CN103954911A - Breaker arcing starting time detection system and method - Google Patents

Breaker arcing starting time detection system and method Download PDF

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Publication number
CN103954911A
CN103954911A CN201410183698.5A CN201410183698A CN103954911A CN 103954911 A CN103954911 A CN 103954911A CN 201410183698 A CN201410183698 A CN 201410183698A CN 103954911 A CN103954911 A CN 103954911A
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China
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electromagnetic wave
isolating switch
wave signal
signal
harvester
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CN201410183698.5A
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Chinese (zh)
Inventor
黄兴泉
王伟
张欲晓
彭博
郭琳
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国家电网公司
国网河南省电力公司电力科学研究院
华北电力大学
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Priority to CN201410183698.5A priority Critical patent/CN103954911A/en
Publication of CN103954911A publication Critical patent/CN103954911A/en

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Abstract

The invention discloses a breaker arcing starting time detection system. The breaker arcing starting time detection system comprises two electromagnetic wave signal acquisition devices. The distance between the first electromagnetic wave signal acquisition device and the Phase A of a breaker is the same as the distance between the second electromagnetic wave signal acquisition device and the Phase C of the breaker, and the distance between the first electromagnetic wave signal acquisition device and the Phase B of the breaker is the same as the distance between the second electromagnetic wave signal acquisition device and the Phase B of the breaker. The signal output ends of the two electromagnetic wave signal acquisition devices are respectively connected with an oscilloscope. According to the system, the phase corresponding to arcing starting time can be determined by reasonably arranging antennas and comparing the time difference of electromagnetic waves for reaching the antennas, the system is simple, feasible, high in measurement accuracy, free of electrical connection, safe and reliable, and meanwhile it can be distinguished that which one of the Phase A, the Phase B and the Phase C of the breaker firstly generates electric arcs.

Description

A kind of isolating switch arcing initial time detection system and detection method
Technical field
The present invention relates to a kind of measuring system and measuring method that is applied to power transformation field, relate in particular to a kind of isolating switch arcing initial time detection system and detection method.
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 mark 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, therefore 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, no longer presents Sine distribution owing to playing a post-arc current, 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.
Summary of the invention
The object of this invention is to provide a kind of isolating switch arcing initial time detection system and detection method, isolating switch arcing initial time and corresponding separate, simple can be detected fast and accurately, measuring accuracy is high, and with system without electrical connection, safe and reliable.
The present invention 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.
One utilizes isolating switch arcing initial time detection system described in claim 1 to carry out isolating switch arcing initial time detection method, comprises the following steps:
A: two electromagnetic wave signal harvesters are set respectively, the radio frequency electromagnetic inspiring because producing switching arc in the time cut-offfing for gathering isolating switch, 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; Then the signal output part of two electromagnetic wave signal harvesters is connected respectively to oscillograph;
B: utilize oscillograph to receive the signal that the first electromagnetic wave signal harvester and the second electromagnetic wave signal harvester collect, and judge the sequencing of the received signal of oscillograph, if first receive the signal that the first electromagnetic wave signal harvester sends, judge that first electric arc appear in isolating switch A mutually; If first receive the signal that the second electromagnetic wave signal harvester sends, 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, judge that first electric arc appear in isolating switch B mutually.
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.
One utilizes isolating switch arcing initial time detection system described in claim 2 to carry out isolating switch arcing initial time detection method, comprises the following steps:
A: three electromagnetic wave signal harvesters are set respectively, the radio frequency electromagnetic inspiring because producing switching arc in the time cut-offfing for gathering isolating switch, 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; Then the signal output part of three electromagnetic wave signal harvesters is connected respectively to oscillograph;
B: utilize oscillograph to receive the first electromagnetic wave signal harvester, the second electromagnetic wave signal harvester and the 3rd signal collecting, and judge the sequencing of the received signal of oscillograph, if first receive the signal that the first electromagnetic wave signal harvester sends, judge that first electric arc appear in isolating switch A mutually; If first receive the signal that the second electromagnetic wave signal harvester sends, judge that first electric arc appear in isolating switch C mutually; If first receive the signal that the 3rd electromagnetic wave signal harvester sends, judge that first electric arc appear in isolating switch B mutually.
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.
By two or three, the electromagnetic wave signal harvester in diverse location receives the electromagnetic wave signal sending when isolating switch cut-offs in the present invention, then use oscillograph to carry out Treatment Analysis to the signal of electromagnetic wave signal harvester output, finally utilize oscillograph to receive the mistiming that time of signal and different antennae receive signal and determine isolating switch arcing initial time and corresponding separate.Because electromagnetic wave signal harvester is in diverse location, apart from the distance difference of the each phase of isolating switch, 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.
Brief description of the drawings
Fig. 1 is the theory diagram of isolating switch arcing initial time detection system of the present invention;
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;
Fig. 5 is the process flow diagram that utilizes two electromagnetic wave signal harvesters to carry out isolating switch arcing initial time detection method of the present invention;
Fig. 6 is the process flow diagram that utilizes three electromagnetic wave signal harvesters to carry out isolating switch arcing initial time detection method of the present invention.
Embodiment
As shown in Figure 1, isolating switch arcing initial time detection system of the present invention 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 present invention 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 of the present invention 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 ensure 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 the corona of transformer station, and guarantee to capture the signal in wider range.Signal condition amplification module comprises signal conditioner and power amplifier, carry out filtering and amplify and process for the signal that radio-frequency antenna is collected, eliminate radio-frequency antenna in transformer station and connect 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, the situation of selecting two and three electromagnetic wave signal harvesters in the present invention is further described.
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 in the time 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, in the time that 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 in mutually each alternate arc time poorly belong to ms magnitude, and arcing electromagnetic impulse belongs to ns magnitude, therefore the received electromagnetic wave signal of oscillograph 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 in the time 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, in the time that 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 be the poor ms magnitude that belongs to of each alternate arc time in mutually, 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 in the present invention, then use oscillograph to carry out Treatment Analysis to the signal of electromagnetic wave signal harvester output, finally utilize oscillograph to receive the mistiming that time of signal and different antennae receive signal and determine isolating switch arcing initial time and corresponding separate.Because electromagnetic wave signal harvester is in diverse location, apart from the distance difference of the each phase of isolating switch, 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.
The detection method of two kinds of isolating switch arcing initial times of the present invention, two the electromagnetic wave signal harvesters that utilize that are respectively as described in Figure 5 carry out the detection method of isolating switch arcing initial time, and three the electromagnetic wave signal harvesters that utilize as shown in Figure 6 carry out the detection method of isolating switch arcing initial time, relevant narration above in embodiment 1 and embodiment 2 is described in detail, does not repeat them here.

