CN105699850B - Line-to-ground fault phase-selecting method is realized using current in the fault point phase characteristic - Google Patents
Line-to-ground fault phase-selecting method is realized using current in the fault point phase characteristic Download PDFInfo
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- CN105699850B CN105699850B CN201610185952.4A CN201610185952A CN105699850B CN 105699850 B CN105699850 B CN 105699850B CN 201610185952 A CN201610185952 A CN 201610185952A CN 105699850 B CN105699850 B CN 105699850B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 58
- 230000005611 electricity Effects 0.000 claims abstract description 34
- 230000001681 protective effect Effects 0.000 claims description 36
- 238000009434 installation Methods 0.000 claims description 6
- 241001131927 Placea Species 0.000 claims description 3
- 230000001012 protector Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 230000007812 deficiency Effects 0.000 description 1
- 230000006698 induction 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 current in the fault point phase characteristic.The method of the present invention constitutes transmission lines earth fault phase selection criterion, accurate judgement transmission line of electricity ground short circuit fault type using the phase relation between the phase relation between fault point zero-sequence current and fault point A phase negative-sequence currents and fault point zero-sequence current and fault point A phase forward-order currents.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 in the entire failure process of transmission lines earth fault; 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 utilization current in the fault point phase
Position characteristic realizes 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
Ground short circuit failure realizes line-to-ground fault phase-selecting method using current in the fault point phase characteristic.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
Line-to-ground fault phase-selecting method is realized using current in the fault point phase characteristic, is characterized by, is included as follows
Step：
(1) zero-sequence current of the ends protector measuring transmission line of electricity m protection installation placeResidual voltageA phase negative phase-sequences
Electric currentA phase forward-order currentsA phase negative sequence voltagesWith A phase positive sequence voltagesMeasure the protection of the ends transmission line of electricity n
The zero-sequence current of installation placeA phase negative-sequence currentsWith A phase forward-order currents
(2) protective device judgesAndIt is whether true, if so, then protective device judges
For A phase transmission line of electricity single phase ground fault failures；Wherein, γ0For power transmission line zero-sequence propagation constant；γ1For transmission line of electricity
Positive sequence propagation constant；Zc0For power transmission line zero-sequence wave impedance；Zc1For electric transmission line positive sequence wave impedance；lmnFor transmission line length；
Cosh () is hyperbolic cosine function；Sinh () is hyperbolic sine function；
(3) protective device judgesAndIt is whether true, if so, then protective device judges
Ground short circuit failure occurs for BC phase transmission lines of electricity；
(4) protective device judgesAndIt is whether true, if so, then protective device judges
For B phase transmission line of electricity single phase ground fault failures；
(5) protective device judgesAndIt is whether true, if so, then protective device judges
Ground short circuit failure occurs for CA phase transmission lines of electricity；
(6) protective device judgesAndIt is whether true, if so, then protective device judges
For 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
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 phase relation and fault point between fault point zero-sequence current and fault point A phase negative-sequence currents
Phase relation between zero-sequence current and fault point A phase forward-order currents constitutes transmission lines earth fault phase selection criterion, accurately sentences
Disconnected transmission line of electricity ground short circuit fault type.Transmission line of electricity is varied widely in light current source and system operation mode
When high resistance ground short trouble occurs, the method for the present invention all has enough in the entire failure process of transmission lines earth fault
High phase selection sensitivity can be accurately judged to specific earth fault phase, can be that distance protection and automatic reclosing correctly act
Correct reliable fault phase information is provided.
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, CVT is mutual induction of voltage
Device.Protect the zero-sequence current of installation place in the ends protector measuring transmission line of electricity mResidual voltageA phase negative-sequence currentsA phase forward-order currentsA phase negative sequence voltagesWith A phase positive sequence voltagesMeasure the protection installation of the ends transmission line of electricity n
The zero-sequence current at placeA phase negative-sequence currentsWith A phase forward-order currents
Protective device judgesAndIt is whether true, if so, then protective device judges
For A phase transmission line of electricity single phase ground fault failures；Wherein, γ0For power transmission line zero-sequence propagation constant；γ1For transmission line of electricity
Positive sequence propagation constant；Zc0For power transmission line zero-sequence wave impedance；Zc1For electric transmission line positive sequence wave impedance；lmnFor transmission line length；
Cosh () is hyperbolic cosine function；Sinh () is hyperbolic sine function.
