pulse undesired signal, frequencies such as corona discharge, distant place commutating pulse, switching manipulations suppresses general low-frequency disturbance.
Next to the preferable mode of operation of conditioning receiver operation mode initialization.Being to compare according to detected signal of noise transducer and the interference waveform detection that prestores at this moment, specifically is to carry out related operation, belongs to any in above-mentioned four kinds of situations to judge current environment.Concrete grammar is as follows:
Adopt the signal of the device detection noise sensor reception of DISCHARGE PULSES EXTRACTION, duration is that (influence of eliminating accidental interference requires to possess certain detection duration to some power frequency periods, be generally the 20ms integral multiple, being several gets final product to the dozens of power frequency period), the signal that noise transducer is received carries out DISCHARGE PULSES EXTRACTION and obtains detecting pulse waveform, and transfer the arrowband communication signal demodulator waveform that prestores each independent vein is rushed in the line correlation computing, among the following condition 1-4 which judgement belong to, and judges the testing environment characteristics with this.Satisfy condition 1, regard as first kind of environmental form, set numerical control conditioning receiver operation in the broadband demodulation pattern; Satisfy condition 2, regard as second kind of environmental form, set numerical control conditioning receiver operation in the broadband demodulation pattern.Can be undertaken by noise transducer Domain Synchronous windowing technology under these two kinds of environment, and guarantee highest detection sensitivity.If satisfy condition 3, regard as the third working environment, set numerical control conditioning receiver operation in arrowband frequency-selecting pattern; If satisfy condition 4, regard as the 4th kind of working environment, set numerical control conditioning receiver operation in arrowband frequency-selecting pattern.Below each condition is made an explanation.The numerical control conditioning receiver here should comprise the numerical control conditioning receiver of device interior at least, also can comprise the numerical control conditioning receiver that device external and noise transducer are used.
Condition 1: detect pulse waveform and prestore selective interference waveform detection related coefficient＜setting threshold, the number of times of discharge property pulse is dominant in detecting pulse, and average every power frequency period pulse number＜setting threshold.
Detect pulse waveform and prestore typical narrow-band interference signal waveform correlation coefficient, show that detection signal is the atypia narrow-band interference signal, be discharge property signal (may be device interior fault-signal or external discharge undesired signal) less than setting value; Average power frequency period pulse number shows then that less than setting value signal dutyfactor is lower, is the non-intensive signal that takes place frequently.Corresponding environment is for disturbing less generalized case, and get final product by UHF self antijamming capability this moment, and this moment, the wide band detection mode can best guarantee detection sensitivity.
Condition 2: detect pulse waveform and prestore narrow-band demodulation waveform correlation coefficient＜setting threshold, discharge property pulse number of times in detecting pulse is dominant, and average every power frequency period pulse number 〉=setting threshold.
The testing environment of this condition correspondence is the situation (may be device interior fault-signal or external discharge undesired signal in practice) that has more discharge signal; Average power frequency period pulse number then shows signal dutyfactor higher (but the dutycycle of general pulse signal still is lower than undesired signal) greater than setting value, is the intensive discharge interference environment that takes place frequently.Consider that discharge pulse resolution is higher, so numerical control conditioning receiver should remain in the broadband demodulation mode of operation, ensure under the optimum detection sensitivity situation, effective work that using noise sensor disturbance inhibition means can safeguards system.
Condition 3: detect pulse waveform and prestore narrow-band demodulation waveform correlation coefficient＞setting threshold, the selective interference pulse number is dominant, and average every power frequency period pulse number 〉=setting threshold, and institute's detection signal dutycycle is very big, is indicated as extremely strong selective interference and discharge type and disturbs and dis environment.
Environment corresponding under this condition is extremely strong selective interference environment, in the detection waveform with the waveform of narrow-band, wide duration, signal dutyfactor is very big, no matter there is the pulsed discharge signal, all be better than strong narrow band signal very easily flood dutycycle less put type signal, so the signal condition of signal transducer is that the mode of operation of numerical control conditioning receiver must adopt the arrowband frequency selection method.
Condition 4: detect pulse waveform and prestore narrow-band demodulation waveform correlation coefficient＞setting threshold, the selective interference pulse number is dominant, and average every power frequency period pulse number 〉=setting threshold, and institute's detection signal dutycycle is very big, discharge signal and discharge undesired signal mostly are the situation superimposed with selective interference, are indicated as extremely strong selective interference and disturb and dis environment with strong discharge.The conditioning of this appropriate to the occasion signalization sensor works under the arrowband frequency selection method.
