CN106300288B - A kind of station domain differential protecting method and device - Google Patents
A kind of station domain differential protecting method and device Download PDFInfo
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- CN106300288B CN106300288B CN201610736126.4A CN201610736126A CN106300288B CN 106300288 B CN106300288 B CN 106300288B CN 201610736126 A CN201610736126 A CN 201610736126A CN 106300288 B CN106300288 B CN 106300288B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005204 segregation Methods 0.000 claims abstract description 41
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- 230000002547 anomalous effect Effects 0.000 claims abstract description 28
- 238000009434 installation Methods 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 35
- 238000005070 sampling Methods 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 7
- 208000033748 Device issues Diseases 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000006855 networking Effects 0.000 description 4
- 241000272814 Anser sp. Species 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
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- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
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- 238000004590 computer program Methods 0.000 description 1
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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
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of station domain differential protecting method and devices, belong to field of relay protection in power.The station domain differential protecting method are as follows: the line segregation of composition station domain differential protection is sampled；When sampled data occurs abnormal, this side sampled data for switching anomalous line is opposite side sampled data, reformulates the major station domain differential protection that protection scope is extended to the opposite side installation place line current mutual inductor TA by opposite side sampled data；If broken down within the scope of the differential protection of major station domain, trip signal, the tripping route two sides breaker are simultaneously emitted by this side of the line segregation of sampled data exception and opposite side breaker.The method according to the invention; when line segregation sampled data exception; it only needs to expand station domain differential protection range, avoid the complex process for judging CT exception itself and because of differential protection tripping caused by CT abnormal obliteration differential protection, improves system reliability of operation.
Description
Technical field
The present invention relates to a kind of station domain differential protecting method and devices, belong to Relay Protection Technology in Power System field.
Background technique
With the continuous development and perfect, secondary device communication networkization gradually stable operation of intelligent substation technology.This
So that common network transmission may be implemented in whole station SV sample information, GOOSE information etc., full intelligent transformer substation information is reached and has maximized altogether
It enjoys, provides necessary condition for station domain differential protection.
Domain differential protection of standing be using whole transformer station as protected object, it is poor as conventional line differential protection and customary components
The back-up protection of dynamic protection, can make up the dead-zone fault tripping between conventional line differential protection and customary components differential protection
And complicated failure protection function is replaced, improve transformer substation system reliability of operation and sensitivity.
The various criterions that domain differential protection of standing uses are similar to conventional differential protection, and therefore, domain differential protection of standing also can be by
To the influence of CT exception.For example, in the case where CT breaks, it usually needs identified by sample information and identical criterion
CT broken string is identified as latch-up protection when CT broken string, is identified as open and protection when failure.Identify the identical criterion of CT exception itself very
It is more, such as Chinese patent literature " the protection side of CT asymmetry broken string quick lock bus that middle publication No. is CN103326329A
Method " discloses relevant CT asymmetry broken string identical criterion and judgment mode.
The defect of this existing station domain differential protection is: 1, identifying CT broken string etc. by sample information and identical criterion
CT abnormal conditions itself, criterion or judgment mode are often complex；2, it is identified as latch-up protection when CT exception itself, if closing
It breaks down, then can not be protected during lock, reduce the reliability of protection.
Summary of the invention
The purpose of the present invention is to provide a kind of station domain differential protecting method and devices, for solving the criterion of the prior art
Or the problem of judgment mode complexity.Further, additionally it is possible to solve the problems, such as that existing protected mode reliability is low.
To achieve the above object, a kind of station domain differential protecting method of the invention, steps are as follows: (1) detection composition station domain
The line segregation of differential protection is abnormal with the presence or absence of sampled data；(2) when the line segregation for detecting composition station domain differential protection
It is opposite side sampled data there are this side sampled data for when sampled data exception, switching anomalous line, by opposite side sampled data weight
New composition protection scope is extended to the major station domain differential protection of the opposite side installation place line current mutual inductor TA；(3) major station is executed
Domain differential protection: if broken down within the scope of the differential protection of the major station domain, this side and opposite side breaker to anomalous line
It is simultaneously emitted by trip signal, the tripping route two sides breaker.