Protective device judgesAndIt is whether true, if so, then protective device judges
Ground short circuit failure occurs for BC phase transmission lines of electricity.
Protective device judgesAndIt is whether true, if so, then protective device judges
For B phase transmission line of electricity single phase ground fault failures.
Protective device judgesAndIt is whether true, if so, then protective device judges
Ground short circuit failure occurs for CA phase transmission lines of electricity.
Protective device judgesAndIt is whether true, if so, then protective device judges
For C phase transmission line of electricity single phase ground fault failures.
Protective device judgesAndIt is whether true, if so, then protective device is judged as
Ground short circuit failure occurs for AB phase transmission lines of electricity.
The method of the present invention utilizes phase relation and fault point between fault point zero-sequence current and fault point A phase negative-sequence currents
Phase relation between zero-sequence current and fault point A phase forward-order currents constitutes transmission lines earth fault phase selection criterion, accurately sentences
Disconnected transmission line of electricity ground short circuit fault type.Transmission line of electricity is varied widely in light current source and system operation mode
When high resistance ground short trouble occurs, the method for the present invention all has enough in the entire failure process of transmission lines earth fault
High phase selection sensitivity can be accurately judged to specific earth fault phase, can be that distance protection and automatic reclosing correctly act
Correct reliable fault phase information is provided.
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 current in the fault point phase characteristic, which is characterized in that include the following steps：
(1) zero-sequence current of the ends protector measuring transmission line of electricity m protection installation placeResidual voltageA phase negative-sequence currentsA phase forward-order currentsA phase negative sequence voltagesWith A phase positive sequence voltagesMeasure the protection installation of the ends transmission line of electricity n
The zero-sequence current at placeA phase negative-sequence currentsWith A phase forward-order currents
(2) protective device judgesAndIt is whether true, if so, then protective device judges
For A phase transmission line of electricity single phase ground fault failures；Wherein, γ0For power transmission line zero-sequence propagation constant；γ1For transmission line of electricity
Positive sequence propagation constant；Zc0For power transmission line zero-sequence wave impedance；Zc1For electric transmission line positive sequence wave impedance；lmnFor transmission line length；
Cosh () is hyperbolic cosine function；Sinh () is hyperbolic sine function；
(3) protective device judgesAndIt is whether true, if so, then protective device is sentenced
Break and 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 judges
For B phase transmission line of electricity single phase ground fault failures；
(5) protective device judgesAndIt is whether true, if so, then protective device judges
Two-phase short circuit and ground fault occurs for CA phase transmission lines of electricity；
(6) protective device judgesAndIt is whether true, if so, then protective device judges
For 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
Two-phase short circuit and ground fault occurs for AB phase transmission lines of electricity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610185952.4A CN105699850B (en) | 2016-03-29 | 2016-03-29 | Line-to-ground fault phase-selecting method is realized using current in the fault point phase characteristic |
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| CN201610185952.4A CN105699850B (en) | 2016-03-29 | 2016-03-29 | Line-to-ground fault phase-selecting method is realized using current in the fault point phase characteristic |
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| CN105699850A CN105699850A (en) | 2016-06-22 |
| CN105699850B true CN105699850B (en) | 2018-10-16 |
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| CN109085450B (en) * | 2018-08-24 | 2020-10-09 | 国网河北省电力有限公司电力科学研究院 | Fault phase selection method and device for low-current grounding system |
| CN109669093A (en) * | 2018-12-13 | 2019-04-23 | 南京正锐电力科技有限公司 | A kind of non-effectively earthed system line-to-ground fault detection method |
| CN109921393B (en) * | 2019-03-22 | 2020-12-08 | 天津大学 | Voltage phase differential protection method for half-wavelength power transmission line |
Citations (4)
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|---|---|---|---|---|
| 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 |
| CN103368151A (en) * | 2013-06-18 | 2013-10-23 | 国家电网公司 | Method of realizing line-to-ground fault phase selection by using sequence voltage phase characteristic |
| 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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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 |
| CN103368151A (en) * | 2013-06-18 | 2013-10-23 | 国家电网公司 | Method of realizing line-to-ground fault phase selection by using sequence voltage phase characteristic |
| 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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| 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 * |
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