CN103713243A - 10-V switch cabinet internal discharge detection device based on electromagnetic wave antenna receiving array - Google Patents
10-V switch cabinet internal discharge detection device based on electromagnetic wave antenna receiving array Download PDFInfo
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- CN103713243A CN103713243A CN201310743134.8A CN201310743134A CN103713243A CN 103713243 A CN103713243 A CN 103713243A CN 201310743134 A CN201310743134 A CN 201310743134A CN 103713243 A CN103713243 A CN 103713243A
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Abstract
The invention discloses a detection device, and particularly relates to a 10-V switch cabinet internal discharge detection device based on an electromagnetic wave antenna receiving array. The 10-V switch cabinet internal discharge detection device based on the electromagnetic wave antenna receiving array comprises an antenna array receiver connected with a variable gain amplifier, wherein the variable gain amplifier is connected with a band-pass filter through a current signal and voltage signal conversion circuit, the band-pass filter is connected with an A/D convertor, the A/D convertor is connected with a D/A convertor through a data communication module, the D/A convertor is connected with a microprocessor, and the microprocessor is connected with a fault information display screen and a data storage module. The 10-V switch cabinet internal discharge detection device based on the electromagnetic wave antenna receiving array is simple in structure, microwave signals, emitted by partial discharge, around a 10-V switch cabinet can be monitored all the day in an on-line mode, then internal discharge faults of the 10-V switch cabinet can be monitored on line, the practicability is high, mass measurement data can be stored due to the storage module, and management on in-time mass communication between the detection device and a backstage service system is guaranteed through the communication module.
Description
Technical field
The present invention discloses a kind of pick-up unit, and particularly a kind of 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array, particularly comprises device and measuring method that localization of fault and fault type judge.
Background technology
10V switch cubicle range of application is huge, and running environment is different, due to long-term switch on-off process, understands the residing stage of its ageing process significant to safe operation of power system.For the detection of partial discharge of switchgear, all based on Real-Time Monitoring, discharge and whether exist at present.The index that neither one can quantize to monitor can reflect the ageing process of switch cubicle accurately.Electrical device distributes and concentrates in 10V switch cubicle, and the problem causing due to shelf depreciation is different, need to detect concrete fault type, and then understand failure cause.When the detection failure of switch cabinet of converting station shelf depreciation, be the amplitude by discharge signal substantially, frequencies etc. obtain discharge fault type by rational supposition.This method is practical, but accuracy is bad to novel fault.Needs are a kind of more accurately, from the fault detection method of mechanism.
Partial discharges fault position definite splits that to close the partial discharges fault analysis of causes of cabinet significant in 10V switch cubicle, and in existing research, for the research of partial discharge position, is the large weakness of one in existing research, there is not yet so far reasonable report.10V partial discharge of switchgear data are conventionally only for the detection to when time fault, and partial discharge of switchgear is a long-term process to finally causing switch cubicle fault even to be exploded.To the detection of shelf depreciation, it should be also comprehensive, a holocyclic evolution.Will be clear that and understand the process that the shelf depreciation of switch cubicle causes fault even to be exploded, be necessary to collect the signal of good various shelf depreciations, the information such as location, set up the database that is used for the scientific forecasting switch cubicle life-span.
Summary of the invention
According to above deficiency of the prior art, the problem to be solved in the present invention is: provide a kind of and can detect online, the practical 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array.
The technical solution adopted for the present invention to solve the technical problems is:
The described 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array, comprise aerial array receiver, aerial array receiver connects variable gain amplifier, variable gain amplifier is by current signal converting voltage signal circuit connecting band bandpass filter, bandpass filter connects A/D converter, A/D converter connects D/A converter by data communication module, and D/A converter connects microprocessor, and microprocessor connects failure message display screen and data memory module;
Aerial array receiver is arranged on to the cabinet outside of switch cubicle, for receiving the microwave signal of being launched by shelf depreciation, the microwave signal of reception is transferred to variable gain amplifier, the microwave signal microwave signal that gain is amplified process gain by current signal converting voltage signal circuit after amplifying through variable gain amplifier converts voltage signal to and sends bandpass filter to, from the voltage signal of bandpass filter process, by A/D converter, signal is converted to digital signal, digital signal sends D/A converter to by data communication module, by D/A converter, digital signal is reduced, signal after reduction is transferred to signal processing system, by the inside switch cabinet electric discharge intelligent diagnostics in microprocessor and the processing of fault locating analysis system, result is presented to failure message display screen, and signal message is stored in data memory module, and set up inside switch cabinet discharge signal data memory module by the division of signal of different electric discharge types.
