CN108710074A - A kind of partial discharge of switchgear detecting system based on Radio Transmission Technology - Google Patents

A kind of partial discharge of switchgear detecting system based on Radio Transmission Technology Download PDF

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Publication number
CN108710074A
CN108710074A CN201810955824.2A CN201810955824A CN108710074A CN 108710074 A CN108710074 A CN 108710074A CN 201810955824 A CN201810955824 A CN 201810955824A CN 108710074 A CN108710074 A CN 108710074A
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CN
China
Prior art keywords
partial discharge
sensor
switchgear
radio transmission
transmission technology
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CN201810955824.2A
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Chinese (zh)
Inventor
邬蓉蓉
朱时阳
吕泽承
苏毅
张炜
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Electric Power Research Institute Guangxi Power Grid Co Ltd
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Electric Power Research Institute Guangxi Power Grid Co Ltd
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Priority to CN201810955824.2A priority Critical patent/CN108710074A/en
Publication of CN108710074A publication Critical patent/CN108710074A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1209Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Abstract

The partial discharge of switchgear detecting system based on Radio Transmission Technology that the invention discloses a kind of, including terminal and host, the terminal includes the sensor assembly being sequentially connected in series, conditioning module, V/f conversion modules 1 and wireless sending module, the host includes the wireless receiving module being sequentially connected in series, V/f conversion modules 2, wave detector, smoothing filter, envelope generator, peak detector, A/D converter and central processing unit, and memory, alarm, display unit and the man-machine interaction unit being connect respectively with the central processing unit.The present invention synchronizes detection to multi-signals such as hyperfrequency, ultrasonic wave, high-frequency current, TEV, power frequency component and vibrations, and switchgear interior insulation state is carried out a variety of transducing signal comprehensive analysis, mutually confirms, improves the accuracy for judging that partial discharge occurs.Detection signal is transmitted to host in particular by wireless mode, tester has been liberated, has avoided the dilatory of live line, improve safety, the reliability of test.

Description

A kind of partial discharge of switchgear detecting system based on Radio Transmission Technology
Technical field
The invention belongs to technical field of electric power more particularly to a kind of partial discharge of switchgear inspections based on Radio Transmission Technology Examining system.
Background technology
High-tension switch cabinet is the switchgear that quantity is most huge in electric system, carries the duty directly to customer power supply Can, operating status is directly related to customer power supply reliability.For switchgear, in longtime running inevitably Because aging, make moist, mechanical damage etc. leads to insulation degradation the case where.According to statistics, the platform of accident is caused by switchgear insulation degradation It is secondary to account for the 74% of 68% and the accident total capacity that switch total casual clearing station time.But the development of repair based on condition of component and the requirement of power supply reliability It is difficult the interruption maintenance that the period is carried out to power equipment, discovering device defect to make people.The stable operation of switchgear is related to whole The safety and stability of a power grid, and shelf depreciation will not generally lead to the connectivity breakdown of insulation in switchgear, but electric Jie can be caused The local damage of matter and the electrical strength of insulation dielectric reduce, i.e., shelf depreciation is a slow to the destruction of insulator arrangement Evolution also results in the increase of shelf depreciation number and discharge capacity, so with insulator arrangement and dielectric damage Form a vicious circle.Therefore, seem necessary to the monitoring of shelf depreciation in switchgear, not only increase the confession of power grid Electric safety, while also positive facilitation is played for the construction of intelligent grid.
The shelf depreciation of switchgear can generally relate to various features signal, such as TEV (electric wave) signal, electromagnetic radiation letter Number and ultrasonic signal etc..In test by the contrast test to any of the above signal whether generation to determine partial discharge.Often It needs to multi-signal alternately testing, it is desired to be able to which mutually confirmation to judge whether partial discharge of switchgear occurs, and determines office Size high-volume.Transformative transducer or test equipment are needed in test, this on-the-spot test brings constant, also influence test Precision.
