CN203811775U - Breaker arcing starting time detection system - Google Patents

Breaker arcing starting time detection system Download PDF

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Publication number
CN203811775U
CN203811775U CN201420222845.0U CN201420222845U CN203811775U CN 203811775 U CN203811775 U CN 203811775U CN 201420222845 U CN201420222845 U CN 201420222845U CN 203811775 U CN203811775 U CN 203811775U
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China
Prior art keywords
electromagnetic wave
wave signal
isolating switch
phase
signal
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CN201420222845.0U
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Chinese (zh)
Inventor
黄兴泉
王伟
张欲晓
彭博
郭琳
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State Grid Corp of China SGCC
North China Electric Power University
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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State Grid Corp of China SGCC
North China Electric Power University
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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Application filed by State Grid Corp of China SGCC, North China Electric Power University, Electric Power Research Institute of State Grid Henan Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201420222845.0U priority Critical patent/CN203811775U/en
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Abstract

The utility model discloses a breaker arcing starting time detection system, comprising two electromagnetic wave signal acquisition devices. The distance between the first electromagnetic wave signal acquisition device and A phase of a breaker is the same with the distance between the second electromagnetic wave signal acquisition device and C phase of the breaker. The distance between the first electromagnetic wave signal acquisition device and B phase of the breaker is the same with the distance between the second electromagnetic wave signal acquisition device and B phase of the breaker. The signal output ends of the two electromagnetic wave signal acquisition devices are respectively connected with an oscilloscope. The system can determine the phase corresponding to the arcing starting time through reasonably arranging an antenna and comparing time difference electromagnetic waves reach the antenna. The system is simple and easy to use, and is high in measuring precision. The breaker arcing starting time detection system is not electrically connected with a system, and is safe and reliable, and meanwhile the detection system can distinguish which of the A phase, the B phase, and the C phase of the breaker firstly has electric arc.