Electric discharge intelligent diagnostics and fault locating analysis program are built in microprocessor, when receiving the discharge signal sending over from leading portion, will automatically to it, carry out frequency analysis, amplitude analysis etc., tentatively judge that partial discharges fault type and electric discharge are strong and weak.And by the signal comparison to diverse location aerial array, multithreading overall treatment is from the electric discharge electromagnetic wave signal of different sensors.Adopt finder to judge discharge position.
Preferred further, data communication module comprises RS232 module and RS485 module.
Preferred further, data memory module adopts hard-disc storage.Memory space is large.
Preferred further, A/D converter adopts independent A/D conversion chip.A/D converter adopts 16 sigma-delta ADC of microprocessor internal.Under single, the switching rate of A/D converter, up to 50ksps, is supported single channel signal input and differential signal input pattern.The data that A/D converter gathers can autostore in microprocessor internal impact damper, reduce system operation time.
Preferred further, D/A converter adopts independent D/A conversion chip.D/A converter adopts the chip DAC8562SDGSR of company of Texas Instrument (TI).DAC8562 has that 16 of 2.5V, 4ppm/ ℃ benchmark, two-way, low-power consumption, ultralow short-time pulse waveform disturb, the DAC of buffer voltagc output.DAC8562 chip and microcontroller 1 are by standard SPI interface communication.DAC8562 has the separate analog voltage output port of two-way (VoutA and VoutB).
Preferred further, data communication module is connected with aerial array receiver.Ensured magnanimity telecommunication management real-time between measurement mechanism and background service system.
The beneficial effect that the present invention has is:
The described 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array can be realized 24 hours microwave signals of being launched by shelf depreciation around on-line monitoring 10V switch cubicle, and then realizes the on-line monitoring to 10V inside switch cabinet discharge fault.The on-line monitoring of internal discharge fault adopts frequency electromagnetic waves survey sensor, can realize the electromagnetic intensity of measurement point is carried out to Measurement accuracy.Memory module in device has ensured the mass memory of measurement data.Communication module in device has ensured magnanimity telecommunication management real-time between measurement mechanism and background service system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is variable-gain amplification circuit schematic diagram of the present invention;
Fig. 3 is current signal converting voltage signal circuit schematic diagram of the present invention;
Fig. 4 is bandwidth-limited circuit schematic diagram of the present invention;
Fig. 5 is D/A converter circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described further:
As shown in Figure 1,10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array of the present invention, comprise aerial array receiver, aerial array receiver connects variable gain amplifier, variable gain amplifier is by current signal converting voltage signal circuit connecting band bandpass filter, bandpass filter connects A/D converter, A/D converter connects D/A converter by data communication module, D/A converter connects microprocessor, and microprocessor connects failure message display screen and data memory module;
Aerial array receiver is arranged on to the cabinet outside of switch cubicle, for receiving the microwave signal of being launched by shelf depreciation, the microwave signal of reception is transferred to variable gain amplifier, the microwave signal microwave signal that gain is amplified process gain by current signal converting voltage signal circuit after amplifying through variable gain amplifier converts voltage signal to and sends bandpass filter to, from the voltage signal of bandpass filter process, by A/D converter, signal is converted to digital signal, digital signal sends D/A converter to by data communication module, by D/A converter, digital signal is reduced, signal after reduction is transferred to signal processing system, by the inside switch cabinet electric discharge intelligent diagnostics in microprocessor and the processing of fault locating analysis system, result is presented to failure message display screen, and signal message is stored in data memory module, and set up inside switch cabinet discharge signal data memory module by the division of signal of different electric discharge types.
