CN108414843A - The method of discrimination of the direct lightning strike and inductive lightning of electric-field sensor is integrated based on optics - Google Patents
The method of discrimination of the direct lightning strike and inductive lightning of electric-field sensor is integrated based on optics Download PDFInfo
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- CN108414843A CN108414843A CN201810191493.XA CN201810191493A CN108414843A CN 108414843 A CN108414843 A CN 108414843A CN 201810191493 A CN201810191493 A CN 201810191493A CN 108414843 A CN108414843 A CN 108414843A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
- G01R29/0885—Sensors; antennas; probes; detectors using optical probes, e.g. electro-optical, luminiscent, glow discharge, or optical interferometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
Abstract
The present invention relates to a kind of method of discrimination for the direct lightning strike and inductive lightning integrating electric-field sensor based on optics, belong to fault identification technical field.The method of the present invention integrates the measurement data of electric-field sensor based on optics, pass through the methods of filtering, overvoltage extraction, decoupling, the lightning surge at the independent insulator both ends of three-phase is separated from original waveform, direct lightning strike and inductive lightning are differentiated according to the polarity of three-phase lightning surge.This method has installation convenient test, the high advantage of fault recognition rate through actual verification.
Description
Technical field
The present invention relates to a kind of method of discrimination for the direct lightning strike and inductive lightning integrating electric-field sensor based on optics, belong to event
Hinder identification technology field.
Background technology
High pressure overhead power line is important component in electric system, and distribution is very wide, crisscross, it is hundreds of to be continuous
In so thousands of kilometers, so being easily struck by lightning.Lightning surge, which is divided into, attacks lightning overvoltage and lightning induced voltage directly.Direct lightning strike
Refer to that thunder and lightning directly hits electrical equipment, circuit or building, causing powerful lightning current to flow through these objects causes entire
System overvoltage；Inductive lightning refers to thundercloud over the ground in discharge process, and change dramatically occurs for the electromagnetic field of discharge channel surrounding space,
Nearby lightning induced voltage is generated on conductor.
Statistics shows that high pressure overhead power line tripping times caused by being struck by lightning in China's account for the total tripping times of operation
40%-70%.For the ultra-high-tension power transmission line more than 110kV, direct attack lightning overvoltage is the most serious to the danger of line insulation,
But it only accounts for the 10% of strike mechanism.China's primary power distribution 6~35kV of net power grids are since the overwhelming majority is without earth-wire protection, itself is absolutely
Edge level is relatively low, and lightening hazard most easily occurs, and low-voltage distribution system failure rate caused by inductive lightning is more than 90%.Lightning stroke may
Cause line switching tripping to cause power outage, can also electrical equipment be caused to damage, even result in electric system disintegrate etc. it is pernicious
Accident causes great economic loss, seriously affects stability, reliability, safety and the economy of Operation of Electric Systems.
The mechanism generated due to direct lightning strike and inductive lightning is different, caused by fault type and preventive means it is also different,
Therefore direct lightning strike and inductive lightning should be recognized, foundation is provided for lightning Protection Design, targetedly takes lightning protection measures, can be carried
Elevated track lightning protection is horizontal.
Invention content
Purpose of the present invention is to propose a kind of method of discrimination for the direct lightning strike and inductive lightning integrating electric-field sensor based on optics,
The measurement data that electric-field sensor is integrated based on optics, it is by the methods of filtering, overvoltage extraction, decoupling, three-phase is independent
The lightning surge at insulator both ends is separated from original waveform, is attacked directly according to the polarity of three-phase lightning surge to differentiate
Thunder and inductive lightning.
The method of discrimination of the direct lightning strike and inductive lightning proposed by the present invention that electric-field sensor is integrated based on optics, including it is following
Step：
(1) three optics are integrated into the underface that electric-field sensor is separately mounted to circuit to be measured in substation, makes three
The terrain clearance that platform optics integrates electric-field sensor is identical, and the polarity direction for making three optics integrate electric-field sensor is consistent,
Electric-field sensor thang-kng is integrated to three optics respectively, to monitor the waveform of lightning surge on circuit to be measured on-line；
(2) when circuit to be measured has direct lightning strike or inductive lightning occurs, three optics integrate electric-field sensor and survey respectively
Electric field waveform is measured, which is formed by stacking by lightning surge electric field waveform and three-phase main-frequency electric field waveform, is utilized
Wavelet transformation or average filter method, the electric field waveform obtained to measurement are filtered, and obtain filtered electric field waveform,
And the electric field waveform obtained to measurement is multiplied by the conversion factor that respective optical integrates electric-field sensor respectively, obtains measuring voltage wave
Shape, wherein the conversion factor that optics integrates electric-field sensor is to measure actual voltage value corresponding when electric field is 1V/m；
(3) by the measurement voltage waveform of above-mentioned steps (2), electric-field sensor is integrated not with by three optics in substation
The power frequency voltage waveform under same-phase is obtained to route survey to be measured to subtract each other, obtain the mutual of circuit to be measured when being struck by lightning
Couple three-phase lightning surge waveform；
(4) above-mentioned mutual coupling three-phase lightning surge waveform is decoupled, if mutual couples three-phase lightning surge
Waveform is UA、UB、UC, the three-phase lightning surge waveform after decoupling is Ua、Ub、Uc, establish following decoupling equation：
Wherein, qijFor decoupling coefficient, i=1,2,3, j=1,2,3, qij∈ [0,100]；
(5) to the three-phase lightning surge waveform U after decouplinga、Ub、UcPolarity judged, if three-phase lightning surge
Waveform Ua、Ub、UcPolarity it is identical, then judge that inductive lightning has occurred in circuit to be measured, if three-phase lightning surge waveform Ua、Ub、
UcPolarity it is different, then judge that direct lightning strike has occurred on circuit to be measured.
