WO2015000227A1 - Bus protection method for quick locking in ct asymmetrical wire breakage - Google Patents
Bus protection method for quick locking in ct asymmetrical wire breakage Download PDFInfo
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- WO2015000227A1 WO2015000227A1 PCT/CN2013/084378 CN2013084378W WO2015000227A1 WO 2015000227 A1 WO2015000227 A1 WO 2015000227A1 CN 2013084378 W CN2013084378 W CN 2013084378W WO 2015000227 A1 WO2015000227 A1 WO 2015000227A1
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- current
- disconnection
- branch
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- wire breakage
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
Definitions
- the invention relates to the field of grid relay protection, in particular to a CT asymmetric disconnection fast blocking bus protection algorithm. Background technique
- CT disconnection for busbar protection is mostly asymmetric disconnection.
- the method for judging CT disconnection is that the busbar differential current is greater than the CT disconnection lockout value and a certain delay. The delay of this method takes about 5s, and the time is too long, which may cause the CT asymmetric disconnection to cause the bus differential protection to malfunction. Summary of the invention
- the technical problem to be solved by the present invention is to provide a protection method for a CT asymmetric disconnected quick-locking busbar, which can prevent the misoperation of the busbar differential protection when a CT asymmetric disconnection occurs without a large short-circuit current, When a large short-circuit current occurs, whether or not there is a CT asymmetric disconnection can ensure the correct operation of the bus differential protection.
- a method for protecting a CT asymmetric disconnected fast-locking bus bar comprising the following steps:
- the criterion for determining the occurrence of the CT disconnection by using the differential current to increase the brake current without change criterion is:
- Idctset is a threshold for non-large failure criteria. Recommended to take 0.6 IdO
- I rdlfctset the threshold for the sudden change in braking current for non-major fault criteria. It is recommended to take 0.3 «.
- the criterion for selecting the suspected disconnection branch criterion (which satisfies the no-flow criterion may be the CT disconnection branch) is:
- the criterion for the CT asymmetric disconnection confirmation criterion is:
- Iosum - the non-breaking branch has no zero-sequence current threshold. It is recommended to take 0.1 7 «.
- the CT asymmetric disconnection fast-locking busbar protection method includes the following steps:
- the criterion for judging the occurrence of CT disconnection by using the differential current to increase the brake current without change criterion is: ⁇ ⁇ ⁇ ⁇ ⁇ phase braking current change amount fctset - non-major fault criterion brake current sudden change criterion threshold. Recommended to take 0.3 « ;
- CT asymmetric disconnection The typical difference between CT asymmetric disconnection and busbar asymmetry fault is whether the brake current increases. If it increases, it will cause asymmetric fault. Otherwise, CT asymmetric disconnection may occur. 103. According to each line branch There is a current to select a suspected CT disconnection branch, and if there is no suspicious CT disconnection branch, open differential protection;
- the criterion for selecting the suspected disconnection branch criterion (satisfying the no-flow criterion may be the CT disconnection branch) is: I ⁇ I
- Icurex 1S t - CT disconnected phase current has a flow threshold. Recommended to take 0.15"
- the criterion for the CT asymmetric disconnection confirmation criterion is:
- I 0i - branch zero sequence current Iosum - the non-breaking branch has no zero-sequence current threshold. It is recommended to take 0.1 7 «.
Abstract
A bus protection method for quick locking in CT asymmetrical wire breakage. The method comprises: calculating electrical quantities such as a differential current, a brake current, a sudden-change current of each branch, and a zero-sequence current; determining whether a CT wire breakage occurs on a basis that a differential current increases while a brake current is unchanged, and yes not, starting differential protection; selecting a suspected CT wire breakage branch on a basis that whether a current exits in a branch of each circuit, and if there is no suspected CT wire breakage branch, starting differential protection; and determining the CT wire breakage according to information about sudden-change currents and zero-sequence currents of other branches except the suspected CT wire breakage branch, and if the CT wire breakage cannot be determined, starting differential protection. The present invention can prevent a false action of bus differential protection in a case in which a CT asymmetrical wire breakage occurs but there is no high short-circuit current, and ensure a correct action of bus differential protection no matter whether the CT asymmetrical wire breakage occurs when there is a high short-circuit current.
