CN113394757A - Single-trip-coil-unit-based outlet circuit breaker failure protection method - Google Patents
Single-trip-coil-unit-based outlet circuit breaker failure protection method Download PDFInfo
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- CN113394757A CN113394757A CN202110675397.4A CN202110675397A CN113394757A CN 113394757 A CN113394757 A CN 113394757A CN 202110675397 A CN202110675397 A CN 202110675397A CN 113394757 A CN113394757 A CN 113394757A
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- circuit breaker
- failure
- monitoring system
- grid
- trip coil
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a single-trip coil unit outlet circuit breaker failure protection method, which comprises the following steps of: (S1) the power station monitoring system receives the accident signal, and the breaker failure judgment logic in the monitoring system is started; (S2) determining whether the circuit breaker is at risk of failure; (S3) if the circuit breaker is at risk of failure, proceeding to step (S4); (S4) judging whether the single-trip coil unit is still in a grid-connected state; if the grid-connected state is still in the on-grid state, the step (S5) is carried out; (S5) comparing the terminal current obtained by AC sampling with the set current value by the monitoring system to obtain the result of whether the breaker is out of order; if the monitoring system does not act, the monitoring system does not send out action; and if the judgment result shows that the system is out of order, starting protection. The method overcomes the defects that the traditional backup protection device is limited by sensitivity requirements, the protection range is enlarged due to the boosting effect of each branch, and the like, so that the power failure range is limited to the minimum, the system stability is improved, and the safer operation of the unit is ensured.
Description
Technical Field
The invention relates to the technical field of breaker failure protection, in particular to a single-trip-coil-unit-based outlet breaker failure protection method.
Background
In a power plant adopting the single-tripping-coil unit outlet circuit breaker, if a unit has an accident, when a monitoring system sends a tripping command to remove the fault, the circuit breaker is rejected along with the disconnection or other faults of the single-tripping coil, the failure fault of the circuit breaker occurs, the serious burning loss of fault elements such as a generator and a transformer and the breakdown and collapse accidents of a power grid are easily caused, and the safe operation of the unit is seriously threatened.
Although part of protection devices have a certain backup function, faults can be effectively removed when the circuit breaker fails, the adjacent elements are the simplest and most reasonable backup mode as a backup protection scheme, the measured impedance is increased due to the boosting function of each branch, the protection range is enlarged and is limited by the sensitivity requirement, the precision is not accurate enough, the realization of the backup mode is often difficult, and the problems of system instability and the like are caused due to the fact that the action time is long and the accident range is easily enlarged. Therefore, in order to solve the above problems, it is necessary to provide a method for implementing failure protection of an outlet circuit breaker of a unit based on a single trip coil.
Disclosure of Invention
The invention aims to provide a single-trip-coil-unit-based outlet circuit breaker failure protection method, which mainly solves the problems that in the prior art, when a single-trip-coil circuit breaker fails, the sensitivity of backup protection is insufficient, the action time is long, and the accident range is expanded.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a single-trip coil unit outlet circuit breaker failure protection method comprises the following steps:
(S1) the power station monitoring system receives the accident signal, and the breaker failure judgment logic in the monitoring system is started;
(S2) the monitoring system judges whether the outlet breaker of the single tripping coil unit is at the switching-on position; judging whether the breaker has the risk of failure or not;
(S3) if the circuit breaker is not at risk of failure, ending the failure logic determination; if the breaker is at risk of failure, proceeding to step (S4);
(S4) judging whether the single-trip coil unit is still in a grid-connected state; if the grid connection state is not achieved, ending the failure logic judgment; if the grid-connected state is still in the on-grid state, the step (S5) is carried out;
(S5) comparing the terminal current obtained by AC sampling with the set current value by the monitoring system to obtain the result of whether the breaker is out of order; if the monitoring system does not act, the monitoring system does not send out action; and if the judgment result shows that the system is out of order, starting protection.
Further, in the step (S1), the accident signal includes a unit electrical accident, a unit mechanical accident, and a unit emergency accident.
Further, in step (S2), if the breaker is not in the on position, indicating that the breaker has been successfully opened by the trip coil, the breaker does not fail; if the circuit breaker is in the closed position, the circuit breaker is at risk of failure.
