CN108110737A - 6-10kV isolated neutral system casing zero sequence optical differential protective relaying devices - Google Patents
6-10kV isolated neutral system casing zero sequence optical differential protective relaying devices Download PDFInfo
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- CN108110737A CN108110737A CN201711216343.1A CN201711216343A CN108110737A CN 108110737 A CN108110737 A CN 108110737A CN 201711216343 A CN201711216343 A CN 201711216343A CN 108110737 A CN108110737 A CN 108110737A
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- zero sequence
- casing
- current
- mutual inductor
- sequence
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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
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of 6 10kV isolated neutral system casing zero sequence optical differential protective relaying devices, go out inlet wire cable to secondary station in institute of distribution first order station and install casing zero sequence transformer additional, casing zero-sequence current are compared, Judging fault.The design form, solve 6 10kV distribution first order stations go out the purpose that inlet wire cable singlephase earth fault quickly isolates to secondary station.
Description
Technical field
The invention belongs to breakdown judge, protection equipment in high voltage power transmission, and it is earth-free to be related to 6-10kV in power industry
System canula zero sequence optical fiber differential protective designs.
Background technology
In 6-10KV isolated neutral systems, in order to which trouble point can be quickly isolated in system single-phase earthing, to 10KV
It feeds out interval both sides and has installed casing zero sequence current mutual inductor additional, and the homopolar power of tripping in 0 second is employed to 10KV terminal devices
Direction protection.
In order to solve the problems, such as the important circuit earth fault fast trips such as institute of first order station outgoing, intend important at these
The purpose of failure fast trip is grounded in circuit using zero sequence differential protection.Due to using zero sequence differential protection, to line
The coherence request of the zero sequence current mutual inductor of road both sides is very high, also very high to the range of dynamic measurement requirement of its electric current, to zero
The transient characterisitics requirement of sequence current transformer is also very high.The especially transient characterisitics of zero sequence current mutual inductor, to fault current
Aperiodic component is very sensitive.Therefore need to carry out logic programming to the technical solution of zero sequence current differential protection difference protection.
The content of the invention
The purpose of the present invention is to propose to a kind of 6-10kV isolated neutral systems casing zero sequence optical differential protective relaying device, with
It is accurate to differentiate that institute of 6-10kV isolated neutral systems first order station to cable run singlephase earth fault between secondary station, realizes isolated neutral system
Middle earth fault quickly isolates.
Technical scheme：A kind of 6-10kV isolated neutral systems casing zero sequence optical differential protective relaying device,
First order station and secondary station between connecting cable installation phase current mutual inductor, phase current mutual inductor is respectively close to first order station
Institute's cable socket, the cable mounting sleeve zero-sequence current between institute of secondary station cable socket installation, phase current mutual inductor are mutual
Sensor, casing zero sequence current mutual inductor succeed electrical protective device, and protective relaying device is connected by optical fiber；Casing zero-sequence current is mutual
Single-phase-to-ground current in sensor acquisition isolated neutral system, and both ends comparison is carried out, realize casing zero sequence differential protection function；It utilizes
The different branch difference that phase current mutual inductor collects is separate, and the differential guarantor of casing zero sequence is latched when two-phase grounding fault occurs
Shield, so as to fulfill casing zero sequence differential protection to the accurate judgement of guard interval internal fault；
Self-produced zero sequence overcurrent and casing zero sequence differential protection are different to the reaction speed of failure, zero sequence differential protection must through delay,
To ensure to realize cooperation in response speed between the two, operating criterion is as follows：
Wherein：I D0 - casing zero sequence difference current,
I R0 - casing zero-sequence braking electric current,
I 0 initiation value - casing zero-sequence current initiation value,
K This side - this side regulation coefficient,
I This side of SUM The vector sum of-offside three-phase current,
K Offside - offside regulation coefficient,
I SUM offsides -- the vector sum of offside three-phase current,
IM0max-this side zero-sequence current full scale value,
IN0max-offside zero-sequence current full scale value.
Beneficial effects of the present invention：It is accurate to differentiate cable run singlephase earth fault, it quickly isolates, safety and stability.
Description of the drawings
Fig. 1 is the schematic diagram of the present invention；
Wherein：Institute of 1- first order stations, institute of 2- secondary stations, 3- connecting cables, 4- phase current mutual inductors, 5- casing zero sequence current mutual inductances
Device, 6- protective relaying devices, 7- optical fiber.
