CN105655993B - A kind of current differential protection method using A Shi circle theorem - Google Patents
A kind of current differential protection method using A Shi circle theorem Download PDFInfo
- Publication number
- CN105655993B CN105655993B CN201610075239.4A CN201610075239A CN105655993B CN 105655993 B CN105655993 B CN 105655993B CN 201610075239 A CN201610075239 A CN 201610075239A CN 105655993 B CN105655993 B CN 105655993B
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- differential protection
- current differential
- current
- shi
- theorem
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of current differential protection methods using A Shi circle theorem, comprising: obtains the phasor of transmission line of electricity two sides three-phase currentWithCompareWithSize, whenWhen, it enablesWhenWhen, it enablesCurrent differential protection criterion is mapped on electric current complex plane；According to A Shi circle theorem, the position of adjustment movement circle obtains the current differential protection criterion on electric current complex plane, then be converted into phasor form.Technical solution of the present invention determines current differential protection actuating range using A Shi circle theorem; expand the range of the active region of current differential protection; when improving troubles inside the sample space, the sensitivity of current differential protection, while when not reducing external area error current differential protection reliability.
Description
Technical field
The present invention relates to relay protection fields, and in particular to a kind of current differential protection method using A Shi circle theorem.
Background technique
Current differential protection is widely answered in whole world power grid as the main protection of ultra-high/extra-high voltage transmission line of electricity
With.The current differential protection principle that route protection uses both at home and abroad at present, including the differential guarantor of steady-state quantity differential protection, Sudden Changing Rate
Shield, sampling value differential protection etc..Estimated current differential protection criterion mostly uses and poor criterion, changes electricity by adjusting restraint coefficient
The sensitivity of differential protection is flowed, but in heavy load situations, load current influences the braking amount of current differential protection, makes its spirit
Sensitivity reduces.
Summary of the invention
Method and electricity are determined using the current differential protection active region of A Shi circle theorem the object of the present invention is to provide a kind of
Differential protection criterion is flowed, the sensitivity of current differential protection when improving troubles inside the sample space, and the reliable of current differential protection is not reduced
Property.
To achieve the above object, the invention adopts the following technical scheme: a kind of current differential using A Shi circle theorem is protected
Maintaining method, comprising:
Acquire transmission line of electricity two sides respectively three-phase current sampled value, the phasor of computing electric power line two sides three-phase currentWithCompareWithSize, whenWhen, it enablesWhenWhen, it enables
Current differential protection criterion is mapped on electric current complex plane；Current differential protection criterion is mapped in electric current complex plane
On region are as follows:Wherein, λ is restraint coefficient, and k is adjustment factor.
The position that current differential protection movement circle is adjusted according to A Shi circle theorem, determines the actuating range of protection；
It is converted into the phasor form of current differential protection again.
WhenWhen, it is external area error；WhenWhen, it is single supply troubles inside the sample space.
The movement circle that current differential protection criterion is adjusted according to A Shi circle theorem, enables it surround the origin of electric current complex plane.
When k is 0.35, the current differential protection criterion on electric current complex plane is obtained
WhenWhen, the current differential protection criterion phasor form are as follows:
WhenWhen, the current differential protection criterion phasor form are as follows:
Compared with the nearest prior art, the technical scheme provide by that invention has the following excellent effect
1, technical solution of the present invention improves the active region of current differential protection；
2, when technical solution of the present invention improves troubles inside the sample space, the sensitivity of current differential protection, while not reducing outside area
The reliability protected when failure；
3, technical solution of the present invention is suitable for heavy-haul line.
Detailed description of the invention
Fig. 1 is operating space schematic diagram of the current differential protection in complex plane of the embodiment of the present invention；
Acting characteristic area schematic of the current differential protection in complex plane when Fig. 2 takes 0.35 for the K in Fig. 1.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment 1:
This example invents a kind of current differential protection method using A Shi circle theorem, comprising:
1) respectively three-phase current sampled value can be obtained using fourier algorithm calculating phasor for acquisition route two sides
2) compareWithSize, whenWhen, it enablesWhenWhen, it enables
3) acting characteristic of current differential protection is indicated on a complex plane；
4) K=0.35 is chosen.Obtaining the criterion of current differential protection on a complex plane is
5) whenWhen, it willIt is expressed as phasor shapeWhenWhen, it indicates are as follows:
Action performance compares:
Conventional current differential protection criterion are as follows:
For identical restraint coefficient λ, the current differential protection criterion actuating range that this patent proposes is larger, another party
Face, it is easier to improve the restraint coefficient λ of current differential protection.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field is although should be understood with reference to the above embodiments: still can be to a specific embodiment of the invention
It is modified or replaced equivalently, these are without departing from any modification of spirit and scope of the invention or equivalent replacement, at this
Within the claims of invention.
