CN102435922A - Acoustic-electric combined detection system and positioning method for GIS (Gas Insulated Switchgear) local discharge - Google Patents
Acoustic-electric combined detection system and positioning method for GIS (Gas Insulated Switchgear) local discharge Download PDFInfo
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Abstract
The invention discloses an acoustic-electric combined detection system and a positioning method for GIS (Gas Insulated Switchgear) local discharge. According to the acoustic-electric combined detection system, a high-speed acquisition system and a low-speed acquisition system are integrated into a whole; and a local discharge pulse signal is used as a trigger source for synchronously triggering high-speed acquisition and low-speed acquisition of the signal so as to realize synchronous acoustic-electric combined detection of an ultrahigh frequency signal, a high-frequency current signal and an ultrasonic signal for GIS local discharge. According to the acoustic-electric combined detection system and the positioning method disclosed by the invention, by comprehensively analyzing the ultrahigh frequency signal, the high-frequency current signal and the ultrasonic signal, the field interface can be effectively removed and the accuracy of local discharge detection is increased. By calculating the time differences of the detected ultrahigh frequency signal and ultrasonic signal for local discharge or the time difference between the detected ultrahigh frequency signal and ultrasonic signal, accurate positioning for a local discharge source can be realized.
Description
Technical field
The present invention relates to Partial Discharge Detection, particularly a kind of acoustoelectric combined detection system and localization method of GIS shelf depreciation.
Background technology
Partial Discharge Detection is the effective means of early detection transformer station gas-insulated switch (Gas Insulated Switchgear-is designated hereinafter simply as GIS) shelf depreciation.
Detection method for local discharge commonly used mainly is based on the detection method of electric weight, and it all has application in the GIS Partial Discharge Detection.The coupling capacitance method can be demarcated the discharge capacity size, and detection sensitivity is the highest, and application technology is ripe, but the method detection signal interference source is many, and is not suitable for on-the-spot charged detection.The high-frequency current method is easy for installation at the scene, and the discharge of some type is also had good detection effect, but the interference that this method detects in frequency band is also a lot.The ultrahigh frequency method can be avoided interference such as on-the-spot corona effectively through improving the detection greatest lower band, and detection sensitivity is higher, and can be used for the location.But to detect frequency high because of it, and the bandwidth of detection system hardware and sampling rate etc. are had very high requirement.Have the researcher to carry out down conversion process, realized that local discharge superhigh frequency signal low speed gathers and detect through methods such as mixing and envelope detections, but after the frequency reducing because of the losing of acquired signal information, can not be applied to the location of GIS shelf depreciation.Supercritical ultrasonics technology can be avoided the interference of electric aspect, can be used for accurate location, but its decay is fast, and valid analysing range is little, and the testing amount is very big in using at the scene.Based on the acoustoelectric combined detection method of signals such as ultrahigh frequency and ultrasound wave, characteristics that can comprehensive two types of detection methods are maximized favourable factors and minimized unfavourable ones, and realize the GIS Partial Discharge Detection better.The Primary Location that the signal amplitude size of the ultra-high frequency signal arrival diverse location uhf sensor that this method GIS shelf depreciation also capable of using is excited or the time difference are realized shelf depreciation; Utilize the time difference of ultra-high frequency signal and ultrasonic signal, perhaps the time difference between the ultrasonic signal is realized the accurate location of shelf depreciation.
Exploitation has a lot of portable GIS office to put detection system based on acoustoelectric combined method at present, if this type systematic adopts down conversion process, because of sampling rate is low, can not the office of being used for put the location.If be used for the location; The SF that requires because of ultra-high frequency signal is very high; Generally adopt the hypervelocity oscillograph as the system hardware platform, the restriction that receives its plate to carry storage space like this, the limited length of continuous sampling; Can't obtain the amplitude PHASE DISTRIBUTION atlas analysis that abundant partial discharge pulse's signal is used to discharge, the diagnosis of therefore can not discharging.
On the other hand, according to the different detection principle, the on-the-spot charged detection system of GIS adopts the different detection amount, like high-frequency current, and ultrasound wave or ultra-high frequency signal.To the data acquisition of these different amounts, different because of its frequency band distribution, detection system is different to the requirement of sampling rate.If detect above-mentioned signal simultaneously, system needs compatible high low speed different sample rate, has increased the complicacy of system configuration like this.Also do not have to be applied to simultaneously acoustoelectric signal at present and detect, and can realize the report of the partial discharge detecting system of shelf depreciation amplitude PHASE DISTRIBUTION atlas analysis and shelf depreciation source location.
