CN105846404B - Transmission line of electricity ground distance protection III segment protection methods - Google Patents
Transmission line of electricity ground distance protection III segment protection methods Download PDFInfo
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- CN105846404B CN105846404B CN201610186101.1A CN201610186101A CN105846404B CN 105846404 B CN105846404 B CN 105846404B CN 201610186101 A CN201610186101 A CN 201610186101A CN 105846404 B CN105846404 B CN 105846404B
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- earth fault
- phase
- protection
- transmission line
- distance protection
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- 230000004224 protection Effects 0.000 title claims abstract description 53
- 230000005540 biological transmission Effects 0.000 title claims abstract description 30
- 230000005611 electricity Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims abstract description 14
- 238000009434 installation Methods 0.000 claims abstract description 5
- 230000001012 protector Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 abstract description 10
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of transmission line of electricity ground distance protection III segment protection methods.The method of the present invention measures earth fault phase voltage, earth fault phase current, earth fault phase negative-sequence current and the zero-sequence current of line protection installation place first; it is grounded arc voltage phase using the phase calculation of earth fault phase negative-sequence current; the ground connection arc voltage amplitude of computing electric power line earth fault; then corresponding voltage magnitude variable quantity at earth fault before and after computing electric power line earth fault utilizes corresponding voltage magnitude variable quantity at earth fault to constitute III sections of Protection criterias of ground distance protection with transmission line of electricity specified phase voltage amplitude.The method of the present invention constitutes III sections of Protection criterias of transmission line of electricity ground distance protection using the ground connection arc voltage amplitude characteristic of transmission lines earth fault point; it is eliminated in principle because transition resistance causes influence of the additional impedance to III sections of Perfomance of protective relaying of ground distance protection; the ability influenced with very strong tolerance transition resistance and load current; ensure the correct action of III sections of protections of transmission line of electricity ground distance protection; it effectively prevent standby distance protection action to cause the big transfer of electric network swim, enhances safe operation of electric network stability.
Description
Technical field
The present invention relates to power system impedance distance protection technical fields, concretely relate to a kind of transmission line of electricity ground connection
Distance protection III segment protection methods.
Background technology
Traditional impedance ground distance protection measures fault impedance zrelayCalculating formula beDue to ThereforeI.e. traditional impedance ground away from
From protection fault impedance zrelayResult of calculation consist of two parts：A part hinders for the failure of reaction true fault distance
Anti- xz1, another part is the additional impedance caused by transition resistanceIn above-mentioned formula,For earth fault
Phase voltage；For earth fault voltage；For earth fault phase current；For zero-sequence current；φ is earth fault phase：A
Phase, B phases, C phases；z1For unit length electric transmission line positive sequence impedance；z0For unit length power transmission line zero-sequence impedance；RfFor transition
Resistance；It is earth fault to earth-current；X is fault distance of the line protection installation place to earth fault.
The additional impedance that transition resistance generates can cause the tripping or malfunction of impedance distance protection, relay fail that can make failure
It cannot be isolated in time with power grid, it is unfavorable to power grid operation；False protection then causes fault coverage to expand, and even results in power grid
The big transfer of trend, and then cause the generation of electric grid large area power cut accident.
Invention content
It can overcome because transition resistance causes it is an object of the present invention to overcome the deficiencies of the prior art, and to provide a kind of
The transmission line of electricity ground distance protection III segment protection methods that additional impedance influences impedance distance protection performance.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
Transmission line of electricity ground distance protection III segment protection methods, are characterized by, including following sequential steps：
(1) the earth fault phase voltage of protector measuring line protection installation placeEarth fault phase currentEarth fault phase negative-sequence currentAnd zero-sequence currentWherein, φ is earth fault phase：A phase, B phase, C phase；
(2) protective device utilizes earth fault phase negative-sequence currentPhase calculation be grounded arc voltage phase
(3) the ground connection arc voltage amplitude of protective device computing electric power line earth fault
Wherein,For earth fault phase voltage；For earth fault phase current；For zero-sequence current；For ground connection event
Hinder phase negative-sequence current；z1For unit length electric transmission line positive sequence impedance；z0For unit length power transmission line zero-sequence impedance；For earth fault phase voltageReal part；For earth fault phase voltageImaginary part；Imaginary part；For
Real part；
(4) corresponding voltage magnitude variable quantity at earth fault before and after protective device computing electric power line earth faultWherein,For transmission line of electricity specified phase voltage；
(5) protective device judgesIt is whether true, if so, then judge that III sections of ground distance protection is adjusted
Ground short circuit failure occurs in range, III sections of ground distance protection acts and sends out action trip signal.
The present invention compared with prior art, has following positive achievement：
The method of the present invention constitutes transmission line of electricity using the ground connection arc voltage amplitude characteristic of transmission lines earth fault point and connects
Distance protection III sections of Protection criterias in ground eliminate in principle because transition resistance causes additional impedance to III sections of ground distance protection
The influence of Perfomance of protective relaying has the ability that very strong tolerance transition resistance and load current influence, it is ensured that transmission line of electricity connects
The correct action of III sections of protections of ground distance protection effectively prevent standby distance protection action to cause the big transfer of electric network swim, enhancing electricity
Network operation security and stability.
Description of the drawings
Fig. 1 is the multi-line power transmission system schematic using the present invention.
