CN103227457B - Transmitting line single-phase high-impedance current protection method - Google Patents
Transmitting line single-phase high-impedance current protection method Download PDFInfo
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- CN103227457B CN103227457B CN201310129489.8A CN201310129489A CN103227457B CN 103227457 B CN103227457 B CN 103227457B CN 201310129489 A CN201310129489 A CN 201310129489A CN 103227457 B CN103227457 B CN 103227457B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims abstract description 5
- 230000001012 protector Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000007704 transition Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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Abstract
The present invention discloses a kind of transmitting line single-phase high-impedance current protection method. First the inventive method measures the current instantaneous value of each sampling instant of transmitting line current transformer installation place, and the current instantaneous value that its sampling obtains is utilized the second harmonic component in the base wavelength-division amount in Fourier algorithm computing electric power line fault phase current, fault phase current, the third-harmonic component in fault phase current and five order harmonic components in fault phase current, and then the harmonic component amplitude calculated in fault phase current, the then product of the base ripple component amplitude that the harmonic component amplitude in failure judgement phase current is greater than in tuning coefficient and fault phase current. The inventive method utilizes single end current to achieve the relaying of transmitting line single-phase high-impedance; the inventive method energy correct action message during transmitting line single-phase high-impedance, performance is by the impact of transition resistance, position of fault and load electric current.<!--1-->
Description
Technical field
The present invention relates to relay protection of power system technical field, specifically relate to a kind of transmitting line single-phase high-impedance current protection method.
Background technology
The additional impedance that transition resistance produces can seriously affect the performance of impedance distance protection. If the additional impedance that transition resistance produces be resistance sense, then when easily causing transmitting line protective belt internal fault, impedance is apart from relay fail; If transition resistance produce additional impedance be capacitance-resistance, then easily cause transmitting line protection external area error time impedance distance protection act generation surmount.
High/super/extreme pressure transmission line of alternation current is also often heavy loading transmitting line, and heavy loading electric current can make impedance distance false protection or tripping, and the impact of impedance distance Perfomance of protective relaying can not be ignored by heavy loading electric current. Overload transmission of electricity situation line trouble free; the measurement impedance of traditional distance protection is owing to affecting the meeting actual measurement impedance of substantial deviation by overload electric current; easily cause traditional distance protection flase operation; cause grid power blackout range extension; even cause load to shift in a large number thus threaten circuit normally to run, cause huge potential safety hazard to power grid security.
Summary of the invention
It is an object of the invention to overcome the deficiency of prior art existence; there is provided the one correct action message of the energy when transmitting line single-phase high-impedance, the transmitting line single-phase high-impedance current protection method that performance does not affect by transition resistance, position of fault and load electric current.
For achieving the above object, the inventive method adopts following technical scheme:
(1) current instantaneous value of each sampling instant of protector measuring transmitting line current transformer installation place, and the current instantaneous value that its sampling obtains is utilized the base wavelength-division amount in Fourier algorithm computing electric power line fault phase current, second harmonic component in fault phase current, third-harmonic component in fault phase currentWith five order harmonic components in fault phase current; Wherein, ��=A, B, C phase;
(2) protector calculates the harmonic current amplitude in fault phase current; Wherein, ��=A, B, C phase;
(3) protector judgesWhether setting up, if setting up, then protector, and protector sends the isolating switch at action trip signal tripping transmitting line two ends, export diagnostic result simultaneously and send alarm signal if judging that transmission line one-phase earth fault is single-phase high-impedance; Wherein, k is tuning coefficient.
The feature of the present invention and technological achievement:
First the inventive method measures the current instantaneous value of each sampling instant of transmitting line current transformer installation place, and the current instantaneous value that its sampling obtains is utilized the base wavelength-division amount in Fourier algorithm computing electric power line fault phase current, second harmonic component in fault phase current, third-harmonic component in fault phase current and five order harmonic components in fault phase current, and then the harmonic component amplitude calculated in fault phase current, then whether the product of the base ripple component amplitude that the harmonic component amplitude in failure judgement phase current is greater than in tuning coefficient and fault phase current is set up, if setting up, then judge that transmission line one-phase earth fault is single-phase high-impedance, send the isolating switch at action trip signal tripping transmitting line two ends, export diagnostic result simultaneously and send alarm signal. the inventive method utilizes single end current to achieve the relaying of transmitting line single-phase high-impedance, the inventive method energy correct action message during transmitting line single-phase high-impedance, performance is by the impact of transition resistance, position of fault and load electric current.
Accompanying drawing explanation
Fig. 1 is the multi-line power transmission system schematic of application the present invention.
Embodiment
According to Figure of description, the technical scheme of the present invention is expressed in further detail below.
Fig. 1 is the multi-line power transmission system schematic of application the present invention. In Fig. 1, CT is current transformer. The current instantaneous value of each sampling instant of protector measuring transmitting line current transformer installation place, and the current instantaneous value that its sampling obtains is utilized the base wavelength-division amount in Fourier algorithm computing electric power line fault phase current, second harmonic component in fault phase current, third-harmonic component in fault phase currentWith five order harmonic components in fault phase current, as input; Wherein, ��=A phase, B phase, C phase.
Protector calculates the harmonic current amplitude in fault phase current; Wherein, ��=A, B, C phase.
Whether the product of the base ripple component amplitude that the harmonic component amplitude in protector failure judgement phase current is greater than in tuning coefficient and fault phase current is set up, and namely judgesWhether setting up, if setting up, then protector, and protector sends action trip signal tripping transmitting line two ends isolating switch, export diagnostic result simultaneously and send alarm signal if judging that transmission line one-phase earth fault is single-phase high-impedance; Wherein, k is tuning coefficient.
The inventive method utilizes single end current to achieve the relaying of transmitting line single-phase high-impedance; the inventive method energy correct action message during transmitting line single-phase high-impedance, performance is by the impact of transition resistance, position of fault and load electric current.
The foregoing is only the preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; any it is familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (1)
1. transmitting line single-phase high-impedance current protection method, it is characterised in that: comprise following sequential steps:
(1) current instantaneous value of each sampling instant of protector measuring transmitting line current transformer installation place, and the current instantaneous value that its sampling obtains is utilized the base wavelength-division amount in Fourier algorithm computing electric power line fault phase current, second harmonic component in fault phase current, third-harmonic component in fault phase currentWith five order harmonic components in fault phase current; Wherein, ��=A, B, C phase;
(2) protector calculates the harmonic current amplitude in fault phase current; Wherein, ��=A, B, C phase;
(3) protector judgesWhether setting up, if setting up, then protector, and protector sends the isolating switch at action trip signal tripping transmitting line two ends, export diagnostic result simultaneously and send alarm signal if judging that transmission line one-phase earth fault is single-phase high-impedance; Wherein, k is 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 |
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| Publication Number | Publication Date |
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| CN103227457A CN103227457A (en) | 2013-07-31 |
| CN103227457B true CN103227457B (en) | 2016-06-01 |
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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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 (3)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8300369B2 (en) * | 2009-09-30 | 2012-10-30 | Chevron U.S.A. Inc. | System and method for polyphase ground-fault circuit-interrupters |
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2013
- 2013-04-15 CN CN201310129489.8A patent/CN103227457B/en active Active
Patent Citations (3)
| 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 |
| 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 |
|---|
| 利用单端暂态量检测单相高阻接地故障的新方法;陈佳佳等;《电力***自动化》;20070510;第31卷(第9期);第56-60页以及第86页 * |
| 检测单相高阻接地故障的新方法及可靠性验证;陈佳佳等;《水电能源科学》;20070430;第25卷(第2期);第87-91页 * |
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