CN104360232A - Line phase fault discrimination method based on phase characteristics of fault position factor - Google Patents
Line phase fault discrimination method based on phase characteristics of fault position factor Download PDFInfo
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- CN104360232A CN104360232A CN201410646262.5A CN201410646262A CN104360232A CN 104360232 A CN104360232 A CN 104360232A CN 201410646262 A CN201410646262 A CN 201410646262A CN 104360232 A CN104360232 A CN 104360232A
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Abstract
The invention discloses a line phase fault discrimination method based on phase characteristics of a fault position factor. According to the method, the physical characteristics of the voltage and current transmission of a power transmission line are accurately described through a long-line equation. The method includes the steps of firstly, calculating the ratio of the fault impedance between a power transmission line protection and installation position and a phase fault point to the line impedance between the power transmission line protection and installation position and the power transmission line protection and setting range so as to obtain the power transmission line phase fault position factor b; secondly, accurately judging whether the phase fault happens in the power transmission line protection reverse direction or the power transmission line protection forward direction or not by judging whether the requirement that the power transmission line phase fault position factor b is smaller than 0 or larger than 0 is met or not. The influences of the voltage, the transmission resistance and the load current of the phase fault point on the power transmission line phase fault direction discrimination result are effectively eliminated on principle, the power transmission line phase spacing protection malfunction is effectively prevented, and the method is particularly suitable for the ultra-high voltage alternating-current power transmission line phase fault relay protection.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of based on abort situation factor phase characteristic line inter-phase fault method of discrimination.
Background technology
Distance protection due to by power system operation mode and structural change little, moment selectively can excise transmission line of electricity various fault, be applied widely in power system transmission line protection.On ultra-high-tension power transmission line, distance protection is used as transmission line of electricity main protection, and on ultra-high/extra-high voltage transmission line of alternation current, distance protection is used as transmission line of electricity back-up protection.The distance protection of current power system transmission line widespread use mainly comprises the protection of power frequency variation distance and impedance distance protection.
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, cannot be used as the back-up protection of ultra-high/extra-high voltage transmission line of alternation current.
Impedance distance protection is positioned at protected location according to fault impedance size faults distance length to distinguish trouble spot or is positioned at outside protected location.Impedance distance protection due to by power system operation mode and structural change little, being total failure component for calculating the electric parameters of fault impedance, being 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 back-up protection of ultra-high/extra-high voltage transmission line of alternation current.
But Conventional impedance distance protection hypotheses fault point voltage is zero, calculate fault impedance by current ratio between fault voltage between phases and fault phase, and whether the distance carrying out faults point according to fault impedance size sends trip signal with decision.In fact, in electric system, except the metallic short circuit fault of arteface, fault point voltage may be zero hardly, and therefore, fault point voltage can cause impedance distance protection performance and have a strong impact on.
In practical power systems, the voltage of ultrahigh voltage alternating current transmission lines, current delivery have obvious wave process, and capacitance current along the line is large, can not ignore the impact of impedance distance protection performance.Consider the impact of circuit ground capacitance along the line, fault impedance and fault distance are hyperbolic tangent function relation, hyperbolic tangent function characteristic determines the resistance to transition resistance ability of impedance relay, and the additional impedance that transition resistance brings will have a strong impact on the performance of impedance relay.Extreme pressure transmission line of alternation current conveying Large Copacity electric energy, be heavy load transmission line of electricity, heavy load electric current can make the action sensitivity of impedance distance protection reduce, and the impact of heavy load electric current on impedance distance protection performance can not be ignored.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, provide a kind of based on abort situation factor phase characteristic line inter-phase fault method of discrimination.The inventive method first computing electric power line protection installation place to the fault impedance of phase fault point and line protection installation place to the ratio of the line impedance at line protection setting range place, obtain electric transmission line phase fault location factor b, then by judging that electric transmission line phase fault location factor b is less than 0 or be greater than 0 and whether set up, accurately to judge that line protection phase fault or line protection positive dirction generation phase fault occurs in the other direction, if line protection positive dirction generation phase fault, protective device sends action trip signal, the isolating switch at tripping transmission line of electricity two ends, principle eliminates phase fault point voltage, transition resistance and load current are on the impact of electric transmission line phase fault discriminating direction result, effectively prevent the misoperation of transmission line of electricity phase distance protection, be specially adapted to the relay protection of ultrahigh voltage alternating current transmission lines phase-to phase fault.