Further, during executing major station domain differential protection, if without going out within the scope of the differential protection of the major station domain
Existing failure, then continue to execute major station domain differential protection, until anomalous line current transformer TA restores.
Further, after the breaker of tripping anomalous line two sides: if there are still failure in protection scope, to abnormal wire
The road interval all breakers on bus that are connected issue trip signal, all breakers on the tripping bus；If protecting model
Interior fault-free is enclosed, then continues to execute major station domain differential protection, until anomalous line current transformer TA restores.
Further, further includes: the low-voltage side capacitor of detection composition station domain differential protection is different with the presence or absence of sampled data
Normal step；
Abnormal if the low-voltage side capacitor interval sampling of station domain differential protection, switching subnormal pressure side bus up-samples number
According to the current transformer TA sampled data for low-pressure side transformer, reformulates protection scope and be contracted to low-pressure side transformer current
The step of small station domain differential protection of the installation place mutual inductor TA；
Small station domain differential protection is executed, until the step of subnormal pressure side capacitors are restored.
Further, include the steps that line segregation exception for identification or capacitor standoff are abnormal:
Line segregation and low-voltage side capacitor interval to the high, medium and low voltage side of composition station domain differential protection carry out different
Digital coding；
When sampled data exception occurs in a certain interval, parsed by the coding to the sampling interval, distinguishing is line
Road interval is abnormal or capacitor standoff is abnormal.
A kind of station domain differential protection of the invention, comprising: for detecting the line segregation of composition station domain differential protection
With the presence or absence of the unit of sampled data exception；For in the line segregation for detecting composition station domain differential protection, there are sampled datas
When abnormal, this side sampled data for switching anomalous line is opposite side sampled data, reformulates protection model by opposite side sampled data
Enclose the unit for being extended to the major station domain differential protection of the opposite side installation place line current mutual inductor TA；It is differential for executing major station domain
The unit of protection: if broken down in protection scope, this side and opposite side breaker to the line segregation of sampled data exception
It is simultaneously emitted by trip signal, the tripping route two sides breaker.
Further, in the unit for executing major station domain differential protection: if within the scope of the differential protection of the major station domain
It does not break down, then continues to execute major station domain differential protection, until anomalous line current transformer TA restores.
Further, further include for after the breaker of tripping two sides: if there are still failure in protection scope, to exception
The line segregation all breakers on bus that are connected issue trip signal, all breakers on the tripping bus；If protection
Fault-free in range then continues to execute major station domain differential protection, until the unit that anomalous line current transformer TA restores.
Further, further includes: for detecting the low-voltage side capacitor of composition station domain differential protection with the presence or absence of hits
According to abnormal unit；
Abnormal if the low-voltage side capacitor interval sampling of station domain differential protection, switching subnormal pressure side bus up-samples number
According to the current transformer TA sampled data for low-pressure side transformer, reformulates protection scope and be contracted to low-pressure side transformer current
The unit of the small station domain differential protection of the installation place mutual inductor TA；
For executing small station domain differential protection, until the unit that subnormal pressure side capacitors are restored.
Further, further include the unit of line segregation exception or capacitor standoff exception for identification:
Line segregation and low-voltage side capacitor interval to the high, medium and low voltage side of composition station domain differential protection carry out different
Digital coding；
When sampled data exception occurs in a certain interval, parsed by the coding to the sampling interval, distinguishing is line
Road interval is abnormal or capacitor standoff is abnormal.
The beneficial effects of the present invention are: using the solution of the present invention, by the detection to sampled data anomalous line interval,
The corresponding protection scope for expanding station domain differential protection, does not need to carry out any judgement, sentences so as to avoid conventional in the prior art
The complex process of disconnected CT exception itself.
