CN108054737A - A kind of string mends asymmetric operation circuit standby zero-sequenceprotection definite value automatic adjusting method - Google Patents
A kind of string mends asymmetric operation circuit standby zero-sequenceprotection definite value automatic adjusting method Download PDFInfo
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- CN108054737A CN108054737A CN201711291921.8A CN201711291921A CN108054737A CN 108054737 A CN108054737 A CN 108054737A CN 201711291921 A CN201711291921 A CN 201711291921A CN 108054737 A CN108054737 A CN 108054737A
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- Prior art keywords
- string
- mends
- asymmetric operation
- definite value
- adjusting method
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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 circuit 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 that the string whether system enters under this circuit non-failure conditions mends asymmetric operation state；Step 2, when differentiating that this circuit enters under non-failure conditions string and mends asymmetric operation state, line protective devices are adjusted to adapt to the operating status to zero sequence most latter end protection act definite value automatically.It is preferred that in step 1, line protective devices gather this route protection actuating signal, the another set of route protection actuating signal of duplicate system retrofit, string and mend protection signal and string benefit by-pass switch position signal in real time.Manual intervention need not be carried out, causes route protection incorrect operation that circuit is caused to cut off by mistake when preventing string from 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 circuit standby zero-sequenceprotection definite value automatic adjusting method.
Background technology
With the super, fast development of extra-high voltage grid and the interconnection of regional power grid, long range large capacity EHV transmission
The application of circuit is increasingly extensive, in order to improve the conveying capacity of circuit, improves 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 appear from transmission line of electricity certain
The zero-sequence current of ratio, which may cause route protection standby zero-sequenceprotection to act, so as to cause whole circuit quilt
It cuts off by mistake.Generally convey that load is higher and importance is also very high due to containing series compensated transmission line, malfunctioning can for system power supply
It is influenced by property very big.
Control is mended with string containing the line protective devices 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.
The content of the invention
In view of the above-mentioned problems, the present invention, which provides a kind of string, mends asymmetric operation circuit standby zero-sequenceprotection definite value adjust automatically
Method makes full use of system related information, solve the problems, such as route protection malfunction herein in the case of abnormal operation.
Name Resolution：
1st, string mends asymmetric operation state：Finger string benefit by-pass switch is not at three-phase, and all closure or three-phase whole are disconnected
The state symmetrical operation state opened.
2nd, 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
The last section of zero-sequenceprotection adjusted according to load unbalanced formation zero-sequence current is escaped.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme：
A kind of string mends asymmetric operation circuit 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 circuit fault-free feelings
String under condition mends asymmetric operation state；
Step 2, when differentiating that this circuit 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 gather in real time this route protection actuating signal, duplicate system retrofit it is another
Cover route protection actuating 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 a certain phase of string benefit by-pass switch is when closing position, differentiate that this circuit enters string under non-failure conditions and mends asymmetric operation state.
It is preferred that in step 2, if I0setFor the most latter end protection act definite value of the zero sequence after adjustment, 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 ranges are 1.05~1.2, for example, k values are 1.1.
The beneficial effects of the invention are as follows：
The present invention identifies that string mends current operating conditions and adjust automatically protects definite value by integrated system relevant information, without
Manual intervention is carried out, causes route protection incorrect operation that circuit is caused to cut by mistake when preventing string from mending in asymmetric operation state
It removes, lifting system integrated automation performance and safety action performance.
Description of the drawings
Fig. 1 is the logic chart that the present invention differentiates this circuit fault-free and string mends asymmetric operation state.
Specific embodiment
Technical solution of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, so that ability
The technical staff in domain can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention
It is fixed.
A kind of string mends asymmetric operation circuit 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 circuit fault-free feelings
String under condition mends asymmetric operation state；
Step 2, when differentiating that this circuit 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 gather this route protection actuating signal, dual in real time
The another set of route protection actuating signal of configuration, string mend protection signal and string mends by-pass switch position signal.Summary
The string whether signal line protection identifying system enters under this line non-failure conditions mends asymmetric operation state.With electric system
Intelligent development, the technology that interconnects between relevant device is increasingly mature, and real-time that signal transfers, reliability can obtain
To being effectively ensured.Therefore, string is made full use of to mend the coherent signal of control protection, identifies that current string mends asymmetric operation state, from
And adaptively improve route protection 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 satisfied by) when a certain phase of by-pass switch is conjunction position, differentiate that this circuit enters under non-failure conditions
String mends asymmetric operation state, needs to adjust circuit standby zero-sequenceprotection definite value at this time, otherwise without adjustment.
