CN108054737B - A kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method - Google Patents
A kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method Download PDFInfo
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- CN108054737B CN108054737B CN201711291921.8A CN201711291921A CN108054737B CN 108054737 B CN108054737 B CN 108054737B CN 201711291921 A CN201711291921 A CN 201711291921A CN 108054737 B CN108054737 B CN 108054737B
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- string
- route
- asymmetric operation
- mends
- definite value
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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
Abstract
The invention discloses a kind of strings to mend asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method; include the following steps: the real-time acquisition system run signal of step 1, line protective devices, judges that the string whether system enters under this route non-failure conditions mends asymmetric operation state；Step 2, when differentiating that this route enters under non-failure conditions string and mends asymmetric operation state, line protective devices are automatically adjusted to adapt to the operating status zero sequence most latter end protection act definite value.It is preferred that line protective devices acquire this route protection action signal, the another set of route protection action signal of duplicate system retrofit, string in real time and mend protection signal and string benefit by-pass switch position signal in step 1.Without carrying out manual intervention, prevent string from causing route protection incorrect operation that route is caused accidentally to cut off when mending in asymmetric operation state, lifting system integrated automation performance and safety action performance.
Description
Technical field
The present invention relates to a kind of strings to mend asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method.
Background technique
With the super, fast development of extra-high voltage grid and the interconnection of regional power grid, long range large capacity EHV transmission
Route using increasingly extensive, in order to improve the conveying capacity of route, improve transmission of electricity quality, series capacitor compensation (string is mended) equipment
It is got a lot of applications in transmission line of electricity.When string is mended in asymmetric operation state, will occur in transmission line of electricity certain
The zero-sequence current of ratio, which may cause route protection standby zero-sequenceprotection movement, to cause whole route quilt
Accidentally cut off.Due to generally convey that load is higher and importance is also very high containing series compensated transmission line, malfunctioning can for system power supply
It is influenced by property very big.
Control is mended containing the line protective devices and string applied in series compensated transmission line at present to protect without information exchange,
Corresponding measure is taken in route protection abnormal operation behavior when not mending asymmetric operation for string.Therefore, it is highly desirable to study
Route protection adaptability solution when string mends asymmetric operation.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value adjust automatically
Method makes full use of system related information, solves the problems, such as the abnormal operation in the case of route protection malfunctions herein.
Name Resolution:
1, string mends asymmetric operation state: referring to that string benefit by-pass switch is not at three-phase whole closure or three-phase is all disconnected
The state symmetrical operation state opened.
2, zero sequence most latter end protection act definite value: multisection type zero-sequenceprotection is usually configured in route protection, this definite value is refered in particular to
According to the last section of zero-sequenceprotection for escaping load unbalanced formation zero-sequence current adjusting.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme:
A kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method, includes the following steps:
The real-time acquisition system run signal of step 1, line protective devices, judges whether system enters this route fault-free feelings
String under condition mends asymmetric operation state；
Step 2, when differentiating that this route enters under non-failure conditions string and mends asymmetric operation state, line protective devices from
It is dynamic that zero sequence most latter end protection act definite value is adjusted to adapt to the operating status.
It is preferred that in step 1, line protective devices acquire in real time this route protection action signal, duplicate system retrofit it is another
Cover route protection action signal, string mends protection signal and string mends by-pass switch position signal.
It is preferred that when this route protection is not operating, the another set of route protection of duplicate system retrofit is not operating, string is mended protection and do not moved
Make and string is when to mend a certain phase of by-pass switch be coincidence, differentiates that this route enters under non-failure conditions string and mends asymmetric operation state.
It is preferred that in step 2, if I0setFor zero sequence adjusted most latter end protection act definite value, then:
I0set=kI0_un
In formula, k is safety factor, I0_unThe maximum zero sequence current being likely to occur in the case of asymmetric operation is mended for string.
It is preferred that k value range is 1.05~1.2, for example, k value is 1.1.
The beneficial effects of the present invention are:
The present invention mends current operating conditions by integrated system relevant information identification string and adjust automatically protects definite value, is not necessarily to
Manual intervention is carried out, prevents string from causing route protection incorrect operation that route is caused accidentally to cut when mending in asymmetric operation state
It removes, lifting system integrated automation performance and safety action performance.
Detailed description of the invention
Fig. 1 is the logic chart that the present invention differentiates this route fault-free and string mends asymmetric operation state.
Specific embodiment
Technical solution of the present invention is described in further detail with specific embodiment with reference to the accompanying drawing, so that ability
The technical staff in domain can better understand the present invention and can be practiced, but illustrated embodiment is not as to limit of the invention
It is fixed.
A kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method, includes the following steps:
The real-time acquisition system run signal of step 1, line protective devices, judges whether system enters this route fault-free feelings
String under condition mends asymmetric operation state；
Step 2, when differentiating that this route enters under non-failure conditions string and mends asymmetric operation state, line protective devices from
It is dynamic that zero sequence most latter end protection act definite value is adjusted to adapt to the operating status.