Since technical solution of the present invention still uses major station domain differential protection mode in route interval sampling exception, and
Will not latch-up protection compensate for so that the protection in the case of ensure that line anomalies is run because sampled data causes accordingly extremely
The deficiency that conventional line differential protection and customary components differential protection are blocked.
Detailed description of the invention
Fig. 1 is the communication and protection system schematic that domain differential protection is related to of standing；
Fig. 2 is a kind of former station domain differential protection range schematic diagram of the embodiment 1 of domain differential protecting method of standing；
Fig. 3 is a kind of major station domain differential protection range schematic diagram of the embodiment 1 of domain differential protecting method of standing；
Fig. 4 is a kind of process flow diagram of the embodiment 2 of domain differential protecting method of standing；
Fig. 5 is a kind of former station domain differential protection range schematic diagram of the embodiment 2 of domain differential protecting method of standing；
Fig. 6 is a kind of major station domain differential protection range schematic diagram of the embodiment 2 of domain differential protecting method of standing；
Fig. 7 is a kind of small station domain differential protection range schematic diagram of the embodiment 2 of domain differential protecting method of standing.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
If Fig. 1 is the communication and protection system that station domain differential protection of the invention is related to, wherein showing sampling and jumping
Lock circuit.
This side line road acquisition unit gives collected data information transfer to this opposite side track data combining unit MU, opposite side
It is connected between conventional transmission line protection module and this opposite side track data combining unit MU by optical-fibre channel；This opposite side track data
Combining unit MU will pass to station domain networking interchanger after information processing；Main transformer high pressure side combining unit MU and main transformer low pressure
Connection type between side combining unit MU and station domain networking interchanger is identical as this opposite side track data combining unit MU.
Networking interchanger passes information to station domain differential protection module again.The station domain differential protection module is according to station domain
The information of networking interchanger transmitting provides different process instructions, and process instruction is successively transmitted, that is, sends tripping GOOSE
Instruct this opposite side track data combining unit MU, main transformer high pressure side combining unit MU and main transformer low-pressure side combining unit
MU.Tripping countermeasure GOOSE order is passed to opposite side conventional transmission line protection module by this opposite side track data combining unit MU.
A kind of station domain differential protecting method embodiment 1
Domain differential protecting method of standing includes the steps that following:
Step (1): the line segregation of detection composition station domain differential protection is abnormal with the presence or absence of sampled data；
Step (2): when the line segregation for detecting composition station domain differential protection is abnormal there are switching when sampled data exception
This side sampled data of route is opposite side sampled data, reformulates protection scope by opposite side sampled data and is extended to this to side line
The major station domain differential protection of the road installation place current transformer TA；
Step (3): after executing major station domain differential protection, if broken down in protection scope, 200ms is to hits for delay
Trip signal, the tripping route two sides breaker are simultaneously emitted by according to this side and opposite side breaker of abnormal line segregation.
2-3 is described further embodiment 1 with reference to the accompanying drawing:
As shown in Fig. 2, the range of former station domain differential protection, including high, medium and low voltage side line segregation, when detecting route
When interval sampling data exception, such as the current transformer TA5 sampled data of high-pressure side line segregation is abnormal, then switching the height
Pressure side current transformer TA5 sampled data is opposite side current transformer TA6 sampled data, by reverse phase treated current transformer
TA6 sampled data reformulates protection scope and is expanded to the major station domain differential protection of the installation place current transformer TA6 (due to normal
This side of route is opposite with the CT polarity of opposite side, so needing when CT sampling exception in this side is switched to opposite side CT sampled data
Reverse phase processing is carried out to opposite side sampled data), as shown in Figure 3.After executing major station domain differential protection, if gone out in protection scope
Existing failure, delay 200ms are sent out simultaneously to this side breaker 6DL and opposite side breaker 7DL of the line segregation of sampled data exception
Trip signal out, two sides the breaker 6DL and 7DL of the tripping line segregation.
