CN104808123B - A kind of partial discharge of switchgear detecting system - Google Patents
A kind of partial discharge of switchgear detecting system Download PDFInfo
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- CN104808123B CN104808123B CN201510215098.7A CN201510215098A CN104808123B CN 104808123 B CN104808123 B CN 104808123B CN 201510215098 A CN201510215098 A CN 201510215098A CN 104808123 B CN104808123 B CN 104808123B
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Abstract
A kind of partial discharge of switchgear detecting system, for realizing the accurate detection and positioning of partial discharge of switchgear, its technical scheme is, the system includes tablet personal computer, data collecting card, TEV sensors, uhf sensor and four ultrasonic sensors, the TEV sensors, uhf sensor and four ultrasonic sensors are respectively arranged in the different parts on switch cubicle surface, the different inputs of their signal output termination data collecting card, the signal output termination tablet personal computer of the data collecting card, the tablet personal computer is connected by wireless network with host computer.The present invention carries out combined monitoring using three kinds of sensors having complementary advantages to partial discharge of switchgear, not only it is possible to prevente effectively from being disturbed caused by live complex environment, improve Detection accuracy, and the detection level for being accurately positioned for Partial Discharge Sources and accurately identifying for discharge mode, substantially increasing partial discharge of switchgear can be realized.
Description
Technical field
Partial discharge position and the device of type in high-tension switch cabinet can be accurately detected the present invention relates to a kind of, is belonged to out
Close technical field.
Background technology
High-tension switch cabinet is very important electrical equipment in power system, and its operational reliability directly affects whole system
The safety and stablization of system.Due to reasons such as manufacturing process, the insulation of high-tension switch cabinet in the process of running can gradual aging, cause
Generation partial discharge phenomenon, the continuous sprawling and development of this electric discharge, the deterioration of insulation can be accelerated in turn, it is serious so as to cause
Accident of power supply, therefore study partial discharge of switchgear detection technique to improve power supply reliability it is significant.
Method for detection of partial discharge of switch cabinet widely used at present has hyperfrequency method（UHF）, supercritical ultrasonics technology（AE）, transient state
Ground upstream band（TEV）Deng the achievable not outage detection of above-mentioned three kinds of methods.Hyperfrequency method is to receive local put using sensor
Hyperfrequency caused by electricity (300MHz-3GHz) electromagnetic signal, capable detection is put into play a game according to hyperfrequency electromagnetic signal, due to logical
Normal interference signal frequency is all in below 300MHz, therefore this method has more outstanding interference free performance, but due to scene
Environment is complex, and at present there has been no the corresponding standard of formulation, therefore this method can not quantify the size of partial discharge quantity.It is super
Sonic method is the ultrasonic wave according to caused by occurring sharp impacts for molecule in shelf depreciation region（Centre frequency is generally 40KHz）Come
Detecting shelf depreciation, this method biggest advantage is not by interference electrically, and has an accurate stationkeeping ability, but by
Complex in switch cabinet structure, ultrasonic wave has decay and catadioptric in communication process, easily causes and fails to judge or judge by accident.
When TEV methods are by sensing shelf depreciation, the caused transient state on the metal safe face of switch cubicle of electromagnetic wave caused by discharge pulse
Voltage-to-ground detects shelf depreciation, and this method can quantify to shelf depreciation, but can not avoid a large amount of electricity at scene
Magnetic disturbance, have some limitations.
Positioning for partial discharge of switchgear typically uses " sound-sound " method, because inside switch cabinet insulation system is complicated,
Ultrasonic wave produces decay, therefore larger position error often occurs in this method.
In view of the above method cuts both ways, it is therefore necessary to a kind of joint-detection and positioner are developed, it is existing to make up
The deficiency of method, realize the accurate detection and positioning of partial discharge of switchgear.
The content of the invention
It is an object of the invention to the drawback for prior art, there is provided a kind of partial discharge of switchgear detecting system, it is real
The accurate detection and positioning of existing partial discharge of switchgear.
Problem of the present invention is that solved with following technical proposals：
A kind of partial discharge of switchgear detecting system, composition include tablet personal computer, data collecting card, TEV sensors, super
High frequency sensors and four ultrasonic sensors, the TEV sensors, uhf sensor and four ultrasonic sensor difference
The different parts on switch cubicle surface are installed on, the different inputs of their signal output termination data collecting card, the data
The signal output termination tablet personal computer of capture card, the tablet personal computer are connected by wireless network with host computer.
