CN108110737B - 6-10kV isolated neutral system casing zero sequence optical differential protective relaying device - Google Patents
6-10kV isolated neutral system casing zero sequence optical differential protective relaying device Download PDFInfo
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- CN108110737B CN108110737B CN201711216343.1A CN201711216343A CN108110737B CN 108110737 B CN108110737 B CN 108110737B CN 201711216343 A CN201711216343 A CN 201711216343A CN 108110737 B CN108110737 B CN 108110737B
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- zero sequence
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- mutual inductor
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- phase
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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
Abstract
The invention discloses a kind of 6-10kV isolated neutral system casing zero sequence optical differential protective relaying devices, install casing zero sequence transformer additional in the gone out inlet wire cable of institute, distribution first order station to secondary station, compare to casing zero-sequence current, Judging fault.The design form, solve 6-10kV distribution first order station the purpose that quickly isolates to the gone out inlet wire cable singlephase earth fault of secondary station.
Description
Technical field
The invention belongs to breakdown judges, protection equipment in high voltage power transmission, and it is earth-free to be related to 6-10kV in power industry
The design of system canula zero sequence optical fiber differential protective.
Background technique
In 6-10KV isolated neutral system, in order to which fault point can be quickly isolated in system single-phase earthing, to 10KV
It feeds out interval two sides and has installed casing zero sequence current mutual inductor additional, and use the homopolar power of tripping in 0 second to 10KV terminal device
Direction protection.
The problem of in order to can solve the important circuit ground fault fast trips such as institute, 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 two sides is very high, also very high to the range of dynamic measurement requirement of its electric current, to zero
The transient characterisitics of sequence current transformer require also very high.The especially transient characterisitics of zero sequence current mutual inductor, to fault current
Aperiodic component is very sensitive.Therefore it needs to carry out logic programming to the technical solution that zero sequence current differential protection difference is protected.
Summary of the invention
The purpose of the present invention is to propose to a kind of 6-10kV isolated neutral system casing zero sequence optical differential protective relaying device, with
It is accurate to differentiate that institute, 6-10kV isolated neutral system first order station to cable run singlephase earth fault between secondary station, realizes isolated neutral system
Middle ground fault quickly isolates.
Technical solution of the present invention: a kind of 6-10kV isolated neutral system casing zero sequence optical differential protective relaying device,
First order station and secondary station between connecting cable phase current mutual inductor is installed, phase current mutual inductor is respectively close to first order station
Institute's cable socket is installed close to secondary station institute's cable socket, and the cable mounting sleeve zero-sequence current between phase current mutual inductor is 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
Sensor acquires single-phase-to-ground current in isolated neutral system, and carries out both ends comparison, realizes casing zero sequence differential protection function；It utilizes
The collected different branch difference of phase current mutual inductor is separate, is latched the differential guarantor of casing zero sequence when two-phase grounding fault occurs
Shield, to realize 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, and zero sequence differential protection must be through prolonging
When, to guarantee to be able to achieve cooperation in response speed between the two, operating criterion is as follows:
When phase CT is saturated, it is latched zero sequence differential protection
Wherein:I D0- casing zero sequence difference current,
I R0- casing zero-sequence braking electric current,
I 0Initiation value- casing zero-sequence current initiation value,
K This side- this side regulation coefficient,
I SUMThis sideThe vector sum of-this side three-phase current,
K Opposite side- opposite side regulation coefficient,
I SUMOpposite side-- the vector sum of opposite side three-phase current,
The zero-sequence current full scale value of this side casing zero sequence current mutual inductor of IM0max-,
IN0max-opposite side casing zero sequence current mutual inductor 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.
Detailed description of the invention
Fig. 1 is schematic diagram of the invention；
Wherein: institute, 1- first order station, institute, 2- secondary station, 3- connecting cable, 4- phase current mutual inductor, 5- casing zero-sequence current are mutual
Sensor, 6- protective relaying device, 7- optical fiber.
Specific embodiment
Such as figure, a kind of 6-10kV isolated neutral system casing zero sequence optical differential protective relaying device, in institute, distribution first order station 1
With distribution secondary station 6-10kV connecting cable 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, 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 acquires single-phase-to-ground current in isolated neutral system, and carries out both ends comparison, there is difference (setting model
Enclose) when, protective relaying device 6 is activated, the tripping of 6 control switch of protective relaying device achievees the effect that isolated fault route, realizes
Casing zero sequence differential protection function；It is separate using the collected different branch difference of phase current mutual inductor 4, it is short that two phase ground occurs
Casing zero sequence differential protection is latched when road, to realize casing zero sequence differential protection accurately sentencing to guard interval internal fault
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 when 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 self-produced zero-sequence current may also be saturated, 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 casing zero sequence current mutual inductor range of dynamic measurement (such as to no-load voltage ratio be 75/1, precision be 10P10 CT, move
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 are different, because
This is also different the reaction speed of failure.For the sake of reliable, casing zero sequence differential protection must be through small delay, to guarantee this
Cooperation is able to achieve in response speed between the two.