Not necessarily persistently occur due to the generation of partial discharge, there is the possibility discontinuously occurred, is surveyed when with a kind of sensor After the completion of examination, then a kind of sensor or instrument test are changed, perhaps will lose discharge information, this is one;Also it is exactly such as Fruit measures these three signals respectively, then can't see the correlation of these three signals when partial discharge occurs;The electric discharge of different instrument tests Signal just has difference due to the difference of hardware circuit design, the difference of data processing method, the feature of discharge signal.These because Element can all influence that partial discharge detection is handled as a result, causing certain difficulty to making accurate judgment.
Invention content
It is an object of the invention to overcome deficiency in the prior art, a kind of collection superelevation based on Radio Transmission Technology is provided Frequently (UHF) sensor, ultrasonic wave (AE) sensor, high-frequency current (HFCT) sensor, TEV sensors, power frequency component sensing The partial discharge of switchgear detecting system that device and vibrating sensor are integrated, can support hyperfrequency, ultrasonic wave, high-frequency current, The detection of the multi-signals such as TEV, power frequency component and vibration carries out multi-channel synchronous to the Partial Discharge Data of same switchgear and adopts Collection, meets the actual demand of Site Detection.
To achieve the above object, the technical solution adopted by the present invention is:
A kind of partial discharge of switchgear detecting system based on Radio Transmission Technology, including terminal and host, the terminal include Sensor assembly, conditioning module, V/f conversion modules 1 and the wireless sending module being sequentially connected in series, the host include successively Wireless receiving module, V/f conversion modules 2, wave detector, smoothing filter, envelope generator, the peak detection being connected in series with Device, A/D converter and central processing unit, and the memory, alarm, the display unit that are connect respectively with the central processing unit And man-machine interaction unit, the signal that the conditioning module is used to pick up the sensor assembly carry out at noise reduction and amplification Reason, the terminal and host are carried out wireless communication with wireless receiving module by the wireless sending module and are connect.
Preferably, the sensor assembly is hyperfrequency (UHF) sensor, ultrasonic wave (AE) sensor, high-frequency current (HFCT) one or more of sensor, TEV sensors, power frequency component sensor and vibrating sensor.
Preferably, the power frequency component sensor directly extracts required work from the 110V power supplys or PT secondary sides of substation Frequency signal provides phase synchronized signal to the partial discharge of switchgear detecting system after treatment.
Preferably, the TEV sensors are the bilayer copper clad plate of 1mm thickness, and operational mode is capacitance coupling type, is picked up The frequency range of signal is 3 ~ 100MHz, amplitude measurement ranging from 0 ~ 60dBmV, resolution ratio 1dB.
Preferably, the ultrasonic sensor is R15I-AST Sensor sonacs or piezoelectric type water proof type ultrasound Sensor 40RS/UT180, working frequency 80-200kHz, centre frequency 40kHz, amplitude measurement ranging from 0 ~ 60dBuV, Resolution ratio is 1dB.
Preferably, hyperfrequency (UHF) sensor is microstrip-type sensor.
Preferably, the conditioning module includes filter and amplifier.
Preferably, the signal gain of the amplifier is 40dB.
Preferably, the filter when being filtered using the karr filter method based on wavelet analysis.
Preferably, the time constant of the smoothing filter is 1 μ s.
Benefit of the invention is that:
(1)Detection, and root are synchronized to multi-signals such as hyperfrequency, ultrasonic wave, high-frequency current, TEV, power frequency component and vibrations It can automatically switch according to demand, switchgear interior insulation state is subjected to a variety of transducing signal comprehensive analysis, is mutually confirmed, is improved and sentence The accuracy that disconnected partial discharge occurs;
(2)Detection signal is transmitted to host using wireless mode, tester has been liberated, has avoided the dilatory of live line, carry The high safety of test, reliability.
