CN105699851B - Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic - Google Patents
Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic Download PDFInfo
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- CN105699851B CN105699851B CN201610185976.XA CN201610185976A CN105699851B CN 105699851 B CN105699851 B CN 105699851B CN 201610185976 A CN201610185976 A CN 201610185976A CN 105699851 B CN105699851 B CN 105699851B
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- sequence current
- ground fault
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 230000005611 electricity Effects 0.000 claims abstract description 25
- 238000009434 installation Methods 0.000 claims abstract description 5
- 230000001681 protective effect Effects 0.000 claims description 38
- 241001131927 Placea Species 0.000 claims description 2
- 230000001012 protector Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 230000007812 deficiency Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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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
Abstract
The invention discloses a kind of line-to-ground fault phase-selecting method is realized using sequence current phase characteristic.The method of the present invention measures the zero-sequence current, A phases negative-sequence current and A phase forward-order current Sudden Changing Rates of line protection installation place first; then the phase relation between the phase relation between zero-sequence current and A phase negative-sequence currents and zero-sequence current and A phase forward-order current Sudden Changing Rates is utilized to constitute Fault Phase Selection criterion, accurate judgement transmission line of electricity ground short circuit fault type.When light current source and system operation mode vary widely transmission line of electricity generation high resistance ground short trouble; the method of the present invention all has sufficiently high phase selection sensitivity; it can be accurately judged to specific earth fault phase, can correctly act and correct reliable fault phase information is provided for distance protection and automatic reclosing.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of special using sequence current phase
Property realize line-to-ground fault phase-selecting method.
Background technology
Power transmission line fault phase selection includes mainly difference of phase currents phase selection, phase voltage Sudden Changing Rate phase selection and voltage electricity
It flows Sudden Changing Rate and integrates phase-selecting method.In light current source, difference of phase currents phase selection sensitivity is not high enough；It is mutually electric in forceful electric power source
Press Sudden Changing Rate phase selection sensitivity Shortcomings；Although voltage and current Sudden Changing Rate integrates phase-selecting method in light current source and forceful electric power source
All there is preferable phase selection sensitivity, but sensitivity exists not in terms of three phase short circuit fault phase selection and high resistance ground short trouble
Foot.
Transmission line malfunction phase selection correctness is related to the correct of transmission line distance protecting and auto recloser
Whether action, there is particularly significant influence on reinforcing relay protection of transmission line action correctness and reliability, therefore, research one
Kind varies widely all in light current source and system operation mode to be had sufficiently high phase selection sensitivity, can accurately distinguish
The transmission lines earth fault phase-selecting method of single-phase grounding fault and two-phase short circuit and ground fault has highly important meaning
Justice.
Invention content
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind in light current source and system operation side
Formula all has sufficiently high phase selection sensitivity, can accurately distinguish single-phase grounding fault and two and connect in the case of varying widely
The utilization sequence current phase characteristic of ground short circuit failure realizes line-to-ground fault phase-selecting method.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic, is characterized by, including have the following steps：
(1) zero-sequence current of protector measuring line protection installation placeA phase negative-sequence currentsWith A phase positive sequences
Jump-value of current
(2) protective device judgesAndIt is whether true, if
It sets up, then protective device is judged as A phase transmission line of electricity single phase ground fault failures；
(3) protective device judgesAndIt is whether true, if
It sets up, then protective device is judged as that ground short circuit failure occurs for BC phase transmission lines of electricity；
(4) protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as B phase transmission line of electricity single phase ground fault failures；
(5) protective device judgesAndIt is whether true, if
It sets up, then protective device is judged as that ground short circuit failure occurs for CA phase transmission lines of electricity；
(6) protective device judgesAndIt is whether true, if
It sets up, then protective device is judged as C phase transmission line of electricity single phase ground fault failures；
(7) protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as that ground short circuit failure occurs for AB phase transmission lines of electricity.