Claims (10)

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.
7. utilize isolating switch arcing initial time detection system described in claim 1 to carry out an isolating switch arcing initial time detection method, it is characterized in that, comprise the following steps:
A: two electromagnetic wave signal harvesters are set respectively, the radio frequency electromagnetic inspiring because producing switching arc in the time cut-offfing for gathering isolating switch, 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; Then the signal output part of two electromagnetic wave signal harvesters is connected respectively to oscillograph;
B: utilize oscillograph to receive the signal that the first electromagnetic wave signal harvester and the second electromagnetic wave signal harvester collect, and judge the sequencing of the received signal of oscillograph, if first receive the signal that the first electromagnetic wave signal harvester sends, judge that first electric arc appear in isolating switch A mutually; If first receive the signal that the second electromagnetic wave signal harvester sends, 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, judge that first electric arc appear in isolating switch B mutually.
8. isolating switch arcing initial time detection method according to claim 7, 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.
9. utilize isolating switch arcing initial time detection system described in claim 2 to carry out an isolating switch arcing initial time detection method, it is characterized in that, comprise the following steps:
A: three electromagnetic wave signal harvesters are set respectively, the radio frequency electromagnetic inspiring because producing switching arc in the time cut-offfing for gathering isolating switch, 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; Then the signal output part of three electromagnetic wave signal harvesters is connected respectively to oscillograph;
B: utilize oscillograph to receive the first electromagnetic wave signal harvester, the second electromagnetic wave signal harvester and the 3rd signal collecting, and judge the sequencing of the received signal of oscillograph, if first receive the signal that the first electromagnetic wave signal harvester sends, judge that first electric arc appear in isolating switch A mutually; If first receive the signal that the second electromagnetic wave signal harvester sends, judge that first electric arc appear in isolating switch C mutually; If first receive the signal that the 3rd electromagnetic wave signal harvester sends, judge that first electric arc appear in isolating switch B mutually.
10. isolating switch arcing initial time detection method according to claim 9, 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.
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CN106842012A (en) * 2017-02-10 2017-06-13 云南电网有限责任公司电力科学研究院 A kind of separate decision method of live detection
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CN107167727A (en) * 2017-05-12 2017-09-15 清华大学 A kind of breaker arcing fault detect and method for early warning
CN107561435A (en) * 2017-08-31 2018-01-09 中国南方电网有限责任公司 A kind of breaker arcing moment method of discrimination and system based on C-V characteristic
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Application publication date: 20140730