CN103296645A - Line inter-phase fault distance protection method implemented by aid of distributed parameters - Google Patents
Line inter-phase fault distance protection method implemented by aid of distributed parameters Download PDFInfo
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- CN103296645A CN103296645A CN2013101848297A CN201310184829A CN103296645A CN 103296645 A CN103296645 A CN 103296645A CN 2013101848297 A CN2013101848297 A CN 2013101848297A CN 201310184829 A CN201310184829 A CN 201310184829A CN 103296645 A CN103296645 A CN 103296645A
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Abstract
The invention discloses a line inter-phase fault distance protection method implemented by the aid of distributed parameters. The line inter-phase fault distance protection method includes computing line impedance from a power transmission line protection setting range position to an inter-phase short-circuit fault point by the aid of a distributed parameter model and fault inter-phase voltages, fault inter-phase currents and fault inter-phase negative-sequence currents at a power transmission line protection mounting position; judging whether a line impedance phase angle between the power transmission line protection setting range position to the inter-phase short-circuit fault point is within the range between 60 degrees and 120 degrees or not; determining that the inter-phase short-circuit fault point is positioned within the power transmission line protection setting range if the line impedance phase angle is within the range between 60 degrees and 120 degrees, and enabling a protection device to transmit an action trip signal. The line inter-phase fault distance protection method has the advantages that a physical model used in the method is the distributed parameter model, and the distributed parameter model has natural ability of resisting influence of distributed capacitance currents and is suitable for ultrahigh/extra-high-voltage power transmission line inter-phase short-circuit fault relay protection methods; influence of transition resistance on the protection action performance is eliminated by the method in principle, and the ability of resisting the influence of the transition resistance is excellent.
Description
Technical field
The present invention relates to the relay protection of power system technical field, specifically relate to a kind of distributed constant that utilizes and realize circuit phase-to phase fault distance protecting method.
Background technology
The impedance distance protection is positioned at the protection zone according to measurement impedance magnitude reflection fault distance length with the differentiation fault point or is positioned at outside the protection zone.The impedance distance protection is little owing to influenced by power system operation mode and structural change, and being used for calculating the electric parameters of measuring impedance is the total failure component, is applicable to whole failure process.Therefore, the impedance distance protection both can be used for the ultra-high-tension power transmission line main protection, also can be used as the backup protection of ultra-high/extra-high voltage transmission line.If yet impedance distance protection performance is influenced seriously by transition resistance, mainly shows as the additional impedance that transition resistance produces is resistance sense impedance distance protection tripping when causing the line protection troubles inside the sample space easily; 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.
The voltage of ultra-high/extra-high voltage transmission line, current delivery have tangible wave process, and transmission line capacitance current along the line is very big, can not ignore the influence of impedance distance protection performance.Consider the influence of transmission line capacitance current along the line, fault impedance and fault distance are the hyperbolic tangent function relation, the hyperbolic tangent function magnitude-phase characteristics has determined the anti-transition resistance ability of impedance relay, and the additional impedance that transition resistance brings will have a strong impact on the performance of impedance relay.The ultra-high/extra-high voltage transmission line is carried big capacity electric energy, is the heavy load transmission line, and the heavy load electric current can make the action sensitivity of impedance distance protection reduce, and the heavy load electric current can not be ignored the influence of impedance distance protection performance.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, the distributed constant that utilizes that provides a kind of performance not influenced by capacitance current, transition resistance and load current is realized circuit phase-to phase fault distance protecting method.
Utilize distributed constant to realize circuit phase-to phase fault distance protecting method, it is characterized in that, comprise following sequential steps:
(1) the fault voltage between phases of protector measuring line protection installation place
, the fault three-phase current
Alternate negative-sequence current with fault
Wherein, Φ Φ=AB, BC, CA phase;
(2) protective device computing electric power line protection setting range place arrives the line impedance Δ z of phase fault point:
Wherein, l
SetBe the line protection setting range; Z
C1Be transmission line positive sequence wave impedance; β=Arg (Z
C1Th (γ
1l
Set));
Th (.) is hyperbolic tangent function; γ
1Be transmission line positive sequence propagation coefficient;
(3) whether protective device is judged that line protection setting range place drops in (60 ° 120 °) scope to the phase angle Arg (Δ z) of the line impedance Δ z of phase fault point and is set up; if set up; judge that then the phase fault point is positioned within the line protection setting range; protective device sends the would trip signal, the circuit breaker at tripping transmission line two ends.
The present invention has following positive achievement compared with prior art:
The inventive method physical model adopts distributed parameter model, has the ability of natural anti-capacitance current influence, is applicable to the relay protecting method of ultra-high/extra-high voltage transmission line phase fault.Eliminate the influence of transition resistance to the protection performance on the inventive method principle, had the ability of very strong anti-transition resistance influence.Eliminated the influence of load current to the protection performance on the inventive method principle; the inventive method performance is reliable and stable during transmission line heavy service; misoperation can not take place; power network safety operation is guaranteed in the generation of power grid cascading tripping operation accident in the time of preventing effectively that electric network swim is big and shift.
Description of drawings
Fig. 1 is for using circuit transmission system schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention is done further detailed presentations.
Fig. 1 is for using circuit transmission system schematic diagram of the present invention.CVT is that voltage transformer, CT are current transformer among Fig. 1.Protective device is sampled to the current waveform of the voltage and current instrument transformer CT of the voltage transformer CVT of line protection installation place and is obtained voltage, current instantaneous value, and protective device utilizes the fault voltage between phases of Fourier algorithm computing electric power line protection installation place to its voltage that collects, current instantaneous value then
, the fault three-phase current
Alternate negative-sequence current with fault
Wherein, Φ Φ=AB, BC, CA phase.