Specific embodiment
Such as figure, a kind of 6-10kV isolated neutral systems casing zero sequence optical differential protective relaying device, in institute of distribution first order station 1
With distribution secondary station 6-10kV connecting cables 3 between 2 phase current mutual inductor 4 is installed, phase current mutual inductor 4 is respectively close
1 cable socket of first order station, the cable mounting sleeve zero between institute of secondary station 2 cable sockets installation, phase current mutual inductor 4
Sequence current transformer 5, casing zero sequence current mutual inductor 5 succeed electrical protective device 6, and protective relaying device 6 is connected by optical fiber 7；
Casing zero sequence current mutual inductor 5 gathers single-phase-to-ground current in isolated neutral system, and carries out both ends comparison, there is difference（Set model
It encloses）When, protective relaying device 6 is activated, protective relaying device 6 controls switch trip, achievees the effect that isolated fault circuit, realizes
Casing zero sequence differential protection function；The different branch difference collected using phase current mutual inductor 4 is separate, and it is short that two phase ground occurs
Casing zero sequence differential protection is latched during road, the accurate of guard interval internal fault is sentenced so as to fulfill casing zero sequence differential protection
It is disconnected.
Casing Zero sequence current differential protection is latched through phase current through self-produced zero sequence overcurrent, can solve different phases outside catchment
The differential malfunction problem of zero sequence during ground connection.When different mutually ground connection outside subordinate station institute generating region, casing zero sequence current mutual inductor must
Fixed serious saturation, although and saturation may also occur in self-produced zero-sequence current, the secondary current of output is still very big, therefore holds very much
Casing zero sequence differential protection is easily latched by the self-produced zero-sequence current of three-phase.The self-produced zero-sequence current locking definite value of three-phase should adjust
No more than the range of dynamic measurement of casing zero sequence current mutual inductor（Such as be 75/1 to no-load voltage ratio, precision is the CT of 10P10, is moved
State measurement range is 750A）.The program is in use, must take into account due to phase current mutual inductor and casing zero sequence current mutual inductor
No-load voltage ratio differ greatly, to same external area error, mutually self-produced zero-sequence current and the differential sensitivity of casing zero sequence be it is different, because
This is also different to the reaction speed of failure.For the sake of reliable, casing zero sequence differential protection must be through small delay, to ensure this
Between the two cooperation can be realized in response speed.
Operating criterion is as follows：
Wherein：I D0 - casing zero sequence difference current,
I R0 - casing zero-sequence braking electric current,
I 0 initiation value - casing zero-sequence current initiation value,
K This side - this side regulation coefficient,
I This side of SUM The vector sum of-offside three-phase current,
K Offside - offside regulation coefficient,
I SUM offsides -- the vector sum of offside three-phase current,
IM0max-this side zero-sequence current full scale value,
IN0max-offside zero-sequence current full scale value.
Unlike general protection, IM0max, IN0max are ensureing progress of disease essence for both sides casing zero sequence current mutual inductor
Maximum allowable zero-sequence current under degree；And this side of COEFFICIENT K, K offsides are between zero sequence current mutual inductor and phase current mutual inductor
No-load voltage ratio conversion coefficient.Criterion shows that only the self-produced zero-sequence current in circuit both sides is no more than the casing zero sequence current mutual inductor of both sides
During maximum allowed current, protection just acts, and otherwise Zero sequence current differential protection will be blocked.Due to casing zero sequence current mutual inductor
Much longer than phase current mutual inductor of magnetic circuit, core area is also much smaller, therefore the overload capacity of casing zero sequence current mutual inductor
More much smaller than phase current mutual inductor, general overload capacity does not exceed 10 times；In addition, the load capacity of zero sequence current mutual inductor
Difference, to improve its transient performance, secondary rated current should use 1A, it is general it is not recommended that using secondary rated current 5A zero
Sequence cannula C T.
