CN104076240B - Ultrahigh voltage alternating current transmission lines three phase short circuit fault recognition methods - Google Patents
Ultrahigh voltage alternating current transmission lines three phase short circuit fault recognition methods Download PDFInfo
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- 230000009471 action Effects 0.000 claims abstract description 6
- 230000001012 protector Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 8
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Abstract
The invention discloses a kind of ultrahigh voltage alternating current transmission lines three phase short circuit fault recognition methods.First three-phase voltage when measurement ultrahigh voltage alternating current transmission lines is properly functioning and three-phase current; measure the three-phase voltage after ultrahigh voltage alternating current transmission lines three phase short circuit fault and three-phase current; calculate and judge when the ultrahigh voltage alternating current transmission lines at ultrahigh voltage alternating current transmission lines protection seting scope is properly functioning, after voltage between phases leading ultrahigh voltage alternating current transmission lines three phase short circuit fault, whether the phase place corner of voltage between phases sets up in the range of (90 ° 270 °), to decide whether to send action trip signal.The inventive method uses distributed constant modeling; the physical process of ultrahigh voltage alternating current transmission lines voltage x current transmission is accurately described; there is the ability of natural anti-capacitance current, and eliminate the factor impacts on Perfomance of protective relaying such as transition resistance, load current and power system operation mode.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, concretely relate to a kind of extra-high-voltage alternating current
Transmission line of electricity three phase short circuit fault recognition methods.
Background technology
Power frequency variation distance protection constitutes distance protection, the method by reaction running voltage amplitude Sudden Changing Rate
Have and affected the advantages such as little and anti-transition resistance ability is strong by power system operation mode.But due to the method institute
The running voltage amplitude Sudden Changing Rate used only exists at the fault initial stage, it is impossible to as ultra-high/extra-high voltage ac transmission
Line backup protection.
Impedance distance protection is positioned at guarantor according to fault impedance size faults distance length to distinguish trouble point
In protecting district or be positioned at outside protection zone.Impedance distance protection is owing to being changed by power system operation mode and structure
Affect little, be total failure component for calculating the electric parameters of fault impedance, it is adaptable to whole failure process.Cause
This, impedance distance protection can be not only used for ultra-high-tension power transmission line main protection, it is possible to defeated as ultra-high/extra-high voltage exchange
Electric line back-up protection.
But, Conventional impedance distance protection hypotheses fault point voltage is zero, by fault voltage between phases and
The alternate current ratio of fault calculates fault impedance, and according to fault impedance size come the distance of faults point with
Decide whether to send trip signal.It practice, in power system, except the metallic short circuit of arteface
Outside fault, fault point voltage is hardly possible is zero, and therefore, impedance distance protection can be moved by fault point voltage
Cause as performance and have a strong impact on.
In practical power systems, the transmission of the voltage of ultrahigh voltage alternating current transmission lines, electric current has obvious ripple mistake
Journey, capacitance current along the line is big, and the impact on impedance distance protection performance can not be ignored.Consider line
The impact of curb line direct-to-ground capacitance, fault impedance and fault distance are hyperbolic tangent function relation, tanh
Function characteristic determines impedance relay resistance to transition resistance ability, and the additional impedance that transition resistance is brought will
Have a strong impact on the performance of impedance relay.Extreme pressure transmission line of alternation current conveying Large Copacity electric energy, is heavy burden
Lotus transmission line of electricity, heavy load electric current can make the action sensitivity of impedance distance protection reduce, heavy load electric current pair
The impact of impedance distance protection performance can not be ignored.
Summary of the invention
It is an object of the invention to the deficiency overcoming prior art to exist, it is provided that a kind of ultra-high voltage AC transmission line
Road three phase short circuit fault recognition methods, the method is sent out in the range of utilizing ultrahigh voltage alternating current transmission lines protection seting
Raw three phase short circuit fault, the ultrahigh voltage alternating current transmission lines at ultrahigh voltage alternating current transmission lines protection seting scope
The phase of voltage between phases after voltage between phases leading ultrahigh voltage alternating current transmission lines three phase short circuit fault time properly functioning
Parallactic angle fall in the range of (90 ° 270 °) this characteristic constitute ultrahigh voltage alternating current transmission lines three-phase shortcircuit therefore
Barrier identical criterion, eliminates capacitance current, transition resistance, load current and power system operation mode
Etc. the factor impact on Perfomance of protective relaying.
