CN105699852A - Power transmission line grounding fault phase selection method capable of resisting distributed capacitive current and transition resistance effect - Google Patents
Power transmission line grounding fault phase selection method capable of resisting distributed capacitive current and transition resistance effect Download PDFInfo
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- CN105699852A CN105699852A CN201610186342.6A CN201610186342A CN105699852A CN 105699852 A CN105699852 A CN 105699852A CN 201610186342 A CN201610186342 A CN 201610186342A CN 105699852 A CN105699852 A CN 105699852A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a power transmission line grounding fault selection method capable of resisting distributed capacitive current and transition resistance effect. According to the power transmission line grounding fault selection method, a distributed parameter model is used as a physical model; phase relationship between a zero-sequence voltage difference and an A-phase negative-sequence current vector sum and phase relationship between the zero-sequence voltage difference and the A-phase positive-sequence current vector sum are utilized for forming a power transmission line grounding fault phase selection criteria, thereby accurately determining the type of a power transmission line grounding shortcircuit fault. According to the method of the invention, a distributed parameter model is used as the physical model; the method of the invention has natural capability for resisting the distributed capacitive current effect, and is suitable for superhigh-voltage and ultrahigh-voltage power transmission line. When high-resistance grounding shortcircuit fault occurs on condition that relatively large change of a weak power supply side and a system operation mode occurs. According to the method of the invention, a high-enough phase selection sensitivity is realized in the whole fault process of power transmission line grounding fault. A particular grounding fault phase can be accurately determined. Accurate and reliable fault phase information can be supplied for distance protection and correct action of an autoreclose circuit breaker.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, concretely relate to a kind of anti-capacitance current and the transmission lines earth fault phase-selecting method of transition resistance impact。
Background technology
Power transmission line fault phase selection mainly includes difference of phase currents phase selection, phase voltage Sudden Changing Rate phase selection and the comprehensive phase-selecting method of voltage x current Sudden Changing Rate。At light current source, difference of phase currents phase selection insufficient sensitivity is high；At forceful electric power source, phase voltage Sudden Changing Rate phase selection sensitivity Shortcomings；Although the comprehensive phase-selecting method of voltage x current Sudden Changing Rate all has better phase selection sensitivity at light current source and forceful electric power source, but in three phase short circuit fault phase selection and high resistance ground short trouble sensitivity Shortcomings。
Transmission line malfunction phase selection correctness is related to that the correct operation of transmission line distance protecting and auto recloser is whether; reinforcement relay protection of transmission line action correctness and reliability had particularly significant impact; therefore, study a kind of under light current source and system operation mode generation large change situation, all there is sufficiently high phase selection sensitivity, the transmission lines earth fault phase-selecting method tool that can accurately distinguish single-phase grounding fault and two-phase short circuit and ground fault is of great significance。
Summary of the invention
It is an object of the invention to the deficiency overcoming prior art to exist, it is provided that a kind of under light current source and system operation mode generation large change situation, all there is sufficiently high phase selection sensitivity, single-phase grounding fault can be accurately distinguished and the transmission lines earth fault phase-selecting method of the anti-capacitance current of two-phase short circuit and ground fault and transition resistance impact。
For completing above-mentioned purpose, the present invention adopts the following technical scheme that
The transmission lines earth fault phase-selecting method of anti-capacitance current and transition resistance impact, it is characterized by, including following sequential steps:
(1) zero-sequence current of protector measuring transmission line of electricity m end protection installation placeResidual voltageA phase negative-sequence currentA phase forward-order currentA phase negative sequence voltageWith A phase positive sequence voltageMeasure the residual voltage of transmission line of electricity n end protection installation placeA phase negative-sequence currentA phase forward-order current
