CN103760458B - Analyses for double circuits on same tower single-phase earthing fault direction method of discrimination - Google Patents
Analyses for double circuits on same tower single-phase earthing fault direction method of discrimination Download PDFInfo
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- CN103760458B CN103760458B CN201410053692.6A CN201410053692A CN103760458B CN 103760458 B CN103760458 B CN 103760458B CN 201410053692 A CN201410053692 A CN 201410053692A CN 103760458 B CN103760458 B CN 103760458B
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Abstract
The invention discloses a kind of analyses for double circuits on same tower single-phase earthing fault direction method of discrimination.The inventive method measures the faulted phase voltage of single back line in analyses for double circuits on same tower, residual voltage and zero-sequence current; utilize residual voltage to deduct faulted phase voltage and obtain compound polarizing voltage; utilize the angle relationship between zero-sequence current and compound polarizing voltage to form direction criterion, accurately differentiate protected circuit generation positive dirction fault or reverse direction failure occurs.The inventive method utilizes the angle relationship between zero-sequence current and compound polarizing voltage to form direction criterion; principle eliminates zero-sequence mutual inductance between line and protection is moved to the impact of performance; accurate Judging fault direction, during effectively anti-only protected circuit reverse direction failure, protective relaying maloperation is done.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of analyses for double circuits on same tower single-phase earthing fault direction method of discrimination.
Background technology
Analyses for double circuits on same tower has that floor area is few, cost is low, connects operation of power networks reliable and stable, has become a kind of common transmission line of electricity connected mode of electric system.After one loop line road generation singlephase earth fault of analyses for double circuits on same tower, the zero-sequence current flowing through faulty line produces induction residual voltage by zero-sequence mutual inductance between line on connected circuit, by the impact of induction residual voltage, the protected circuit erroneous judgement normally run can be faulty line by zero-sequence direction component, cause zero-sequence direction component misoperation, especially when there is single-phase high-impedance in a loop line road of analyses for double circuits on same tower, by the impact of induction residual voltage, zero-sequence direction component is misoperation usually, cause normal working line to be excised by mistake, very adverse influence is brought to power network safety operation.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, provide a kind of performance not by the analyses for double circuits on same tower single-phase earthing fault direction method of discrimination based on compound polarizing voltage that zero-sequence mutual inductance between line affects.
For completing above-mentioned purpose, the present invention adopts following technical scheme:
Analyses for double circuits on same tower single-phase earthing fault direction method of discrimination, comprises following sequential steps:
(1) protector measuring analyses for double circuits on same tower I returns the faulted phase voltage of route protection installation place
zero-sequence current
and residual voltage
wherein, φ is A phase or B phase or C phase;
(2) protective device calculates compound polarizing voltage
(3) protective device calculates zero-sequence current
leading compound polarizing voltage
phase angle
(4) protective device judges
whether set up, if set up, then protective device judges the φ phase circuit positive dirction generation earth fault on analyses for double circuits on same tower I loop line road; Wherein, Z
i0for I returns the zero sequence system equivalent impedance of route protection installation place; φ is A phase or B phase or C phase; Arg (Z
i0) be Z
i0phase angle.
Feature of the present invention and technological achievement:
The inventive method measures the faulted phase voltage of single back line in analyses for double circuits on same tower, residual voltage and zero-sequence current; utilize residual voltage to deduct faulted phase voltage and obtain compound polarizing voltage; utilize the angle relationship between zero-sequence current and compound polarizing voltage to form direction criterion, accurately differentiate protected circuit generation positive dirction fault or reverse direction failure occurs.
The inventive method utilizes the angle relationship between zero-sequence current and compound polarizing voltage to form direction criterion; principle eliminates zero-sequence mutual inductance between line and protection is moved to the impact of performance; accurate Judging fault direction, during effectively anti-only protected circuit reverse direction failure, protective relaying maloperation is done.
Accompanying drawing explanation
Fig. 1 is application analyses for double circuits on same tower transmission system schematic diagram of the present invention.
Embodiment
Hereafter by reference to the accompanying drawings and embodiment the present invention will be further described.
Fig. 1 is application analyses for double circuits on same tower transmission system schematic diagram of the present invention.Protector measuring analyses for double circuits on same tower I returns the faulted phase voltage of route protection installation place
zero-sequence current
and residual voltage
wherein, φ is A phase or B phase or C phase.