Summary of the invention
The object of the present invention is to provide local discharge electroacoustic united detection system of a kind of GIS and localization method; Native system is integrated in one high speed acquisition device, low speed harvester; Through partial discharge pulse's signal itself as the triggering source; The high speed acquisition of synchronous triggering signal and low speed collection are to realize the synchronous acooustic combination detection to ultrahigh frequency, high-frequency current and the ultrasonic signal of GIS shelf depreciation.Through analysis-by-synthesis to three kinds of signals, can effectively get rid of on-the-spot the interference, improve the accuracy of Partial Discharge Detection.Through calculating the location that the local discharge superhigh frequency pulse signal detected and ultrasonic pulse signal itself or the time difference between the two also can realize Partial Discharge Sources.
Technical solution of the present invention is following:
The local discharge electroacoustic united detection system of a kind of GIS, its characteristics are that this system comprises hypervelocity data processing module, low speed data processing module and control analysis module:
Described hypervelocity data processing module comprises ultra-high frequency signal treatment circuit, high-frequency current treatment circuit; The ultra-high frequency signal sensor groups of described ultra-high frequency signal treatment circuit links to each other with the input end of amplifier with hypervelocity synchronous data collection card through the ultra-high frequency signal limiter, and the High Frequency Current Sensor of described high-frequency current treatment circuit links to each other through the input end of high-frequency current signal amplifier with described multichannel hypervelocity synchronous data collection card;
Described low speed data processing module comprises ultrasonic signal treatment circuit and power frequency component processing electric power; The ultrasonic signal sensor groups of described ultrasonic signal treatment circuit links to each other through the input end of ultrasonic signal amplifier with the multi-path low speed data collecting card, and the power frequency component sensor of described power frequency component treatment circuit links to each other through the input end of power frequency component wave filter with described multi-path low speed data collecting card;
Described multichannel hypervelocity synchronous data collection card is connected by the radioshielding line with described multi-path low speed data collecting card trigger pip interface;
Described multichannel hypervelocity synchronous data collection card and described multi-path low speed data collecting card are installed in same PXI (PCI eXtensions for Instrumentation; PCI expansion towards instrument system) in the frame; Connect through the data bus in the frame; And be connected with described control analysis module through PCI Express interface; Described control analysis module is controlled described multichannel hypervelocity synchronous data collection card and described multi-path low speed data collecting card, and the data of its collection are carried out Treatment Analysis, storage and demonstration
The detection frequency band of described ultra-high frequency signal sensor is 200MHz～1500MHz; The detection frequency band of described High Frequency Current Sensor is 1MHz～40MHz; The resonance centre frequency of described ultrasonic signal sensor is 150kHz, the added power-frequency voltage signal of described power frequency component sensors coupled shelf depreciation test product.
Described hypervelocity data processing module with partial discharge pulse's signal itself as trigger pip; This trigger pip exports described low speed data capture card through the trigger pip output port of ultra-high-speed data acquisition card to through high frequency coaxial shielded signal line locking, the trigger pip of gathering as low speed data simultaneously.
Described control analysis module is a computing machine that has based on the system software of LabVIEW virtual instrument platform exploitation, and described software comprises system configuration module, data acquisition module and data processing module three parts:
Described system configuration module mainly is selection and the import pathway that system configuration parameter is provided for the operator through human-computer interaction interface: what need dispose at first is detecting pattern, and system provides ultrahigh frequency detection, high-frequency current detection, ultrasound detection and three's multiple array configuration selective; After detecting pattern was confirmed, computing machine disposed correlation parameter with automatic or manual, comprised sampling rate, sampling length, triggering level, sample magnitude scope, phase alignment skew;
Described data acquisition module is mainly accomplished data acquisition and memory function according to the parameter of system configuration module settings: in the data acquisition, system shows the original waveform and the data of sampling in real time, and the monitoring data collection state; The data preservation can be selected the PRPD spectrum data after original waveform data or the calculating as required;
Described data processing module mainly carries out time domain to the shelf depreciation original waveform data of being gathered, and frequency domain, amplitude and PHASE DISTRIBUTION analysis also show correlated results, for the shelf depreciation diagnosis provides foundation.