The present invention is described further below in conjunction with the accompanying drawings.
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.Protector measuring line protection installation place
Earth fault phase voltageEarth fault phase currentEarth fault phase negative-sequence currentAnd zero-sequence currentWherein, φ
For earth fault phase：A phase, B phase, C phase.
Protective device utilizes earth fault phase negative-sequence currentPhase calculation be grounded arc voltage phase
The ground connection arc voltage amplitude of protective device computing electric power line earth fault
Wherein,For earth fault phase voltage；For earth fault phase current；For zero-sequence current；For ground connection event
Hinder phase negative-sequence current；z1For unit length electric transmission line positive sequence impedance；z0For unit length power transmission line zero-sequence impedance；For earth fault phase voltageReal part；For earth fault phase voltageImaginary part；ForImaginary part；For
Real part.
Corresponding voltage magnitude variable quantity at earth fault before and after protective device computing electric power line earth faultWherein,For transmission line of electricity specified phase voltage.
Protective device judgesIt is whether true, if so, then judge that III sections of ground distance protection adjusts model
Interior generation ground short circuit failure is enclosed, III sections of ground distance protection acts and sends out action trip signal.
The method of the present invention constitutes transmission line of electricity using the ground connection arc voltage amplitude characteristic of transmission lines earth fault point and connects
Distance protection III sections of Protection criterias in ground eliminate in principle because transition resistance causes additional impedance to III sections of protections of ground distance
The influence of performance, have it is very strong tolerance transition resistance and load current influence ability, it is ensured that transmission line of electricity ground connection away from
The correct action of III sections from protection protections effectively prevent standby distance protection action to cause the big transfer of electric network swim, enhancing power grid fortune
Row security and stability.
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. transmission line of electricity ground distance protection III segment protection methods, which is characterized in that including following sequential steps：
(1) the earth fault phase voltage of protector measuring line protection installation placeEarth fault phase currentIt connects
Earth fault phase negative-sequence currentAnd zero-sequence currentWherein, φ is earth fault phase：A phase, B phase, C phase；
(2) protective device utilizes earth fault phase negative-sequence currentPhase calculation be grounded arc voltage phase
(3) the ground connection arc voltage amplitude of protective device computing electric power line earth fault
Wherein,For earth fault phase voltage；For earth fault phase current；For zero-sequence current；It is mutually born for earth fault
Sequence electric current；z1For unit length electric transmission line positive sequence impedance；z0For unit length power transmission line zero-sequence impedance； For earth fault phase voltageReal part；For earth fault phase voltageImaginary part；ForImaginary part；For
Real part；
(4) corresponding voltage magnitude variable quantity at earth fault before and after protective device computing electric power line earth faultWherein,For transmission line of electricity specified phase voltage；
(5) protective device judgesIt is whether true, if so, then judge III sections of setting ranges of ground distance protection
Interior generation ground short circuit failure, III sections of ground distance protection act and send out action trip signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610186101.1A CN105846404B (en) | 2016-03-29 | 2016-03-29 | Transmission line of electricity ground distance protection III segment protection methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610186101.1A CN105846404B (en) | 2016-03-29 | 2016-03-29 | Transmission line of electricity ground distance protection III segment protection methods |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105846404A CN105846404A (en) | 2016-08-10 |
| CN105846404B true CN105846404B (en) | 2018-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610186101.1A Active CN105846404B (en) | 2016-03-29 | 2016-03-29 | Transmission line of electricity ground distance protection III segment protection methods |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646687B (en) * | 2019-09-05 | 2022-02-08 | 深圳供电局有限公司 | Distance protection setting value field calibration system and method for power grid transmission line |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094889A (en) * | 2013-01-31 | 2013-05-08 | 福建省电力有限公司 | Circuit single-phase earth fault impedance distance protection method based on additional impedance actual measurement correction |
| CN103795043A (en) * | 2014-02-24 | 2014-05-14 | 国家电网公司 | Overload maloperation-proof transmission line phase-to-phase fault backup protection method |
| CN103795044A (en) * | 2014-02-24 | 2014-05-14 | 国家电网公司 | Power transmission line phase-to-phase distance protection section III protection method |
| CN104078953A (en) * | 2014-07-16 | 2014-10-01 | 国家电网公司 | Power transmission line interphase arc light voltage protection method |
-
2016
- 2016-03-29 CN CN201610186101.1A patent/CN105846404B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094889A (en) * | 2013-01-31 | 2013-05-08 | 福建省电力有限公司 | Circuit single-phase earth fault impedance distance protection method based on additional impedance actual measurement correction |
| CN103795043A (en) * | 2014-02-24 | 2014-05-14 | 国家电网公司 | Overload maloperation-proof transmission line phase-to-phase fault backup protection method |
| CN103795044A (en) * | 2014-02-24 | 2014-05-14 | 国家电网公司 | Power transmission line phase-to-phase distance protection section III protection method |
| CN104078953A (en) * | 2014-07-16 | 2014-10-01 | 国家电网公司 | Power transmission line interphase arc light voltage protection method |
Non-Patent Citations (1)
| Title |
|---|
| 基于相间故障弧光电压特征的高压线路选相元件;许庆强 等;《电力系统自动化》;20060225;第30卷(第4期);第65-70、104页 * |
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| CN105846404A (en) | 2016-08-10 |
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