CN103227457A - Current protection method for power transmission line during single-phase high-resistance ground fault - Google Patents
Current protection method for power transmission line during single-phase high-resistance ground fault Download PDFInfo
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- CN103227457A CN103227457A CN2013101294898A CN201310129489A CN103227457A CN 103227457 A CN103227457 A CN 103227457A CN 2013101294898 A CN2013101294898 A CN 2013101294898A CN 201310129489 A CN201310129489 A CN 201310129489A CN 103227457 A CN103227457 A CN 103227457A
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Abstract
The invention discloses a current protection method for a power transmission line during a single-phase high-resistance ground fault. The method comprises the steps of firstly measuring an instantaneous current value at a mounting part of a current transformer of the power transmission line at each sampling instant, calculating a fundamental component, a second harmonic component, a third harmonic component and a fifth harmonic component in fault phase current of the power transmission line by processing the sampled instantaneous current values with a fourier algorithm, further calculating an amplitude of a harmonic component in the fault phase current, and then judging that the amplitude of the harmonic component in the fault phase current is greater than a product of a setting coefficient and the amplitude of the fundamental component in the fault phase current. The method realizes relay protection for the single-phase high-resistance ground fault of the power transmission line by single-end amperage, and can act correctly and reliably during the single-phase high-resistance ground fault of the power transmission line, and the acting performances are not influenced by transition resistance, a fault location and the load current.
Description
Technical field
The present invention relates to the relay protection of power system technical field, specifically relate to the single-phase high resistance earthing fault current protection method of a kind of transmission line.
Background technology
The additional impedance that transition resistance produces can have a strong impact on the performance of impedance distance protection.If the additional impedance that transition resistance produces is resistance sense, impedance distance protection tripping when then causing the line protection troubles inside the sample space easily; If the additional impedance that transition resistance produces is capacitance-resistance, impedance distance protection action produces and surmounts when then causing the line protection external area error easily.
High/super/the extreme pressure transmission line of alternation current often also is the heavy load transmission line, and the heavy load electric current can make impedance distance protection malfunction or tripping, and the heavy load electric current can not be ignored the influence of impedance distance protection performance.Circuit fault-free under the overload transmission of electricity situation; the measurement impedance of traditional distance protection is owing to be subjected to overload current affects meeting substantial deviation actual measurement impedance; cause the traditional distance protection misoperation easily; cause the grid power blackout expanded range; thereby even cause a large amount of transfer of load to threaten circuits normally to move, caused huge potential safety hazard to power grid security.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists; provide a kind of can correct action message when the single-phase high resistance earthing fault of transmission line, the single-phase high resistance earthing fault current protection method of the transmission line that performance is not influenced by transition resistance, abort situation and load current.
For achieving the above object, the inventive method adopts following technical scheme:
(1) current instantaneous value of each sampling instant of protector measuring transmission line current transformer installation place, and the current instantaneous value that its sampling obtains utilized fundametal compoment in the Fourier algorithm computing electric power line fault phase current
, the second harmonic component in the fault phase current
, the third-harmonic component in the fault phase current
With the quintuple harmonics component in the fault phase current
Wherein, φ=A, B, C phase;
(2) protective device calculates the harmonic current amplitude in the fault phase current
Wherein, φ=A, B, C phase;
(3) protective device is judged
Whether set up, if set up, then protective device, protective device sends the circuit breaker at would trip signal tripping transmission line two ends, exports diagnostic result simultaneously and sends alarm signal if judging that transmission line one-phase earth fault is single-phase high resistance earthing fault; Wherein, k is a tuning coefficient.
Characteristics of the present invention and technological achievement:
The inventive method is at first measured the current instantaneous value of each sampling instant of transmission line current transformer installation place, and the current instantaneous value that its sampling obtains utilized fundametal compoment in the Fourier algorithm computing electric power line fault phase current, second harmonic component in the fault phase current, quintuple harmonics component in third-harmonic component in the fault phase current and the fault phase current, and then the harmonic component amplitude in the calculating fault phase current, whether the harmonic component amplitude in the failure judgement phase current is set up greater than the product of the fundametal compoment amplitude in tuning coefficient and the fault phase current then, if set up, judge that then transmission line one-phase earth fault is single-phase high resistance earthing fault, send the circuit breaker at would trip signal tripping transmission line two ends, export diagnostic result simultaneously and send alarm signal.The inventive method utilizes single end current to realize the relaying protection of the single-phase high resistance earthing fault of transmission line; the inventive method can correct action message during the single-phase high resistance earthing fault of transmission line, and performance is not subjected to the influence of transition resistance, abort situation and load current.
Description of drawings
Fig. 1 is for using circuit transmission system schematic diagram of the present invention.
Embodiment
According to Figure of description technical scheme of the present invention is done further detailed presentations below.