As shown in Figure 1, it is preferable that in step 1, line protective devices acquire this route protection action signal, dual in real time
The another set of route protection action signal of configuration, string mend protection signal and string mends by-pass switch position signal.In summary
Whether signal line protection identifying system, which enters the string under this line non-failure conditions, is mended asymmetric operation state.With electric system
Intelligent development, the interconnection technology between relevant device is increasingly mature, and real-time, the reliability of signal transmitting can obtain
To being effectively ensured.Therefore, it makes full use of string to mend the coherent signal of control protection, identifies that current string mends asymmetric operation state, from
And adaptively improves route protection action performance and be possibly realized.
It is preferred that when this route protection is not operating, the another set of route protection of duplicate system retrofit is not operating, string is mended protection and do not moved
Make and string mends (this four conditions are all satisfied) when a certain phase of by-pass switch is coincidence, differentiates that this route enters under non-failure conditions
String mends asymmetric operation state, needs to adjust route standby zero-sequenceprotection definite value at this time, otherwise without adjustment.
It is preferred that in step 2, if I0setFor zero sequence adjusted most latter end protection act definite value, then:
I0set=kI0_un
In formula, k is safety factor, I0_unThe maximum zero sequence current being likely to occur in the case of asymmetric operation is mended for string.K's
Value range is 1.05~1.2, for example, k value is 1.1.
The present invention mends current operating conditions by integrated system relevant information identification string and adjust automatically protects definite value, is not necessarily to
Manual intervention is carried out, prevents string from causing route protection incorrect operation that route is caused accidentally to cut when mending in asymmetric operation state
It removes, lifting system integrated automation performance and safety action performance.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure made by bright specification and accompanying drawing content perhaps equivalent process transformation or be directly or indirectly used in other correlation
Technical field, be included within the scope of the present invention.
Claims (5)
1. a kind of string mends asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method, which is characterized in that including as follows
Step:
The real-time acquisition system run signal of step 1, line protective devices, judges whether system enters under this route non-failure conditions
String mend asymmetric operation state；The string benefit asymmetric operation state is not at three-phase including string benefit by-pass switch and all closes
It closes or all off state symmetrical operation state of three-phase；
Step 2, when differentiating that this route enters under non-failure conditions string and mends asymmetric operation state, line protective devices are automatically right
Zero sequence most latter end protection act definite value is adjusted to adapt to the operating status, if I0setFor the protection of zero sequence adjusted most latter end
Act definite value, then:
I0set=kI0_un
In formula, k is safety factor, I0_unThe maximum zero sequence current being likely to occur in the case of asymmetric operation is mended for string.
2. a kind of string according to claim 1 mends asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, in step 1, line protective devices acquire in real time this route protection action signal, duplicate system retrofit it is another set of
Route protection action signal, string mend protection signal and string mends by-pass switch position signal.
3. a kind of string according to claim 2 mends asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, when this route protection is not operating, duplicate system retrofit another set of route protection is not operating, string benefit protection is not operating
And string mends by-pass switch a certain phase when being coincidence, differentiates that this route enters under non-failure conditions string and mends asymmetric operation state.
4. a kind of string according to claim 1 mends asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, k value range is 1.05~1.2.
5. a kind of string according to claim 4 mends asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, k value is 1.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711291921.8A CN108054737B (en) | 2017-12-08 | 2017-12-08 | A kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711291921.8A CN108054737B (en) | 2017-12-08 | 2017-12-08 | A kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method |
Publications (2)
| Publication Number | Publication Date |
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| CN108054737A CN108054737A (en) | 2018-05-18 |
| CN108054737B true CN108054737B (en) | 2019-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711291921.8A Active CN108054737B (en) | 2017-12-08 | 2017-12-08 | A kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2656527B2 (en) * | 1988-01-30 | 1997-09-24 | 株式会社日立製作所 | Spot network relay |
| US7472026B2 (en) * | 2006-12-22 | 2008-12-30 | General Electric Company | Multi-ended fault location system |
| CN101662141B (en) * | 2009-08-31 | 2011-12-14 | 国电南京自动化股份有限公司 | Series capacitor compensation circuit distance protection method by combining phase-comparison relay |
| CN102545173B (en) * | 2012-01-10 | 2014-08-27 | 广东省电力调度中心 | Zero-sequence backup protection setting method for ultra-high voltage transmission line |
| CN102611083B (en) * | 2012-03-07 | 2014-06-25 | 广东电网公司东莞供电局 | Method for implementing adaptive zero sequence current network protection |
| CN103779845B (en) * | 2014-02-14 | 2017-03-08 | 华北电网有限公司 | A kind of method improving serial supplementary line current differential protection performance |
| CN104269848B (en) * | 2014-10-17 | 2016-07-06 | 国家电网公司 | A kind of string mends the control method for coordinating controlling protection with relay protection |
| CN105098986A (en) * | 2015-08-21 | 2015-11-25 | 上海毅昊自动化有限公司 | Relay protection device constant value online monitoring system and method thereof |
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