Wherein, data communication module comprises RS232 module and RS485 module, and data memory module adopts hard-disc storage.A/D converter adopts independent A/D conversion chip, and D/A converter adopts independent D/A conversion chip.Data communication module is connected with aerial array receiver.
Aerial array of the present invention is comprised of eight high precision electro magnetic wave survey sensors, and its survey frequency should be accomplished entire spectrum measurement in the requirement that meets measurement amplitude.The signal that aerial array gathers is transmitted through the fiber to signal gain amplifier and carries out signal amplification.
Signal, after gathering, transfers to signal gain amplifier leading portion, and Fig. 2 is signal gain amplifier schematic diagram.After gain amplifier, signal will become and be easy to be unlikely to compared with long Distance Transmission in transmission line undue decay and cause signal excessive distortion.
Current signal voltage of transformation signal circuit converts the current signal through gain to voltage signal, sends bandpass filtering to.
Voltage signal is eliminated undesired signal through bandpass filtering, because frequency spectrum and the amplitude of dissimilar shelf depreciation are all had any different, so, need to carry out frequency-selecting to voltage signal.Choosing the characteristic frequency that can reflect different discharge faults classifies and processes and transmission.
Through the signal after bandpass filtering, by A/D converter, can adopt independent A/D conversion chip.D/A converter can adopt independent D/A conversion chip.
Microprocessor is by communication module and other external device communication.In microprocessor, be built-in with 10V inside switch cabinet partial discharge diagnosis system.Can judge the type of discharge fault, the degree of discharge fault and concrete internal discharge position.Can effectively locate partial discharges fault point.
Referring to accompanying drawing 2, provided the particular circuit configurations of the indefiniteness of a variable gain amplifier employing chip AD8330ACP.AD8330 is a DC to the 150MHz wide bandwidth variable gain amplifier of Ya De promise semiconductor (ADI) company, is applicable to requiring the application of fully differential signal path, low noise, explication gain and appropriate low distortion.The basic gain function of this chip is linear dB, is subject to the alive control of executing on pin VDBS.Gain margin is 0dB to 50dB, and corresponding control voltage is 0V to 1.5V, and slope is 30mV/dB.
The particular circuit configurations figure that represents an indefiniteness of current signal voltage of transformation signal circuit referring to accompanying drawing 3, current signal converts voltage signal to through current signal voltage of transformation signal circuit, and current signal voltage of transformation signal circuit is comprised of operational amplifier A DA4841-2.ADA4841-2 is a unity gain stable type, low noise and low distortion, the rail-to-rail output amplifier of Ya De promise semiconductor (ADI) company, and maximum static current is 1.5mA.The first half of current signal voltage of transformation signal circuit is transformed into voltage signal by the current signal of input, and the voltage signal of conversion is carried out to homophase amplification to the latter half of circuit or voltage follow is processed, then input tape pass filter.
The particular circuit configurations figure that represents an indefiniteness of bandpass filtering referring to accompanying drawing 4, carries out bandpass filtering treatment to the voltage signal of current signal voltage of transformation signal circuit output, and bandwidth-limited circuit is comprised of operational amplifier A DA4841-2.Bandpass filtering is comprised of a Hi-pass filter and a low-pass filter.Utilize two operational amplifier A DA4841-2 to build respectively Hi-pass filter and low-pass filter, then the two series connection is obtained to bandpass filter.
Referring to accompanying drawing 5, provided the particular circuit configurations of the indefiniteness of D/A converter.D/A converter adopts the chip DAC8562SDGSR of company of Texas Instrument (TI).DAC8562 has that 16 of 2.5V, 4ppm/ ℃ benchmark, two-way, low-power consumption, ultralow short-time pulse waveform disturb, the DAC of buffer voltagc output.DAC8562 chip and microcontroller 1 are by standard SPI interface communication.DAC8562 has the separate analog voltage output port of two-way (VoutA and VoutB).