Protective device computing electric power line protection setting range place arrives the line impedance Δ z of phase fault point:
Wherein, l
SetBe the line protection setting range; Z
C1Be transmission line positive sequence wave impedance; β=Arg (Z
C1Th (γ
1l
Set));
Th (.) is hyperbolic tangent function; γ
1Be transmission line positive sequence propagation coefficient;
Whether protective device is judged that line protection setting range place drops in (60 ° 120 °) scope to the phase angle Arg (Δ z) of the line impedance Δ z of phase fault point and is set up; if set up; judge that then the phase fault point is positioned within the line protection setting range; protective device sends the would trip signal, the circuit breaker at tripping transmission line two ends.
The inventive method physical model adopts distributed parameter model, has the ability of natural anti-capacitance current influence, is applicable to the relay protecting method of ultra-high/extra-high voltage transmission line phase fault.Eliminate the influence of transition resistance to the protection performance on the inventive method principle, had the ability of very strong anti-transition resistance influence.Eliminated the influence of load current to the protection performance on the inventive method principle; the inventive method performance is reliable and stable during transmission line heavy service; misoperation can not take place; power network safety operation is guaranteed in the generation of power grid cascading tripping operation accident in the time of preventing effectively that electric network swim is big and shift.
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. utilize distributed constant to realize circuit phase-to phase fault distance protecting method, it is characterized in that, comprise following sequential steps:
(1) the fault voltage between phases of protector measuring line protection installation place
, the fault three-phase current
Alternate negative-sequence current with fault
Wherein, Φ Φ=AB, BC, CA phase;
(2) protective device computing electric power line protection setting range place arrives the line impedance Δ z of phase fault point:
Wherein, l
SetBe the line protection setting range; Z
C1Be transmission line positive sequence wave impedance; β=Arg (Z
C1Th (γ
1l
Set));
Th (.) is hyperbolic tangent function; γ
1Be transmission line positive sequence propagation coefficient;
(3) whether protective device is judged that line protection setting range place drops in (60 ° 120 °) scope to the phase angle Arg (Δ z) of the line impedance Δ z of phase fault point and is set up; if set up; judge that then the phase fault point is positioned within the line protection setting range; protective device sends the would trip signal, the circuit breaker at tripping transmission line two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310184829.7A CN103296645B (en) | 2013-05-19 | 2013-05-19 | Distributed constant is utilized to realize line inter-phase fault distance protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310184829.7A CN103296645B (en) | 2013-05-19 | 2013-05-19 | Distributed constant is utilized to realize line inter-phase fault distance protection method |
Publications (2)
| Publication Number | Publication Date |
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| CN103296645A true CN103296645A (en) | 2013-09-11 |
| CN103296645B CN103296645B (en) | 2016-08-03 |
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| CN201310184829.7A Active CN103296645B (en) | 2013-05-19 | 2013-05-19 | Distributed constant is utilized to realize line inter-phase fault distance protection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316842A (en) * | 2014-11-14 | 2015-01-28 | 国家电网公司 | Line phase fault single-ended distance measurement method by means of phase fault position factor phase characteristic |
| CN113064022A (en) * | 2021-03-12 | 2021-07-02 | 国网河南省电力公司电力科学研究院 | Line protection method based on transition resistance calculation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6459960B1 (en) * | 1998-10-14 | 2002-10-01 | Kabushiki Kaisha Toshiba | Distance relay equipment |
| CN101173975A (en) * | 2007-11-29 | 2008-05-07 | 北京四方继保自动化股份有限公司 | Method for implementing distance measurement between two ends of electric transmission line using interphase electrical quantities |
| CN102354962A (en) * | 2011-09-01 | 2012-02-15 | 西安交通大学 | Distance protection method making use of voltage distribution under distributed parameter model |
-
2013
- 2013-05-19 CN CN201310184829.7A patent/CN103296645B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6459960B1 (en) * | 1998-10-14 | 2002-10-01 | Kabushiki Kaisha Toshiba | Distance relay equipment |
| CN101173975A (en) * | 2007-11-29 | 2008-05-07 | 北京四方继保自动化股份有限公司 | Method for implementing distance measurement between two ends of electric transmission line using interphase electrical quantities |
| CN102354962A (en) * | 2011-09-01 | 2012-02-15 | 西安交通大学 | Distance protection method making use of voltage distribution under distributed parameter model |
Non-Patent Citations (2)
| Title |
|---|
| 索南加乐等: "基于分布参数模型的高压直流输电线路距离保护", 《电力***自动化》 * |
| 马静等: "一种基于分布参数模型的线路相间距离保护方法", 《电力***保护与控制》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316842A (en) * | 2014-11-14 | 2015-01-28 | 国家电网公司 | Line phase fault single-ended distance measurement method by means of phase fault position factor phase characteristic |
| CN104316842B (en) * | 2014-11-14 | 2017-04-26 | 国家电网公司 | Line phase fault single-ended distance measurement method by means of phase fault position factor phase characteristic |
| CN113064022A (en) * | 2021-03-12 | 2021-07-02 | 国网河南省电力公司电力科学研究院 | Line protection method based on transition resistance calculation |
| CN113064022B (en) * | 2021-03-12 | 2022-04-29 | 国网河南省电力公司电力科学研究院 | Line protection method based on transition resistance calculation |
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| CN103296645B (en) | 2016-08-03 |
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