CN201885852U - Online monitoring device for vacuum degree of vacuum circuit breaker on basis of pulse discharging detection - Google Patents

Online monitoring device for vacuum degree of vacuum circuit breaker on basis of pulse discharging detection Download PDF

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Publication number
CN201885852U
CN201885852U CN2010205416491U CN201020541649U CN201885852U CN 201885852 U CN201885852 U CN 201885852U CN 2010205416491 U CN2010205416491 U CN 2010205416491U CN 201020541649 U CN201020541649 U CN 201020541649U CN 201885852 U CN201885852 U CN 201885852U
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China
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signal
electric field
vacuum
signal processing
vacuum circuit
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Expired - Fee Related
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CN2010205416491U
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Chinese (zh)
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李卫国
邓鑫
张阔
闫文斌
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BEIJING HUADIAN FENGNIAO TECHNOLOGIES Co Ltd
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BEIJING HUADIAN FENGNIAO TECHNOLOGIES Co Ltd
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Abstract

The utility model relates to an online monitoring device for the vacuum degree of a vacuum circuit breaker on the basis of pulse discharging detection, consisting of four parts, namely, an electric field measuring probe, an intelligent signal processing unit, a microprocessor network interface unit and an upper computer, wherein the electric field measuring probe transfers detection signals to the intelligent signal processing unit; and processed data is transmitted to the upper computer by the microprocessor network interface unit. In the online monitoring device, the electric field measuring probe can detect the change of the electric field at the periphery and local discharging signals in an arc extinguish chamber simultaneously, and the intensity of direct-current signals and the intensity of high-frequency signals after data processing are used as double criterions for descending of the vacuum degree, therefore, the device has higher sensitivity.