Fig. 1 is for using circuit transmission system schematic diagram of the present invention.CT is a current transformer among Fig. 1.The current instantaneous value of each sampling instant of protector measuring transmission line current transformer installation place, and the current instantaneous value that its sampling obtains utilized fundametal compoment in the Fourier algorithm computing electric power line fault phase current
, the second harmonic component in the fault phase current
, the third-harmonic component in the fault phase current
With the quintuple harmonics component in the fault phase current
, as input variable; Wherein, φ=A phase, B phase, C phase.
Protective device calculates the harmonic current amplitude in the fault phase current
Wherein, φ=A, B, C phase.
Whether the harmonic component amplitude in the protective device failure judgement phase current is set up greater than the product of the fundametal compoment amplitude in tuning coefficient and the fault phase current, promptly judges
Whether set up, if set up, then protective device, protective device sends would trip signal tripping transmission line two ends circuit breaker, exports diagnostic result simultaneously and sends alarm signal if judging that transmission line one-phase earth fault is single-phase high resistance earthing fault; Wherein, k is a tuning coefficient.
The inventive method utilizes single end current to realize the relaying protection of the single-phase high resistance earthing fault of transmission line; the inventive method can correct action message during the single-phase high resistance earthing fault of transmission line, and performance is not subjected to the influence of transition resistance, abort situation and load current.
The above only is a preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (1)
1. the single-phase high resistance earthing fault current protection method of transmission line is characterized in that: comprise following sequential steps:
(1) current instantaneous value of each sampling instant of protector measuring transmission line current transformer installation place, and the current instantaneous value that its sampling obtains utilized fundametal compoment in the Fourier algorithm computing electric power line fault phase current
, the second harmonic component in the fault phase current
, the third-harmonic component in the fault phase current
With the quintuple harmonics component in the fault phase current
Wherein, φ=A, B, C phase;
(2) protective device calculates the harmonic current amplitude in the fault phase current
Wherein, φ=A, B, C phase;
(3) protective device is judged
Whether set up, if set up, then protective device, protective device sends the circuit breaker at would trip signal tripping transmission line two ends, exports diagnostic result simultaneously and sends alarm signal if judging that transmission line one-phase earth fault is single-phase high resistance earthing fault; Wherein, k is a tuning coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310129489.8A CN103227457B (en) | 2013-04-15 | 2013-04-15 | Transmitting line single-phase high-impedance current protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310129489.8A CN103227457B (en) | 2013-04-15 | 2013-04-15 | Transmitting line single-phase high-impedance current protection method |
Publications (2)
| Publication Number | Publication Date |
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| CN103227457A true CN103227457A (en) | 2013-07-31 |
| CN103227457B CN103227457B (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310129489.8A Active CN103227457B (en) | 2013-04-15 | 2013-04-15 | Transmitting line single-phase high-impedance current protection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089098A (en) * | 2021-10-25 | 2022-02-25 | 珠海许继电气有限公司 | Power distribution network fault type identification method and device |
Citations (4)
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| CN1588737A (en) * | 2004-09-17 | 2005-03-02 | 福州大学 | Same lever/parallel double loop high resistance earthing protecting method and device |
| CN101187687A (en) * | 2007-12-21 | 2008-05-28 | 清华大学 | High resistance earthing fault detection method based on transient traveling wave |
| US20110075304A1 (en) * | 2009-09-30 | 2011-03-31 | Chevron U.S.A. Inc. | System and method for polyphase ground-fault circuit-interrupters |
| CN102545197A (en) * | 2011-12-28 | 2012-07-04 | 北京潞能麒麟电力设备有限公司 | Low-current grounding protection method and device on basis of active excitation differential state principle |
-
2013
- 2013-04-15 CN CN201310129489.8A patent/CN103227457B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1588737A (en) * | 2004-09-17 | 2005-03-02 | 福州大学 | Same lever/parallel double loop high resistance earthing protecting method and device |
| CN101187687A (en) * | 2007-12-21 | 2008-05-28 | 清华大学 | High resistance earthing fault detection method based on transient traveling wave |
| US20110075304A1 (en) * | 2009-09-30 | 2011-03-31 | Chevron U.S.A. Inc. | System and method for polyphase ground-fault circuit-interrupters |
| CN102545197A (en) * | 2011-12-28 | 2012-07-04 | 北京潞能麒麟电力设备有限公司 | Low-current grounding protection method and device on basis of active excitation differential state principle |
Non-Patent Citations (2)
| Title |
|---|
| 陈佳佳等: "利用单端暂态量检测单相高阻接地故障的新方法", 《电力***自动化》 * |
| 陈佳佳等: "检测单相高阻接地故障的新方法及可靠性验证", 《水电能源科学》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089098A (en) * | 2021-10-25 | 2022-02-25 | 珠海许继电气有限公司 | Power distribution network fault type identification method and device |
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| CN103227457B (en) | 2016-06-01 |
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