A kind of detection method of utilizing the local discharge electroacoustic united detection system of described GIS to carry out Partial Discharge Sources is characterized in that this method comprises the following steps:
1., according to the ambient conditions and the detecting pattern of transformer station's gas-insulated switch to be measured; Rationally lay ultra-high frequency signal sensor, High Frequency Current Sensor and the ultrasonic signal sensor of the local discharge electroacoustic united detection system of described GIS, carry out being connected of system's miscellaneous part setting and circuit;
2., after the system start-up; Described system software acquiescence gets into the system configuration module; Through the systematic parameter configuration interface; Supply the operator to select detecting pattern with interactive means, system provides ultrahigh frequency detection, high-frequency current detection, ultrasound detection and three's multiple array configuration selective; After detecting pattern is confirmed, system will dispose automatically or with interactive means manual adjustment sampling parameter, mainly comprise sampling rate, sampling length, triggering level, sample magnitude scope, phase alignment skew, and system configuration is accomplished;
3. after system configuration is accomplished; Click data is gathered the sampling of key log-on data: described control analysis module starts corresponding sensor and carries out synchro measure, and the output terminal of described multichannel hypervelocity synchronous data collection card and described multi-path low speed data collecting card import the Wave data of being gathered into described control analysis module respectively through system data bus and PCI Express interface;
4., described data analysis processing module is carried out time domain to the shelf depreciation original waveform data of being gathered; Frequency-domain analysis and shelf depreciation amplitude and PHASE DISTRIBUTION analysis; And the shelf depreciation amplitude PHASE DISTRIBUTION collection of illustrative plates of gained is presented in the interface in real time, for the diagnosis and the location of Partial Discharge Sources provides foundation.
Described ultra-high-speed data acquisition; Adopt the fast frame acquisition technique, system with partial discharge pulse's waveform as a sample frame, on the whole sampling time; Only gather and contain the waveform segment of partial discharge pulse, and abandon other a large amount of non local discharge pulse Wave datas.
The determination methods of described shelf depreciation is: after the local discharge electroacoustic united detection system operate as normal of described GIS begins; Described control analysis module receives two kinds and above signal in ultra-high frequency signal, high-frequency current signal and the ultrasonic signal of described ultra-high frequency signal sensor, High Frequency Current Sensor, ultrasonic signal sensors coupled simultaneously through hypervelocity data processing module, low speed data processing module, can judge directly that there is shelf depreciation in transformer station to be measured gas-insulated switch.
The localization method of described Partial Discharge Sources; Be based on that amplitude or the time difference, ultrahigh frequency and the ultrasonic signal time difference or the multiplex ultrasonic signal time difference of the multichannel ultra-high frequency signal of native system position; The described time difference tries to achieve based on the energy accumulation method, and the location of described Partial Discharge Sources comprises Primary Location and accurately locatees.
Described Primary Location method comprises
1. judge through signal amplitude: after system detected local discharge signal, it was nearer to judge tentatively that through the amplitude of multichannel ultra-high frequency signal relatively Partial Discharge Sources leaves the bigger sensor of amplitude;
2. judge through calculating the ultra-high frequency signal time difference: through comparing the ultra-high frequency signal amplitude; Judged after the approximate location of shelf depreciation; Propagate into time difference of different uhf sensors through calculating local discharge signal, can be in the meter accuracy scope position of Primary Location Partial Discharge Sources.
The accurate positioning method of described Partial Discharge Sources is the result of the system according to the invention shelf depreciation Primary Location of carrying out; Detect ultrasonic signal near ultrasonic sensor is arranged in Partial Discharge Sources, carry out further accurately location according to the time difference of ultrasonic signal and ultra-high frequency signal.
Compared with prior art, advantage of the present invention is following:
The present invention is based on the local discharge electroacoustic united detection system of portable GIS of virtual instrument technique, the innovative point that compared with prior art has following four aspects:
One, the present invention is based on virtual instrument technique, cost is lower, and software development cycle is short, and structure is flexible, and very strong extendability is arranged.
Two, the present invention can detect ultra-high frequency signal, high-frequency current signal and the ultrasonic signal of shelf depreciation simultaneously; Through these three types of acoustoelectric signals are compared analysis; If two kinds and two or more signal exist simultaneously and just can directly judge and have local discharge signal, improved the validity and the reliability of testing result so greatly.
Three, integrated ultra-high-speed data acquisition device of the present invention and low speed data harvester are in one; The ultra-high-speed data acquisition device is a trigger pip with partial discharge pulse's signal; Simultaneously this signal is routed to the low speed data capture card, realize that the collection of high low speed data starts synchronously.Can realize Partial Discharge Detection and Partial Discharge Sources positioning function simultaneously.
Four, the present invention adopts the fast frame acquisition technique; On the whole sampling time; Only gather and contain the waveform segment of partial discharge pulse, and abandon other a large amount of non local discharge pulse Wave datas, can realize the continuous trigger of partial discharge pulse's signal; Guaranteeing to gather under the prerequisite at a high speed, realize the low capacity stores processor of data simultaneously.
Description of drawings
Fig. 1 is the system hardware structure synoptic diagram.
Fig. 2 hypervelocity and the data acquisition of low speed data capture card start synoptic diagram synchronously.