The method of discrimination of the direct lightning strike and inductive lightning proposed by the present invention that electric-field sensor is integrated based on optics, advantage
It is：
1, electric-field sensor is integrated using optics in the method for the present invention, there is the characteristics of easy for installation, to be convenient for measuring.
2, the method for the present invention can effectively differentiate direct lightning strike and inductive lightning on circuit to be measured through actual verification.
Specific implementation mode
The method of discrimination of the direct lightning strike and inductive lightning proposed by the present invention that electric-field sensor is integrated based on optics, including it is following
Step：
(1) by the integrated electric-field sensor of three optics, (in one embodiment of the present of invention, the three phase optical used is integrated electric
Field sensor is produced by Tsinghua University, reference can be made to the Chinese patent application of Publication No. CN102854403B) it is separately mounted to become
The underface of circuit to be measured in power station keeps the terrain clearance that three optics integrate electric-field sensor identical, and makes three optics
The polarity of integrated electric-field sensor integrates electric-field sensor thang-kng to three optics respectively towards unanimously, to be measured to monitor on-line
Measure the waveform of lightning surge on circuit；
(2) when circuit to be measured has direct lightning strike or inductive lightning occurs, three optics integrate electric-field sensor and survey respectively
Electric field waveform is measured, which is formed by stacking by lightning surge electric field waveform and three-phase main-frequency electric field waveform, is utilized
Wavelet transformation or average filter method, the electric field waveform obtained to measurement are filtered, and obtain filtered electric field waveform,
And the electric field waveform obtained to measurement is multiplied by the conversion factor that respective optical integrates electric-field sensor respectively, obtains measuring voltage wave
Shape, wherein the conversion factor that optics integrates electric-field sensor is to measure actual voltage value corresponding when electric field is 1V/m；
(3) by the measurement voltage waveform of above-mentioned steps (2), electric-field sensor is integrated not with by three optics in substation
The power frequency voltage waveform under same-phase is obtained to route survey to be measured to subtract each other, obtain the mutual of circuit to be measured when being struck by lightning
Couple three-phase lightning surge waveform；
(4) above-mentioned mutual coupling three-phase lightning surge waveform is decoupled, if mutual couples three-phase lightning surge
Waveform is UA、UB、UC, the three-phase lightning surge waveform after decoupling is Ua、Ub、Uc, establish following decoupling equation：
Wherein, qijFor decoupling coefficient, i=1,2,3, j=1,2,3, qij∈ [0,100]；
(5) to the three-phase lightning surge waveform U after decouplinga、Ub、UcPolarity judged, if three-phase lightning surge
Waveform Ua、Ub、UcPolarity it is identical, then judge that inductive lightning has occurred in circuit to be measured, if three-phase lightning surge waveform Ua、Ub、
UcPolarity it is different, then judge that direct lightning strike has occurred on circuit to be measured.
