CN103296656B - There is the composite sequence component voltage protection method of power transmission line of phase-selecting function - Google Patents
There is the composite sequence component voltage protection method of power transmission line of phase-selecting function Download PDFInfo
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- CN103296656B CN103296656B CN201310185787.9A CN201310185787A CN103296656B CN 103296656 B CN103296656 B CN 103296656B CN 201310185787 A CN201310185787 A CN 201310185787A CN 103296656 B CN103296656 B CN 103296656B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002131 composite material Substances 0.000 title claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000001012 protector Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Abstract
The invention discloses a kind of composite sequence component voltage protection method of power transmission line with phase-selecting function.The inventive method calculates the real part of the ratio of fault phase negative-sequence current and zero-sequence current; the real part of the ratio of fault phase negative-sequence current and zero-sequence current is utilized to thoroughly deserve direction coefficient divided by itself; the residual voltage at computing electric power line protection seting scope place; the equivalent negative sequence voltage at computing electric power line protection seting scope place, utilizes the residual voltage at line protection setting range place, equivalent negative sequence voltage and direction coefficient to form composite sequence component voltage Protection criteria.The inventive method utilizes transmission line residual voltage along the line and negative sequence voltage distribution character to realize the relaying protection of transmission line one-phase earth fault; principle eliminates the impact of transition resistance on Perfomance of protective relaying, performance is not subject to the impact of load current and abort situation.<!--1-->
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of composite sequence component voltage protection method of power transmission line with phase-selecting function.
Background technology
The protection of power frequency variation distance forms distance protection by reaction operating voltage amplitude Sudden Changing Rate, and the method has affects the advantages such as little and anti-transition resistance ability is strong by power system operation mode.But the operating voltage amplitude Sudden Changing Rate adopted due to the method only exists at the fault initial stage, the backup protection of ultra-high/extra-high voltage transmission line of alternation current cannot be used as.
Impedance distance protection is positioned at protection zone according to measurement impedance size faults distance length to distinguish fault point or is positioned at outside protection zone.Impedance distance protection due to by power system operation mode and structural change little, the electric parameters for computation and measurement impedance is total failure component, is applicable to whole failure process.Therefore, impedance distance protection both can be used for ultra-high-tension power transmission line main protection, also can be used as the backup protection of ultra-high/extra-high voltage transmission line of alternation current.But impedance distance protection performance affects seriously by transition resistance, if main manifestations is additional impedance that transition resistance produces is resistance sense impedance distance protection tripping when easily causing line protection troubles inside the sample space; If the additional impedance that transition resistance produces be capacitance-resistance when easily causing line protection external area error, impedance distance protection action generation surmounts.
Super/extreme pressure transmission line of alternation current is also often heavy load transmission line, heavy load electric current can make impedance distance protection malfunction or tripping, and the impact of heavy load electric current on impedance distance protection performance can not be ignored.Transmission line fault-free in overload transmission of electricity situation; the measurement impedance of traditional distance protection is owing to affecting meeting substantial deviation actual measurement impedance by overload electric current; easily cause traditional distance protection misoperation and cause grid power blackout expanded range; even cause the large transfer of load to threaten other transmission lines normally to run, bring huge potential safety hazard to power grid security.
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 composite sequence component voltage protection method of power transmission line with phase-selecting function that transition resistance, abort situation and load current affect.
There is the composite sequence component voltage protection method of power transmission line of phase-selecting function, it is characterized in that, comprise the steps:
(1) the fault phase negative sequence voltage of protector measuring line protection installation place
, fault phase negative-sequence current
, residual voltage
and zero-sequence current
; Wherein, φ=A phase, B phase, C phase;
(2) protective device judges
whether set up, if set up, then protective device sends action trip signal, the circuit breaker at tripping φ phase transmission line two ends; Wherein, φ=A phase, B phase, C phase; x
setfor line protection setting range;
,
be respectively fault phase negative-sequence current
real part, imaginary part;
,
be respectively zero-sequence current
real part, imaginary part; z
1for unit length electric transmission line positive sequence impedance; z
0for unit length power transmission line zero-sequence impedance.
The present invention compared with prior art, has following positive achievement:
The inventive method calculates the real part of the ratio of fault phase negative-sequence current and zero-sequence current; the real part of the ratio of fault phase negative-sequence current and zero-sequence current is utilized to thoroughly deserve direction coefficient divided by itself; the residual voltage at computing electric power line protection seting scope place; the equivalent negative sequence voltage at computing electric power line protection seting scope place, utilizes the residual voltage at line protection setting range place, equivalent negative sequence voltage and direction coefficient to form composite sequence component voltage Protection criteria.The inventive method utilizes transmission line residual voltage along the line and negative sequence voltage distribution character to realize the relaying protection of transmission line one-phase earth fault; principle eliminates the impact of transition resistance on Perfomance of protective relaying, performance is not subject to the impact of load current and abort situation.