(3)Have using wireless way for transmitting signal, between survey crew and high voltage installation it is good be isolated, make equipment and The safety of survey crew can be guaranteed, while there is no the equivalent sex chromosome mosaicisms of online result and offline result;
(4)Increase power frequency component sensor, for providing the synchronous reference phase needed for signal detection;
(5)Using the karr filter method based on wavelet analysis, the to the maximum extent influence of wiping out background noise;
(6)By increasing smoothing filter, avoids noise spike and enter envelope generator and peak detector, and by high frequency The influence of noise;
(7)The envelope curve that the signal that shelf depreciation generates is obtained by using wave detector and envelope generator, recycles peak It is worth detector extraction signal peak and phase property amount, greatly reduces the data volume of data processing and acquisition, effectively reduce The complexity of system itself and its requirement to communication bandwidth, host processing power;
(8)Multigroup part is carried out in different location to the same switchgear by multiple and different partial discharge detecting sensors respectively Discharge examination carries out multichannel collecting since these sensors are in same environment to the Partial Discharge Data of same switchgear, Testing result has across comparison;
(9)Since sensor may be disposed at the inside of switchgear, outside environmental elements can be effectively avoided to be influenced caused by it, It will not be limited by optics and infrared measurement of temperature, also not need loophole, improve the accuracy of testing result;
(10)Testing result fully digitalization shows that interface is more intuitive, succinct, full-featured;
(11)The signal picked up to sensor using V/f conversion modules is converted, can effectively limiting circuitry temperature to small electric The influence of signal transmission is pressed, error is reduced.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
Specific implementation mode
A kind of partial discharge of switchgear detecting system based on Radio Transmission Technology, as shown in Figure 1, the system comprises ends End and host, the terminal include the sensor assembly being sequentially connected in series, conditioning module, V/f conversion modules 1 and wireless transmission Module, the host include the wireless receiving module being sequentially connected in series, V/f conversion modules 2, wave detector, smoothing filter, packet Winding thread generator, peak detector, A/D converter and central processing unit, and deposited respectively with what the central processing unit was connect Reservoir, alarm, display unit and man-machine interaction unit, the letter that the conditioning module is used to pick up the sensor assembly Number carry out noise reduction and enhanced processing, the terminal and host carried out by the wireless sending module and wireless receiving module it is wireless Communication connection.
The sensor assembly is mainly used for picking up the various detection signals inside and outside switchgear, including hyperfrequency (UHF) passes Sensor, ultrasonic wave (AE) sensor, high-frequency current (HFCT) sensor, TEV sensors, power frequency component sensor and vibration pass One or more of sensor.Wherein:
Hyperfrequency (UHF) sensor is microstrip-type sensor, 110V power supply of the power frequency component sensor from substation Or PT secondary sides directly extract required power frequency component, provide phase to the partial discharge of switchgear detecting system after treatment Bit synchronization signal.It is provided with zero cross detection circuit in power frequency component sensor, is marked for the zero crossing to synchronizing voltage, The output token signal in a manner of impulse wave again is recorded with the phase to local discharge signal.
The TEV sensors are the bilayer copper clad plate of 1mm thickness, and operational mode is capacitance coupling type, institute's pickoff signals Frequency range be 3 ~ 100MHz, amplitude measurement ranging from 0 ~ 60dBmV, resolution ratio 1dB.
R15I-AST Sensor sonacs or piezoelectric type water proof type ultrasonic sensing can be used in the ultrasonic sensor Device 40RS/UT180, working frequency 80-200kHz, centre frequency 40kHz, amplitude measurement ranging from 0 ~ 60dBuV are differentiated Rate is 1dB, makes full use of the selecting frequency characteristic of ultrasonic sensor itself to reduce the complexity of circuit.
The correct position for placing sensor on switchgear is selected to be important.Its basic principle is all independent gas chambers At least necessary there are one measurement points, this is because insulator and flange make signal obviously decay;Have one between each two flange A measurement point is also necessary;According to the place selection measurement point that may have particle, usually they are towards possible minimum in gas chamber Point movement.General the most useful position includes:
Disconnecting switch:In disconnecting switch, there may be free metal particle, other moving components may also generate for contact Grain;
Earthing switch:It is similar with disconnecting switch;
Breaker:Moving component may generate particle;
Isolated insulation/the insulator being horizontally mounted:Vertical disconnecting switch and shell has the insulator being horizontally mounted, particle It is likely to remain on these insulators and generates partial discharge.