Above-mentioned partial discharge of switchgear detecting system, also include TEV signal demodulator amplifiers in composition, TEV sensors are defeated
The ultra-high frequency signal gone out is sent into data collecting card through TEV signal demodulators amplifier.
Above-mentioned partial discharge of switchgear detecting system, also include ultra-high frequency signal detector amplefier in composition, superelevation is kept pouring in
The ultra-high frequency signal of sensor output is sent into data collecting card through ultra-high frequency signal detector amplefier.
Above-mentioned partial discharge of switchgear detecting system, also include filter amplifier in composition, four ultrasonic sensors are defeated
The different inputs of data collecting card are sent into after the filtered amplifier processing of ultrasonic signal gone out.
Above-mentioned partial discharge of switchgear detecting system, four ultrasonic sensors are separately mounted to four angles of switch cubicle
Place.
The present invention carries out combined monitoring using three kinds of sensors having complementary advantages to partial discharge of switchgear, can not only have
Effect avoids disturbing caused by live complex environment, improves Detection accuracy, and can realize to the accurate fixed of Partial Discharge Sources
Position and discharge mode accurately identify, and substantially increase the detection level of partial discharge of switchgear.It is, in general, that transported in switch cubicle
There is substantial amounts of Electromagnetic Interference signal harmony interference wave signal at capable scene, therefore uses the monitoring side based on both physical quantitys
Method can be excluded because erroneous judgement caused by background noise, in terms of positioning, because traditional " several " method is for shelf depreciation
The determination that the moment occurs does not have " acoustic-electric " accurately, and the processing procedure of these signals is complex, is difficult to transport in detection and localization
With.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the scheme of installation of four ultrasonic sensors.
In figure respectively marked as：PD, shelf depreciation point, the ultrasonic sensor of S1~S4, the first ultrasonic sensor~the 4th,
U1, data collecting card, U2, tablet personal computer, U3, host computer, LF, filter amplifier, JF1, TEV signal demodulator amplifier, JF2,
Ultra-high frequency signal detector amplefier, TEV, TEV sensor, GP, uhf sensor.
Embodiment
Referring to Fig. 1, the present invention includes four ultrasonic sensors（That is the ultrasonic wave of the first ultrasonic sensor S1~the 4th passes
Sensor S4）, uhf sensor GP, TEV sensor, filter amplifier LF, TEV signal demodulator amplifier JF1, ultra-high frequency signal
Detector amplefier JF2, data collecting card U1, tablet personal computer U2 and power module U3.
Four ultrasonic sensors are arranged in 4 corners of switch cubicle and are connected with filter amplifier LF（Referring to
Fig. 2）；Uhf sensor GP is arranged in switch cubicle front window and is connected with ultra-high frequency signal detector amplefier JF2；TEV is sensed
Device is arranged on switch cubicle surface and is connected with TEV signal demodulator amplifiers JF1.Filter amplifier LF is used to receive four ultrasounds
The signal of wave sensor, interference signal therein is filtered off, then data collecting card is sent into after the signal that filtering process is crossed is amplified
U1；TEV signal demodulator amplifier JF1 and ultra-high frequency signal detector amplefier JF2 are used to realize the inspection to TEV and ultra-high frequency signal
Ripple processing, because the frequency of TEV signals and ultra-high frequency signal is excessive, is unfavorable for data collecting card U1 processing, it is therefore desirable to two
Detector amplefier carries out being re-fed into data collecting card U1 after frequency reducing and amplification.
Data collecting card U1 is multichannel, high speed synchronous sample card, and any of which passage can be selected to believe as ultrasonic wave
Number receiving channel, TEV signals receiving channel or hyperfrequency receiving channel.
The data that data collecting card U1 is collected are connected by USB connecting lines with tablet personal computer U2, tablet personal computer U2 docking
The signal received is handled.The maximum t in sound wave computed in advance propagation time in switch cubicle before the testmaxWith minimum
Value tmin, using the output signal of uhf sensor GP or TEV sensor as trigger signal, when calculating the propagation of ultrasonic signal
Between t, if tmin<t<tmaxThen it is determined as that inside switch cabinet discharges, carries out shelf depreciation positioning afterwards, and combines TEV sensors and survey
The discharge capacity measured, pattern-recognition is carried out to electric discharge type.The tmaxIt can be determined according to the size and the velocity of sound of switch cubicle.