In the present embodiment, when detecting line segregation sampled data exception, expand station domain differential protection range to exception
The major station domain differential protection of the line segregation opposite side installation place line current mutual inductor TA avoids routine and judges CT exception itself
Complex process.
A kind of station domain differential protecting method embodiment 2
A kind of station domain differential protecting method, detailed process is as shown in figure 4, step are as follows:
Step (1): the high, medium and low voltage side line segregation of detection composition station domain differential protection, low-voltage side capacitor interval are
It is no that there are sampled data exceptions；
Step (2): if there is exception, then further judgement is that line segregation sampling exception or low-voltage side capacitor are adopted
Sample is abnormal: sampling exception if line segregation, then carries out major station domain differential protection；Exception is sampled if low-voltage side capacitor, then
Small station domain differential protection is carried out, until subnormal pressure side capacitors are restored；
Step (3): after executing major station domain differential protection, if broken down in protection scope, 200ms is to hits for delay
Trip signal, the tripping route two sides breaker are simultaneously emitted by according to this side and opposite side breaker of abnormal line segregation.
During executing major station domain differential protection, if do not broken down within the scope of the differential protection of the major station domain,
Major station domain differential protection is continued to execute, until anomalous line current transformer TA restores.
After the breaker of tripping anomalous line two sides: if there are still failure in protection scope, be delayed 500ms to abnormal wire
The road interval all breakers on bus that are connected issue trip signal, all breakers on the tripping bus；If protecting model
Interior fault-free is enclosed, then continues to execute major station domain differential protection, until anomalous line current transformer TA restores.Above-mentioned delay time
Choose, can also choose different from 200ms, the value of 500ms, can by those skilled in the art according to station domain protection the characteristics of with
And demand is adjusted.
5-7 is further described station domain differential protecting method embodiment 2 with reference to the accompanying drawing:
As shown in figure 5, the range of former station domain differential protection, including high, medium and low voltage side line segregation and low-voltage side capacitor
Interval.
A kind of concrete mode of line segregation exception or capacitor standoff exception for identification are as follows:
Line segregation and low-voltage side capacitor interval to the high, medium and low voltage side of composition station domain differential protection carry out different
Digital coding, such as: coding by interval SV sampled data carry out 16 scale codings；
When sampled data exception occurs in a certain interval, parsed by the coding to the sampling interval, distinguishing is line
Road interval is abnormal or capacitor standoff is abnormal.
When detecting line segregation sampled data exception, such as the current transformer TA5 sampling of high-pressure side line segregation
Data exception, then will switch the high voltage side current mutual inductor TA5 sampled data is opposite side current transformer TA6 sampled data,
By reverse phase, treated that current transformer TA6 sampled data reformulates protection scope is expanded to the installation place current transformer TA6
Major station domain differential protection, as shown in Figure 6；After executing major station domain differential protection, if broken down in protection scope, to sampling
This side breaker 6DL and opposite side breaker 7DL of the line segregation of data exception are simultaneously emitted by trip signal, between the tripping route
Every two sides breaker 6DL and 7DL.
During executing major station domain as shown in FIG. 6 differential protection, if do not had within the scope of the differential protection of the major station domain
It breaks down, then continues to execute major station domain differential protection, until anomalous line current transformer TA5 restores.Due in fault-free
There is no latch-up protection in situation (i.e. CT itself is abnormal), so as to avoid the extremely caused corresponding conventional Line Differential of sampled data
The deficiency that protection and customary components differential protection are blocked, improves the reliability of substation operation.
When detecting low-voltage side capacitor C interval exception, switch low-pressure side bus up-sampling data as low-pressure side change
The current transformer TA3 sampled data of depressor reformulates protection scope and is contracted to low-pressure side transformer current mutual inductor TA3 peace
Small station domain differential protection at dress, as shown in fig. 7, until the interval low-voltage side capacitor C abnormal restoring.As it can be seen that the present embodiment is also
The situation of low-voltage side capacitor exception can be detected and be handled.