Claims (7)
1. a kind of current differential protection method using A Shi circle theorem, it is characterised in that: include:
The phasor of computing electric power line two sides three-phase currentWith
CompareWithSize；WhenWhen, it enablesWhenWhen, it enables
Current differential protection criterion is mapped on electric current complex plane；
The position that current differential protection movement circle is adjusted according to A Shi circle theorem, determines the actuating range of protection, then is converted
For the phasor form of current differential protection.
2. a kind of current differential protection method using A Shi circle theorem as described in claim 1, it is characterised in that: acquisition is defeated
The respective three-phase current sampled value in electric line two sides utilizes fourier algorithm to calculate the phasor of three-phase currentWith
3. a kind of current differential protection method using A Shi circle theorem as claimed in claim 1 or 2, it is characterised in that: electricity
Stream differential protection criterion is mapped in the region on electric current complex plane are as follows:Wherein, λ is restraint coefficient, and k is to adjust
Save coefficient.
4. a kind of current differential protection method using A Shi circle theorem as claimed in claim 3, it is characterised in that: whenWhen, it is external area error；WhenWhen, it is single supply troubles inside the sample space.
5. a kind of current differential protection method using A Shi circle theorem as described in claim 1, it is characterised in that: according to Ah
Family name's circle theorem adjusts the movement circle of current differential protection criterion, it is enabled to surround the origin of electric current complex plane.
6. a kind of current differential protection method using A Shi circle theorem as claimed in claim 3, it is characterised in that: when k is
When 0.35, the current differential protection criterion on electric current complex plane is obtained
7. a kind of current differential protection method using A Shi circle theorem as claimed in claim 6, it is characterised in that: whenWhen, the current differential protection criterion phasor form are as follows:WhenWhen,
The current differential protection criterion phasor form are as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610075239.4A CN105655993B (en) | 2016-02-03 | 2016-02-03 | A kind of current differential protection method using A Shi circle theorem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610075239.4A CN105655993B (en) | 2016-02-03 | 2016-02-03 | A kind of current differential protection method using A Shi circle theorem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105655993A CN105655993A (en) | 2016-06-08 |
| CN105655993B true CN105655993B (en) | 2019-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610075239.4A Active CN105655993B (en) | 2016-02-03 | 2016-02-03 | A kind of current differential protection method using A Shi circle theorem |
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| CN (1) | CN105655993B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193590A (en) * | 2018-10-22 | 2019-01-11 | 南京丰道电力科技有限公司 | A kind of power distribution network annular differential protecting method and device |
| CN109979288B (en) * | 2019-04-09 | 2024-02-13 | 九思教育科技有限公司 | Apollonis circle teaching device |
| CN114678845B (en) * | 2022-05-26 | 2022-08-02 | 国网山西省电力公司太原供电公司 | Calculation power differential protection method suitable for multi-source power distribution network |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100588066C (en) * | 2006-06-02 | 2010-02-03 | 北京四方继保自动化股份有限公司 | Method for realizing line differential protection based on long line equation |
| CN100459356C (en) * | 2006-06-16 | 2009-02-04 | 天津大学 | Split-phase current phase differential protecting method for extra-high voltage transmission line |
| CN103812094B (en) * | 2014-01-22 | 2016-06-22 | 华北电力大学 | The pilot protection system differential based on fault component virtual impedance and method thereof |
| CN104201658B (en) * | 2014-09-17 | 2018-01-19 | 国家电网公司 | A kind of differential guard method of transmission line of electricity based on virtual stalling current |
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| CN105655993A (en) | 2016-06-08 |
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