Accompanying drawing explanation
Fig. 1 is application multi-line power transmission system schematic of the present invention.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is expressed in further detail.
Fig. 1 is application multi-line power transmission system schematic of the present invention.In Fig. 1, CVT is voltage transformer, CT is current transformer.The current waveform of protective device to the potential and current transformers CT of the voltage transformer CVT of line protection installation place carries out sampling and obtains voltage, current instantaneous value, and voltage, current instantaneous value that then protective device collects it utilize Fourier algorithm computing electric power line to protect the fault phase negative sequence voltage of installation place
, fault phase negative-sequence current
, residual voltage
and zero-sequence current
; Wherein, φ=A phase, B phase, C phase.
Protective device calculated direction coefficient
; Wherein,
,
be respectively fault phase negative-sequence current
real part, imaginary part;
,
be respectively zero-sequence current
real part, imaginary part; φ=A phase, B phase, C phase.
The residual voltage at protective device computing electric power line protection seting scope place
; Wherein, x
setfor line protection setting range.
The equivalent negative sequence voltage at protective device computing electric power line protection seting scope place
; Wherein, z
1for unit length electric transmission line positive sequence impedance; z
0for unit length power transmission line zero-sequence impedance; φ=A phase, B phase, C phase; x
setfor line protection setting range.
Protective device judges
whether set up, if set up, then protective device sends action trip signal, the circuit breaker at tripping φ phase transmission line two ends; Wherein, φ=A phase, B phase, C phase.
The inventive method calculates the real part of the ratio of fault phase negative-sequence current and zero-sequence current; the real part of the ratio of fault phase negative-sequence current and zero-sequence current is utilized to thoroughly deserve direction coefficient divided by itself; the residual voltage at computing electric power line protection seting scope place; the equivalent negative sequence voltage at computing electric power line protection seting scope place, utilizes the residual voltage at line protection setting range place, equivalent negative sequence voltage and direction coefficient to form composite sequence component voltage Protection criteria.The inventive method utilizes transmission line residual voltage along the line and negative sequence voltage distribution character to realize the relaying protection of transmission line one-phase earth fault; principle eliminates the impact of transition resistance on Perfomance of protective relaying, performance is not subject to the impact of load current and abort situation.
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. there is the composite sequence component voltage protection method of power transmission line of phase-selecting function, it is characterized in that, comprise following sequential steps:
(1) the fault phase negative sequence voltage of protector measuring line protection installation place
, fault phase negative-sequence current
, residual voltage
and zero-sequence current
; Wherein, φ=A phase, B phase, C phase;
(2) protective device judges
whether set up, if set up, then protective device sends action trip signal, the circuit breaker at tripping φ phase transmission line two ends; Wherein, φ=A phase, B phase, C phase; x
setfor line protection setting range;
,
be respectively fault phase negative-sequence current
real part, imaginary part;
,
be respectively zero-sequence current
real part, imaginary part; z
1for unit length electric transmission line positive sequence impedance; z
0for unit length power transmission line zero-sequence impedance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185787.9A CN103296656B (en) | 2013-05-19 | 2013-05-19 | There is the composite sequence component voltage protection method of power transmission line of phase-selecting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185787.9A CN103296656B (en) | 2013-05-19 | 2013-05-19 | There is the composite sequence component voltage protection method of power transmission line of phase-selecting function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103296656A CN103296656A (en) | 2013-09-11 |
| CN103296656B true CN103296656B (en) | 2016-03-30 |
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|---|---|---|---|
| CN201310185787.9A Active CN103296656B (en) | 2013-05-19 | 2013-05-19 | There is the composite sequence component voltage protection method of power transmission line of phase-selecting function |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887771A (en) * | 2014-04-23 | 2014-06-25 | 国家电网公司 | Method for identifying fault branches on basis of zero and negative sequence integrated current |
| CN113009375B (en) * | 2021-02-23 | 2022-02-01 | 重庆大学 | Power distribution network disconnection and grounding composite fault protection method considering transition resistance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1870717A1 (en) * | 2006-06-20 | 2007-12-26 | ABB Technology AG | System and method for determining phase-to-earth admittances of a three-phase electric line |
| CN101183133A (en) * | 2007-11-29 | 2008-05-21 | 北京四方继保自动化股份有限公司 | Phase amount and zero sequence amount combined realization powerline both-end distance measuring method |
-
2013
- 2013-05-19 CN CN201310185787.9A patent/CN103296656B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1870717A1 (en) * | 2006-06-20 | 2007-12-26 | ABB Technology AG | System and method for determining phase-to-earth admittances of a three-phase electric line |
| CN101183133A (en) * | 2007-11-29 | 2008-05-21 | 北京四方继保自动化股份有限公司 | Phase amount and zero sequence amount combined realization powerline both-end distance measuring method |
Non-Patent Citations (1)
| Title |
|---|
| 一种基于分布参数模型的线路相间距离保护方法;马静等;《电力系统保护与控制》;20120216;第40卷(第4期);第32-36页 * |
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