Fig. 3 ultrahigh frequency Primary Location synoptic diagram.
Fig. 4 system software structure and functional diagram.
Fig. 5 localization by ultrasonic Simulation Application.
The detected laboratory simulation discharge PRPD of Fig. 6 system collection of illustrative plates.
Fig. 7 system data processing module interface and laboratory simulation discharge (noisy, interference) testing result.
The GIS of Fig. 8 transformer station local discharge superhigh frequency and high-frequency current detection waveform.
Fig. 9 GIS high-frequency local discharging detection system on-the-spot detection data and processing.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described further, but should limit protection scope of the present invention with this.
According to synchronous detection local discharge superhigh frequency signal in the local discharge electroacoustic united detection method of GIS, the needs of high-frequency current signal and ultrasonic signal, the structure of the local discharge electroacoustic united detection system of GIS of the present invention is as shown in Figure 1.
The local discharge electroacoustic united detection system of a kind of GIS comprises hypervelocity data processing module, low speed data processing module and control analysis module.
The hypervelocity data processing module is through hypervelocity synchronous data collection card, but high-frequency local discharging pulse signal or high-frequency current signal after maximum 4 tunnel process limiter amplitude limits of high speed acquisition and amplifier amplify; The low speed data processing module can be gathered 8 tunnel shelf depreciation ultrasonic signal or power frequency synchronizing signal through the amplifier amplification at most through the low speed data capture card.The high, low speed data collecting card connects trigger pip through the radioshielding line; And with the trigger pip of high-speed data acquisition card output collection enabling signal as the low speed data capture card; Realize the synchronous startup of high low speed data collecting card sampling; The two all is placed in the PXI system chassis, through the control of the controlled analysis module of virtual instrument technique.The shelf depreciation data that data collecting card collects are sent to analysis, storage and the demonstration that the control analysis module realizes data through PCI Express interface (PXI-ExpressCard 8360).
The hypervelocity data processing module
The hypervelocity data processing module is responsible for the coupling and the collection of local discharge superhigh frequency signal and high-frequency current signal.The local discharge superhigh frequency signal is through detecting the uhf sensor coupling that frequency band is 200MHz～1500MHz.Sensor is positioned over the disc insulator outside, GIS cavity partition place, and uses the electrostatic prevention elastic cord to fix.The ultra-high frequency signal that detected amplifies with the back through limiter amplitude limit and amplifier and is connected to high-speed data acquisition card through coaxial cable for high frequency, the longest connection apart from being 15 meters.It is 1MHz～40MHz that High Frequency Current Sensor detects frequency band; Adopt the annular opening form; Can directly be set on the metal connection strap in GIS ground wire or the GIS cavity partition place disc insulator outside, with the high-frequency pulse current signal content of coupling ground current or its check point of being put.The shelf depreciation high-frequency pulse current signal of coupling is inserting the conditioning process of also having carried out filtering and amplification through wave filter and amplifier before the high-speed data acquisition card.This modulate circuit and ultra-high frequency signal modulate circuit integrate, and use lithium battery power supply, to reduce because of being electrically connected the interference of introducing.
The synchronous ultra-high-speed data acquisition card of multichannel is NI-5154, adopts following fast frame technology to gather with the analog bandwidth of the sampling rate that reaches as high as 2GS/s and 1GHz to the signal that connects.
The fast frame technology is that capture card is defined as a frame with partial discharge pulse's fragment, during collection with partial discharge pulse's signal itself as the triggering source, only the partial discharge pulse's frame that is triggered is gathered after the triggering, and is abandoned other non-pulse partial data.Frame length is defaulted as 1 μ s, also revises according to actual pulse length, such as 40 μ s.Because proportion is generally less than 1% on the whole data collection time shaft for partial discharge pulse's signal, the rapid data frame technique can be realized the continuous trigger of partial discharge pulse, high speed acquisition and low capacity stores processor.
The low speed data processing module
The low speed data processing module is responsible for the coupling and the collection of shelf depreciation ultrasonic signal and power frequency component.Ultrasonic signal is the external resonant transducer coupling of 150kHz through the resonance centre frequency; Use ultrasonic coupling agent with the directly sticking GIS chamber outer surface that places of sensor during detection, the ultrasonic signal of coupling is through amplifying and band connection frequency is to send into the low speed data capture card behind the bandpass filtering of 80kHz～200kHz.Partial discharge pulse's signal that power frequency component is mainly collection provides phase reference; It obtains from transformer station's panel box or the power taking of PT secondary side through voltage sensor; The voltage signal of sensing involves relevant adjustment back through low pass filtered and inserts low speed data capture card NI-6133, high sampling rate 2.5MS/s.
