CN103296653A - Single-phase high-impedance grounding fault relay protection method of power transmission line - Google Patents
Single-phase high-impedance grounding fault relay protection method of power transmission line Download PDFInfo
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- CN103296653A CN103296653A CN2013101850579A CN201310185057A CN103296653A CN 103296653 A CN103296653 A CN 103296653A CN 2013101850579 A CN2013101850579 A CN 2013101850579A CN 201310185057 A CN201310185057 A CN 201310185057A CN 103296653 A CN103296653 A CN 103296653A
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Abstract
The invention discloses a kind of transmission line of electricity single-phase high-impedance relay protecting methods. The method of the present invention measures the current instantaneous value of each sampling instant of transmission line of electricity current transformer installation place first, differential is carried out to the faulted phase current waveform instantaneous value of each sampling instant to differentiate processing, then choose the corresponding differential derivative value of faulted phase current instantaneous value of t sampling instant with
The corresponding differential derivative value of the faulted phase current instantaneous value of sampling instant constitutes relay protection criterion, judges whether transmission line of electricity occurs single-phase high-impedance. The method of the present invention realizes transmission line of electricity single-phase high-impedance relay protection using single end current; the correct action message of the method for the present invention energy, action performance are not influenced by transition resistance, abort situation and load current when transmission line of electricity single-phase high-impedance.
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 relay protecting 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 impedance distance protection tripping when causing the line protection troubles inside the sample space easily that the additional impedance that transition resistance produces is resistance sense; If producing, impedance distance protection action that the additional impedance that transition resistance produces is capacitance-resistance when causing the line protection external area error easily surmounts.
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 transmission line single-phase high resistance earthing fault relay protecting method.The inventive method is at first measured the current instantaneous value of each sampling instant of transmission line current transformer installation place, the fault phase current waveform instantaneous value of each sampling instant is carried out the differential processing of differentiating, choose then the t sampling instant fault phase current instantaneous value correspondence the differential derivative value and
The differential derivative value of the fault phase current instantaneous value correspondence of sampling instant constitutes the relaying protection criterion, whether transmission line single-phase high resistance earthing fault is taken place judge.The inventive method utilizes single end current to realize the single-phase high resistance earthing fault relaying protection 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.
For achieving the above object, the inventive method adopts following technical scheme:
The single-phase high resistance earthing fault relay protecting method of transmission line is characterized in that, comprises following sequential steps:
(1) current instantaneous value of each sampling instant of protector measuring transmission line current transformer installation place, Δ t increases progressively with the time in sampling interval, calculates the corresponding differential derivative value of transmission line malfunction phase current instantaneous value i (t) of each t sampling instant successively
Wherein, t is sampling instant; I (t) is the fault phase current waveform sampled value of t sampling instant; I (t-Δ t) is the fault phase current waveform sampled value of t-Δ t sampling instant; Δ t is the time in sampling interval;
(2) protective device is judged
Whether set up, if set up, then protective device sends the would trip signal, the circuit breaker at tripping transmission line two ends; Wherein,
For
The fault phase current waveform sampled value of sampling instant;
For
The fault phase current waveform sampled value of sampling instant; T is sampling instant; T is the time in first-harmonic sampling period; Δ t is the time in sampling interval; K is 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, the fault phase current waveform instantaneous value of each sampling instant is carried out the differential processing of differentiating, choose then the t sampling instant fault phase current instantaneous value correspondence the differential derivative value and
The differential derivative value of the fault phase current instantaneous value correspondence of sampling instant constitutes the relaying protection criterion, whether transmission line single-phase high resistance earthing fault is taken place judge.The inventive method utilizes single end current to realize the single-phase high resistance earthing fault relaying protection 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 current transformer among Fig. 1.The current instantaneous value of each sampling instant of protector measuring transmission line current transformer installation place.
Protective device increases progressively with time in sampling interval Δ t, calculates the corresponding differential derivative value of transmission line malfunction phase current instantaneous value i (t) of each sampling instant t successively
Wherein, t is sampling instant; I (t) is the fault phase current waveform sampled value of t sampling instant; I (t-Δ t) is the fault phase current waveform sampled value of t-Δ t sampling instant; Δ t is the time in sampling interval.