After tripping anomalous line two sides breaker 6DL and 7DL: if there are still failure in protection scope, to abnormal wire
Road interval is connected all breakers on bus, such as issues trip signal to 8DL, all breakers on the tripping bus；
If fault-free in protection scope, major station domain differential protection is continued to execute, until anomalous line current transformer TA5 restores.It can
See, when anomalous line interval is connected bus failure, also can guarantee the reliability service of substation.
A kind of station domain differential protection embodiment
A kind of station domain differential protection whether there is including the line segregation for detecting composition station domain differential protection and adopt
The unit of sample data exception；
For, there are when sampled data exception, switching anomalous line in the line segregation for detecting composition station domain differential protection
This side sampled data be opposite side sampled data, protection scope is reformulated by opposite side sampled data and is extended to the opposite side line electricity
The unit of the major station domain differential protection of the installation place current transformer TA；
For executing the unit of major station domain differential protection: if broken down in protection scope, abnormal to sampled data
This side of line segregation and opposite side breaker are simultaneously emitted by trip signal, the tripping route two sides breaker.Above-mentioned each unit is
Functional module corresponding with step (1) each in above method embodiment, (2), (3).Method of the invention is run on accordingly
Station domain differential protection in, all or part of the process in embodiment of the method is by computer program or computer
What program cooperated hardware to complete.Installation practice is a functional module construction corresponding with embodiment of the method.
Claims (8)
1. a kind of station domain differential protecting method, which is characterized in that steps are as follows:
1) line segregation of detection composition station domain differential protection is abnormal with the presence or absence of sampled data；
2) when detect composition station domain differential protection line segregation there are when sampled data exception, switch this side of anomalous line
Sampled data is opposite side sampled data, reformulates protection scope by opposite side sampled data and is extended to the opposite side line current mutual inductance
The major station domain differential protection of the installation place device TA；
3) major station domain differential protection is executed: if broken down within the scope of the differential protection of the major station domain, to the sheet of anomalous line
Side and opposite side breaker are simultaneously emitted by trip signal, the tripping route two sides breaker；
During executing major station domain differential protection, if do not broken down within the scope of the differential protection of the major station domain, continue
Major station domain differential protection is executed, until anomalous line current transformer TA restores.
2. a kind of station domain differential protecting method according to claim 1, which is characterized in that the open circuit of tripping anomalous line two sides
After device: if there are still failures in protection scope, issuing and jump to all breakers being connected on bus with anomalous line interval
Lock order, all breakers on the tripping bus；If fault-free in protection scope, major station domain differential protection is continued to execute,
Until anomalous line current transformer TA restores.
3. a kind of station domain differential protecting method according to claim 1 or 2, which is characterized in that further include:
The low-voltage side capacitor of detection composition station domain differential protection whether there is the step of sampled data exception；
Abnormal if the low-voltage side capacitor interval sampling of station domain differential protection, switching subnormal pressure side bus up-sampling data are
The current transformer TA sampled data of low-pressure side transformer reformulates protection scope and is contracted to low-pressure side transformer current mutual inductance
The step of small station domain differential protection of the installation place device TA；
Small station domain differential protection is executed, until the step of subnormal pressure side capacitors are restored.
4. a kind of station domain differential protecting method according to claim 3, which is characterized in that further include for identification between route
Every exception or the step of capacitor standoff exception:
Different digital codings is carried out to the line segregation and low-voltage side capacitor interval of composition station domain differential protection；
It when sampled data exception occurs in a certain interval, is parsed by the coding to the sampling interval, distinguishing is between route
It is abnormal every abnormal or capacitor standoff.