For completing above-mentioned purpose, the present invention adopts following technical scheme:
Based on abort situation factor phase characteristic line inter-phase fault method of discrimination, it is characterized in that, comprise following sequential steps:
(1) the fault voltage between phases of protector measuring line protection installation place
fault three-phase current
and negative-sequence current between fault phase
wherein, φ φ=AB, BC, CA phase;
(2) protective device calculates γ
1l
sethyperbolic cosine function value ch (γ
1l
set), calculate γ
1l
sethyperbolic tangent function value th (γ
1l
set); Wherein, l
setfor line protection setting range, get 0.85 times of transmission line length; γ
1for electric transmission line positive sequence propagation coefficient;
(3) protective device computing electric power line phase-to phase fault location factor b:
Wherein, φ φ=AB, BC, CA phase; l
setfor line protection setting range, get 0.85 times of transmission line length; γ
1for electric transmission line positive sequence propagation coefficient; Z
c1for electric transmission line positive sequence wave impedance;
for
real part;
for
imaginary part;
for
real part;
for
imaginary part;
for
real part;
for
imaginary part;
(4) protective device judges that transmission line malfunction location factor b is less than 0 and whether sets up, if set up, then judges that line protection phase fault occurs in the other direction;
(5) protective device judges that transmission line malfunction location factor b is greater than 0 and whether sets up, if set up, then judge line protection positive dirction generation phase fault, protective device sends action trip signal, the isolating switch at tripping transmission line of electricity two ends.
The present invention compared with prior art, has following positive achievement:
The inventive method adopts long-line equation accurately to describe the physical characteristics of transmission line of electricity, has the ability of natural anti-distributed capacitance impact.The inventive method first computing electric power line protection installation place to the fault impedance of phase fault point and line protection installation place to the ratio of the line impedance at line protection setting range place, obtain electric transmission line phase fault location factor b, then by judging that electric transmission line phase fault location factor b is less than 0 or be greater than 0 and whether set up, accurately to judge that line protection phase fault or line protection positive dirction generation phase fault occurs in the other direction, if line protection positive dirction generation phase fault, protective device sends action trip signal, the isolating switch at tripping transmission line of electricity two ends, principle eliminates phase fault point voltage, transition resistance and load current are on the impact of electric transmission line phase fault discriminating direction result, effectively prevent the misoperation of transmission line of electricity phase distance protection, be specially adapted to the relay protection of ultrahigh voltage alternating current transmission lines phase-to phase fault.
Accompanying drawing explanation
Fig. 1 is application multi-line power transmission system schematic of the present invention.
Embodiment
According to Figure of description, technical scheme of the present invention is expressed in further detail below.
Fig. 1 is application multi-line power transmission system schematic of the present invention.In Fig. 1, CVT is voltage transformer (VT), CT is current transformer.The current waveform of protective device to the potential and current transformers CT of the voltage transformer (VT) CVT of line protection installation place carries out sampling and obtains voltage, current instantaneous value.
The voltage that protective device obtains sampling, current instantaneous value utilize Fourier algorithm computing electric power line to protect the fault voltage between phases of installation place
fault three-phase current
and negative-sequence current between fault phase
wherein, φ φ=AB, BC, CA phase.
Protective device calculates γ
1l
sethyperbolic cosine function value ch (γ
1l
set).
Protective device calculates γ
1l
sethyperbolic tangent function value th (γ
1l
set).
Wherein, l
setfor line protection setting range, get 0.85 times of transmission line length; γ
1for electric transmission line positive sequence propagation coefficient.
Protective device computing electric power line phase-to phase fault location factor b:
Wherein, φ φ=AB, BC, CA phase; l
setfor line protection setting range, get 0.85 times of transmission line length; γ
1for electric transmission line positive sequence propagation coefficient; Z
c1for electric transmission line positive sequence wave impedance;
for
real part;
for
imaginary part;
for
real part;
for
imaginary part;
for
real part;
for
imaginary part.
Protective device judges that transmission line malfunction location factor b is less than 0 and whether sets up, if set up, then judges that line protection phase fault occurs in the other direction.