The high, low speed data processing module synchronously
As shown in Figure 2; The high-speed data processing module with partial discharge pulse's signal itself as trigger pip; This trigger pip is exported through the trigger pip output port of ultra-high-speed data acquisition card synchronously; This trigger pip is connected to the trigger pip that the low speed data capture card is gathered as low speed data through the high frequency coaxial shielded signal wire, and cable connector adopts SMA (SubMiniature version A) joint.Thereby realize the synchronous startup of high low speed data acquisition.The power frequency component starting phase angle that the low speed data capture card that calculates is thus sampled just can be demarcated the position, phasing degree for the partial discharge pulse's signal place power frequency component that triggers this time sampling.The phasing degree position location computation of partial discharge pulse's signal place power frequency component is as follows:
1, the starting phase angle of calculating sampling power frequency component
And the real-time frequency f of sampling power frequency component, write down the instantaneous moment t that each partial discharge pulse occurs
i, t
0For triggering the instantaneous moment that power frequency component sampling partial discharge pulse occurs.
2, utilize formula (1) to calculate the phasing degree of the partial discharge pulse that then occurs
System software
Computing machine of the present invention is the computing machine that has based on the system software of LabVIEW virtual instrument platform exploitation, and is as shown in Figure 3, contains system configuration, data acquisition and data processing three big modules.
Functions of modules
Acquiescence gets into the system configuration module after the system start-up.This module provides the selection and the import pathway of system configuration parameter for the operator through human-computer interaction interface.What need dispose at first is detecting pattern, and system provides ultrahigh frequency detection, high-frequency current detection, ultrasound detection and three's multiple array configuration selective.After detecting pattern is confirmed, system will dispose correlation parameter automatically, and start sampling.The Wave data that collects is carried out after the pre-service, and system is presented at sample waveform and shelf depreciation amplitude PHASE DISTRIBUTION figure (phase Resolved Partial Discharge the abbreviates the PRPD collection of illustrative plates as) collection of illustrative plates that calculates gained in the interface in real time.In view of the above, system also can carry out manual adjustment to sampling parameter.Adjustable parameter mainly comprises sampling rate, sampling length, triggering level, sample magnitude scope, phase alignment skew etc.In case sampling parameter is adjusted to optimal mode, just can get into data acquisition module through click data acquisition function key.
Data acquisition module is mainly accomplished data acquisition and memory function according to the parameter of system configuration module settings.In the data acquisition, system shows the PRPD collection of illustrative plates and the parameters of sampling in real time, and the monitoring data collection state.The data preservation can select the PRPD spectrum data after original waveform data or the calculating to preserve as required.
Data processing module mainly carries out time domain to the shelf depreciation original waveform data of being gathered, and frequency-domain analysis and shelf depreciation amplitude and PHASE DISTRIBUTION analysis also show correlated results, for the shelf depreciation diagnosis provides foundation.The data processing module interface is as shown in Figure 7: system extracts the time-frequency parameter of partial discharge pulse's waveform: equivalent duration-equivalent frequency range-centre frequency (TWf) is [referring to document 1, A.Cavallini, A.Contin, G.C:Montanari; F.Puletti, " ANew Approach to Diagnosis of Solid Insulation Systems Based on PD Signal Inference ", IEEE Electrical Insulation Magazine; Vol.19, no.32, pp.23-30; April 2003], and, adopt fuzzy clustering method [referring to document 2 as characteristic parameter; Chiu, S., " Fuzzy Model Identification Based on Cluster Estimation; " Journal of Intelligent & FuzzySystems, Vol.2, No.3; Spet.1994.] it is classified,, and in the PRPD collection of illustrative plates, show with differentiation noise, interference and multi-source local discharge signal.
Realize the location
The location of Partial Discharge Sources is an important function of partial discharge detecting system, and native system can be realized based on the amplitude of multichannel ultra-high frequency signal or the time difference, the ultrahigh frequency and the ultrasonic signal time difference, perhaps the multiplex ultrasonic signal time difference location of carrying out.
The time difference based on the energy accumulation method [referring to document 3, Tang Zhiguo, Li Chengrong; Huang Xingquan.The feasibility of locating PD source in transformer using the UHF technology [C] .Electrical Insulation and Dielectric Phenomena; Annual Report Conference, 2004, Boulder; Colorado.] try to achieve, idiographic flow is:
1, calculate the energy accumulation curve of acquired signal,
2, calculate this point of inflexion on a curve, and with its demarcate by initial moment of collection partial discharge pulse,
3, at last that each road sign is the fixed initial moment of shelf depreciation is subtracted each other the time difference that just obtains the multichannel local discharge signal.