Description
说 明 书 Description
CT不对称断线快速闭锁母线的保护方法 技术领域 Method for protecting CT asymmetric disconnection fast locking busbar
本发明涉及电网继电保护领域，尤其是一种 CT不对称断线快速闭锁母 线保护算法。 背景技术 The invention relates to the field of grid relay protection, in particular to a CT asymmetric disconnection fast blocking bus protection algorithm. Background technique
目前用于母线保护的 CT断线多为不对称断线， 用于判断 CT断线的方 法为母线差电流大于 CT 断线闭锁定值且经过一定延时。 此方法延时需要 5s左右， 时间太长， 可能导致 CT不对称断线导致母线差动保护误动作。 发明内容 At present, CT disconnection for busbar protection is mostly asymmetric disconnection. The method for judging CT disconnection is that the busbar differential current is greater than the CT disconnection lockout value and a certain delay. The delay of this method takes about 5s, and the time is too long, which may cause the CT asymmetric disconnection to cause the bus differential protection to malfunction. Summary of the invention
本发明要解决的技术问题是：提供一种 CT不对称断线快速闭锁母线的 保护方法，可以防止在发生 CT不对称断线而又没有大短路电流时母线差动 保护的误动， 同时在发生大短路电流时不能是否有 CT不对称断线均可保证 母线差动保护的正确动作。 The technical problem to be solved by the present invention is to provide a protection method for a CT asymmetric disconnected quick-locking busbar, which can prevent the misoperation of the busbar differential protection when a CT asymmetric disconnection occurs without a large short-circuit current, When a large short-circuit current occurs, whether or not there is a CT asymmetric disconnection can ensure the correct operation of the bus differential protection.
为解决上述技术问题， 本发明的技术方案是： 一种 CT不对称断线快 速闭锁母线的保护方法， 包括以下步骤： In order to solve the above technical problem, the technical solution of the present invention is: A method for protecting a CT asymmetric disconnected fast-locking bus bar, comprising the following steps:
( 1 ) 计算出差流、 制动电流、 各支路电流突变量及零序电流等电气量； (1) Calculate the electrical quantities such as the differential current, the braking current, the sudden change in the current of each branch, and the zero-sequence current;
(2)以差流增加制动电流无变化判据来判断有 CT断线的发生,如果没有则 开放差动保护； (2) Judging that there is a CT disconnection by increasing the brake current without change criterion, and if not, opening the differential protection;
(3 )按各线路支路是否存在电流选出疑似 CT断线支路，如果没有可疑 CT
Δ断线支路则开放差动保护； (3) Selecting a suspected CT disconnection branch according to whether there is current in each line branch, if there is no suspicious CT The delta breaking branch is open differential protection;
(4) 根据除疑似 CT断线支路外的其他支路的电流突变量及零序电流信息 确认 CT断线， 如果不能确定 CT断线则开放差动保护。 (4) Confirm the CT disconnection according to the sudden current and zero sequence current information of the other branches except the suspected CT disconnected branch. If the CT disconnection cannot be determined, the differential protection is opened.
作为改进， 所述步骤（2) 中， 以差流增加制动电流无变化判据来判断 有 CT断线的发生的判据式为： As an improvement, in the step (2), the criterion for determining the occurrence of the CT disconnection by using the differential current to increase the brake current without change criterion is:
「 < I " < I
Ι φά—— Φ相差流 Ι φ ά —— Φ phase difference flow
Idctset一一非大故障判据差流判据门槛。 推荐取 0.6 IdO Idctset is a threshold for non-large failure criteria. Recommended to take 0.6 IdO
Δ ΙΦΓ—— Φ相制动电流变化量 Δ Ι ΦΓ —— Φ phase braking current change
Irdlfctset——非大故障判据制动电流突变量判据门槛。 推荐取 0.3 «。 I rdlfctset - the threshold for the sudden change in braking current for non-major fault criteria. It is recommended to take 0.3 «.
作为改进， 所述步骤（3 ) 中， 选疑似断线支路判据 （满足无流判据可 能为 CT断线支路） 的判据式为： 〈 As an improvement, in the step (3), the criterion for selecting the suspected disconnection branch criterion (which satisfies the no-flow criterion may be the CT disconnection branch) is:
Ij—相电流 （有名值） Ij—phase current (named value)
Icurexist— CT断线相电流有流判据门槛。 推荐取 0.157« I curexist — CT disconnected phase current has a flow threshold. Recommended to take 0.15 7 «
Icurno—— CT断线相电流无流判据门槛。 推荐取 0.08 «。 Icurno - CT disconnected phase current without flow threshold. It is recommended to take 0.08 «.