During atual detection, the position of hyperfrequency (UHF) sensor can be placed in cabinet door gap connected to the cabinet body On the front window or rear window of place or switchgear, there is shielding action to electromagnetic wave since switchgear is a metal cabinet according to experiment, Therefore hyperfrequency (UHF) sensor is placed at cabinet door gap connected to the cabinet body or on the front window or rear window of switchgear, neither The receiving of signal is interfered, and can be to avoid the interference of other signals.If hyperfrequency (UHF) sensor is placed in switchgear, Sensor should use planar equiangular spiral antenna, and the signal frequency range of detection is 300MHZ-2GHZ.And high-frequency current (HFCT) sensor should be placed in switch cabinet bus side ground wire, while should be separately installed with ultrasonic wave at four angles of switchgear Sensor.Other sensors then can need to be moved to different positions according to above-mentioned principle and detection.
Conditioning module is mainly used for that the signal that sensor assembly picks up is amplified and is filtered, to reduce due to depositing Error caused by serious interface decaying is caused in air borne medium, and resists the interference of various ambient noises.Including Filter and amplifier.Due to each signal how much all can some background noises, the purpose of filter is to remove low frequency and height Frequency noise.Since high frequency attenuation is more serious than low cut when signal is propagated in switchgear, with the method for increasing lower frequency limit, make It is partial discharge on center conductor that user, which can identify,(Signal is obviously decayed).If including low-frequency noise in signal, increasing can be passed through Big lower frequency limit excludes.The frequency range of Partial discharge signal is in 20kHz to 80kHz, may if the frequency of ambient noise is higher Higher lower frequency limit is needed, partial discharge cannot be measured in this way, but still can measure and detect the particle of bounce.It simultaneously can be with High-frequency Interference is excluded by adjusting upper limiting frequency, preferably filters off most of high frequency noise without making original signal by too big Loss, it is proposed that be set as 100 kHz.Filter function in the present embodiment is completed by bandpass filter, and using based on small echo The karr filter method of analysis.The lower frequency limit of low pass is 10kHz, and maximum frequency is 500kHz, and the default of lower frequency limit is set It is 10kHz to set, and the default setting of upper limiting frequency is 100kHz, can thus filter out the influence of back of the body noise to the maximum extent.Together When, data are handled by the way of filtering, are conducive to the authenticity for improving data.
The gain setting of amplifier is critically important when detection.The gain for such as setting 60dB can not have better sensitivity, because It is all simultaneously amplified for background noise and sensor signal level, it means that signal is independently of gain to the ratio of noise Constant.When using 40dB gains, under continuous mode the cycle peak level of ambient noise usually in 0.4mV-1mV, so, inspection Recommend gain selection in 40dB when survey, so that it may to avoid jammer signal.
The sensor acquisition of this six type of the present invention is different types of signal, and each advantageous, it is possible to Learn from other's strong points to offset one's weaknesses.For example, TEV sensors and uhf sensor have higher sensitivity, can be examined having faint electric discharge It measures, but the noise of live some electromagnetic interferences sometimes simultaneously, it is that cannot sentence only to lean on TEV sensors and uhf sensor It is disconnected that shelf depreciation whether occurs, therefore secondary-confirmation can be carried out with ultrasonic sensor.In addition, TEV signals and hyperfrequency Signal is the signal of different frequency, and the monitoring frequency of TEV signals is relatively low, and the monitoring frequency of ultra-high frequency signal is relatively high, Electric discharge for single not necessarily can all generate both discharge signals, therefore can more accurately using both methods Detect electric discharge.Ultrasonic wave is compared with TEV and hyperfrequency has certain advantage in terms of positioning simultaneously, but because the velocity of sound is significantly lower than The velocity of wave of electromagnetic wave, therefore first signal that can be monitored using TEV or ultra-high frequency signal is as when the starting of electric discharge It carves, carries out shelf depreciation point location.