It is preferred that in step 2, if I0setFor the most latter end protection act definite value of the zero sequence after adjustment, 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 values are 1.1.
The present invention identifies that string mends current operating conditions and adjust automatically protects definite value by integrated system relevant information, without
Manual intervention is carried out, causes route protection incorrect operation that circuit is caused to cut by mistake when preventing string from mending in asymmetric operation state
It removes, lifting system integrated automation performance and safety action performance.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure that bright specification and accompanying drawing content are made either equivalent process transformation or to be directly or indirectly used in other related
Technical field, be included within the scope of the present invention.
Claims (6)
1. a kind of string mends asymmetric operation circuit 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 circuit non-failure conditions
String mend asymmetric operation state；
Step 2, when differentiating that this circuit 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.
2. a kind of string according to claim 1 mends asymmetric operation circuit standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, in step 1, line protective devices gather in real time this route protection actuating signal, duplicate system retrofit it is another set of
Route protection actuating 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 circuit standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, when this route protection is not operating, the another set of route protection of duplicate system retrofit is not operating, string benefit protection is not operating
And it is when closing position that string, which mends a certain phase of by-pass switch, differentiates that this circuit enters string under non-failure conditions and mends asymmetric operation state.
4. a kind of string according to claim 3 mends asymmetric operation circuit standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, in step 2, if I0setFor the most latter end protection act definite value of the zero sequence after adjustment, 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.
5. a kind of string according to claim 4 mends asymmetric operation circuit standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, k value ranges are 1.05~1.2.
6. a kind of string according to claim 5 mends asymmetric operation circuit standby zero-sequenceprotection definite value automatic adjusting method,
It is characterized in that, k values are 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 |
|---|---|
| CN108054737A true CN108054737A (en) | 2018-05-18 |
| CN108054737B CN108054737B (en) | 2019-06-21 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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Citations (8)
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|---|---|---|---|---|
| JP2656527B2 (en) * | 1988-01-30 | 1997-09-24 | 株式会社日立製作所 | Spot network relay |
| US20080150544A1 (en) * | 2006-12-22 | 2008-06-26 | Premerlani William J | Multi-ended fault location system |
| CN101662141A (en) * | 2009-08-31 | 2010-03-03 | 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 |
| CN102545173A (en) * | 2012-01-10 | 2012-07-04 | 广东省电力调度中心 | Zero-sequence backup protection setting method for ultra-high voltage transmission line |
| CN102611083A (en) * | 2012-03-07 | 2012-07-25 | 广东电网公司东莞供电局 | Method for implementing adaptive zero sequence current network protection |
| CN103779845A (en) * | 2014-02-14 | 2014-05-07 | 华北电网有限公司 | Method for improving current differential protection motion performance of series compensated line |
| CN104269848A (en) * | 2014-10-17 | 2015-01-07 | 国家电网公司 | Coordination control method of series compensation control protection and 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 |
-
2017
- 2017-12-08 CN CN201711291921.8A patent/CN108054737B/en active Active
Patent Citations (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 |
| US20080150544A1 (en) * | 2006-12-22 | 2008-06-26 | Premerlani William J | Multi-ended fault location system |
| CN101662141A (en) * | 2009-08-31 | 2010-03-03 | 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 |
| CN102545173A (en) * | 2012-01-10 | 2012-07-04 | 广东省电力调度中心 | Zero-sequence backup protection setting method for ultra-high voltage transmission line |
| CN102611083A (en) * | 2012-03-07 | 2012-07-25 | 广东电网公司东莞供电局 | Method for implementing adaptive zero sequence current network protection |
| CN103779845A (en) * | 2014-02-14 | 2014-05-07 | 华北电网有限公司 | Method for improving current differential protection motion performance of series compensated line |
| CN104269848A (en) * | 2014-10-17 | 2015-01-07 | 国家电网公司 | Coordination control method of series compensation control protection and 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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| CN108054737B (en) | 2019-06-21 |
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