(2) protection device judgesAndWhether set up, if setting up, then protection device is judged as A phase transmission line of electricity single phase ground fault fault；Wherein, γ0For power transmission line zero-sequence propagation constant；γ1For electric transmission line positive sequence propagation constant；Zc0For power transmission line zero-sequence natural impedance；Zc1For electric transmission line positive sequence natural impedance；LmnFor transmission line length；Cosh (.) is hyperbolic cosine function；Sinh (.) is hyperbolic sine function；
(3) protection device judgesAndWhether set up, if setting up, then protection device is judged as BC phase transmission line of electricity generation ground short circuit fault；
(4) protection device judgesAndWhether set up, if setting up, then protection device is judged as B phase transmission line of electricity single phase ground fault fault；
(5) protection device judgesAndWhether set up, if setting up, then protection device is judged as CA phase transmission line of electricity generation ground short circuit fault；
(6) protection device judgesAndWhether set up, if setting up, then protection device is judged as C phase transmission line of electricity single phase ground fault fault；
(7) protection device judgesAndWhether set up, if setting up, then protection device is judged as AB phase transmission line of electricity generation ground short circuit fault。
The present invention compared with prior art, has following positive achievement:
The inventive method physical model adopts distributed parameter model, has the ability of natural anti-capacitance current impact, it is adaptable to supertension, UHV transmission line。The inventive method utilizes residual voltage difference phase relation with A phase forward-order current vector poor with the phase relation of A phase negative-sequence current vector and residual voltage to constitute transmission lines earth fault phase selection criterion, accurately judges transmission line of electricity ground short circuit fault type。Under light current source and system operation mode generation large change situation during transmission line of electricity generation high resistance ground short trouble; the inventive method all has sufficiently high phase selection sensitivity in the whole failure process of transmission lines earth fault; concrete earth fault phase can be accurately judged to, correct fault phase information reliably can be provided for distance protection and automatic reclosing correct operation。
Accompanying drawing explanation
Fig. 1 is the multi-line power transmission system schematic of the application present invention。
Detailed description of the invention
Below according to Figure of description, technical scheme is expressed in further detail。
Fig. 1 is the multi-line power transmission system schematic of the application present invention。In Fig. 1, CT is current transformer, CVT is voltage transformer。The zero-sequence current of protector measuring transmission line of electricity m end protection installation placeResidual voltageA phase negative-sequence currentA phase forward-order currentA phase negative sequence voltageWith A phase positive sequence voltageMeasure the residual voltage of transmission line of electricity n end protection installation placeA phase negative-sequence currentA phase forward-order current
Protection device judgesAndWhether set up, if setting up, then protection device is judged as A phase transmission line of electricity single phase ground fault fault；Wherein, γ0For power transmission line zero-sequence propagation constant；γ1For electric transmission line positive sequence propagation constant；Zc0For power transmission line zero-sequence natural impedance；Zc1For electric transmission line positive sequence natural impedance；LmnFor transmission line length；Cosh (.) is hyperbolic cosine function；Sinh (.) is hyperbolic sine function。
Protection device judgesAndWhether set up, if setting up, then protection device is judged as BC phase transmission line of electricity generation ground short circuit fault；
Protection device judgesAndWhether set up, if setting up, then protection device is judged as B phase transmission line of electricity single phase ground fault fault；
Protection device judgesAndWhether set up, if setting up, then protection device is judged as CA phase transmission line of electricity generation ground short circuit fault；
Protection device judgesAndWhether set up, if setting up, then protection device is judged as C phase transmission line of electricity single phase ground fault fault；
Protection device judgesAndWhether set up, if setting up, then protection device is judged as AB phase transmission line of electricity generation ground short circuit fault。
The inventive method physical model adopts distributed parameter model, has the ability of natural anti-capacitance current impact, it is adaptable to supertension, UHV transmission line。The inventive method utilizes residual voltage difference phase relation with A phase forward-order current vector poor with the phase relation of A phase negative-sequence current vector and residual voltage to constitute transmission lines earth fault phase selection criterion, accurately judges transmission line of electricity ground short circuit fault type。