V/f conversion modules are used to applied signal voltage being converted into corresponding frequency signal.V/f conversion modules 1 and V/f turn Mold changing block 2 is mainly used for carrying out pressing/frequency transformation to the signal after conditioning.Since the voltage signal of sensor pickup is smaller, warp It is easy to be influenced by line temperature when crossing line transmission, leads to error.If transmitted again after overvoltage/frequency converts, effect is just Can be improved significantly.In addition, sensor signal counts through microcontroller after overvoltage/frequency converts, facilitates computer to sensor Sampling, carry out Computer signal processing.Meanwhile the circuit ratio A/D conversions of V/f conversions are simple.V/f moduluss of conversion are selected herein Block is mainly the transmission for facilitating sensor signal.In this implementation process, V/f conversion modules 1 and V/f conversion modules 2 may be selected The TC9401 types of Telcom companies and the AD650 types of ADI companies, both models be not only operable with V/f patterns, but also can work In f/V patterns.
Wireless sending module is for sending the transformed signals of V/f, and the wireless receiving module in host is used for It receives the signal sended over from terminal and is sent into V/f conversion modules 2 and accordingly converted.In the present embodiment, the wireless hair Send module and wireless receiving module that JN5139 chips can be used.
Wave detector carries out detection to 2 transformed signal of V/f conversion modules.Audio signal or vision signal are believed from high frequency Number(Radio wave)In separate and cry demodulation, also cry detection.The demodulation abbreviation detection of amplitude modulation, effect is from amplitude tune Distortionless detection modulated signal is come in wave processed.According to whether synchronizing signal, detection can be divided into synchronous detection and envelope inspection Wave.
The detection of broad sense commonly referred to as demodulates, and is the inverse process of modulation, i.e., extracts the process of modulated signal from modulated wave.It is right It is the process that modulated signal is extracted from its amplitude variations for amplitude-modulated wave;It is the frequency change detection tune from it to frequency-modulated wave The process of signal processed;It is the process that modulated signal is extracted from its phase change to phase-modulated wave.The detection of narrow sense refers to from amplitude modulation The process of the envelope extraction modulated signal of wave.Sometimes this detection is called envelope detection or amplitude detection.The principle of detection is: Amplitude-modulated wave is first allowed to pass through wave detector, to obtain the pulsating current according to amplitude-modulated wave envelope variation, using a low-pass filter Radio-frequency component is filtered off, the modulated signal of reflection amplitude modulation wave envelope is just obtained.
Signal additionally uses envelope generator and peak detector for information about in order to obtain.In wave detector and envelope It is smoothing filter between line generator, quickly due to envelope generator and peak detector response, and can be by high-frequency noise Influence, especially when the pulse duration is short, such as amplifier noise.Under normal conditions need not be smooth, but at certain In the case of a little higher sensitivity can be obtained using smooth signal.Smothing filtering is a kind of arithmetic mean of instantaneous value generator, if flat It is sliding high, then the result is that the arithmetic mean of instantaneous value of input signal.The smothing filtering of signal has clipped some highest frequencies of signal, and handle The spike of signal removes, for example, amplifier noise.The time constant of smoothing filter must be adjusted to the upper limit frequency of filter Rate, to make it not have much affect frequency response and peak value measurement.When 1 μ s of smothing filtering time constant, 1 can be filtered off MHz frequencies above.
The effect of envelope generator is the signal generated at the top of track smoothing filter circuit output signal, and the signal is at any time Between constant attenuation, time constant directly affects the measurement of envelope frequency component, which should be arranged in this way:Even if Envelope to track peak value excessive without making to fall between peak value, while can not be too slow.In other words, envelope is to inspection The measurement of wave and filtered signal peak.Be arranged it is necessary when suitable time constant because it can influence frequency component It measures.
The signal of peak detector envelope works, and there are two identical peak detectors, and one when pulse is opened the door Interior work is used for the amplitude and phase diagram of detected envelope line, another is measured in 25ms or 75 ms, continuously to be surveyed The cycle peak of amount mode.
A/D converter connects the output end of the peak detector, and the partial discharge feature for exporting peak detector is believed Number it is converted into digital signal.Although the circuit ratio V/f conversion circuits of A/D conversions are complicated, its precision is higher than V/f conversion electricity Road, so, select A/D converter that can improve precision of the system to data processing herein.