Claims (1)
1. a kind of method of discrimination for the direct lightning strike and inductive lightning integrating electric-field sensor based on optics, it is characterised in that this method packet
Include following steps：
(1) three optics are integrated into the underface that electric-field sensor is separately mounted to circuit to be measured in substation, makes three light
The terrain clearance for learning integrated electric-field sensor is identical, and the polarity direction for making three optics integrate electric-field sensor is consistent, respectively
Electric-field sensor thang-kng is integrated to three optics, to monitor the waveform of lightning surge on circuit to be measured on-line；
(2) when circuit to be measured has direct lightning strike or inductive lightning occurs, three optics integrate electric-field sensor and measure respectively
To electric field waveform, which is formed by stacking by lightning surge electric field waveform and three-phase main-frequency electric field waveform, utilizes small echo
Variation or average filter method, the electric field waveform obtained to measurement are filtered, and obtain filtered electric field waveform, and right
It measures obtained electric field waveform and is multiplied by the conversion factor that respective optical integrates electric-field sensor respectively, obtain measuring voltage waveform,
Wherein, the conversion factor that optics integrates electric-field sensor is to measure actual voltage value corresponding when electric field is 1V/m；
(3) by the measurement voltage waveform of above-mentioned steps (2), do not occurring with electric-field sensor is integrated by three optics in substation
The power frequency voltage waveform under same-phase is obtained to route survey to be measured to subtract each other, obtain the mutual coupling of circuit to be measured when lightning stroke
Three-phase lightning surge waveform；
(4) above-mentioned mutual coupling three-phase lightning surge waveform is decoupled, if mutual couples three-phase lightning surge waveform
For UA、UB、UC, the three-phase lightning surge waveform after decoupling is Ua、Ub、Uc, establish following decoupling equation：
Wherein, qijFor decoupling coefficient, i=1,2,3, j=1,2,3, qij∈ [0,100]；
(5) to the three-phase lightning surge waveform U after decouplinga、Ub、UcPolarity judged, if three-phase lightning surge waveform
Ua、Ub、UcPolarity it is identical, then judge that inductive lightning has occurred in circuit to be measured, if three-phase lightning surge waveform Ua、Ub、Uc's
Polarity is different, then judges that direct lightning strike has occurred on circuit to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810191493.XA CN108414843B (en) | 2018-03-08 | 2018-03-08 | Method for discriminating direct lightning strike from inductive lightning strike based on optical integrated electric field sensor |
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| CN201810191493.XA CN108414843B (en) | 2018-03-08 | 2018-03-08 | Method for discriminating direct lightning strike from inductive lightning strike based on optical integrated electric field sensor |
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| CN108414843B CN108414843B (en) | 2020-02-07 |
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Citations (8)
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|---|---|---|---|---|
| CN101937015A (en) * | 2010-08-27 | 2011-01-05 | 西安交通大学 | Device for online monitoring lightning current and lightning voltage waveform parameters of overhead transmission line |
| CN102539902A (en) * | 2012-02-23 | 2012-07-04 | 广东电网公司电力科学研究院 | Method for identifying direct lightning strike and inductive lightning strike of transmission line based on direct measurement of traveling wave |
| CN103412185A (en) * | 2013-08-23 | 2013-11-27 | 国家电网公司 | Lightning current detecting device |
| CN103543386A (en) * | 2013-10-16 | 2014-01-29 | 清华大学 | Lightning strike positioning method of power transmission line |
| JP2014082920A (en) * | 2012-10-15 | 2014-05-08 | Omni Lps Co Ltd | Combined impulse current generator |
| US20140173891A1 (en) * | 2012-12-21 | 2014-06-26 | Murray W. Davis | Portable self powered line mountable electric power line and environment parameter monitoring transmitting and receiving system |
| CN206208980U (en) * | 2016-11-29 | 2017-05-31 | 沈阳铁路信号有限责任公司 | railway station machine room lightning monitoring system |
| CN107402329A (en) * | 2017-07-05 | 2017-11-28 | 南京信息工程大学 | Single station lightning electric field positioner and method |
-
2018
- 2018-03-08 CN CN201810191493.XA patent/CN108414843B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937015A (en) * | 2010-08-27 | 2011-01-05 | 西安交通大学 | Device for online monitoring lightning current and lightning voltage waveform parameters of overhead transmission line |
| CN102539902A (en) * | 2012-02-23 | 2012-07-04 | 广东电网公司电力科学研究院 | Method for identifying direct lightning strike and inductive lightning strike of transmission line based on direct measurement of traveling wave |
| JP2014082920A (en) * | 2012-10-15 | 2014-05-08 | Omni Lps Co Ltd | Combined impulse current generator |
| US20140173891A1 (en) * | 2012-12-21 | 2014-06-26 | Murray W. Davis | Portable self powered line mountable electric power line and environment parameter monitoring transmitting and receiving system |
| CN103412185A (en) * | 2013-08-23 | 2013-11-27 | 国家电网公司 | Lightning current detecting device |
| CN103543386A (en) * | 2013-10-16 | 2014-01-29 | 清华大学 | Lightning strike positioning method of power transmission line |
| CN206208980U (en) * | 2016-11-29 | 2017-05-31 | 沈阳铁路信号有限责任公司 | railway station machine room lightning monitoring system |
| CN107402329A (en) * | 2017-07-05 | 2017-11-28 | 南京信息工程大学 | Single station lightning electric field positioner and method |
Non-Patent Citations (2)
| Title |
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| 李天鸷 等: "500kV架空线直击和感应雷暂态过电压计算", 《四川电力技术》 * |
| 王希 等: "10kV配电线路的雷电感应过电压特性", 《高电压技术》 * |
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Effective date of registration: 20210823 Address after: 510700 3 / F, 4 / F, 5 / F, building J1 and 3 / F, building J3, No. 11, Kexiang Road, Huangpu District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Patentee after: TSINGHUA University Address before: 510080 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: TSINGHUA University Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |
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