Description

A kind of isolating switch arcing initial time detection system
Technical field
The utility model relates to a kind of measuring system that is applied to power transformation field, relates in particular to a kind of isolating switch arcing initial time detection system.
Background technology
Isolating switch is the hugest power equipment of quantity in electrical network, is bringing into play control and protection effect.Once isolating switch breaks down, will directly cause power grid accident, also may cause the expansion of existing accident, bring huge negative effect to national economy and social stability.
Switch off time is an important parameter of reflection isolating switch interrupting process, refer to isolating switch receive separating brake instruction moment play all each mutually in electric arc time intervals of finally extinguishing, comprise opening time and arc time two parts, wherein the arc time is the important parameter of sign isolating switch arc-rupturing capacity.Switch off time is divided into opening time and arc time, opening time be isolating switch receive separating brake instruction moment play all mutually in time intervals of the arcing contact time of releasing.Arc time for certain mutually in first starting the arc moment play each mutually in electric arc time interval of finally extinguishing, and the fall time of electric arc is normally at the zero crossing place of electric current, can obtain by measuring system electric current, so the key of arc time Measurement accuracy is to determine the arcing initial time of isolating switch.
Traditional arc time measures main passing through and measures dropout current, utilizes current sensor to obtain system power, owing to playing a post-arc current, no longer presents Sine distribution, thereby can analyze and determine the arc time current waveform.The subject matter that the method exists is: 1) need to gather current signal from CT, have directly electrical connection with system, have potential safety hazard; 2) response time of CT can exert an influence to measurement result.
Utility model content
The purpose of this utility model is to provide a kind of isolating switch arcing initial time detection system, isolating switch arcing initial time and corresponding separate, simple can be detected fast and accurately, and measuring accuracy is high, and with system without electrical connection, safe and reliable.
The utility model adopts following technical proposals:
A kind of isolating switch arcing initial time detection system, comprise two electromagnetic wave signal harvesters, the first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch C phase with the distance of isolating switch A phase, and the first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch B phase with the distance of isolating switch B phase; The signal output part of two electromagnetic wave signal harvesters connects respectively oscillograph.
Also comprise the 3rd electromagnetic wave signal harvester, the 3rd electromagnetic wave signal harvester is identical with the distance of the first electromagnetic wave signal harvester and isolating switch A phase with the distance of isolating switch B phase, and the signal output part of the 3rd electromagnetic wave signal harvester connects oscillograph.
Described electromagnetic wave signal harvester comprises antenna, signal condition amplification module and analog-to-digital conversion module, the signal output part of antenna connects the signal input part of signal condition amplification module, the signal output part of signal condition amplification module connects the signal input part of analog-to-digital conversion module, and the signal output part of analog-to-digital conversion module connects oscillograph.
Described signal condition amplification module comprises signal conditioner and power amplifier.
Described antenna adopts plane equiangular spiral radio-frequency antenna.
Described center of antenna detects frequency higher than 500MHz; Oscillograph acquisition channel is no less than the quantity of electromagnetic wave signal harvester, and oscillograph sampling rate is not less than 2GHz, and oscillograph is not less than 20mS sweep time under 2GHz sampling rate.
By two or three, the electromagnetic wave signal harvester in diverse location receives the electromagnetic wave signal sending when isolating switch cut-offs to the utility model, then use oscillograph to carry out Treatment Analysis to the signal of electromagnetic wave signal harvester output, finally utilize oscillograph to receive the time of signal and mistiming that different antennae receives signal is determined isolating switch arcing initial time and corresponding separate.Because electromagnetic wave signal harvester is in diverse location, distance apart from each phase of isolating switch is different, it is also different that the electromagnetic wave signal that arcing is sent arrives the time of each antenna, therefore by rational deployment antenna and the mistiming that relatively electromagnetic wave arrives antenna can determine corresponding separate of arcing initial time, simple, measuring accuracy is high, and with system without electrical connection, safe and reliable, can also distinguish isolating switch A phase, B phase and C there is electric arc in which first in mutually simultaneously.
Accompanying drawing explanation
Fig. 1 is the theory diagram of isolating switch arcing initial time detection system described in the utility model;
Fig. 2 is the placement location schematic diagram of isolating switch arcing initial time detection system in embodiment 1;
Fig. 3 is the received electromagnetic wave signal schematic diagram of oscillograph in embodiment 1;
Fig. 4 is the placement location schematic diagram of isolating switch arcing initial time detection system in embodiment 2.
Embodiment
As shown in Figure 1, isolating switch arcing initial time detection system described in the utility model comprises two electromagnetic wave signal harvesters, the first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch C phase with the distance of isolating switch A phase, and the first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch B phase with the distance of isolating switch B phase; The signal output part of two electromagnetic wave signal harvesters connects respectively oscillograph.For simplification detection method, the utility model also can increase by the 3rd electromagnetic wave signal harvester, the 3rd electromagnetic wave signal harvester is identical with the distance of the first electromagnetic wave signal harvester and isolating switch A phase with the distance of isolating switch B phase, and the signal output part of the 3rd electromagnetic wave signal harvester connects oscillograph.