Description

Vacuity of Vacuum Circuit Breakers on-Line Monitor Device based on the pulsed discharge detection
Affiliated technical field
The utility model relates to a kind of vacuum circuit breaker on-line monitoring equipment, particularly a kind of on-Line Monitor Device that detects based on pulsed discharge.
Background technology
Along with vacuum circuit breaker in the more and more general application in mesolow field, because cut-offfing with the pass accident of closing that arc-chutes gas leakage, vacuum degree deficiency cause happens occasionally, the core of vacuum circuit breaker is a vacuum interrupter, and only under certain vacuum tightness, the reliability of vacuum switch just can be guaranteed.The related standards regulation of vacuum interrupter: " the indoor internal gas pressure of vacuum extinction in order to the assembling vacuum circuit breaker should be lower than 1.33 * 10 -3Pa ", this is meant the parameter surveyed under the static condition.The internal gas pressure of operating vacuum interrupter is actual to be a dynamic parameter, and the dynamic pressure during breaking current may reach the order of magnitude one or two far above this pressure values.When arc-chutes during near the emergent pressure state, the disjunction failure just may appear in the fault that is short-circuited.Therefore, the field personnel not only wishes can measure its internal gas pressure exactly before arc-chutes dispatch from the factory, calculate vacuum life, but also wish in use to realize that the scene of internal gas pressure do not dismantle test, in time detect the arc-chutes of those low vacuums.
The indirect method that is used for the online detection of vacuum tightness mainly contains 1. tonometry, promptly detects corrugated tube distortion so that detected pressures, thereby converts vacuum tightness, can only detect the arc-chutes of serious gas leakage.Owing to need to consider electrical isolation problem, circuit structure complexity; 2. miniature cold cathode meter method installs miniature cold cathode additional on vacuum bubbles, complex structure, cost are very high, and advantage is to measure vacuum tightness more accurately; 3. the discharge current detection method detects the fracture discharge current when vacuum switch is in gate-dividing state; Advantage is that circuit is simple, and shortcoming is to detect when fracture is in sub-gate position and puts, and the sensitivity of detection is not high yet, therefore limits its application; 4. the potential change detection method detects the variation that vacuum tightness changes the rear perimeter edge electric field, and signal is drawn to be needed to adopt the contour insulating material of optical fiber, provides working power to become difficult point to probe; 5. coupling capacitance method, the detection in the time of can only dropping to that to a certain degree discharge takes place in the back to vacuum tightness.
Potential change detection method and coupling capacitance method are comparatively advanced, needn't carry out when fracture is opened, and the sensitivity that detects are the highest in several detection methods.But because the bubble Ke Ersi element that common potential method adopts is one group of optical module, price is difficult for reaching popularity for the moment and under the strong vibration environment interference problem is arranged, electric capacity is strengthened causing bigger local field strength thereby sensitivity and electric field stability also need add high pressure, and influences the safe operation of arc-chutes.
Summary of the invention
In order to remedy the deficiencies in the prior art, the vacuum switch on-Line Monitor Device combines the advantage of potential change detection method and coupling capacitance method, adopts inversion type electric field detection probe, detects electric field change and local discharge signal simultaneously.Because probe keeps enough electrical distances with arc-chutes, has guaranteed the safe operation of vacuum circuit breaker.And reduce cost effectively, strengthened practicality.
The technical scheme that its technical matters that solves the utility model adopts is: it is made up of electric field measurement probe, intelligent signal processing unit, microprocessor network interface unit, host computer four parts; Wherein, detect in the vacuum circuit breaker because the faint pulsed discharge signal that vacuum tightness descends and produces by the electric field measurement probe that is installed under the vacuum circuit breaker, send to the intelligent signal processing unit by the signal conveys passage with corresponding filtering, amplification and the switching device data that shelf depreciation is relevant, behind the peripheral electric field signal and local discharge signal that collects, carry out the high speed signal conversion, and obtain three-phase first-harmonic and high-frequency signal through digital signal processing.Thereby the relative variation that the three-phase first-harmonic obtains peripheral electric field through the overbalance computing corresponds to the variation of vacuum tightness, and the signal of the corresponding shelf depreciation of high-frequency signal also is reflected to the variation of vacuum tightness.Itself does not just have noise jamming fundamental signal after the processing, moves through simple phase equilibrium and can eliminate interphase interference, and local discharge signal then owing to convert energy signal to, therefore has very high interference free performance.Intelligent processing unit is through giving the arc-chutes alerting signal that is out of order behind the signal determining, the microprocessor network interface unit communicates the three-phase first-harmonic and the high-frequency signal of conversion by 485 commentaries on classics LAN (Local Area Network) and upper main frame simultaneously.
The beneficial effects of the utility model are: the centre frequency of the shelf depreciation in the arc-chutes is in tens KHz, and the inversion type detection probe can reach this frequency band easily, thereby can measure shelf depreciation, the advantage of comprehensive two kinds of main stream approach simultaneously.Evidence simultaneously, vacuum tightness descend the energy of the shelf depreciation that the back produces much larger than the background high frequency noise, thereby can obtain reliable criterion, also have very high interference free performance.
Description of drawings
Fig. 1 is the utility model example structure synoptic diagram
Among the figure: electric field measurement probe 1, intelligent signal processing unit 2, microprocessor network interface unit 3, host computer 4
Fig. 2 is three-phase electricity field measurement probe
Among the figure: signals collecting 5, high-voltage capacitor 6, circular circuit board 7, dividing potential drop electric capacity 8, ground wire 9, operational amplifier 10, photoisolator 11, externally fed and output signal unit 12
Fig. 3 is the intelligent signal processing unit
Among the figure: 220V Power Entry Module 13, Switching Power Supply 14, ± output of 12V power supply and signal input unit 15, AVR single-chip data acquisition unit 16, actuating relay 17, AVR communication 232 changes 485 modules 18, signal of communication output unit 19
Embodiment
In Fig. 1, each vacuum circuit breaker has three vacuum interrupters, bear A, B, C voltage in three phases respectively, certain distance internal fixation electric field measurement probe 1 under arc-chutes, what export is the radome electric potential signal of vacuum interrupter, handles through intelligent signal processing unit 2 amplifications, filtering, A/D conversion, data acquisition system (DAS); Signal after the processing is radome DC component and high fdrequency component, is sent to host computer 4 by microprocessor network interface unit 3.Vacuum state in the arc-chutes is demarcated, shows, assessed to host computer 4 according to DC component and high fdrequency component to vacuum tightness.
In Fig. 2, electric field measurement probe 1 is made up of semicircular aluminium matter signals collecting 5 and high-voltage capacitor 6 and circular circuit board 7, and circular circuit board 7 is made up of dividing potential drop electric capacity 8, ground wire 9, operational amplifier 10, photoisolator 11, externally fed and output signal unit 12.For avoiding point discharge, collection head is made into semicircle, the electric charge of radome induction can change along with the variation of vacuum tightness, simultaneously on the signals collecting head, also can induce certain electric charge, signals collecting 5 and high-voltage capacitor 6 contact, said process causes the redistribution of electric charge on high-voltage capacitor 6 and the dividing potential drop electric capacity 8, can follow the tracks of the change procedure of radome current potential by the variation of detection signal output terminal, detected signal enters photoelectrical coupler 11 through operational amplifier 10, being electrically connected of disabling signal source and receiving side signal can have blocking-up electrical Interference like this and strengthen electrical isolation capabilities.Wherein externally fed and output signal unit 12 by intelligent signal processing unit 3 provide operational amplifier work ± the 12V power supply, and the output of signal.
In Fig. 3, the intelligent signal processing cellular construction is made up of supply module, signal analyse block, communication module three parts: wherein supply module by 220V Power Entry Module 13, Switching Power Supply 14, ± 12V power supply output 15 forms; Signal analyse block is made up of signal input terminal 15, AVR single-chip data acquisition unit 16; Communication module is made up of actuating relay 17, AVR communication 232 commentaries on classics 485 modules 18, signal of communication lead-out terminal 19.The power supply of circuit board is given by 220V Power Entry Module 13 and is formed small-power switching power-supply 14 by UC3843 and produce, by transformer generations ± 12V to electric field measurement probe 1, ± 5V powers to intelligent signal processing unit 2.Slave computer data acquisition system (DAS) 16 comprises numeral and simulation two parts, mainly is responsible for collection, analysis and the processing of three-phase probe output.Simulation part has three tunnel separate acquisition channels, gather respectively A, B, C three-phase through the signal behind the photoelectrical coupler, utilize programmable gain amplifier PGA that signal is carried out secondary and amplify, to improve the transmittability of signal.Numerical portion is by the Atmega16 Single-chip Controlling, adopts the A/D modular converter to gather simulating signal, and the data after will gathering by digital filter carry out filtering and separate with alternating current-direct current, obtains DC component and high fdrequency component, is being sent to host computer passing through the CAN bus.According to the judged result of program,, start actuating relay 17 if vacuum tightness descends.Utilize AVR communication 232 commentaries on classics 485 modules 18, signal of communication output unit 19 that signal is reached host computer 4 simultaneously, 4 pairs of data of host computer gather, analyze the vacuum tightness state and show on control panel, deposit simultaneously among the Flash, convenient inquiry later on.