Claims (1)
1. a kind of 6-10kV isolated neutral systems casing zero sequence optical differential protective relaying device, in institute of first order station（1）With secondary station
Institute（2）Between connecting cable（3）Phase current mutual inductor is installed（4）, phase current mutual inductor（4）Respectively close to institute of first order station
（1）Cable socket, institute of close secondary station（2）Cable socket is installed, phase current mutual inductor（4）Between cable mounting sleeve zero sequence
Current transformer（5）, casing zero sequence current mutual inductor（5）Succeed electrical protective device（6）, protective relaying device（6）Pass through optical fiber
（7）Connect；Casing zero sequence current mutual inductor（5）Single-phase-to-ground current in isolated neutral system is gathered, and carries out both ends comparison, is realized
Casing zero sequence differential protection function；Utilize phase current mutual inductor（4）The different branch difference collected is separate, and two phase ground occurs
Casing zero sequence differential protection is latched when short-circuit, the accurate of guard interval internal fault is sentenced so as to fulfill casing zero sequence differential protection
It is disconnected；
Self-produced zero sequence overcurrent and casing zero sequence differential protection are different to the reaction speed of failure, zero sequence differential protection must through delay,
To ensure to realize cooperation in response speed between the two, operating criterion is as follows：
Wherein：I D0 - casing zero sequence difference current,
I R0 - casing zero-sequence braking electric current,
I 0 initiation value - casing zero-sequence current initiation value,
K This side - this side regulation coefficient,
I This side of SUM The vector sum of-offside three-phase current,
K Offside - offside regulation coefficient,
I SUM offsides -- the vector sum of offside three-phase current,
IM0max-this side zero-sequence current full scale value,
IN0max-offside zero-sequence current full scale value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711216343.1A CN108110737B (en) | 2017-11-28 | 2017-11-28 | 6-10kV isolated neutral system casing zero sequence optical differential protective relaying device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711216343.1A CN108110737B (en) | 2017-11-28 | 2017-11-28 | 6-10kV isolated neutral system casing zero sequence optical differential protective relaying device |
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| Publication Number | Publication Date |
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| CN108110737A true CN108110737A (en) | 2018-06-01 |
| CN108110737B CN108110737B (en) | 2019-06-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564056A (en) * | 2020-12-02 | 2021-03-26 | 深圳供电局有限公司 | High-temperature superconducting cable fault protection system |
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| US6507184B1 (en) * | 2001-03-28 | 2003-01-14 | Abb Automation Inc. | Methods and apparatus for differential current measurement in a three-phase power system |
| US20040196603A1 (en) * | 2003-04-07 | 2004-10-07 | Schweitzer Edmund O. | Protective relay capable of protection applications without protection settings |
| CN105005014A (en) * | 2015-07-07 | 2015-10-28 | 南京国电南自电网自动化有限公司 | Merging unit with protection current transformer output abnormity detection function |
| CN105529687A (en) * | 2016-01-28 | 2016-04-27 | 南京南瑞继保电气有限公司 | Rapid zero-sequence overcurrent protection method for transformer |
| CN105552838A (en) * | 2016-02-26 | 2016-05-04 | 三峡大学 | Standardized graphic similarity matching identification-based zero-sequence differential protection algorithm for transformer |
| CN106208000A (en) * | 2016-09-22 | 2016-12-07 | 南京国电南自电网自动化有限公司 | The saturated split-phase of heterogeneous CT and door blocking method outside a kind of homodyne protection zone |
| CN106771804A (en) * | 2016-12-08 | 2017-05-31 | 南京南瑞继保电气有限公司 | A kind of transmission line of electricity broken string area judging method based on zero-sequence network |
| CN107317312A (en) * | 2017-06-20 | 2017-11-03 | 国网江苏省电力公司无锡供电公司 | The distribution network line differential protection and method of a kind of earthing mode self-identifying |
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2017
- 2017-11-28 CN CN201711216343.1A patent/CN108110737B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6507184B1 (en) * | 2001-03-28 | 2003-01-14 | Abb Automation Inc. | Methods and apparatus for differential current measurement in a three-phase power system |
| US20040196603A1 (en) * | 2003-04-07 | 2004-10-07 | Schweitzer Edmund O. | Protective relay capable of protection applications without protection settings |
| CN105005014A (en) * | 2015-07-07 | 2015-10-28 | 南京国电南自电网自动化有限公司 | Merging unit with protection current transformer output abnormity detection function |
| CN105529687A (en) * | 2016-01-28 | 2016-04-27 | 南京南瑞继保电气有限公司 | Rapid zero-sequence overcurrent protection method for transformer |
| CN105552838A (en) * | 2016-02-26 | 2016-05-04 | 三峡大学 | Standardized graphic similarity matching identification-based zero-sequence differential protection algorithm for transformer |
| CN106208000A (en) * | 2016-09-22 | 2016-12-07 | 南京国电南自电网自动化有限公司 | The saturated split-phase of heterogeneous CT and door blocking method outside a kind of homodyne protection zone |
| CN106771804A (en) * | 2016-12-08 | 2017-05-31 | 南京南瑞继保电气有限公司 | A kind of transmission line of electricity broken string area judging method based on zero-sequence network |
| CN107317312A (en) * | 2017-06-20 | 2017-11-03 | 国网江苏省电力公司无锡供电公司 | The distribution network line differential protection and method of a kind of earthing mode self-identifying |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564056A (en) * | 2020-12-02 | 2021-03-26 | 深圳供电局有限公司 | High-temperature superconducting cable fault protection system |
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| CN108110737B (en) | 2019-06-25 |
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