Electromagnetic wave signal harvester described in the utility model comprises antenna, signal condition amplification module and analog-to-digital conversion module, the signal output part of antenna connects the signal input part of signal condition amplification module, the signal output part of signal condition amplification module connects the signal input part of analog-to-digital conversion module, and the signal output part of analog-to-digital conversion module connects oscillograph.The radio frequency electromagnetic that the switching arc that antenna produces while cut-offfing for gathering isolating switch inspires, and be sent to signal condition amplification module after the signal collecting is converted into voltage signal.In order to guarantee collection effect, antenna adopts plane equiangular spiral radio-frequency antenna, and the Spot detection frequency of plane equiangular spiral radio-frequency antenna, higher than 500MHz, is preferably 500MHz-2GHz, can avoid the interference such as corona of transformer station, and guarantee to capture the signal in wider range.Signal condition amplification module comprises signal conditioner and power amplifier, for the signal that radio-frequency antenna is collected, carry out filtering and amplify and process, elimination radio-frequency antenna in transformer station connects collected Electromagnetic Interference signal, the electromagnetic wave signal that when amplifying isolating switch simultaneously and cut-offfing, switching arc produces, improves signal to noise ratio (S/N ratio).Analog-to-digital conversion module is converted to digital signal for the simulating signal that signal condition amplification module is sent, and digital signal is sent to oscillograph processes.Oscillograph acquisition channel is no less than the quantity of electromagnetic wave signal harvester, and oscillograph sampling rate is not less than 2GHz, and oscillograph is not less than 20mS sweep time under 2GHz sampling rate.
Below in conjunction with specific embodiment to selecting the situation of two and three electromagnetic wave signal harvesters to be further described in the utility model.
Embodiment 1
As shown in Figure 2, in the present embodiment, isolating switch arcing initial time detection system comprises two electromagnetic wave signal harvesters, the radio frequency electromagnetic inspiring for gathering switching arc that isolating switch produces when cut-offfing.The first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch C phase with the distance of isolating switch A phase, and the first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch B phase with the distance of isolating switch B phase.In use procedure, when isolating switch cut-offs, isolating switch A phase, B phase and the C mutually middle switching arc producing will inspire radio frequency electromagnetic, and two electromagnetic wave signal harvesters can accurately collect above-mentioned radio frequency electromagnetic, then are sent to after treatment oscillograph.Isolating switch A phase, B phase and C mutually in each alternate arc time poorly belong to ms magnitude, and arcing electromagnetic impulse belongs to ns magnitude, so the received electromagnetic wave signal of oscillograph is as shown in Figure 3.Wherein, the mistiming between pulse train belongs to ms magnitude, and the mistiming of the pulse that interior the first electromagnetic wave signal harvester of pulse train and the second electromagnetic wave signal harvester collect belongs to ns magnitude.The time that in the received electromagnetic wave signal of oscillograph, each pulse train occurs is the arcing initial time of isolating switch, and its corresponding isolating switch is separate can be determined according to antenna 1 and the mistiming of antenna 2 pulses.
If first oscillograph receives the signal that the first electromagnetic wave signal harvester sends, because the first electromagnetic wave signal harvester is mutually nearest apart from isolating switch A, judge that first electric arc appear in isolating switch A mutually; If first receive the signal that the second electromagnetic wave signal harvester sends, because the second electromagnetic wave signal harvester is mutually nearest apart from isolating switch C, judge that first electric arc appear in isolating switch C mutually; If the signal first receiving is the signal that the first electromagnetic wave signal harvester and the second electromagnetic wave signal harvester send simultaneously, due to the first electromagnetic wave signal harvester and the second electromagnetic wave signal harvester apart from isolating switch B at a distance of from identical, judge that first electric arc appear in isolating switch B mutually.
Embodiment 2
As shown in Figure 4, in the present embodiment, isolating switch arcing initial time detection system comprises three electromagnetic wave signal harvesters, the radio frequency electromagnetic inspiring for gathering switching arc that isolating switch produces when cut-offfing.The first electromagnetic wave signal harvester is all identical with the distance of distance, the second electromagnetic wave signal harvester and the isolating switch C phase of isolating switch A phase and the distance of the 3rd electromagnetic wave signal harvester and isolating switch B phase, and the first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch B phase with the distance of isolating switch B phase.In use procedure, when isolating switch cut-offs, isolating switch A phase, B phase and the C mutually middle switching arc producing will inspire radio frequency electromagnetic, and three electromagnetic wave signal harvesters can accurately collect above-mentioned radio frequency electromagnetic, then are sent to after treatment oscillograph.Isolating switch A phase, B phase and C mutually in the poor ms magnitude that belongs to of each alternate arc time, and arcing electromagnetic impulse belongs to ns magnitude, therefore in the received electromagnetic wave signal of oscillograph, the mistiming between pulse train belongs to ms magnitude, and in pulse train the mistiming of the first electromagnetic wave signal harvester and the second electromagnetic wave signal harvester pulse belong to ns magnitude.With embodiment 1 in like manner, the time that in the received electromagnetic wave signal of oscillograph, each pulse train occurs is the arcing initial time of isolating switch, its corresponding isolating switch is separate can be determined according to antenna 1 and the mistiming of antenna 2 pulses.
If first oscillograph receives the signal that the first electromagnetic wave signal harvester sends, because the first electromagnetic wave signal harvester is mutually nearest apart from isolating switch A, judge that first electric arc appear in isolating switch A mutually; If first receive the signal that the second electromagnetic wave signal harvester sends, because the second electromagnetic wave signal harvester is mutually nearest apart from isolating switch C, judge that first electric arc appear in isolating switch C mutually; If first receive the signal that the 3rd electromagnetic wave signal harvester sends, because the 3rd electromagnetic wave signal harvester is mutually nearest apart from isolating switch B, judge that first electric arc appear in isolating switch B mutually.
First by two or three, the electromagnetic wave signal harvester in diverse location receives the electromagnetic wave signal sending when isolating switch cut-offs to the utility model, then use oscillograph to carry out Treatment Analysis to the signal of electromagnetic wave signal harvester output, finally utilize oscillograph to receive the time of signal and mistiming that different antennae receives signal is determined isolating switch arcing initial time and corresponding separate.Because electromagnetic wave signal harvester is in diverse location, distance apart from each phase of isolating switch is different, it is also different that the electromagnetic wave signal that arcing is sent arrives the time of each antenna, therefore by rational deployment antenna and the mistiming that relatively electromagnetic wave arrives antenna can determine corresponding separate of arcing initial time, simple, measuring accuracy is high, and with system without electrical connection, safe and reliable, can also distinguish isolating switch A phase, B phase and C there is electric arc in which first in mutually simultaneously.

