CN105699851A - Line grounding fault phase selection method by means of sequence current phase characteristic - Google Patents
Line grounding fault phase selection method by means of sequence current phase characteristic Download PDFInfo
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- CN105699851A CN105699851A CN201610185976.XA CN201610185976A CN105699851A CN 105699851 A CN105699851 A CN 105699851A CN 201610185976 A CN201610185976 A CN 201610185976A CN 105699851 A CN105699851 A CN 105699851A
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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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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a line grounding fault phase selection method by means of a sequence current phase characteristic. According to the method of the invention, a zero-sequence current, an A-phase negative-sequence current and an A-phase positive-sequence current jump value are firstly measured. Then phase relationship between a zero-sequence current and an A-phase negative-sequence current and phase relationship between the zero-sequence current and the A-phase positive-sequence current jump value are utilized for forming a fault phase selection criteria, thereby accurately determining the type of a power transmission line grounding shortcircuit fault. When high-resistance grounding shortcircuit fault of a power transmission line occurs on condition that relatively large change of a weak power side and system operation mode occurs, 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 one and utilize sequence current phase characteristic to realize line-to-ground 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, single-phase grounding fault can be accurately distinguished and the sequence current phase characteristic that utilizes of two-phase short circuit and ground fault realizes line-to-ground fault phase-selecting method。
For completing above-mentioned purpose, the present invention adopts the following technical scheme that
Utilizing sequence current phase characteristic to realize line-to-ground fault phase-selecting method, it is characterized by, and comprises the following steps that
(1) zero-sequence current of protector measuring line protection installation placeA phase negative-sequence currentWith A phase forward-order current Sudden Changing Rate
(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；
(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 utilizes the phase relation between the phase relation between zero-sequence current with A phase negative-sequence current and zero-sequence current and A phase forward-order current Sudden Changing Rate to constitute 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。The current waveform of the Current Transmit of line protection installation place is carried out sampling and obtains current instantaneous value by protection device, and then its current instantaneous value collected is utilized the zero-sequence current of Fourier algorithm computing electric power line protection installation place by protection deviceA phase negative-sequence currentWith A phase forward-order current Sudden Changing Rate
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。
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 utilizes the phase relation between the phase relation between zero-sequence current with A phase negative-sequence current and zero-sequence current and A phase forward-order current Sudden Changing Rate to constitute 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. utilize sequence current phase characteristic to realize line-to-ground fault phase-selecting method, it is characterised in that to comprise the steps:
(1) zero-sequence current of protector measuring line protection installation placeA phase negative-sequence currentWith A phase forward-order current Sudden Changing Rate
(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；
(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 |
|---|---|---|---|
| CN201610185976.XA CN105699851B (en) | 2016-03-29 | 2016-03-29 | Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610185976.XA CN105699851B (en) | 2016-03-29 | 2016-03-29 | Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic |
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| Publication Number | Publication Date |
|---|---|
| CN105699851A true CN105699851A (en) | 2016-06-22 |
| CN105699851B CN105699851B (en) | 2018-11-06 |
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| CN201610185976.XA Active CN105699851B (en) | 2016-03-29 | 2016-03-29 | Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| JP2004201356A (en) * | 2002-12-13 | 2004-07-15 | Toenec Corp | Earth fault directional relay |
| CN102769279A (en) * | 2012-07-23 | 2012-11-07 | 国电南瑞科技股份有限公司 | High-resistance grounding phase selection method for longitudinal zero-sequence protection of line protection device |
| CN103227455A (en) * | 2013-04-15 | 2013-07-31 | 国家电网公司 | Single-phase line earth fault relay protection method based on fault impedance phase characteristic |
| CN103746352A (en) * | 2013-12-26 | 2014-04-23 | 北京四方继保自动化股份有限公司 | Line protection phase selection method not influenced by operation mode |
| CN104267311A (en) * | 2014-09-12 | 2015-01-07 | 广东电网公司电力科学研究院 | Phase selection method for faults of double-circuit lines on same tower |
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2016
- 2016-03-29 CN CN201610185976.XA patent/CN105699851B/en active Active
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| JP2004201356A (en) * | 2002-12-13 | 2004-07-15 | Toenec Corp | Earth fault directional relay |
| CN102769279A (en) * | 2012-07-23 | 2012-11-07 | 国电南瑞科技股份有限公司 | High-resistance grounding phase selection method for longitudinal zero-sequence protection of line protection device |
| CN103227455A (en) * | 2013-04-15 | 2013-07-31 | 国家电网公司 | Single-phase line earth fault relay protection method based on fault impedance phase characteristic |
| CN103746352A (en) * | 2013-12-26 | 2014-04-23 | 北京四方继保自动化股份有限公司 | Line protection phase selection method not influenced by operation mode |
| CN104267311A (en) * | 2014-09-12 | 2015-01-07 | 广东电网公司电力科学研究院 | Phase selection method for faults of double-circuit lines on same tower |
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| 刘欣 等: "相电流差突变量选相在混压同塔输电线跨电压故障中的适应性分析", 《电工技术学报》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN105699851B (en) | 2018-11-06 |
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