作为改进， 所述步骤 （4) 中， CT不对称断线确认判据的判据式为： As an improvement, in the step (4), the criterion for the CT asymmetric disconnection confirmation criterion is:
+ I + I
+ 由式 （2) 选出的断线支路 + disconnected branch selected by equation (2)
一支路相电流突变量
IdlfsUm——非断线支路无电流突变量判据门槛。 推荐取 0.1 « a phase current sudden change I dl fs Um - the threshold of the non-broken branch no-current mutation criterion. Recommended to take 0.1 «
I0J——支路零序电流 I 0J - branch zero sequence current
Iosum——非断线支路无零序电流判据门槛。 推荐取 0.1 7«。 Iosum - the non-breaking branch has no zero-sequence current threshold. It is recommended to take 0.1 7 «.
本发明与现有技术相比所带来的有益效果是： The beneficial effects of the present invention compared to the prior art are:
可以防止在发生 CT 不对称断线而又没有大短路电流时母线差动保护 的误动， 同时在发生大短路电流时不能是否有 CT不对称断线均可保证母线 差动保护的正确动作。 附图说明 It can prevent the misoperation of the bus differential protection when the CT asymmetrical disconnection occurs without large short-circuit current, and the correct operation of the bus differential protection can be ensured if there is no CT asymmetric disconnection when a large short-circuit current occurs. DRAWINGS
图 1是本发明 CT不对称断线快速闭锁母线保护算法流程图。 具体实施方式 1 is a flow chart of the CT asymmetric disconnection fast blocking busbar protection algorithm of the present invention. detailed description
下面结合说明书附图对本发明作进一步说明。 The invention will now be further described with reference to the drawings of the specification.
如图 1所示， CT不对称断线快速闭锁母线的保护方法， 其包括以下 步骤： As shown in Figure 1, the CT asymmetric disconnection fast-locking busbar protection method includes the following steps:
101、计算出差流、制动电流、各支路电流突变量及零序电流等电气量; 101. Calculate electrical quantities such as differential current, braking current, sudden change in current of each branch, and zero sequence current;
102、以差流增加制动电流无变化判据来判断有 CT断线的发生，如果没 有则开放差动保护； 102. Determine whether there is a CT disconnection by using a differential current to increase the brake current without change criterion, and if not, open the differential protection;
以差流增加制动电流无变化判据来判断有 CT断线的发生的判据式为：
Δ ΙΦΓ ~ Φ相制动电流变化量 fctset—非大故障判据制动电流突变量判据门槛。 推荐取 0.3 « ; The criterion for judging the occurrence of CT disconnection by using the differential current to increase the brake current without change criterion is: Δ Ι ΦΓ ~ Φ phase braking current change amount fctset - non-major fault criterion brake current sudden change criterion threshold. Recommended to take 0.3 « ;
CT不对称断线和母线轻微不对称故障的典型区别在于制动电流是否有 增大， 如果增大则为发生不对称故障， 否则可能发生 CT不对称断线； 103、 按各线路支路是否存在电流选出疑似 CT断线支路， 如果没有可 疑 CT断线支路则开放差动保护； The typical difference between CT asymmetric disconnection and busbar asymmetry fault is whether the brake current increases. If it increases, it will cause asymmetric fault. Otherwise, CT asymmetric disconnection may occur. 103. According to each line branch There is a current to select a suspected CT disconnection branch, and if there is no suspicious CT disconnection branch, open differential protection;
选疑似断线支路判据 （满足无流判据可能为 CT断线支路） 的判据式 为： I < I The criterion for selecting the suspected disconnection branch criterion (satisfying the no-flow criterion may be the CT disconnection branch) is: I < I
Ij——相电流 （有名值） Ij - phase current (named value)
Icurex1St—— CT断线相电流有流判据门槛。 推荐取 0.15 " Icurex 1S t - CT disconnected phase current has a flow threshold. Recommended to take 0.15"
Icurno—— CT断线相电流无流判据门槛。 推荐取 0.08 "； Icurno - CT disconnected phase current without flow threshold. Recommended to take 0.08";
104、 根据除疑似 CT断线支路外的其他支路的电流突变量及零序电流 信息确认 CT断线， 如果不能确定 CT断线则开放差动保护； 104. Confirm the CT disconnection according to the sudden change of current and the zero sequence current information of other branches except the suspected CT disconnection branch, and open the differential protection if the CT disconnection cannot be determined;
CT不对称断线确认判据的判据式为： The criterion for the CT asymmetric disconnection confirmation criterion is:
Υ ΑΙ . + V Δ/ - < i ,f Υ ΑΙ . + V Δ/ - < i , f
K "一由式 （2 ) 选出的断线支路 K "The disconnected branch selected by equation (2)
Δ ¾—支路相电流突变量 Δ 3⁄4 - branch phase current sudden change
IdlfsUm——非断线支路无电流突变量判据门槛。 推荐取 0.1 « I dl fs Um - the threshold of the non-broken branch no-current mutation criterion. Recommended to take 0.1 «
I0i——支路零序电流
Iosum——非断线支路无零序电流判据门槛。 推荐取 0.1 7«。 I 0i - branch zero sequence current Iosum - the non-breaking branch has no zero-sequence current threshold. It is recommended to take 0.1 7 «.