Claims (6)

1. an isolating switch arcing initial time detection system, it is characterized in that: comprise two electromagnetic wave signal harvesters, the first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch C phase with the distance of isolating switch A phase, and the first electromagnetic wave signal harvester is identical with the distance of the second electromagnetic wave signal harvester and isolating switch B phase with the distance of isolating switch B phase; The signal output part of two electromagnetic wave signal harvesters connects respectively oscillograph.
2. isolating switch arcing initial time detection system according to claim 1, it is characterized in that: also comprise the 3rd electromagnetic wave signal harvester, the 3rd electromagnetic wave signal harvester is identical with the distance of the first electromagnetic wave signal harvester and isolating switch A phase with the distance of isolating switch B phase, and the signal output part of the 3rd electromagnetic wave signal harvester connects oscillograph.
3. isolating switch arcing initial time detection system according to claim 1 and 2, it is characterized in that: described electromagnetic wave signal harvester comprises antenna, signal condition amplification module and analog-to-digital conversion module, the signal output part of antenna connects the signal input part of signal condition amplification module, the signal output part of signal condition amplification module connects the signal input part of analog-to-digital conversion module, and the signal output part of analog-to-digital conversion module connects oscillograph.
4. isolating switch arcing initial time detection system according to claim 3, is characterized in that: described signal condition amplification module comprises signal conditioner and power amplifier.
5. isolating switch arcing initial time detection system according to claim 4, is characterized in that: described antenna adopts plane equiangular spiral radio-frequency antenna.
6. isolating switch arcing initial time detection system according to claim 5, is characterized in that: described center of antenna detects frequency higher than 500MHz; Oscillograph acquisition channel is no less than the quantity of electromagnetic wave signal harvester, and oscillograph sampling rate is not less than 2GHz, and oscillograph is not less than 20mS sweep time under 2GHz sampling rate.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103954911A (en) * 2014-05-04 2014-07-30 国家电网公司 Breaker arcing starting time detection system and method
CN106680701A (en) * 2016-11-25 2017-05-17 云南电网有限责任公司电力科学研究院 Circuit breaker re-ignition phenomenon detection device and method
CN107167727A (en) * 2017-05-12 2017-09-15 清华大学 A kind of breaker arcing fault detect and method for early warning

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103954911A (en) * 2014-05-04 2014-07-30 国家电网公司 Breaker arcing starting time detection system and method
CN106680701A (en) * 2016-11-25 2017-05-17 云南电网有限责任公司电力科学研究院 Circuit breaker re-ignition phenomenon detection device and method
CN107167727A (en) * 2017-05-12 2017-09-15 清华大学 A kind of breaker arcing fault detect and method for early warning
CN107167727B (en) * 2017-05-12 2019-09-27 清华大学 A kind of breaker arcing fault detection and method for early warning

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