Claims (6)
1. the 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array, it is characterized in that: comprise aerial array receiver, aerial array receiver connects variable gain amplifier, variable gain amplifier is by current signal converting voltage signal circuit connecting band bandpass filter, bandpass filter connects A/D converter, A/D converter connects D/A converter by data communication module, D/A converter connects microprocessor, and microprocessor connects failure message display screen and data memory module;
Aerial array receiver is arranged on to the cabinet outside of switch cubicle, for receiving the microwave signal of being launched by shelf depreciation, the microwave signal of reception is transferred to variable gain amplifier, the microwave signal microwave signal that gain is amplified process gain by current signal converting voltage signal circuit after amplifying through variable gain amplifier converts voltage signal to and sends bandpass filter to, from the voltage signal of bandpass filter process, by A/D converter, signal is converted to digital signal, digital signal sends D/A converter to by data communication module, by D/A converter, digital signal is reduced, signal after reduction is transferred to signal processing system, by the inside switch cabinet electric discharge intelligent diagnostics in microprocessor and the processing of fault locating analysis system, result is presented to failure message display screen, and signal message is stored in data memory module, and set up inside switch cabinet discharge signal data memory module by the division of signal of different electric discharge types.
2. the 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array according to claim 1, is characterized in that: described data communication module comprises RS232 module and RS485 module.
3. the 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array according to claim 1, is characterized in that: described data memory module adopts hard-disc storage.
4. the 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array according to claim 1, is characterized in that: described A/D converter adopts independent A/D conversion chip.
5. the 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array according to claim 1, is characterized in that: described D/A converter adopts independent D/A conversion chip.
6. the 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array according to claim 1, is characterized in that: described data communication module is connected with aerial array receiver.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104267320A (en) * | 2014-10-08 | 2015-01-07 | 广西电网有限责任公司玉林供电局 | High-voltage switch cabinet partial discharge monitoring system based on ultrahigh-frequency electromagnetic wave detection |
| CN109406964A (en) * | 2018-11-16 | 2019-03-01 | 国网江苏省电力有限公司盐城供电分公司 | A kind of cable system partial discharge positioning method of more cut cables |
| CN111880052A (en) * | 2020-06-30 | 2020-11-03 | 国网山东省电力公司淄博供电公司 | Hand-held type partial discharge detection device based on bluetooth interconnection terminal cluster |
| CN112017907A (en) * | 2020-08-13 | 2020-12-01 | 黄山学院 | Vacuum degree degradation non-contact detection method of vacuum circuit breaker and early warning device thereof |
| CN113030663A (en) * | 2021-03-09 | 2021-06-25 | 安徽中科超屹科技有限公司 | Electric power equipment with collecting and analyzing functions |
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| CN111880052A (en) * | 2020-06-30 | 2020-11-03 | 国网山东省电力公司淄博供电公司 | Hand-held type partial discharge detection device based on bluetooth interconnection terminal cluster |
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| CN113030663A (en) * | 2021-03-09 | 2021-06-25 | 安徽中科超屹科技有限公司 | Electric power equipment with collecting and analyzing functions |
| CN113030663B (en) * | 2021-03-09 | 2024-05-03 | 安徽中科超屹科技有限公司 | Power equipment with collecting and analyzing functions |
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Inventor after: Liu Xinghua Inventor after: Yun Yuxin Inventor after: Zhu Mengzhao Inventor after: Ma Yan Inventor after: Yue Zengwei Inventor after: Cui Chuan Inventor after: Xu Tianxi Inventor after: Zhou Cheng Inventor after: Sun Xuefeng Inventor after: Huang Rui Inventor after: Wang Tao Inventor after: Lv Xuebin Inventor after: Lv Juntao Inventor after: Du Xiuming Inventor after: Zhang Yong Inventor after: Yu Pi Inventor before: Liu Xinghua Inventor before: Xian Richang Inventor before: Sun Xuefeng Inventor before: Chen Suhong Inventor before: Wang Tao Inventor before: Yang Fan |
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