Central processing unit connects A/D converter output end, and the digital signal for exporting A/D converter carries out data point Analysis and processing.In the present embodiment, the central processing unit is using AMD series, concrete model A6-7310.
Memory is connected with central processing unit, treated for storing central processing unit result data.
Alarm is connected with central processing unit, when testing result exceeds parameter preset, is issued by hydropac.
Display unit connects central processing unit, data that treated for showing central processing unit.In the present embodiment, institute It states display unit and STN dot-matrix liquid crystal display modules may be used.
Man-machine interaction unit connection connection central processing unit, for detection pattern, parameter to be configured and selected.
To extend the function of this system, the host can be connected by wired or wireless way with computer, by Host Detection Obtained data transmission recycles the power of computer to carry out subsequent processing to computer.
The present invention synchronizes inspection to multi-signals such as hyperfrequency, ultrasonic wave, high-frequency current, TEV, power frequency component and vibrations It surveys, and can automatically switch according to demand, switchgear interior insulation state is subjected to a variety of transducing signal comprehensive analysis, is mutually confirmed, Improve the accuracy for judging that partial discharge occurs.Detection signal is transmitted to host in particular by wireless mode, has liberated tester Member avoids the dilatory of live line, improves safety, the reliability of test.

Claims (10)

1. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology, it is characterised in that:Including terminal and host, The terminal includes the sensor assembly being sequentially connected in series, conditioning module, V/f conversion modules 1 and wireless sending module, described Host includes the wireless receiving module being sequentially connected in series, V/f conversion modules 2, wave detector, smoothing filter, envelope generation Device, peak detector, A/D converter and central processing unit, and connect respectively with the central processing unit memory, alarm Device, display unit and man-machine interaction unit, the signal that the conditioning module is used to pick up the sensor assembly drop It makes an uproar and enhanced processing, the terminal and host carries out wireless communication company by the wireless sending module and wireless receiving module It connects.
2. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 1, feature It is:The sensor assembly is hyperfrequency (UHF) sensor, ultrasonic wave (AE) sensor, high-frequency current (HFCT) sensing One or more of device, TEV sensors, power frequency component sensor and vibrating sensor.
3. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 2, feature It is:The power frequency component sensor directly extracts required power frequency component, warp from the 110V power supplys or PT secondary sides of substation It crosses after processing and provides phase synchronized signal to the partial discharge of switchgear detecting system.
4. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 2, feature It is:The TEV sensors are the bilayer copper clad plate of 1mm thickness, and operational mode is capacitance coupling type, the frequency of institute's pickoff signals Ranging from 3 ~ 100MHz, amplitude measurement ranging from 0 ~ 60dBmV, resolution ratio 1dB.
5. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 2, feature It is:The ultrasonic sensor is R15I-AST Sensor sonacs or piezoelectric type water proof type sonac 40RS/UT180, working frequency 80-200kHz, centre frequency 40kHz, amplitude measurement ranging from 0 ~ 60dBuV, resolution ratio For 1dB.
6. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 2, feature It is:Hyperfrequency (UHF) sensor is microstrip-type sensor.
7. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 1, feature It is:The conditioning module includes filter and amplifier.
8. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 7, feature It is:The signal gain of the amplifier is 40dB.
9. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 7, feature It is:The filter is when being filtered using the karr filter method based on wavelet analysis.
10. a kind of partial discharge of switchgear detecting system based on Radio Transmission Technology according to claim 1, feature It is:The time constant of the smoothing filter is 1 μ s.
CN201810955824.2A 2018-08-21 2018-08-21 A kind of partial discharge of switchgear detecting system based on Radio Transmission Technology Pending CN108710074A (en)

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CN110780162A (en) * 2019-10-10 2020-02-11 国网天津市电力公司电力科学研究院 Method for extracting partial discharge signal of primary and secondary fusion power distribution switch and detection device
CN110703080A (en) * 2019-10-16 2020-01-17 河海大学 GIS spike discharge diagnosis method, discharge degree identification method and device
CN110780197A (en) * 2019-11-13 2020-02-11 荆门市遥锐机电科技有限公司 Motor running state monitoring system

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Application publication date: 20181026