Take place frequently, do not exist intensive overlapping selective interference for non-,, can effectively get rid of by the mode of related operation from its typical waveform feature.As in realization, there being the selective interference of other types, also it can be prestored and use the above-mentioned mode that is similar to Rule of judgment 1-4 that the working method of numerical control conditioning receiver is set.
Whether at last, adopt the detection signal and the noise transducer signal of conditioning receiver to carry out Domain Synchronous (two paths of signals is followed generation, and the time interval is less and stable) check and analysis, differentiating according to its amplitude size cases is undesired signal.Because signal transducer is positioned over device interior or near the disc insulator place of equipment, and taked special-purpose shielding measure, and noise transducer is positioned over apart from equipment than distant positions, its effective take over party's face is towards the external space, therefore for external interference signals, the signal that signal transducer is coupled to (abbreviation internal signal) will be significantly less than noise transducer (abbreviating external signal as); Otherwise as for the device interior discharge signal then noise transducer can not effectively receive, can and then carry out the time domain windowing method and effectively remove by the contrast of inside and outside synchronizing signal amplitude in view of the above.
In the present embodiment, according to the sensitivity that detects employed sensor, amplitude to slave unit inside or the detected UHF signal of device external is made adjustment, and then the amplitude after relatively adjusting, and obtains the magnitude relationship of intensity of the UHF signal of device interior and device external.For this reason, in the present embodiment, at first a simulation signal generator is positioned over range noise sensor and the identical position of signal transducer distance, two effective receive directions of sensor are all towards signal source; Simulation signal generator transponder pulse signal, the signal amplitude peak that the note signal transducer receives is Vs, the synchronizing signal amplitude peak that noise transducer receives is Vn, makes K
0=Vs/Vn; During on-the-spot the detection,, then be judged to be the device interior discharge, as shown in Figure 3A if having only signal transducer to detect pulse signal; If have only noise transducer that signal is arranged, then be judged to be external interference, as Fig. 3 B; If at a certain phase place place, signal transducer and noise transducer all detect signal, synchronizing signal promptly appears, then judges, if Vs/Vn 〉=K according to the ratio of Vs/Vn
0, then be judged to be internal signal, otherwise be judged to be interference, shown in Fig. 3 C.In Fig. 3 A, Fig. 3 B and Fig. 3 C, the expression amplitude is that the waveform of the solid line top of 0V is represented the detected signal of noise transducer, and the waveform of this solid line below is represented the detected signal of signal transducer.For being judged to be interference signals, it is removed from the detected signal record of signal detector.Below provide an algorithm device interior discharge signal statistics spectrogram that how to obtain removing external disturbance is described.
For the device interior sensor of gathering simultaneously and the signal S1 and the S2 of device external noise transducer, carry out following steps 1-3:
1, extracts signal S according to preset threshold and pulse width
1And S
2Pulse train obtains the impulse phase sequence respectively: [S
1X
1, S
1X
2, S
1X
3...], [S
2X
1, S
2X
2, S
2X
3...]; And pulse amplitude sequence: [S
1Y
1, S
1Y
2, S
1Y
3...], [S
2Y
1, S
2Y
2, S
2Y
3...].
2, calculate | S
1X
i-S
2X
j| with S
1Y
i-S
2Y
j, (i=1,2,3...n; J=1,2,3...n) n is the number of pulse, if | S
1X
i-S
2X
j|≤θ, and S
1Y
i-K
0S
2Y
j＜0 (θ＜0.5) then makes S
1Y
i=0.Use θ＜0.5 as synchronous condition herein, the K in the formula
0Be K above
0=Vs/Vn.
3, will be judged to be the pulse (S of interference
1X
i, S
1Y
i) compose and to be null value.It is the pulse of removing external disturbance in the inner detected signal of slave unit.
Fig. 4 A to Fig. 4 D shows respectively and contains the statistics spectrogram of interference in signal that signal transducer receives, signal that noise transducer receives, the signal that signal transducer receives and remove statistics spectrogram after disturbing.In the technical scheme of present embodiment of from figure, can visually see for the inhibition effect of disturbing.
Fig. 5 is the statistics spectrogram that obtains at single location detecting apparatus internal discharge signal in the prior art.From Fig. 5, do not see tangible PHASE DISTRIBUTION feature, cause and to carry out electric discharge type identification accurately and diagnosis to discharge fault.