For completing above-mentioned purpose, the present invention adopts the following technical scheme that
Ultrahigh voltage alternating current transmission lines three phase short circuit fault recognition methods, including following sequential steps:
(1) three-phase voltage when protector measuring ultrahigh voltage alternating current transmission lines is properly functioning And three-phase currentWherein, φ α β=ABC, BCA, CAB phase；
(2) three-phase voltage after protector measuring ultrahigh voltage alternating current transmission lines three phase short circuit fault And three-phase currentWherein, φ α β=ABC, BCA, CAB phase；
(3) protection device calculates the extra-high voltage friendship of lset point at ultrahigh voltage alternating current transmission lines protection seting scope
α β voltage between phases after stream transmission line of electricity three phase short circuit fault
Wherein, Zc1For ultrahigh voltage alternating current transmission lines positive sequence natural impedance；γ1Pass for ultrahigh voltage alternating current transmission lines positive sequence
Broadcast coefficient；φ α β=ABC, BCA, CAB phase；Th (.) is hyperbolic tangent function；lsetFor ultra-high voltage AC transmission
Route protection setting range；
(4) protection device calculates l at ultrahigh voltage alternating current transmission lines protection seting scopesetThe extra-high voltage of point is handed over
α β voltage between phases when stream transmission line of electricity is properly functioning Wherein, Zc1For ultrahigh voltage alternating current transmission lines just
Sequence natural impedance；γ1For ultrahigh voltage alternating current transmission lines positive sequence propagation coefficient；φ α β=ABC, BCA, CAB phase；
Th (.) is hyperbolic tangent function；lsetFor ultrahigh voltage alternating current transmission lines protection seting scope；
(5) protection device calculatesLeadingPhase angle
(6) protection device judgesLeadingPhase angleFall at (90 °
270 °) in the range of whether set up, if set up, then judge ultrahigh voltage alternating current transmission lines protection seting scope
Interior generation three phase short circuit fault, sends action trip signal, the three of tripping ultrahigh voltage alternating current transmission lines two ends
Phase chopper.
The present invention compared with prior art, has a following positive achievement:
The inventive method first measure ultrahigh voltage alternating current transmission lines properly functioning time three-phase voltage and three-phase
Electric current, measures the three-phase voltage after ultrahigh voltage alternating current transmission lines three phase short circuit fault and three-phase current, calculates
And judge that the ultrahigh voltage alternating current transmission lines at ultrahigh voltage alternating current transmission lines protection seting scope is properly functioning
Time voltage between phases leading ultrahigh voltage alternating current transmission lines three phase short circuit fault after the phase place corner of voltage between phases exist
Whether set up in the range of (90 °-270 °), to decide whether to send action trip signal.The inventive method
Employing distributed constant models, and accurately describes the physical process of ultrahigh voltage alternating current transmission lines voltage x current transmission,
There is the ability of natural anti-capacitance current.The inventive method utilizes ultrahigh voltage alternating current transmission lines to protect
Three phase short circuit fault, the extra-high voltage at ultrahigh voltage alternating current transmission lines protection seting scope is there is in setting range
When transmission line of alternation current is properly functioning after voltage between phases leading ultrahigh voltage alternating current transmission lines three phase short circuit fault
The phase place corner of voltage between phases this characteristic in the range of (90 °-270 °) constitutes ultra-high voltage AC transmission line
Road three phase short circuit fault identical criterion, eliminates transition resistance, load current and power system operation mode etc.
The factor impact on Perfomance of protective relaying.
Accompanying drawing explanation
Fig. 1 is the extra-high voltage AC circuit transmission system schematic diagram of the application present invention.
Detailed description of the invention
Below according to Figure of description, technical scheme is expressed in further detail.
Fig. 1 is the extra-high voltage AC circuit transmission system schematic diagram of the application present invention.In Fig. 1, CVT is voltage
Transformer, CT are current transformer.
Ultrahigh voltage alternating current transmission lines three phase short circuit fault recognition methods, including following sequential steps:
(1) protection device electricity to the voltage transformer CVT of ultrahigh voltage alternating current transmission lines protection installation place
The current waveform of pressure summation current transformer CT carries out sampling and obtains voltage, current instantaneous value.
Voltage, current instantaneous value that sampling is obtained by protection device utilize Fourier algorithm to calculate extra-high-voltage alternating current
Three-phase voltage when transmission line of electricity is properly functioningAnd three-phase current
Wherein, φ α β=ABC, BCA, CAB phase.
(2) sampling is obtained by protection device voltage, current instantaneous value utilize Fourier algorithm calculating extra-high
Three-phase voltage after the three phase short circuit fault of pressure transmission line of alternation currentAnd three-phase current
Wherein, φ α β=ABC, BCA, CAB phase.