以上是对本发明的较佳实施进行了具体说明， 但本发明创造并不限于 所述实施例， 熟悉本领域的技术人员在不违背本发明精神的前提下还可做 作出种种的等同变形或替换， 这些等同的变形或替换均包含在本申请权利 要求所限定的范围内。
The above is a detailed description of the preferred embodiments of the present invention, but the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the invention. And such equivalent modifications or substitutions are intended to be included within the scope of the appended claims.
Claims
1. 一种 CT不对称断线快速闭锁母线的保护方法， 其特征在于， 包括以下 步骤： A method for protecting a CT asymmetric disconnected quick-locking busbar, characterized in that it comprises the following steps:
( 1 ) 计算出差流、 制动电流、 各支路电流突变量及零序电流等电气量； (1) Calculate the electrical quantities such as the differential current, the braking current, the sudden change in the current of each branch, and the zero-sequence current;
(2 )以差流增加制动电流无变化判据来判断有 CT断线的发生,如果没有则 开放差动保护； (2) judging that there is a CT disconnection by increasing the brake current without change criterion, and if not, opening the differential protection;
( 3 )按各线路支路是否存在电流选出疑似 CT断线支路，如果没有可疑 CT 断线支路则开放差动保护； (3) Selecting a suspected CT disconnection branch according to whether there is current in each line branch, and if there is no suspicious CT disconnection branch, open differential protection;
(4 ) 根据除疑似 CT断线支路外的其他支路的电流突变量及零序电流信息 确认 CT断线， 如果不能确定 CT断线则开放差动保护。 (4) Confirm the CT disconnection according to the sudden current and zero sequence current information of other branches except the suspected CT disconnected branch. If the CT disconnection cannot be determined, the differential protection is opened.
2. 根据权利要求 1所述的 CT不对称断线快速闭锁母线的保护方法， 其特 征在于： 所述步骤 （2 ) 中， 以差流增加制动电流无变化判据来判断有 CT断线的发生的判据式为： < I 2. The method for protecting a CT asymmetric disconnection quick-locking busbar according to claim 1, wherein: in the step (2), determining that there is a CT disconnection by using a differential current to increase the brake current without change criterion The criterion for the occurrence is: < I
Ιφά—— Φ相差流 Ιφ ά —— Φ phase difference flow
Idctset—非大故障判据差流判据门槛。 推荐取 0.6 IdO Idctset - the threshold for non-major fault criteria. Recommended to take 0.6 IdO
Δ ΙΦΓ—— Φ相制动电流变化量Δ Ι ΦΓ —— Φ phase braking current change
fctset——非大故障判据制动电流突变量判据门槛。 推荐取 0.3 «。 Fctset - the threshold for the non-major fault criterion brake current sudden change. It is recommended to take 0.3 «.