Primary Location
1, judge through signal amplitude: after system detected local discharge signal, it was nearer to judge tentatively that through the amplitude of multichannel ultra-high frequency signal relatively Partial Discharge Sources leaves the bigger sensor of amplitude;
2, judge through calculating the ultra-high frequency signal time difference: through comparing the amplitude of ultra-high frequency signal; Judged after the approximate location of shelf depreciation; Propagate into time difference of different uhf sensors through calculating local discharge signal, can be in the meter accuracy scope position of Primary Location Partial Discharge Sources.Computation process is as shown in Figure 4.
In the formula, t
1, t
2Be the ultrahigh frequency pulse signal wave head moment of hypervelocity capture card record, l
1, l
2It is the distance that Partial Discharge Sources arrives uhf sensor 1 and uhf sensor 2.υ is the light velocity, and size is 3*10
8M/s.l
0Be two distances between the uhf sensor.Can obtain the position of Partial Discharge Sources by formula (1), apart from the distance of uhf sensor 1
Accurately locate
According to the result of Primary Location, detect ultrasonic signal near ultrasonic sensor is arranged in Partial Discharge Sources, and then can further locate according to the time difference of ultrasonic signal and ultra-high frequency signal.
Step:
1) on the GIS cavity, pastes 4 ultrasonic sensors, arrange a uhf sensor in the disc insulator outside with ultrasonic coupling agent.And two types of sensors are connected to low speed and ultra-high-speed data acquisition card respectively;
2) position coordinates of four ultrasonic sensors of record;
3) detection starting device image data; The data acquisition of the low speed capture card of pick-up unit starts by the local discharge superhigh frequency signal triggering; As shown in Figure 5, the ultrasonic signal starting point that the time difference of ultrasonic signal and ultra-high frequency signal promptly collects is to the mistiming of ultrasonic pulse signal start-up portion.
Through calculating the time difference between the ultrasonic pulse signal more than 4 tunnel, find the solution ultrasound wave at the uniform velocity the propagation equation group just can obtain discharge source the position [referring to document 4, Philip J.Moore; Iliana E.Portugues, and Ian A.Glover " Radiometric location of partial discharge sources on energized high voltage plant, " IEEE Trans.Power Del.; Vol.20; No.3, pp.2264-2272, Jul.2005.].
On-the-spot more practical method is in detecting shelf depreciation ultrasonic signal process; Calculate the time difference on one side; The position of on one side moving sonac according to the amplitude of ultrasonic signal and the time difference; When the time difference of certain two-way ultrasonic signal was zero, just local discharge signal equated that to the time delay of this two-way ultrasonic signal sensor then discharge source is positioned on the vertical bisector plane of these two sensor line sections.Through repeatedly similarly moving, can obtain more accurate discharge source position.
Application example 1: localization by ultrasonic Simulation Application
In the Simulation Application, the laboratory uses signal generator to produce pulse signal, and simultaneously it is loaded on piezoelectric ceramic piece and the electromagnetic wave emitting antenna, in order to the ultrasound wave and the electromagnetic wave of simulation shelf depreciation generation.During test four ultrasonic sensors are sticked on dull and stereotyped foursquare four summits of insulation with ultrasonic coupling agent; Its coordinate position is shown in Fig. 5 left side, and square catercorner length is 40cm, in assigned address simulation discharge; The discharge ultrasonic signal that Fig. 5 the right is depicted as simulation is positioned at (10; The ultrasonic signal of 4 passages that-10,0) system receives during the position, and the time difference of calculating gained.
Before positioning, the simulation discharge in the true origin position earlier, the time delay of calibrating 4 paths, and then the discharge in (40,0,0) position are calculated the velocity of propagation of ultrasound wave on flat board.Asking for the actual measurement velocity of propagation on the basis of considering channel time delay of simulation discharge position uses the grid search method [referring to document 5, Chang Wenzhi; Tang Zhiguo; Li Chengrong, Wang Hao, inteilectual Zheng. the analysis of experiments of transformer partial discharge ultra wideband radio-frequency location technology [J] High-Voltage Technology; 2010, (08)] try to achieve.The discharge position coordinate is (10 ,-11,0), and error is less than 2cm.
Application example 2: laboratory simulation discharge examination
Testing laboratory uses signal generator to produce the 50Hz sinusoidal signal and detects on-the-spot power frequency component in order to emulation, produces and the synchronous pulse signal of power frequency component afterwards through it being carried out phase shift and shaping simultaneously, and this pulse signal is connected to emitting antenna.Local discharge superhigh frequency and power frequency component by the said method simulation carry out analog detection through system of the present invention.
Fig. 6 is the testing result of simulation discharge pulse system of the present invention when simulation power frequency component 90 degree and position, 270 degree phasing degree.