Fig. 6 is the process flow diagram according to the apparatus local discharge detection method in the embodiment of the invention.As shown in Figure 6, the apparatus local discharge detection method in the embodiment of the invention comprises that following step S61 is to step S65.
Step S61: simultaneously from the inner UHF signal that produces of two location detecting apparatus.
Can carry out as follows according to the method for present embodiment in this step: the UHF signal of the inner and device external of checkout equipment at first simultaneously; The intensity of the UHF signal of synchronous more detected device interior and device external; At last determine to result from the UHF signal of device interior the part of device interior according to the magnitude relationship of this intensity.Undesired signal that like this can the remover apparatus outside.During the inner UHF signal that produces of checkout equipment, can be placed on sensor in the equipment, also can be placed on the correct position position that leaks out easily of internal signal such as leading-out terminal for example of the outside surface of equipment.
In order to improve the degree of accuracy of detection, can set in advance the detecting pattern among the step S61, this detecting pattern can be the broadband demodulation pattern, also can be arrowband frequency-selecting pattern.Can determine the duty of ratio of the definite type of type and institute of pulse of the external noise of equipment earlier, recently set the detecting pattern of the inner detection of slave unit UHF signal then according to the type and this duty.
Step S63: the ratio that calculates per two pulse amplitudes of many group synchronizing pulses from the UHF signal.
In step S61, from the inner UHF signal that produces of two location detecting apparatus, for the pulse of two positions of synchronization, i.e. one group of synchronizing pulse can calculate their ratio.So the many groups synchronizing pulse for a plurality of moment can calculate a plurality of ratios.
Step S65: the phase place-magnitude relation of the inner UHF signal of the ratio output device that calculates according to step S63.
Equipment for reality, the pulse that various types of discharge produced of its inside has different physical propertys, it is different that one of them performance is decay, so same discharge has difference by the detected amplitude of sensor in different positions, and dissimilar pulse, this difference is also different, i.e. the ratio difference that calculates among the step S65, thus can utilize these characteristics to realize that the cluster of device interior discharge pulse separates.Fig. 7 A and Fig. 7 B are the synoptic diagram of the device interior discharge signal that arrives according to two sensor synchronous detection that adopt diverse location in the embodiment of the invention.The ratio that calculates among the step S65 is the ratio of two amplitudes of the same time point in two waveforms shown in Fig. 7 A and Fig. 7 B.
By the number of samples of setting, calculate the ratio of above-mentioned amplitude at a plurality of synchronizing pulses in two waveforms about Fig. 7, again this ratio and synchronizing pulse number are added up in Fig. 8.Fig. 8 is the synoptic diagram that separates statistics according to the discharge pulse cluster in the embodiment of the invention.As shown in Figure 8, the ratio of synchronizing pulse amplitude is concentrated and is distributed in interval 81 and interval 82.Interval 81 and interval 82 corresponding respectively a kind of electric discharge types.
Shown in Fig. 9 A and Fig. 9 B, Fig. 9 A is the spectrogram that separates according to the discharge pulse cluster that realizes in the embodiment of the invention with Fig. 9 B.Wherein each figure embodies a kind of impulse phase of electric discharge type and the relation of amplitude, thereby can carry out the identification and the diagnosis of electric discharge type based on Fig. 9 A and Fig. 9 B.
Obtain Fig. 9, can adopt following mode:
For the selected time point among Fig. 7, the ratio of this time point correspondence falls into interval 81, then this point is retouched in first width of cloth phase place-magnitude relation figure, if this ratio falls into interval 82, then this point is retouched in second width of cloth phase place-magnitude relation figure.Wherein each time described point adopts the same width of cloth figure among Fig. 7 A and Fig. 7 B, promptly or use amplitude among Fig. 7 A, or uses the amplitude among Fig. 7 B.
In the present embodiment, fall into interval 81 point for ratio among Fig. 7 A or Fig. 7 B, described point obtains Fig. 9 A, and ratio falls into interval 82 point, and described point obtains Fig. 9 B.Fig. 9 A and Fig. 9 B according to output obtains can realize discharge mode identification according to these features of adding up spectrogram.
Below in conjunction with Figure 10 system of detecting partial discharge in equipment in the present embodiment is described.Figure 10 is the synoptic diagram according to the system of detecting partial discharge in equipment structure in the embodiment of the invention.