(3) protection device calculates l at ultrahigh voltage alternating current transmission lines protection seting scopesetThe extra-high voltage of point is handed over
α β voltage between phases after stream transmission line of electricity three phase short circuit fault
Wherein, Zc1For ultrahigh voltage alternating current transmission lines positive sequence natural impedance；γ1Pass for ultrahigh voltage alternating current transmission lines positive sequence
Broadcast coefficient；φ α β=ABC, BCA, CAB phase；Th (.) is hyperbolic tangent function；lsetFor ultra-high voltage AC transmission
Route protection setting range.
(4) protection device calculates l at ultrahigh voltage alternating current transmission lines protection seting scopesetThe extra-high voltage of point is handed over
α β voltage between phases when stream transmission line of electricity is properly functioning Wherein, Zc1For ultrahigh voltage alternating current transmission lines just
Sequence natural impedance；γ1For ultrahigh voltage alternating current transmission lines positive sequence propagation coefficient；φ α β=ABC, BCA, CAB phase；
Th (.) is hyperbolic tangent function；lsetFor ultrahigh voltage alternating current transmission lines protection seting scope.
(5) protection device calculatesLeadingPhase angle
If there is three phase short circuit fault, extra-high-voltage alternating current within the scope of ultrahigh voltage alternating current transmission lines protection seting
Voltage between phases when ultrahigh voltage alternating current transmission lines at line protection setting range is properly functioning
Voltage between phases after leading ultrahigh voltage alternating current transmission lines three phase short circuit faultPhase place corner at (90 °
270 °) in the range of.If there is three phase short circuit fault outside ultrahigh voltage alternating current transmission lines protection seting scope,
When ultrahigh voltage alternating current transmission lines at ultrahigh voltage alternating current transmission lines protection seting scope is properly functioning alternate
VoltageVoltage between phases after leading ultrahigh voltage alternating current transmission lines three phase short circuit faultPhase place
Corner is in the range of (-90 ° 90 °).This characteristic is utilized to propose ultrahigh voltage alternating current transmission lines three-phase shortcircuit
Fault Identification criterion is as follows:
(6) judgeLeadingPhase angleFall at (90 ° 270 °) model
Whether setting up in enclosing, if setting up, then in the range of judging ultrahigh voltage alternating current transmission lines protection seting, three-phase occurring
Short trouble, sends action trip signal, the three-phase breaker at tripping ultrahigh voltage alternating current transmission lines two ends.
The inventive method uses distributed constant modeling, accurately describes ultrahigh voltage alternating current transmission lines voltage x current and passes
Defeated physical process, has the ability of natural anti-capacitance current.The inventive method utilizes extra-high voltage to hand over
Three phase short circuit fault, ultrahigh voltage alternating current transmission lines protection seting is there is in stream line protection setting range
Voltage between phases leading ultrahigh voltage alternating current transmission lines when ultrahigh voltage alternating current transmission lines at scope is properly functioning
After three phase short circuit fault, the phase place corner of voltage between phases this characteristic in the range of (90 ° 270 °) constitutes spy
HVAC power transmission line three phase short circuit fault identical criterion, eliminates transition resistance, load current and electric power
The impact on Perfomance of protective relaying of the factors such as system operation mode.
The foregoing is only the preferred embodiment of the present invention, but protection scope of the present invention is not limited to
This, any those familiar with the art, in the technical scope that the invention discloses, can readily occur in
Change or replacement, all should contain within protection scope of the present invention.
