CN105699852B - The transmission lines earth fault phase-selecting method that capable of preventing distributed capacitive current and transitional resistance influences - Google Patents
The transmission lines earth fault phase-selecting method that capable of preventing distributed capacitive current and transitional resistance influences Download PDFInfo
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- CN105699852B CN105699852B CN201610186342.6A CN201610186342A CN105699852B CN 105699852 B CN105699852 B CN 105699852B CN 201610186342 A CN201610186342 A CN 201610186342A CN 105699852 B CN105699852 B CN 105699852B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000005611 electricity Effects 0.000 claims abstract description 31
- 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
- 230000000644 propagated effect Effects 0.000 claims description 3
- 230000001012 protector Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 239000013598 vector Substances 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 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
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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
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- Locating Faults (AREA)
Abstract
The invention discloses the transmission lines earth fault phase-selecting methods that a kind of capable of preventing distributed capacitive current and transitional resistance influences.The method of the present invention physical model uses distributed parameter model, transmission lines earth fault phase selection criterion, accurate judgement transmission line of electricity ground short circuit fault type are constituted using using residual voltage difference and the phase relation and residual voltage difference of A phase negative-sequence current vector sums and the phase relation of A phase forward-order current vector sums.The method of the present invention physical model uses distributed parameter model, has the ability that natural anti-capacitance current influences, and is suitable for super-pressure, UHV transmission line.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 field, concretely relate to a kind of anti-capacitance current and
The transmission lines earth fault phase-selecting method that transition resistance influences.
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 transmission lines earth fault phase-selecting method that the capable of preventing distributed capacitive current and transitional resistance of ground short circuit failure influences.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
The transmission lines earth fault phase-selecting method that capable of preventing distributed capacitive current and transitional resistance influences, is characterized by, and wraps
Include following sequential steps：
(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 residual voltage of installation placeA phase negative-sequence currentsA phase forward-order currents
(2) protective device judges
AndIt is whether true, if at
Vertical, then protective device is judged as A phase transmission line of electricity single phase ground fault failures；Wherein, γ0It is propagated for power transmission line zero-sequence
Constant；γ1For electric transmission line 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 judges
AndIt 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；
(4) protective device judges
AndIt 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 judges
AndIt 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；
(6) protective device judges
AndIt 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 judges
AndIt is whether true, if so,
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 physical model uses distributed parameter model, has the energy that natural anti-capacitance current influences
Power is suitable for super-pressure, UHV transmission line.The method of the present invention utilizes residual voltage difference and A phase negative-sequence current vectors
The phase relation and residual voltage difference of sum and the phase relation of A phase forward-order current vector sums constitute transmission lines earth fault phase selection
Criterion, accurate judgement transmission line of electricity ground short circuit fault type.Large change feelings occur in light current source and system operation mode
When high resistance ground short trouble occurs for transmission line of electricity under condition, entire failure process of the method for the present invention in transmission lines earth fault
In all there is sufficiently high phase selection sensitivity, specific earth fault phase can be accurately judged to, can be distance protection and automatic weight
Correct action of closing a floodgate provides correct reliable fault phase information.
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 residual voltage at placeA phase negative-sequence currentsA phase forward-order currents
Protective device judges
AndIt is whether true, if at
Vertical, then protective device is judged as A phase transmission line of electricity single phase ground fault failures；Wherein, γ0It is propagated for power transmission line zero-sequence
Constant；γ1For electric transmission line 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 judges
AndIt 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 judges
AndIt 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 judges
AndIt 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 judges
AndIt 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 judges
AndIt is whether true, if so,
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 physical model uses distributed parameter model, has the energy that natural anti-capacitance current influences
Power is suitable for super-pressure, UHV transmission line.The method of the present invention utilizes residual voltage difference and A phase negative-sequence current vectors
The phase relation and residual voltage difference of sum and the phase relation of A phase forward-order current vector sums constitute transmission lines earth fault phase selection
Criterion, accurate judgement transmission line of electricity ground short circuit fault type.
Transmission line of electricity is varied widely in light current source and system operation mode, and high resistance ground short circuit event occurs
When barrier, the method for the present invention all has sufficiently high phase selection sensitivity, energy in the entire failure process of transmission lines earth fault
It is accurately judged to specific earth fault phase, can correctly act and correct reliable failure is provided for distance protection and automatic reclosing
Phase information.
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. the transmission lines earth fault phase-selecting method that capable of preventing distributed capacitive current and transitional resistance influences, which is characterized in that including
Following sequential 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 residual voltage at placeA phase negative-sequence currentsA phase forward-order currents
(2) protective device judges
AndIt is whether true, if at
Vertical, then protective device is judged as A phase transmission line of electricity single phase ground fault failures；Wherein, γ0It is propagated for power transmission line zero-sequence
Constant；γ1For electric transmission line 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 judges
AndIt 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 judges
AndIt 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 judges
AndIt is whether true, if at
Vertical, 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 judges
AndIt 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 judges
AndIt 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 |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
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| CN105699852A CN105699852A (en) | 2016-06-22 |
| CN105699852B true 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110261720B (en) * | 2019-08-06 | 2021-01-29 | 云南电网有限责任公司电力科学研究院 | Single-phase grounding judgment method and device for power distribution network grounding fault |
| 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 |
| 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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| CN1529178A (en) * | 2003-10-09 | 2004-09-15 | 武汉大学 | Electric-power system transmitting-line fault diagnosis and phase selecting method |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE0303615D0 (en) * | 2003-12-31 | 2003-12-31 | Abb Ab | Method and device for Fault Detection in Transformers |
| US7961445B2 (en) * | 2006-07-19 | 2011-06-14 | Khoroshev Mark I | Method of detecting fault extinction during a three-phase autoreclosing cycle in an AC transmission line |
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| CN1529178A (en) * | 2003-10-09 | 2004-09-15 | 武汉大学 | Electric-power system transmitting-line fault diagnosis and phase selecting method |
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