As shown in figure 10, the system of detecting partial discharge in equipment 100 of this enforcement comprises first detection module 102, second detection module 104, computing module 106 and output module 108, wherein, the first detection module 102 and second detection module 104 are used for the UHF signal that produces from two location detecting apparatus portions simultaneously; Computing module 106, be used for calculating ratio from per two pulse amplitudes of the many groups of UHF signal synchronizing pulse, determine a plurality of ratios interval according to a plurality of these ratios, determine the amplitude of the synchronizing pulse of the amplitude ratio correspondence in each ratio interval, and the phase place of this amplitude correspondence; Output module 108 is used to export the content that computing module is determined.Should comprise the sensor that is used to detect discharge signal in the first detection module 102 and second detection module 104, computing module 106 can adopt computing machine or other calculation elements.
Use technical scheme of the present invention, by the UHF signal that produces from two location detecting apparatus inside simultaneously; Calculating from two position probing to the UHF signal in many groups synchronizing pulse the ratio of two pulse amplitudes of each group; Export the phase place-magnitude relation of described UHF signal according to a plurality of described ratios, can be to multi-source discharge the carrying out differentiation of electric discharge type of device interior.And, among the present invention, UHF signal by while checkout equipment inside and device external, the intensity of the UHF signal of synchronous then more detected described device interior and device external, determine to belong in the UHF signal of device interior the part of described device interior again according to the magnitude relationship of described intensity, can will remove in the inner detected signal of the pulse slave unit of device external signal, thereby reach the purpose of suppression equipment external disturbance, be convenient to the various electric discharge phenomena of analytical equipment inside better.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the memory storage and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an apparatus local discharge detection method is characterized in that, comprising:
Simultaneously from the inner superfrequency UHF signal that produces of two location detecting apparatus;
Calculating from two position probing to the UHF signal in many groups synchronizing pulse the ratio of two pulse amplitudes of each group;
Export the phase place-magnitude relation of described UHF signal according to a plurality of described ratios.
2. method according to claim 1, it is characterized in that, phase place-magnitude relation of exporting described UHF signal according to described ratio comprises: determine the ratio interval according to a plurality of described ratios, export the phase place-magnitude relation of the synchronizing pulse of the interval correspondence of each described ratio.
3. method according to claim 1 is characterized in that, before the inner UHF signal that produces of two location detecting apparatus, described method also comprises at the same time:
Set the detecting pattern of described detection, described detecting pattern comprises broadband demodulation pattern and arrowband frequency-selecting pattern.
4. method according to claim 1 is characterized in that, comprises from the inner UHF signal that produces of two location detecting apparatus simultaneously:
The UHF signal of while checkout equipment inside and device external;
The intensity of the UHF signal of synchronous more detected described device interior and device external;
Determine to result from the UHF signal of device interior the part of described device interior according to the magnitude relationship of described intensity.
5. method according to claim 4 is characterized in that, before the UHF signal of checkout equipment inside and device external, described method also comprises at the same time:
Determine the duty of ratio of the definite type of type and institute of pulse of the external noise of described equipment, recently set from the detecting pattern of described device interior detection UHF signal according to described type and described duty.
6. method according to claim 5 is characterized in that, described detecting pattern comprises broadband demodulation pattern and arrowband frequency-selecting pattern.
7. according to claim 5 or 6 described methods, it is characterized in that, determine that the type of pulse of the external noise of described equipment comprises:
The narrow-band demodulation waveform of the pulse of the UHF signal of described device external and preliminary election type is carried out related operation obtain related coefficient;
Determine the type of pulse of the external noise of described equipment according to described related coefficient.
8. a system of detecting partial discharge in equipment is characterized in that, comprising:
The first detection module and second detection module are used for the UHF signal that produces from two location detecting apparatus portions simultaneously;
Computing module is used for
Calculating is the ratios of organizing per two pulse amplitudes of synchronizing pulses from described UHF signal more, export the phase place-magnitude relation of described UHF signal according to a plurality of described ratios;
Output module is used to export the content that described computing module is determined.
9. system according to claim 8 is characterized in that, described computing module also is used for determining the ratio interval according to a plurality of described ratios, exports the phase place-magnitude relation of the synchronizing pulse of the interval correspondence of each described ratio.