The present invention compared with prior art, has following positive achievement：
The method of the present invention utilizes the phase relation and zero-sequence current and A phase positive sequences between zero-sequence current and A phase negative-sequence currents
Phase relation between jump-value of current constitutes Fault Phase Selection criterion, accurate judgement transmission line of electricity ground short circuit fault type.?
When high resistance ground short trouble occurs for transmission line of electricity in the case of light current source and system operation mode vary widely, the present invention
Method all has sufficiently high phase selection sensitivity, can be accurately judged to specific earth fault phase, can be distance protection and automatic
Reclosing correctly acts the correct reliable fault phase information of offer.
Description of the drawings
Fig. 1 is the multi-line power transmission system schematic using the present invention.
Specific implementation mode
Technical scheme of the present invention is expressed in further detail below according to Figure of description.
Fig. 1 is the multi-line power transmission system schematic using the present invention.CT is current transformer in Fig. 1.Protective device is to defeated
The current waveform of the Current Transmit of electric line protection installation place is sampled to obtain current instantaneous value, then protective device pair
Its collected current instantaneous value protects the zero-sequence current of installation place using Fourier algorithm computing electric power lineA phase negative phase-sequences
Electric currentWith A phase forward-order current Sudden Changing Rates
Protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as A phase transmission line of electricity single phase ground fault failures.
Protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as that ground short circuit failure occurs for BC phase transmission lines of electricity.
Protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as B phase transmission line of electricity single phase ground fault failures.
Protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as that ground short circuit failure occurs for CA phase transmission lines of electricity.
Protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as C phase transmission line of electricity single phase ground fault failures.
Protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as that ground short circuit failure occurs for AB phase transmission lines of electricity.
The method of the present invention utilizes the phase relation and zero-sequence current and A phase positive sequences between zero-sequence current and A phase negative-sequence currents
Phase relation between jump-value of current constitutes Fault Phase Selection criterion, accurate judgement transmission line of electricity ground short circuit fault type.?
When high resistance ground short trouble occurs for transmission line of electricity in the case of light current source and system operation mode vary widely, the present invention
Method all has sufficiently high phase selection sensitivity, can be accurately judged to specific earth fault phase, can be distance protection and automatic
Reclosing correctly acts the correct reliable fault phase information of offer.
The foregoing is merely the preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, appoint
What those familiar with the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in, all
It is covered by the protection scope of the present invention.
Claims (1)
1. realizing line-to-ground fault phase-selecting method using sequence current phase characteristic, which is characterized in that include the following steps：
(1) zero-sequence current of protector measuring line protection installation placeA phase negative-sequence currentsWith A phase forward-order currents
Sudden Changing Rate
(2) protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as A phase transmission line of electricity single phase ground fault failures；
(3) protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as that two-phase short circuit and ground fault occurs for BC phase transmission lines of electricity；
(4) protective device judgesAndIt is whether true, if so,
Then protective device is judged as B phase transmission line of electricity single phase ground fault failures；
(5) protective device judgesAndIt is whether true, if so,
Then protective device is judged as that two-phase short circuit and ground fault occurs for CA phase transmission lines of electricity；
(6) protective device judgesAndIt is whether true, if at
Vertical, then protective device is judged as C phase transmission line of electricity single phase ground fault failures；
(7) protective device judgesAndIt is whether true, if so,
Then protective device is judged as that two-phase short circuit and ground fault occurs for AB phase transmission lines of electricity.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105699851A CN105699851A (en) | 2016-06-22 |
| CN105699851B true CN105699851B (en) | 2018-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004201356A (en) * | 2002-12-13 | 2004-07-15 | Toenec Corp | Earth fault directional relay |
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2016
- 2016-03-29 CN CN201610185976.XA patent/CN105699851B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| 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;刘欣 等;《电工技术学报》;20151130;第30卷(第21期);第118-126页 * |
| 风电场对继电保护选相元件的影响与改进;彭东虎 等;《可再生能源》;20140430;第32卷(第4期);第418-423页 * |
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| CN105699851A (en) | 2016-06-22 |
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