The power module of the system uses rechargeable battery, and power module supplies to tablet personal computer U2 and data collecting card U1
Electricity, it is ensured that the system has longer usage time.
Tablet personal computer U2 has alarm and wireless data transmission function, can send different loudness according to the order of severity of electric discharge
Alarm bell sound, while utilize wireless module, measurement data is sent into host computer U3 carries out stored record and printing.
The course of work of the present invention is as follows：
Data collecting card U1 is acquired to the ultrasonic signal after the ultra-high frequency signal and filter and amplification after detection amplification,
It is sent to tablet personal computer U2.Because the spread speed of electromagnetic wave in space is similar to the light velocity, it is believed that receive ultra-high frequency signal
At the time of be shelf depreciation occur at the time of.Tablet personal computer U2 selects ultra-high frequency signal as timing reference signal, according to the
The time difference of ultra-high frequency signal is received with uhf sensor GP and wait at the time of four ultrasonic sensors receive signal
It is worth velocity of sound v, calculates four ultrasonic sensors to the distance of Partial Discharge Sources, and then solve the coordinate of Partial Discharge Sources.
Uhf sensor GP position should be placed at the gap that cabinet door is connected with cabinet, according to experiment, due to switch cubicle
It is a metal cabinet, has shielding action to electromagnetic wave, therefore uhf sensor is placed in the gap that cabinet door is connected with cabinet
Place, both without prejudice to the receiving of signal, can avoid the interference of other signals again.
The signal that TEV sensors collect incoming data capture card U1 after detection is amplified；Data collecting card U1 will be gathered
To TEV signals be sent into tablet personal computer U2；Tablet personal computer U2 extracts the characteristic quantity of signal, is identified further according to the characteristic quantity of signal
Go out the type of this shelf depreciation.
Due to each signal how much all can some background noises, these three types of the invention sensor collection be
Different types of signal, and it is each advantageous, it is possible to learn from other's strong points to offset one's weaknesses.Specifically, TEV sensors and uhf sensor be all
There is higher sensitivity, even if there is faint electric discharge also to detect, but the noise of scene some electromagnetic interferences sometimes simultaneously,
Only it is by TEV sensors and uhf sensor it cannot be determined whether shelf depreciation occurs, therefore ultrasonic sensor can be used
To carry out secondary-confirmation.In addition, TEV signals and ultra-high frequency signal are the signals of different frequency, the monitoring frequency of TEV signals is relative
Relatively low, the monitoring frequency of ultra-high frequency signal is of a relatively high, the electric discharge for single, not necessarily can all produce both electric discharge letters
Number, therefore can more accurately detect electric discharge using both approaches.Simultaneously ultrasonic wave in terms of positioning compared with TEV and superelevation
Frequency has certain advantage, but the velocity of wave of electromagnetic wave is significantly lower than because of the velocity of sound, therefore TEV or ultra-high frequency signal can be utilized to monitor
Initial time of first signal arrived as electric discharge, carries out shelf depreciation point location.
In a word, the present invention can be achieved detection, positioning and identification to partial discharge of switchgear, experiment show the present invention for
Shelf depreciation has higher discrimination, and accurate positioning, effectively reduces the occurrence of failing to judge, judging by accident, improves electrically
The operating efficiency of plant maintenance.
Claims (2)
1. a kind of partial discharge of switchgear detecting system, it is characterized in that, including tablet personal computer (U2), data collecting card (U1), TEV
Sensor, uhf sensor (GP) and four ultrasonic sensors, the TEV sensors, uhf sensor (GP) and four
Individual ultrasonic sensor is respectively arranged in the different parts on switch cubicle surface, their signal output termination data collecting card (U1)
Different inputs, the signal output termination tablet personal computer (U2) of the data collecting card (U1), the tablet personal computer (U2) is logical
Wireless network is crossed to be connected with host computer (U3)；
Four ultrasonic sensors are separately mounted at four angles of switch cubicle；
Uhf sensor is placed at the gap that cabinet door is connected with cabinet；
TEV signals and ultra-high frequency signal are the signals of different frequency, and the monitoring frequency of TEV signals is relatively low, ultra-high frequency signal
Monitoring frequency it is of a relatively high；
Ultra-high frequency signal detector amplefier (JF2) is set, and the ultra-high frequency signal of uhf sensor (GP) output is believed through hyperfrequency
Number detector amplefier (JF2) is sent into data collecting card (U1)；
TEV signal demodulators amplifier (JF1) is set, and the ultra-high frequency signal of TEV sensors output is through TEV signal demodulator amplifiers
(JF1) it is sent into data collecting card (U1)；
The maximum tmax and minimum value tmin in sound wave propagation time in switch cubicle are calculated, with uhf sensor GP or TEV
The output signal of sensor calculates the propagation time t of ultrasonic signal, if tmin as trigger signal<t<Tmax is then determined as out
Cabinet internal discharge is closed, shelf depreciation positioning, and the discharge capacity obtained with reference to TEV sensor measurements are carried out afterwards, to electric discharge type
Carry out pattern-recognition.