10. according to Claim 8 or 9 described systems, it is characterized in that,
Also comprise the 3rd detection module, be used in the UHF signal of described first detection module, the second detection module checkout equipment inside, detecting the UHF signal of this device external;
Described computing module also is used for
The intensity of the UHF signal of synchronous more detected described device interior and device external,
Determine to result from the UHF signal of device interior the part of described device interior according to the magnitude relationship of described intensity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101688612A CN101852836B (en) | 2010-05-05 | 2010-05-05 | System of detecting partial discharge in equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101688612A CN101852836B (en) | 2010-05-05 | 2010-05-05 | System of detecting partial discharge in equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101852836A true CN101852836A (en) | 2010-10-06 |
| CN101852836B CN101852836B (en) | 2012-07-25 |
Family
ID=42804413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101688612A Expired - Fee Related CN101852836B (en) | 2010-05-05 | 2010-05-05 | System of detecting partial discharge in equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101852836B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788582B (en) * | 2010-02-03 | 2012-07-04 | 华北电力大学 | Interference suppression method and device for local discharge detection of equipment |
| CN102565745A (en) * | 2012-03-01 | 2012-07-11 | 华北电力大学 | Ultra high-frequency partial discharge sensor |
| CN103913677A (en) * | 2013-01-07 | 2014-07-09 | 国家电网公司 | Method and system for locating partial discharge source |
| CN104459484A (en) * | 2014-11-13 | 2015-03-25 | 南方电网科学研究院有限责任公司 | Recognition method for on-site interference signals in converter station overhaul workshop |
| CN105115626A (en) * | 2015-09-17 | 2015-12-02 | 李成 | Intelligent monitoring system and method for single-core high-voltage cable connector |
| CN108663608A (en) * | 2018-07-31 | 2018-10-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of multi-source local discharge signal automatic cluster separation method |
| CN108680841A (en) * | 2018-06-26 | 2018-10-19 | 广西电网有限责任公司电力科学研究院 | A kind of Operation Condition of Power Transformers comprehensive monitor system |
| CN110031729A (en) * | 2018-12-08 | 2019-07-19 | 全球能源互联网欧洲研究院 | Detection method, system and the data fusion analytical unit in local discharge signal source |
| CN112255508A (en) * | 2020-09-10 | 2021-01-22 | 深圳供电局有限公司 | Partial discharge positioning method and device, computer equipment and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127889A (en) * | 1994-09-02 | 1996-07-31 | Abb管理有限公司 | A partial discharge sensing device, in particular for use in a gas-insulated apparatus, and partial discharge measuring system using such a sensing device |
| CN2736782Y (en) * | 2004-08-09 | 2005-10-26 | 华北电力大学（北京） | Voltage transformer local discharge ultrahigh frequency (UHF) online monitoring device |
| CN1924595A (en) * | 2006-09-20 | 2007-03-07 | 重庆大学 | Virtual instrument technique based gas insulation combined electric appliances online detecting method |
| CN1955749A (en) * | 2005-10-26 | 2007-05-02 | 韩国电力公社 | Broad band uhf local discharge signal and graphics generator |
-
2010
- 2010-05-05 CN CN2010101688612A patent/CN101852836B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127889A (en) * | 1994-09-02 | 1996-07-31 | Abb管理有限公司 | A partial discharge sensing device, in particular for use in a gas-insulated apparatus, and partial discharge measuring system using such a sensing device |
| CN2736782Y (en) * | 2004-08-09 | 2005-10-26 | 华北电力大学（北京） | Voltage transformer local discharge ultrahigh frequency (UHF) online monitoring device |
| CN1955749A (en) * | 2005-10-26 | 2007-05-02 | 韩国电力公社 | Broad band uhf local discharge signal and graphics generator |
| CN1924595A (en) * | 2006-09-20 | 2007-03-07 | 重庆大学 | Virtual instrument technique based gas insulation combined electric appliances online detecting method |
Non-Patent Citations (1)
| Title |
|---|
| 《中国电机工程学报》 20060228 唐志国等 基于辐射电磁波检测的电力变压器局部放电定位研究 96-101 第26卷, 第3期 2 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788582B (en) * | 2010-02-03 | 2012-07-04 | 华北电力大学 | Interference suppression method and device for local discharge detection of equipment |
| CN102565745A (en) * | 2012-03-01 | 2012-07-11 | 华北电力大学 | Ultra high-frequency partial discharge sensor |
| CN103913677A (en) * | 2013-01-07 | 2014-07-09 | 国家电网公司 | Method and system for locating partial discharge source |
| CN104459484A (en) * | 2014-11-13 | 2015-03-25 | 南方电网科学研究院有限责任公司 | Recognition method for on-site interference signals in converter station overhaul workshop |
| CN104459484B (en) * | 2014-11-13 | 2017-06-09 | 南方电网科学研究院有限责任公司 | The recognition methods of interference signal in a kind of live current conversion station maintenance factory building |