Fig. 7 is that the check and analysis result that system data processing module software interface of the present invention shows is put after the simulating signal introducing noise in office.
Application example 3: Partial Discharge Detection rig-site utilization
System of the present invention finds that partly there is local discharge signal in this station GIS 220kV when the on-the-spot test of certain 500kV GIS transformer station.Fig. 8 is the local discharge superhigh frequency pulse and the high-frequency current pulse original waveform of system environment recording of the present invention.
Fig. 9 is this 500kV GIS transformer station local discharge superhigh frequency testing result.The PRPD collection of illustrative plates of the left side for calculating, top, the right is divided into time-frequency parameter TW two-dimensional map, and bottom, the right is divided into the discharge pulse original signal of index.Can know that from the discharge pulse original signal this station discharge signal is obvious, the discharge amplitude is about 3 times of ground unrest, and the fact of discharging and existing has also been verified in detecting of high-frequency current signal.Distribution characteristics through the PRPD collection of illustrative plates: discharge concentrates near power frequency component 90 degree and the 270 degree phasing degree, and the discharge amplitude is equal basically, is judged as the floating potential discharge.Through relatively in the time difference of different disc insulator strength of discharges and ultra-high frequency signal, preliminary judgement discharge belong to the air chamber position, but because of not detecting ultrasonic signal, the success of failing is accurately located.
Claims (10)
1. local discharge electroacoustic united pick-up unit of portable GIS is characterized in that this device hardware comprises hypervelocity data processing module, low speed data processing module and control analysis module:
Described hypervelocity data processing module comprises ultra-high frequency signal treatment circuit, high-frequency current treatment circuit; The ultra-high frequency signal sensor groups of described ultra-high frequency signal treatment circuit links to each other with the input end of amplifier with hypervelocity synchronous data collection card through the ultra-high frequency signal limiter, and the High Frequency Current Sensor of described high-frequency current treatment circuit links to each other through the input end of high-frequency current signal amplifier with described multichannel hypervelocity synchronous data collection card;
Described low speed data processing module comprises ultrasonic signal treatment circuit and power frequency component treatment circuit; The ultrasonic signal sensor groups of described ultrasonic signal treatment circuit links to each other through the input end of ultrasonic signal amplifier with the multi-path low speed data collecting card, and the power frequency component sensor of described power frequency component treatment circuit links to each other through the input end of power frequency component wave filter with described multi-path low speed data collecting card;
Described multichannel hypervelocity synchronous data collection card is connected by the radioshielding line with described multi-path low speed data collecting card trigger pip interface;
Described multichannel hypervelocity synchronous data collection card and described multi-path low speed data collecting card are installed in the same PXI frame; Connect through the data bus in the frame; And be connected with described control analysis module through PCI Express interface; Described control analysis module is controlled described multichannel hypervelocity synchronous data collection card and described multi-path low speed data collecting card, and the data of its collection are carried out Treatment Analysis, storage and demonstration.
2. the local discharge electroacoustic united pick-up unit of portable GIS according to claim 1; The detection frequency band that it is characterized in that described ultra-high frequency signal sensor is 200MHz～1500MHz; The detection frequency band of described High Frequency Current Sensor is 1MHz～40MHz; The resonance centre frequency of described ultrasonic signal sensor is 150kHz, the added power-frequency voltage signal of described power frequency component sensors coupled shelf depreciation test product.
3. the local discharge electroacoustic united pick-up unit of portable GIS according to claim 1; It is characterized in that described hypervelocity data processing module with partial discharge pulse's signal itself as trigger pip; This trigger pip is through the trigger pip port output of ultra-high-speed data acquisition card; Export described low speed data capture card to through high frequency coaxial shielded signal line locking, the trigger pip of gathering as low speed data simultaneously.
4. the local discharge electroacoustic united pick-up unit of portable GIS according to claim 1; It is characterized in that described control analysis module is a computing machine that has based on the system software of LabVIEW virtual instrument platform exploitation, described software comprises system configuration module, data acquisition module and data processing module three parts:
Described system configuration module mainly is selection and the import pathway that system configuration parameter is provided for the operator through human-computer interaction interface: what need dispose at first is detecting pattern, and system provides ultrahigh frequency detection, high-frequency current detection, ultrasound detection and three's multiple array configuration selective; After detecting pattern was confirmed, computing machine disposed correlation parameter with automatic or manual, comprised sampling rate, sampling length, triggering level, sample magnitude scope, phase alignment skew;
Described data acquisition module is mainly accomplished data acquisition and memory function according to the parameter of system configuration module settings: in the data acquisition, system shows the original waveform and the data of sampling in real time, and the monitoring data collection state; The data preservation can be selected the PRPD spectrum data after original waveform data or the calculating as required;
Described data processing module mainly carries out time domain to the shelf depreciation original waveform data of being gathered, and frequency domain, amplitude and PHASE DISTRIBUTION analysis also show correlated results, for the shelf depreciation diagnosis provides foundation.