Claims (3)

1. the Vacuity of Vacuum Circuit Breakers on-Line Monitor Device that detects based on pulsed discharge is characterized in that it is made up of electric field measurement probe, intelligent signal processing unit, microprocessor network interface unit, host computer four parts; Wherein, electric field measurement probe detection signal passes to the intelligent signal processing unit, and data after treatment are sent to host computer through the microprocessor network interface unit.
2. the Vacuity of Vacuum Circuit Breakers on-Line Monitor Device that detects based on pulsed discharge according to claim 1, it is characterized in that, described electric field measurement sonde configuration is: the aluminium matter signals collecting head of semicircle shape is connected with high-voltage capacitor one end, and its other end is connected with circular circuit board as signal output part; Circular circuit board is made up of dividing potential drop electric capacity, ground wire, operational amplifier, photoisolator, externally fed and output signal terminal.
3. the Vacuity of Vacuum Circuit Breakers on-Line Monitor Device that detects based on pulsed discharge according to claim 1, it is characterized in that described intelligent signal processing cellular construction is made up of supply module, signal analyse block, communication module three parts: wherein supply module by 220V Power Entry Module, Switching Power Supply, ± output of 12V power supply forms; Signal analyse block is made up of signal input terminal, AVR single-chip data acquisition unit; Communication module is made up of actuating relay, AVR communication 232 commentaries on classics 485 modules, signal of communication lead-out terminal.
CN2010205416491U 2010-09-26 2010-09-26 Online monitoring device for vacuum degree of vacuum circuit breaker on basis of pulse discharging detection Expired - Fee Related CN201885852U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102879735A (en) * 2012-10-11 2013-01-16 桂林电子科技大学 Online electric abrasion detecting method and system of vacuum circuit breaker
CN106855449A (en) * 2016-11-23 2017-06-16 国家电网公司 Based on magnetic charging theory high-pressure vacuum breaker arc-chutes vacuum degree measurement system
CN109298327A (en) * 2018-10-27 2019-02-01 乾瑞电气有限公司 A kind of vacuum circuit breaker digital monitoring method based on Internet of Things
CN111175615A (en) * 2019-12-20 2020-05-19 云南电网有限责任公司玉溪供电局 Vacuum degree associated partial discharge signal processing method
CN111584299A (en) * 2020-05-29 2020-08-25 国网河南省电力公司邓州市供电公司 Self-checking circuit and self-checking method for signal acquisition loop of vacuum degree monitoring device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102879735A (en) * 2012-10-11 2013-01-16 桂林电子科技大学 Online electric abrasion detecting method and system of vacuum circuit breaker
CN106855449A (en) * 2016-11-23 2017-06-16 国家电网公司 Based on magnetic charging theory high-pressure vacuum breaker arc-chutes vacuum degree measurement system
CN106855449B (en) * 2016-11-23 2023-11-24 国家电网公司 High-voltage vacuum circuit breaker arc extinguish chamber vacuum degree detection system based on magnetic control discharge theory
CN109298327A (en) * 2018-10-27 2019-02-01 乾瑞电气有限公司 A kind of vacuum circuit breaker digital monitoring method based on Internet of Things
CN111175615A (en) * 2019-12-20 2020-05-19 云南电网有限责任公司玉溪供电局 Vacuum degree associated partial discharge signal processing method
CN111584299A (en) * 2020-05-29 2020-08-25 国网河南省电力公司邓州市供电公司 Self-checking circuit and self-checking method for signal acquisition loop of vacuum degree monitoring device
CN111584299B (en) * 2020-05-29 2022-03-01 国网河南省电力公司邓州市供电公司 Self-checking circuit and self-checking method for signal acquisition loop of vacuum degree monitoring device

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Granted publication date: 20110629

Termination date: 20130926