Protective device calculates compound polarizing voltage
wherein, φ is A phase or B phase or C phase.
Protective device calculates zero-sequence current
leading compound polarizing voltage
phase angle
Protective device judges
whether set up, if set up, then protective device judges the φ phase circuit positive dirction generation earth fault on analyses for double circuits on same tower I loop line road.
Wherein, Z
i0for I returns the zero sequence system equivalent impedance of route protection installation place; φ is A phase or B phase or C phase; Arg (Z
i0) be Z
i0phase angle.
The inventive method measures the faulted phase voltage of single back line in analyses for double circuits on same tower, residual voltage and zero-sequence current; utilize residual voltage to deduct faulted phase voltage and obtain compound polarizing voltage; utilize the angle relationship between zero-sequence current and compound polarizing voltage to form direction criterion, accurately differentiate protected circuit generation positive dirction fault or reverse direction failure occurs.
The inventive method utilizes the angle relationship between zero-sequence current and compound polarizing voltage to form direction criterion; principle eliminates zero-sequence mutual inductance between line and protection is moved to the impact of performance; accurate Judging fault direction, during effectively anti-only protected circuit reverse direction failure, protective relaying maloperation is done.
The foregoing is only preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (1)
1. analyses for double circuits on same tower single-phase earthing fault direction method of discrimination, comprises following sequential steps:
(1) protector measuring analyses for double circuits on same tower I returns the fault φ phase voltage of route protection installation place
zero-sequence current
and residual voltage
wherein, φ is A phase or B phase or C phase;
(2) protective device calculates compound polarizing voltage
(3) protective device calculates zero-sequence current
leading compound polarizing voltage
phase angle
(4) protective device judges
whether set up, if set up, then protective device judges the φ phase circuit positive dirction generation earth fault on analyses for double circuits on same tower I loop line road; Wherein, Z
i0for I returns the zero sequence system equivalent impedance of route protection installation place; φ is A phase or B phase or C phase; Arg (Z
i0) be Z
i0phase angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053692.6A CN103760458B (en) | 2014-02-18 | 2014-02-18 | Analyses for double circuits on same tower single-phase earthing fault direction method of discrimination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053692.6A CN103760458B (en) | 2014-02-18 | 2014-02-18 | Analyses for double circuits on same tower single-phase earthing fault direction method of discrimination |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103760458A CN103760458A (en) | 2014-04-30 |
| CN103760458B true CN103760458B (en) | 2016-01-20 |
Family
ID=50527727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410053692.6A Active CN103760458B (en) | 2014-02-18 | 2014-02-18 | Analyses for double circuits on same tower single-phase earthing fault direction method of discrimination |
Country Status (1)
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| CN (1) | CN103760458B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954879B (en) * | 2014-05-09 | 2016-11-02 | 浙江大学 | A kind of band shunt reactor double circuit lines character method of discrimination |
| CN104950225A (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | Double-circuit line different phase overline grounding fault direction decision method |
| CN106410764B (en) * | 2016-10-21 | 2018-12-28 | 云南电网有限责任公司电力科学研究院 | A kind of calculation method and device of positive sequence polarization voltage |
| CN113687267B (en) * | 2021-09-14 | 2023-08-04 | 广东电网有限责任公司 | High-resistance ground fault direction detection method, system, equipment and storage medium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000074978A (en) * | 1998-08-31 | 2000-03-14 | Nissin Electric Co Ltd | Fault point locator at parallel two-line transmission line |
| CN101814730B (en) * | 2009-04-15 | 2012-12-05 | 河南省电力公司 | Fault phase selection method of double transmission line protection on the same pole |
| CN101635453A (en) * | 2009-08-20 | 2010-01-27 | 中国电力科学研究院 | Method and device for limiting secondary arc current of extra-high voltage same tower double circuit line |
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2014
- 2014-02-18 CN CN201410053692.6A patent/CN103760458B/en active Active
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Address after: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Co-patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Address before: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee before: State Grid Corporation of China Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. |
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Address after: 351100 No. 999, South Garden Road, Xia Lin Street, Chengxiang District, Putian, Fujian Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Co-patentee after: STATE GRID CORPORATION OF CHINA Address before: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee before: State Grid Corporation of China Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. |