5. a detection method of utilizing the local discharge electroacoustic united detection system of described GIS to carry out Partial Discharge Sources is characterized in that this method comprises the following steps:
1., according to the ambient conditions and the detecting pattern of transformer station's gas-insulated switch to be measured; Rationally lay ultra-high frequency signal sensor, High Frequency Current Sensor, the ultrasonic signal sensor of the local discharge electroacoustic united detection system of described GIS, carry out being connected of system's miscellaneous part setting and circuit;
2., after the system start-up; Described system software acquiescence gets into the system configuration module; This system configuration module is through the systematic parameter configuration interface; Supply the operator to select detecting pattern with interactive means, system provides ultrahigh frequency detection, high-frequency current detection, ultrasound detection and three's multiple array configuration selective; After detecting pattern is confirmed, system will dispose automatically or with interactive means manual adjustment sampling parameter, mainly comprise sampling rate, sampling length, triggering level, sample magnitude scope, phase alignment skew, and system configuration is accomplished;
3. after system configuration is accomplished; Click data is gathered the sampling of key log-on data: described control analysis module starts corresponding sensor and carries out synchro measure, and the output terminal of described multichannel hypervelocity synchronous data collection card and the output terminal of described multi-path low speed data collecting card import the Wave data of being gathered into described control analysis module respectively through system data bus and PCI Express interface;
4., described data analysis processing module is carried out time domain to the shelf depreciation original waveform data of being gathered; Frequency-domain analysis and shelf depreciation amplitude and PHASE DISTRIBUTION analysis; And the shelf depreciation amplitude PHASE DISTRIBUTION collection of illustrative plates of gained is presented in the interface in real time, for the diagnosis and the location of Partial Discharge Sources provides foundation.
6. detection method according to claim 5; It is characterized in that described ultra-high-speed data acquisition; Adopt the fast frame acquisition technique, pulse waveform is put as a sample frame, on the whole sampling time in office; Only gather and contain the waveform segment of partial discharge pulse, and abandon other a large amount of non local discharge pulse Wave datas.
7. detection method according to claim 5; The diagnostic method that it is characterized in that described Partial Discharge Sources is: after the local discharge electroacoustic united detection system operate as normal of described GIS begins; Described computing machine receives two kinds and above signal in high-frequency pulse signal, high-frequency current signal and the ultrasonic signal of described ultra-high frequency signal sensor, High Frequency Current Sensor, ultrasonic signal sensor simultaneously through hypervelocity data processing module, low speed data processing module, can judge directly that there is shelf depreciation in transformer station to be measured gas-insulated switch.
8. detection method according to claim 5; The localization method that it is characterized in that described Partial Discharge Sources; Be based on that amplitude or the time difference, ultrahigh frequency and the ultrasonic signal time difference or the multiplex ultrasonic signal time difference of the multichannel ultra-high frequency signal of native system position; The described time difference tries to achieve based on the energy accumulation method, and the location of described Partial Discharge Sources comprises Primary Location and accurately locatees.
9. detection method according to claim 8 is characterized in that described Primary Location method comprises
1. judge through signal amplitude: after system detected local discharge signal, it was nearer to judge tentatively that through the amplitude of multichannel ultra-high frequency signal relatively Partial Discharge Sources leaves the bigger sensor of amplitude;
2. judge through calculating the ultra-high frequency signal time difference: through comparing the ultra-high frequency signal amplitude; Judged after the approximate location of shelf depreciation; Propagate into time difference of different uhf sensors through calculating local discharge signal, can be in the meter accuracy scope position of Primary Location Partial Discharge Sources.
10. detection method according to claim 8; The accurate positioning method that it is characterized in that described Partial Discharge Sources is the result of Primary Location according to claim 9; Detect ultrasonic signal near ultrasonic sensor is arranged in Partial Discharge Sources, further locate according to the time difference of ultrasonic signal and ultra-high frequency signal.
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| CN2011103300428A CN102435922A (en) | 2011-10-26 | 2011-10-26 | Acoustic-electric combined detection system and positioning method for GIS (Gas Insulated Switchgear) local discharge |
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| CN2011103300428A CN102435922A (en) | 2011-10-26 | 2011-10-26 | Acoustic-electric combined detection system and positioning method for GIS (Gas Insulated Switchgear) local discharge |
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