5. a kind of station domain differential protection characterized by comprising
Line segregation for detecting composition station domain differential protection whether there is the unit of sampled data exception；
For, there are when sampled data exception, switching the sheet of anomalous line in the line segregation for detecting composition station domain differential protection
Side sampled data is opposite side sampled data, and reformulating protection scope by opposite side sampled data, to be extended to the opposite side line current mutual
The unit of the major station domain differential protection of the installation place sensor TA；
For executing the unit of major station domain differential protection: if broken down in protection scope, to the route of sampled data exception
This side and opposite side breaker at interval are simultaneously emitted by trip signal, the tripping route two sides breaker；
In unit for executing major station domain differential protection: if do not broken down within the scope of the differential protection of the major station domain,
Major station domain differential protection is then continued to execute, until anomalous line current transformer TA restores.
6. a kind of station domain differential protection according to claim 5, which is characterized in that further include for tripping abnormal wire
After the breaker of road two sides: all disconnected on bus to being connected with anomalous line interval if there are still failures in protection scope
Road device issues trip signal, all breakers on the tripping bus；If fault-free in protection scope continues to execute major station domain
Differential protection, until the unit that anomalous line current transformer TA restores.
7. a kind of station domain differential protection according to claim 5 or 6, which is characterized in that further include:
Low-voltage side capacitor for detecting composition station domain differential protection whether there is the unit of sampled data exception；
Abnormal if the low-voltage side capacitor interval sampling of station domain differential protection, switching subnormal pressure side bus up-sampling data are
The current transformer TA sampled data of low-pressure side transformer reformulates protection scope and is contracted to low-pressure side transformer current mutual inductance
The unit of the small station domain differential protection of the installation place device TA；
For executing small station domain differential protection, until the unit that subnormal pressure side capacitors are restored.
8. a kind of station domain differential protection according to claim 7, which is characterized in that further include for identification between route
Every the unit of exception or capacitor standoff exception:
Different digital codings is carried out to the line segregation and low-voltage side capacitor interval of composition station domain differential protection；
It when sampled data exception occurs in a certain interval, is parsed by the coding to the sampling interval, distinguishing is between route
It is abnormal every abnormal or capacitor standoff.
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| CN201610736126.4A CN106300288B (en) | 2016-08-27 | 2016-08-27 | A kind of station domain differential protecting method and device |
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| CN201610736126.4A CN106300288B (en) | 2016-08-27 | 2016-08-27 | A kind of station domain differential protecting method and device |
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| CN106300288B true CN106300288B (en) | 2018-12-04 |
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| CN106849032B (en) * | 2017-04-11 | 2019-12-20 | 许继集团有限公司 | Station domain expansion differential protection method and system for coping with information loss |
| CN113013852B (en) * | 2021-02-26 | 2022-10-04 | 许继集团有限公司 | Line protection optical fiber channel transmission data processing method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102629754A (en) * | 2012-03-31 | 2012-08-08 | 积成电子股份有限公司 | Substation area back-up protecting method based on current differential principle |
| CN102916404A (en) * | 2011-12-27 | 2013-02-06 | 许继集团有限公司 | Differential protection method of regional power grid network change range |
| CN103401226A (en) * | 2013-08-09 | 2013-11-20 | 国网山东省电力公司潍坊供电公司 | Substation area differential protection method for intelligent substation |
| CN104810809A (en) * | 2015-04-21 | 2015-07-29 | 国家电网公司 | Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access |
-
2016
- 2016-08-27 CN CN201610736126.4A patent/CN106300288B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916404A (en) * | 2011-12-27 | 2013-02-06 | 许继集团有限公司 | Differential protection method of regional power grid network change range |
| CN102629754A (en) * | 2012-03-31 | 2012-08-08 | 积成电子股份有限公司 | Substation area back-up protecting method based on current differential principle |
| CN103401226A (en) * | 2013-08-09 | 2013-11-20 | 国网山东省电力公司潍坊供电公司 | Substation area differential protection method for intelligent substation |
| CN104810809A (en) * | 2015-04-21 | 2015-07-29 | 国家电网公司 | Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access |
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