| CN105115626A (en) * | 2015-09-17 | 2015-12-02 | 李成 | Intelligent monitoring system and method for single-core high-voltage cable connector |
| CN108680841A (en) * | 2018-06-26 | 2018-10-19 | 广西电网有限责任公司电力科学研究院 | A kind of Operation Condition of Power Transformers comprehensive monitor system |
| CN108663608A (en) * | 2018-07-31 | 2018-10-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of multi-source local discharge signal automatic cluster separation method |
| CN110031729A (en) * | 2018-12-08 | 2019-07-19 | 全球能源互联网欧洲研究院 | Detection method, system and the data fusion analytical unit in local discharge signal source |
| CN112255508A (en) * | 2020-09-10 | 2021-01-22 | 深圳供电局有限公司 | Partial discharge positioning method and device, computer equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101852836B (en) | 2012-07-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101852836B (en) | System of detecting partial discharge in equipment | |
| CN101788582B (en) | Interference suppression method and device for local discharge detection of equipment | |
| CN101495879B (en) | Detection and monitoring of partial discharge of a power line | |
| CN106443353B (en) | Traveling wave-based GIL discharge fault positioning method and device | |
| CN102331542B (en) | Transformer substation local discharging signal online monitoring and positioning method | |
| CN103913679B (en) | High-tension switch cabinet partial discharge monitoring system | |
| US20150120218A1 (en) | Novel method for real time tests and diagnosis of partial discharge sources in high voltage equipment and installations, which are in service or out of service, and physical system for the practical use of the method | |
| Schichler et al. | UHF partial discharge detection system for GIS: Application guide for sensitivity verification | |
| CN103048590B (en) | Method for positioning fault of power distribution network lines | |
| CN202141781U (en) | Online monitoring and positioning device for transformer station partial discharge signals | |
| Leu et al. | Ultra sensitive TV detector measurements | |
| CN110907775A (en) | UHF-based partial discharge interference signal testing method | |
| CN204945316U (en) | The harvester of live detection electromagnetic interference (EMI) is put in office of transformer station | |
| CN106338653B (en) | Partial discharge typical interference simulation device | |
| CN102147444B (en) | Planar inductive sensor for detecting internal discharge of electric device and detection method | |
| CN202421428U (en) | Hot-line detection equipment for partial discharge of transformer substation | |
| CN106405351A (en) | Partial discharge detection system for switch cabinet | |
| CN105116306A (en) | Acquisition method and device of substation partial discharge live detection electromagnetic interference | |
| CN107561417A (en) | A kind of distributed partial discharge detecting system | |
| CN116593842A (en) | Cable partial discharge detection system and method with broadband and filtering functions | |
| CN102901912B (en) | Local discharge monitoring method for multiple intensively arranged power equipment | |
| Colloca et al. | Comparison among different diagnostic systems for medium voltage cable lines | |
| CN113419152B (en) | Acoustic-electric composite based fault insulator online detection device and detection method | |
| CN208506124U (en) | A kind of anti-interference digital differential current sensor based on wireless synchronization technology | |
| Tang et al. | A combined noise-rejection method for UHF PD detection on-site |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU POWER SUPPLY BUREAU BEIJING RONGKE ELECT Effective date: 20150228 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tang Zhiguo Inventor after: Li Chengrong Inventor after: Wang Caixiong Inventor after: Chang Wenzhi Inventor after: Xiong Jun Inventor after: Wang Wei Inventor before: Tang Zhiguo Inventor before: Li Chengrong Inventor before: Wang Caixiong Inventor before: Chang Wenzhi |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: TANG ZHIGUO LI CHENGRONG WANG CAIXIONG CHANG WENZHI TO: TANG ZHIGUO LI CHENGRONG WANG CAIXIONG CHANG WENZHI XIONG JUN WANG WEI |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20150228 Address after: 102206 Beijing city Changping District, Zhu Daxinzhuang North Agricultural Road No. 2 Patentee after: North China Electric Power University Patentee after: Guangzhou Power Supply Bureau Patentee after: BEIJING RONG TECH ELECTRICAL CO., LTD. Address before: 102206 Beijing city Changping District, Zhu Daxinzhuang North Agricultural Road No. 2 Patentee before: North China Electric Power University |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20170505 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |