CN105699853A - Power transmission line grounding fault phase selection method - Google Patents
Power transmission line grounding fault phase selection method Download PDFInfo
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- CN105699853A CN105699853A CN201610186689.0A CN201610186689A CN105699853A CN 105699853 A CN105699853 A CN 105699853A CN 201610186689 A CN201610186689 A CN 201610186689A CN 105699853 A CN105699853 A CN 105699853A
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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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- Locating Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a power transmission line grounding fault phase selection method. According to the method of the invention, a distributed parameter model is used as a physical model; phase relationship between a zero-sequence voltage difference and one end A-phase negative-sequence current of a power transmission line and phase relationship between the zero-sequence voltage difference and one end A-phase positive-sequence current of the power transmission line are used for forming a power transmission line grounding fault phase selection criteria, thereby accurately determining the type of power transmission line grounding shortcircuit fault. According to the method of the invention, the distributed parameter model is used as the physical model. The method has natural capability of resisting influence of distributed capacitive current and is suitable for superhigh-voltage and ultrahigh-voltage power transmission lines. When high-resistance grounding shortcircuit fault of the power transmission line occurs on condition that relatively large change of a weak power supply side and system operation mode is generated, the method of the invention has advantages of realizing high-enough phase selection sensitivity, accurately determining a particular grounding fault phase and supplying accurate and reliable fault phase information for distance protection and accurate 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 transmission lines earth fault phase-selecting method。
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, the transmission lines earth fault phase-selecting method of single-phase grounding fault and two-phase short circuit and ground fault can be accurately distinguished。
For completing above-mentioned purpose, the present invention adopts the following technical scheme that
Transmission lines earth fault phase-selecting method, 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 currentWith A phase forward-order current Sudden Changing RateMeasure the residual voltage of transmission line of electricity n end protection installation place
(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 transmission line of electricity one end A phase forward-order current poor with the phase relation of transmission line of electricity one end A phase negative-sequence current 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; 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 currentWith A phase forward-order current Sudden Changing RateMeasure the residual voltage of transmission line of electricity n end protection installation place
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 transmission line of electricity one end A phase forward-order current poor with the phase relation of transmission line of electricity one end A phase negative-sequence current 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; 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. transmission lines earth fault phase-selecting method, 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 currentWith A phase forward-order current Sudden Changing RateMeasure the residual voltage of transmission line of electricity n end protection installation place
(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 |
|---|---|---|---|
| CN201610186689.0A CN105699853B (en) | 2016-03-29 | 2016-03-29 | Transmission lines earth fault phase-selecting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610186689.0A CN105699853B (en) | 2016-03-29 | 2016-03-29 | Transmission lines earth fault phase-selecting method |
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| CN105699853A true CN105699853A (en) | 2016-06-22 |
| CN105699853B CN105699853B (en) | 2019-01-25 |
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| CN201610186689.0A Active CN105699853B (en) | 2016-03-29 | 2016-03-29 | Transmission lines earth fault phase-selecting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109239531A (en) * | 2018-10-17 | 2019-01-18 | 国电南瑞科技股份有限公司 | Failure wave-recording on-line analysis based on relay protection in-service monitoring and analysis system |
| CN112152191A (en) * | 2020-09-01 | 2020-12-29 | 国网陕西省电力公司榆林供电公司 | Fault processing method, device and storage medium for distribution line |
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| JP2004201356A (en) * | 2002-12-13 | 2004-07-15 | Toenec Corp | Earth fault directional relay |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239531A (en) * | 2018-10-17 | 2019-01-18 | 国电南瑞科技股份有限公司 | Failure wave-recording on-line analysis based on relay protection in-service monitoring and analysis system |
| CN112152191A (en) * | 2020-09-01 | 2020-12-29 | 国网陕西省电力公司榆林供电公司 | Fault processing method, device and storage medium for distribution line |
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| CN105699853B (en) | 2019-01-25 |
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