2. partial discharge of switchgear detecting system according to claim 1, it is characterized in that, filter and amplification is also included in composition
Device (LF), data collecting card is sent into after the filtered amplifier of ultrasonic signal (LF) processing of four ultrasonic sensor output
(U1) different inputs.
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| CN201510215098.7A CN104808123B (en) | 2015-04-30 | 2015-04-30 | A kind of partial discharge of switchgear detecting system |
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| CN201510215098.7A CN104808123B (en) | 2015-04-30 | 2015-04-30 | A kind of partial discharge of switchgear detecting system |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105203929B (en) * | 2015-09-08 | 2018-02-13 | 武汉大学 | A kind of fixed switching cabinet online detector for partial discharge and method |
| CN105372566B (en) * | 2015-12-04 | 2019-01-08 | 重庆臻远电气有限公司 | wireless local discharge signal acquisition device |
| CN108333485A (en) * | 2018-01-25 | 2018-07-27 | 武汉国能测控有限公司 | A kind of partial discharge of switchgear monitoring system |
| CN108427067A (en) * | 2018-06-12 | 2018-08-21 | 国网江苏省电力有限公司宜兴市供电分公司 | A kind of partial discharge of switchgear fault detection method, apparatus and system |
| CN111190083A (en) * | 2020-01-13 | 2020-05-22 | 沈阳航空航天大学 | Switch cabinet partial discharge online monitoring system based on FPGA module |
| CN111505455B (en) * | 2020-04-26 | 2023-03-14 | 国家电网有限公司 | High-voltage switch cabinet partial discharge positioning detection system and detection method |
| CN112345892B (en) * | 2020-09-21 | 2024-05-31 | 国网河南省电力公司安阳供电公司 | Auxiliary detection device for partial discharge of high-voltage switch cabinet |
| CN112326035A (en) * | 2020-09-22 | 2021-02-05 | 云南电网有限责任公司昆明供电局 | Method for storing working state data of internal equipment of high-voltage switch cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102435922A (en) * | 2011-10-26 | 2012-05-02 | 上海交通大学 | Acoustic-electric combined detection system and positioning method for GIS (Gas Insulated Switchgear) local discharge |
| CN102749557A (en) * | 2012-06-07 | 2012-10-24 | 国网电力科学研究院武汉南瑞有限责任公司 | Partial discharging detecting device of switch cabinet |
| CN202720309U (en) * | 2012-08-01 | 2013-02-06 | 北京博电新力电气股份有限公司 | Detection and positioning system for partial discharging |
| CN103176110B (en) * | 2013-02-01 | 2015-11-18 | 广东电网有限责任公司电力科学研究院 | A kind of partial discharge detection test platform of medium-voltage switch cabinet |
| CN103278751B (en) * | 2013-04-27 | 2014-11-19 | 国家电网公司 | Partial discharge comprehensive itinerant detector for high voltage electric power equipment |
| CN103558526A (en) * | 2013-11-12 | 2014-02-05 | 国网上海市电力公司 | Method for detection of partial discharge of switch cabinet |
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Inventor after: Li Zhenjie Inventor after: Peng Hongxia Inventor after: Zhang Weiguo Inventor after: Wang Zhijie Inventor after: Yan Dong Inventor after: Wang Shenghui Inventor before: Zhou Yu Inventor before: Wang Shenghui Inventor before: Zhan Zhenyu Inventor before: Peng Hongxia Inventor before: Zhang Weiguo Inventor before: Li Jipan Inventor before: Sheng Ruiming Inventor before: Liu Xiangxing Inventor before: Yan Dong Inventor before: Zhao Junjie Inventor before: Lv Fangcheng |
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