Protective device judges that transmission line malfunction location factor b is greater than 0 and whether sets up, if set up, then judge line protection positive dirction generation phase fault, protective device sends action trip signal, the isolating switch at tripping transmission line of electricity two ends.
The inventive method adopts long-line equation accurately to describe the physical characteristics of transmission line of electricity, has the ability of natural anti-distributed capacitance impact.The inventive method first computing electric power line protection installation place to the fault impedance of phase fault point and line protection installation place to the ratio of the line impedance at line protection setting range place, obtain electric transmission line phase fault location factor b, then by judging that electric transmission line phase fault location factor b is less than 0 or be greater than 0 and whether set up, accurately to judge that line protection phase fault or line protection positive dirction generation phase fault occurs in the other direction, if line protection positive dirction generation phase fault, protective device sends action trip signal, the isolating switch at tripping transmission line of electricity two ends, principle eliminates phase fault point voltage, transition resistance and load current are on the impact of electric transmission line phase fault discriminating direction result, effectively prevent the misoperation of transmission line of electricity phase distance protection, be specially adapted to the relay protection of ultrahigh voltage alternating current transmission lines phase-to phase fault.
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., based on abort situation factor phase characteristic line inter-phase fault method of discrimination, it is characterized in that, comprise following sequential steps:
(1) the fault voltage between phases of protector measuring line protection installation place
fault three-phase current
and negative-sequence current between fault phase
wherein, φ φ=AB, BC, CA phase;
(2) protective device calculates γ
1l
sethyperbolic cosine function value ch (γ
1l
set), calculate γ
1l
sethyperbolic tangent function value th (γ
1l
set); Wherein, l
setfor line protection setting range, get 0.85 times of transmission line length; γ
1for electric transmission line positive sequence propagation coefficient.
(3) protective device computing electric power line phase-to phase fault location factor b:
Wherein, φ φ=AB, BC, CA phase; l
setfor line protection setting range, get 0.85 times of transmission line length;
γ 1for electric transmission line positive sequence propagation coefficient; Z
c1for electric transmission line positive sequence wave impedance;
for
real part;
for
imaginary part;
for
real part;
for
imaginary part;
for
real part;
for
imaginary part;
(4) protective device judges that transmission line malfunction location factor b is less than 0 and whether sets up, if set up, then judges that line protection phase fault occurs in the other direction;
(5) protective device judges that transmission line malfunction location factor b is greater than 0 and whether sets up, if set up, then judge line protection positive dirction generation phase fault, protective device sends action trip signal, the isolating switch at tripping transmission line of electricity two ends.
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4906937A (en) * | 1988-03-25 | 1990-03-06 | Asea Brown Boveri Ab | Method and a device for fault location in the event of a fault on a power transmission line |
CN102195277A (en) * | 2011-05-26 | 2011-09-21 | 西安工程大学 | Current differential protection method of transmission line based on fine compensation of capacitance current |
CN103762567A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Electric transmission line single-phase earth fault relay protection method based on fault position factor |
CN104092201A (en) * | 2014-07-25 | 2014-10-08 | 国家电网公司 | Remote ultra-high voltage alternating-current transmission line fault determination method |
-
2014
- 2014-11-14 CN CN201410646262.5A patent/CN104360232A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4906937A (en) * | 1988-03-25 | 1990-03-06 | Asea Brown Boveri Ab | Method and a device for fault location in the event of a fault on a power transmission line |
CN102195277A (en) * | 2011-05-26 | 2011-09-21 | 西安工程大学 | Current differential protection method of transmission line based on fine compensation of capacitance current |
CN103762567A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Electric transmission line single-phase earth fault relay protection method based on fault position factor |
CN104092201A (en) * | 2014-07-25 | 2014-10-08 | 国家电网公司 | Remote ultra-high voltage alternating-current transmission line fault determination method |
Non-Patent Citations (5)
Title |
---|
曾惠敏 等: "基于分布参数输电线路距离保护及低中高电阻短路故障识别", 《电网技术》 * |
林富洪 等: "基于分布参数模型的高压输电线路单相接地故障单端测距方法", 《电网技术》 * |
林富洪: "基于分布参数模型线路保护及故障测距", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
陈文景: "一种线路相间故障测距新方法", 《电力建设》 * |
马静 等: "基于分布参数模型的输电线路相间距离保护", 《电力自动化设备》 * |
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Application publication date: 20150218 |