Claims (1)
1. ultrahigh voltage alternating current transmission lines three phase short circuit fault recognition methods, it is characterised in that include
Following sequential steps:
(1) three-phase voltage when protector measuring ultrahigh voltage alternating current transmission lines is properly functioning And three-phase currentWherein, φ α β=ABC, BCA, CAB phase；
(2) three-phase voltage after protector measuring ultrahigh voltage alternating current transmission lines three phase short circuit faultAnd three-phase currentWherein, φ α β=ABC, BCA, CAB phase；
(3) protection device calculates l at ultrahigh voltage alternating current transmission lines protection seting scopesetThat puts is extra-high
α β voltage between phases after the three phase short circuit fault of pressure transmission line of alternation currentWherein, Zc1For ultrahigh voltage alternating current transmission lines positive sequence ripple
Impedance；γ1For ultrahigh voltage alternating current transmission lines positive sequence propagation coefficient；φ α β=ABC, BCA, CAB phase；
Th (.) is hyperbolic tangent function；lsetFor ultrahigh voltage alternating current transmission lines protection seting scope；
(4) protection device calculates l at ultrahigh voltage alternating current transmission lines protection seting scopesetThat puts is extra-high
α β voltage between phases when pressure transmission line of alternation current is properly functioning Wherein, Zc1For ultra-high voltage AC transmission line
Road positive sequence natural impedance；γ1For ultrahigh voltage alternating current transmission lines positive sequence propagation coefficient；φ α β=ABC, BCA,
CAB phase；Th (.) is hyperbolic tangent function；lsetFor ultrahigh voltage alternating current transmission lines protection seting scope；
(5) protection device calculatesLeadingPhase angle
(6) protection device judgesLeadingPhase angleFall (90
° 270 °) in the range of whether set up, if setting up, then judge that ultrahigh voltage alternating current transmission lines is protected whole
There is three phase short circuit fault in the range of Ding, send action trip signal, tripping ultra-high voltage AC transmission line
The three-phase breaker at two ends, road.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104852365B (en) * | 2015-05-15 | 2018-11-06 | 国家电网公司 | Based on single-end electrical quantity ultrahigh voltage alternating current transmission lines three phase short circuit fault method of discrimination |
| CN105203918A (en) * | 2015-09-14 | 2015-12-30 | 国网福建省电力有限公司 | Extra-high voltage alternating current transmission line three-phase short-circuit fault distance detection method based on single-ended electrical quantity |
| CN110780235B (en) * | 2019-11-12 | 2022-05-31 | 深圳供电局有限公司 | Disconnection fault identification method and system based on phase-to-phase voltage difference |
| CN110927621B (en) * | 2019-11-12 | 2022-12-27 | 上海宝钢工业技术服务有限公司 | Grounding detection positioning system for closed friction electric track of conveying chain |
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| JP2004343883A (en) * | 2003-05-15 | 2004-12-02 | Railway Technical Res Inst | Method and device for plotting earth fault point for magnetic floating system of railway |
| CN101614779A (en) * | 2008-12-30 | 2009-12-30 | 许继集团有限公司 | Differentiate the method for shunt reactor turn-to-turn short circuit, line to line fault and single-phase short circuit |
| CN103219713A (en) * | 2013-04-15 | 2013-07-24 | 国家电网公司 | Electric transmission line phase fault distance protecting method |
| CN103762569A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Two phrase grounding short circuit fault direction discriminating method of double circuit lines on the same tower |
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2014
- 2014-07-15 CN CN201410336575.0A patent/CN104076240B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004343883A (en) * | 2003-05-15 | 2004-12-02 | Railway Technical Res Inst | Method and device for plotting earth fault point for magnetic floating system of railway |
| CN101614779A (en) * | 2008-12-30 | 2009-12-30 | 许继集团有限公司 | Differentiate the method for shunt reactor turn-to-turn short circuit, line to line fault and single-phase short circuit |
| CN103219713A (en) * | 2013-04-15 | 2013-07-24 | 国家电网公司 | Electric transmission line phase fault distance protecting method |
| CN103762569A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Two phrase grounding short circuit fault direction discriminating method of double circuit lines on the same tower |
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| PB01 | Publication | ||
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Owner name: STATE GRID FUJIAN ELECTRIC POWER CO., LTD. MAINTEN Free format text: FORMER OWNER: STATE GRID FUJIAN ELECTRIC POWER CO., LTD. MAINTENANCE BRANCH COMPANY OF STATE GRID FUJIAN ELECTRIC POWER COMPANY Effective date: 20140928 |
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Inventor after: Zeng Huimin Inventor after: Lin Fuhong Inventor before: Zeng Huimin |
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Free format text: CORRECT: INVENTOR; FROM: CENG HUIMIN TO: CENG HUIMIN LIN FUHONG |
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Effective date of registration: 20140928 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Applicant after: STATE GRID FUJIAN MAINTENANCE Co. Applicant after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Applicant before: STATE GRID FUJIAN MAINTENANCE Co. |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Co-patentee after: STATE GRID FUJIAN MAINTENANCE Co. Co-patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee before: State Grid Corporation of China Co-patentee before: STATE GRID FUJIAN MAINTENANCE Co. Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. |
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Address after: 351100 Putian province Fujian city Chengxiang District Nanyuan Xia Lin Street Road No. 999 Co-patentee after: STATE GRID CORPORATION OF CHINA Patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Co-patentee after: STATE GRID FUJIAN MAINTENANCE Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee before: STATE GRID CORPORATION OF CHINA Co-patentee before: STATE GRID FUJIAN MAINTENANCE Co. Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. |