Operating criterion is as follows:
PhaseCTWhen saturation, it is latched zero sequence differential protection
Wherein:I D0- casing zero sequence difference current,
I R0- casing zero-sequence braking electric current,
I 0Initiation value- casing zero-sequence current initiation value,
K This side- this side regulation coefficient,
I This side SUM The vector sum of-this side three-phase current,
K Opposite side- opposite side regulation coefficient,
I SUMOpposite side-- the vector sum of opposite side three-phase current,
The zero-sequence current full scale value of this side casing zero sequence current mutual inductor of IM0max-,
IN0max-opposite side casing zero sequence current mutual inductor zero-sequence current full scale value.
Unlike general protection, IM0max, IN0max are that casing zero sequence current mutual inductor in two sides is guaranteeing progress of disease essence
Maximum allowable zero-sequence current under degree；And coefficientK This side、K Opposite sideNo-load voltage ratio between zero sequence current mutual inductor and phase current mutual inductor
Conversion coefficient.Criterion shows that the only self-produced zero-sequence current in route two sides is maximum no more than the casing zero sequence current mutual inductor of two sides
When allowing electric current, protection is just acted, and otherwise Zero sequence current differential protection will be blocked.Due to the magnetic of casing zero sequence current mutual inductor
Much longer than phase current mutual inductor in road, core area is also much smaller, therefore the overload capacity of casing zero sequence current mutual inductor compares phase
Current transformer is much smaller, and general overload capacity does not exceed 10 times；In addition, the load capacity of zero sequence current mutual inductor is poor, it is
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 set
Pipe CT.
Claims (1)
1. a kind of 6-10kV isolated neutral system casing zero sequence optical differential protective relaying device, in institute, first order station (1) and secondary station
Connecting cable (3) between institute (2) installs phase current mutual inductor (4), and phase current mutual inductor (4) is respectively close to institute, first order station
(1) cable socket, the cable mounting sleeve zero sequence between institute, secondary station (2) cable socket installation, phase current mutual inductor (4)
Current transformer (5), casing zero sequence current mutual inductor (5) are succeeded electrical protective device (6), and protective relaying device (6) passes through optical fiber
(7) connect；Casing zero sequence current mutual inductor (5) acquires single-phase-to-ground current in isolated neutral system, and carries out both ends comparison, realizes
Casing zero sequence differential protection function；It is separate using the collected different branch difference of phase current mutual inductor (4), two phase ground occurs
Casing zero sequence differential protection is latched when short-circuit, to realize casing zero sequence differential protection accurately sentencing to guard interval internal fault
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 being delayed,
To guarantee to be able to achieve cooperation in response speed between the two, operating criterion is as follows:
PhaseCTWhen saturation, it is latched zero sequence differential protection
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 SUM The vector sum of-this side three-phase current,
K Opposite side - opposite side regulation coefficient,
I The opposite side SUM -- the vector sum of opposite side three-phase current,
The zero-sequence current full scale value of this side casing zero sequence current mutual inductor of IM0max-,
IN0max-opposite side casing zero sequence current mutual inductor zero-sequence current full scale value.
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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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN108110737A CN108110737A (en) | 2018-06-01 |
| CN108110737B true CN108110737B (en) | 2019-06-25 |
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| CN112564056B (en) * | 2020-12-02 | 2022-11-25 | 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 |
| US7123459B2 (en) * | 2003-04-07 | 2006-10-17 | Schweitzer Engineering Laboratories, Inc. | Protective relay capable of protection applications without protection settings |
| CN105005014B (en) * | 2015-07-07 | 2017-11-21 | 南京国电南自电网自动化有限公司 | A kind of combining unit with protective current transformer output abnormality detection function |
| CN105529687B (en) * | 2016-01-28 | 2017-12-22 | 南京南瑞继保电气有限公司 | A kind of quick zero-sequencedirectional protection method of transformer |
| CN105552838B (en) * | 2016-02-26 | 2017-11-17 | 三峡大学 | Transformer zero-seguence differential protection algorithm based on the identification of standardized graphics similarity mode |
| CN106208000B (en) * | 2016-09-22 | 2019-03-19 | 南京国电南自电网自动化有限公司 | Multiphase CT saturation split-phase and door blocking method outside a kind of homodyne protection zone |
| CN106771804B (en) * | 2016-12-08 | 2018-11-23 | 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 |
| CN107317312B (en) * | 2017-06-20 | 2019-07-16 | 国网江苏省电力公司无锡供电公司 | A kind of the distribution network line differential protection and method of earthing mode self-identifying |
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