Protective device is judged
Whether set up, if set up, then protective device sends the would trip signal, the circuit breaker at tripping transmission line two ends; Wherein,
For
The fault phase current waveform sampled value of sampling instant;
For
The fault phase current waveform sampled value of sampling instant; T is sampling instant; T is the time in first-harmonic sampling period; Δ t is the time in sampling interval; K is tuning coefficient.
The inventive method is at first measured the current instantaneous value of each sampling instant of transmission line current transformer installation place, the fault phase current waveform instantaneous value of each sampling instant is carried out the differential processing of differentiating, choose then the t sampling instant fault phase current instantaneous value correspondence the differential derivative value and
The differential derivative value of the fault phase current instantaneous value correspondence of sampling instant constitutes the relaying protection criterion, whether transmission line single-phase high resistance earthing fault is taken place judge.The inventive method utilizes single end current to realize the single-phase high resistance earthing fault relaying protection 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 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 relay protecting method of transmission line is characterized in that, comprises following sequential steps:
(1) current instantaneous value of each sampling instant of protector measuring transmission line current transformer installation place, Δ t increases progressively with the time in sampling interval, calculates the corresponding differential derivative value of transmission line malfunction phase current instantaneous value i (t) of each t sampling instant successively
Wherein, t is sampling instant; I (t) is the fault phase current waveform sampled value of t sampling instant; I (t-Δ t) is the fault phase current waveform sampled value of t-Δ t sampling instant; Δ t is the time in sampling interval;
(2) protective device is judged
Whether set up, if set up, then protective device sends the would trip signal, the circuit breaker at tripping transmission line two ends; Wherein,
For
The fault phase current waveform sampled value of sampling instant;
For
The fault phase current waveform sampled value of sampling instant; T is sampling instant; T is the time in first-harmonic sampling period; Δ t is the time in sampling interval; K is tuning coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185057.9A CN103296653B (en) | 2013-05-19 | 2013-05-19 | Transmission line single-phase high-impedance relay protecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185057.9A CN103296653B (en) | 2013-05-19 | 2013-05-19 | Transmission line single-phase high-impedance relay protecting method |
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| CN103296653A true CN103296653A (en) | 2013-09-11 |
| CN103296653B CN103296653B (en) | 2016-02-17 |
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| CN201310185057.9A Active CN103296653B (en) | 2013-05-19 | 2013-05-19 | Transmission line single-phase high-impedance relay protecting method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10322887A (en) * | 1997-05-20 | 1998-12-04 | Tokyo Electric Power Co Inc:The | Grounding distance relay |
| CN1282876A (en) * | 2000-09-15 | 2001-02-07 | 清华大学 | Method and equipment for positioning failure point on electric power transmission line |
| CN1601840A (en) * | 2004-09-29 | 2005-03-30 | 上海交通大学 | Phase selection method of single loop fault based on one-end current temporary state informations |
| CN101047314A (en) * | 2007-04-28 | 2007-10-03 | 华中科技大学 | Equi-transmission instantaneous value differential protection method of microcomputer protection for remote transmission line |
| CN101252274A (en) * | 2008-04-03 | 2008-08-27 | 昆明理工大学 | Same tower double back transmission line fault distance measuring time domain method using single end current flow |
| CN102868150A (en) * | 2012-09-10 | 2013-01-09 | 中国电力科学研究院 | Full-current differential protection braking coefficient adaptive regulating method for transmission line |
-
2013
- 2013-05-19 CN CN201310185057.9A patent/CN103296653B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10322887A (en) * | 1997-05-20 | 1998-12-04 | Tokyo Electric Power Co Inc:The | Grounding distance relay |
| CN1282876A (en) * | 2000-09-15 | 2001-02-07 | 清华大学 | Method and equipment for positioning failure point on electric power transmission line |
| CN1601840A (en) * | 2004-09-29 | 2005-03-30 | 上海交通大学 | Phase selection method of single loop fault based on one-end current temporary state informations |
| CN101047314A (en) * | 2007-04-28 | 2007-10-03 | 华中科技大学 | Equi-transmission instantaneous value differential protection method of microcomputer protection for remote transmission line |
| CN101252274A (en) * | 2008-04-03 | 2008-08-27 | 昆明理工大学 | Same tower double back transmission line fault distance measuring time domain method using single end current flow |
| CN102868150A (en) * | 2012-09-10 | 2013-01-09 | 中国电力科学研究院 | Full-current differential protection braking coefficient adaptive regulating method for transmission line |
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