3. 根据权利要求 1所述的 CT不对称断线快速闭锁母线的保护方法， 其特 征在于： 所述步骤 （3 ) 中， 选疑似断线支路判据 （满足无流判据可能 为 CT断线支路） 的判据式为：
3. The method for protecting a CT asymmetric disconnected quick-locking busbar according to claim 1, wherein: in the step (3), selecting a suspected disconnection branch criterion (satisfying the no-flow criterion may be CT) The criterion for the broken branch is:
——相电流 （有名值） ——phase current (name value)
Lcurexist -CT断线相电流有流判据门槛。 推荐取 0.15 « The L curexist -CT disconnected phase current has a flow threshold. Recommended to take 0.15 «
-CT断线相电流无流判据门槛。 推荐取 0.08 -CT disconnected phase current has no flow criterion threshold. Recommended to take 0.08
4. 根据权利要求 1所述的 CT不对称断线快速闭锁母线的保护方法， 其特 征在于： 所述歩骤 （4) 中， CT不对称断线确认判据的判据式为：
4. The method for protecting a CT asymmetric disconnection quick-locking busbar according to claim 1, wherein: in the step (4), the criterion for the CT asymmetric disconnection confirmation criterion is:
K "一由式 （2) 选出的断线支路
K "One line (2) selected broken line branch
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310280376.8A CN103326329B (en) | 2013-07-04 | 2013-07-04 | The guard method of CT asymmetric broken string quick lock bus |
| CN201310280376.8 | 2013-07-04 |
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| WO2015000227A1 true WO2015000227A1 (en) | 2015-01-08 |
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| PCT/CN2013/084378 WO2015000227A1 (en) | 2013-07-04 | 2013-09-27 | Bus protection method for quick locking in ct asymmetrical wire breakage |
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| CN (1) | CN103326329B (en) |
| WO (1) | WO2015000227A1 (en) |
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| US9779556B1 (en) | 2006-12-27 | 2017-10-03 | Stamps.Com Inc. | System and method for identifying and preventing on-line fraud |
| CN117388759A (en) * | 2023-12-07 | 2024-01-12 | 国网辽宁省电力有限公司 | Bus disconnection discriminating method and device utilizing transformer substation monitoring data |
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| CN103326329B (en) * | 2013-07-04 | 2016-02-03 | 南华大学 | The guard method of CT asymmetric broken string quick lock bus |
| CN103715667B (en) * | 2013-12-30 | 2016-06-29 | 广东电网公司电力调度控制中心 | A kind of electrical power trans mission/distribution system guard method and transmission & distribution electrical protective device |
| CN103972872A (en) * | 2014-04-16 | 2014-08-06 | 江苏汉天星配电自动化科技有限公司 | Fault handling method of main lines and branch lines in 10KV distribution automation line |
| CN106602519B (en) * | 2015-10-15 | 2019-08-16 | 中国电力科学研究院 | A kind of bus current differential protection starting element |
| CN106684824B (en) * | 2016-12-29 | 2019-07-23 | 许继集团有限公司 | A kind of transformer differential protection method and device based on current transformer circuit supervision fail |
| CN107069673B (en) * | 2017-03-30 | 2019-01-01 | 南京南瑞继保电气有限公司 | A kind of method that quick identification branch CT breaks and is latched bus differential protection |
| CN106998054B (en) * | 2017-05-24 | 2019-04-16 | 南京国电南自电网自动化有限公司 | A kind of intelligent substation data reliability recognition methods based on information fusion |
| CN107947128B (en) * | 2017-12-28 | 2019-07-23 | 长园深瑞继保自动化有限公司 | The method for quickly judging and selecting bus CT broken string branch |
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| CN101183786A (en) * | 2007-11-16 | 2008-05-21 | 国电南瑞科技股份有限公司 | Anti-CT saturated sampling value differential protection of predicting CT linear transform area |
| CN101847863A (en) * | 2009-03-27 | 2010-09-29 | 湖北省电力试验研究院 | Relay protection method for double-circuit transmission lines on same tower |
| WO2011035052A1 (en) * | 2009-09-17 | 2011-03-24 | Schweitzer Engineering Laboratories, Inc. | Equivalent alpha plane fault determination for a multi-terminal power apparatus |
| CN102005738A (en) * | 2010-12-15 | 2011-04-06 | 国网电力科学研究院 | Method for identifying healthy phase saturation based on current amplitude ratio and differential current harmonic wave |
| CN102842897A (en) * | 2012-09-07 | 2012-12-26 | 北京四方继保自动化股份有限公司 | Locked current protection system and locked current protection method |
| CN103001199A (en) * | 2012-12-12 | 2013-03-27 | 绍兴电力局 | Ethernet-based current differential protection device and implementation method thereof |
| CN103326329A (en) * | 2013-07-04 | 2013-09-25 | 文杰 | Bus protection method for quick locking in CT (current transformer) asymmetric wire breakage |
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| US9779556B1 (en) | 2006-12-27 | 2017-10-03 | Stamps.Com Inc. | System and method for identifying and preventing on-line fraud |
| CN117388759A (en) * | 2023-12-07 | 2024-01-12 | 国网辽宁省电力有限公司 | Bus disconnection discriminating method and device utilizing transformer substation monitoring data |
| CN117388759B (en) * | 2023-12-07 | 2024-02-23 | 国网辽宁省电力有限公司 | Bus disconnection discriminating method and device utilizing transformer substation monitoring data |
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| CN103326329B (en) | 2016-02-03 |
| CN103326329A (en) | 2013-09-25 |
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