Under light current source and system operation mode generation large change situation during transmission line of electricity generation high resistance ground short trouble; the inventive method all has sufficiently high phase selection sensitivity in the whole failure process of transmission lines earth fault; concrete earth fault phase can be accurately judged to, correct fault phase information reliably can be provided for distance protection and automatic reclosing correct operation。
The foregoing is only the preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention。
Claims (1)
1. the transmission lines earth fault phase-selecting method of anti-capacitance current and transition resistance impact, it is characterised in that include following sequential steps:
(1) zero-sequence current of protector measuring transmission line of electricity m end protection installation placeResidual voltageA phase negative-sequence currentA phase forward-order currentA phase negative sequence voltageWith A phase positive sequence voltageMeasure the residual voltage of transmission line of electricity n end protection installation placeA phase negative-sequence currentA phase forward-order current
(2) protection device judgesAndWhether set up, if setting up, then protection device is judged as A phase transmission line of electricity single phase ground fault fault；Wherein, γ0For power transmission line zero-sequence propagation constant；γ1For electric transmission line positive sequence propagation constant；Zc0For power transmission line zero-sequence natural impedance；Zc1For electric transmission line positive sequence natural impedance；LmnFor transmission line length；Cosh (.) is hyperbolic cosine function；Sinh (.) is hyperbolic sine function；
(3) protection device judgesAndWhether set up, if setting up, then protection device is judged as BC phase transmission line of electricity generation ground short circuit fault；
(4) protection device judgesAndWhether set up, if setting up, then protection device is judged as B phase transmission line of electricity single phase ground fault fault；
(5) protection device judgesAndWhether set up, if setting up, then protection device is judged as CA phase transmission line of electricity generation ground short circuit fault；
(6) protection device judgesAndWhether set up, if setting up, then protection device is judged as C phase transmission line of electricity single phase ground fault fault；
(7) protection device judgesAndWhether set up, if setting up, then protection device is judged as AB phase transmission line of electricity generation ground short circuit fault。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610186342.6A CN105699852B (en) | 2016-03-29 | 2016-03-29 | The transmission lines earth fault phase-selecting method that capable of preventing distributed capacitive current and transitional resistance influences |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610186342.6A CN105699852B (en) | 2016-03-29 | 2016-03-29 | The transmission lines earth fault phase-selecting method that capable of preventing distributed capacitive current and transitional resistance influences |
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| CN105699852A true CN105699852A (en) | 2016-06-22 |
| CN105699852B CN105699852B (en) | 2018-10-19 |
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| CN201610186342.6A Expired - Fee Related CN105699852B (en) | 2016-03-29 | 2016-03-29 | The transmission lines earth fault phase-selecting method that capable of preventing distributed capacitive current and transitional resistance influences |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261720A (en) * | 2019-08-06 | 2019-09-20 | 云南电网有限责任公司电力科学研究院 | The single-phase earthing method of discrimination and device of distribution net work earthing fault |
| CN112698147A (en) * | 2020-12-03 | 2021-04-23 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN117406020A (en) * | 2023-10-19 | 2024-01-16 | 国网湖北省电力有限公司荆门供电公司 | Fault phase selection method for constructing generalized power ratio based on compensation abrupt quantity |
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| CN110261720A (en) * | 2019-08-06 | 2019-09-20 | 云南电网有限责任公司电力科学研究院 | The single-phase earthing method of discrimination and device of distribution net work earthing fault |
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| CN112698147A (en) * | 2020-12-03 | 2021-04-23 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN112698147B (en) * | 2020-12-03 | 2024-02-06 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN117406020A (en) * | 2023-10-19 | 2024-01-16 | 国网湖北省电力有限公司荆门供电公司 | Fault phase selection method for constructing generalized power ratio based on compensation abrupt quantity |
| CN117406020B (en) * | 2023-10-19 | 2024-04-30 | 国网湖北省电力有限公司荆门供电公司 | Fault phase selection method for constructing generalized power ratio based on compensation abrupt quantity |
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