Further, in the step (S4), by determining whether the single trip coil unit outlet isolation switch is at the switch-on position, determining whether the single trip coil unit is still in the grid-connected state; if the isolation switch is in the switch-on position, the single trip coil unit is still in a grid-connected state, and is not disconnected from the power grid, so that the possibility of failure exists; if the isolation knife switch is not in the switch-on position, the single tripping coil unit is not in the grid-connected state, and the circuit breaker has no possibility of failure.
Further, in the step (S5), if the terminal current obtained by ac sampling of the monitoring system is smaller than the set current value, the actual position of the circuit breaker may be disconnected, and the monitoring of the collected circuit breaker position signal is incorrect, thereby ending the failure logic determination; if the current at the machine end is larger than the set current value, the circuit breaker is rejected, the circuit breaker failure phenomenon occurs, after the short time delay, the monitoring system sends out a circuit breaker failure protection signal, and the circuit breaker at the upper stage of the circuit breaker at the outlet of the single trip coil machine set is tripped.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a circuit breaker failure logic program section is added in the unit monitoring system, the power station monitoring system is utilized to logically judge the position of the circuit breaker, the position of the isolation switch and the current at the machine end, when the circuit breaker fails, the monitoring system is started to perform failure protection, and the previous-stage circuit breaker of the circuit breaker at the outlet of the unit is tripped, so that the failure protection of the circuit breaker with the single trip coil is realized, the defects that the traditional backup protection device is limited by sensitivity requirements, the protection range is increased due to the boosting action of each branch circuit and the like are overcome, the accident range is prevented from being expanded, the power failure range is limited to the minimum, the system stability is improved, and the safer operation of the unit is ensured.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
FIG. 2 is a logic diagram of the method of the present invention.
FIG. 3 is a diagram of the main wiring of the power station section according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
As shown in fig. 1 and 2, in the method for protecting the failure of the outlet circuit breaker of the unit based on the single trip coil, when a power station monitoring system receives an accident signal, such as an accident signal of one of an electrical accident of the unit, a mechanical accident of the unit and an emergency accident of the unit, and needs to trip off the circuit breaker, a circuit breaker failure logic program section is started to be started to perform circuit breaker failure judgment, taking the 1F unit in the main connection diagram of fig. 3 as an example, the monitoring system firstly judges whether the outlet circuit breaker DL1 of the 1F unit is at a switching-on position, if the circuit breaker is not at the switching-on position, the circuit breaker is successfully switched off under the action of a trip coil, the circuit breaker does not fail, the failure logic judgment is finished, if the circuit breaker is at the switching-on position, the next circuit breaker is performed, whether the isolation knife gate G11 of the unit outlet is at the switching-on position is judged, if the isolation knife is at the switching-on position, then, the 1F unit is still in a grid-connected state, is not disconnected with a power grid, has the possibility of failure, continues to judge the current, if the terminal current obtained by the alternating current sampling of the monitoring system is less than the set current value, the actual position of the breaker is disconnected, the collected breaker position signal is monitored to be incorrect, if the machine end current is greater than the set current value, the breaker is rejected, the breaker failure phenomenon occurs, after a short time delay T, the monitoring system sends out a breaker failure protection signal to trip the previous stage breaker of the 1F unit outlet breaker, in the main wiring diagram of the power station part in FIG. 2, because the low-voltage side of the 1B main transformer is not provided with the circuit breaker, the monitoring system can jump off the circuit breaker DL201 on the high-voltage side of the 1B main transformer, so that the fault range is reduced to the greatest extent, and the serious burning loss of fault elements such as a generator, a transformer and the like is avoided.
According to the invention, a circuit breaker failure logic program section is added in the unit monitoring system, the power station monitoring system is utilized to logically judge the position of the circuit breaker, the position of the isolation switch and the current at the machine end, when the circuit breaker fails, the monitoring system is started to perform failure protection, and the previous-stage circuit breaker of the circuit breaker at the outlet of the unit is tripped, so that the failure protection of the circuit breaker with the single trip coil is realized, the defects that the traditional backup protection device is limited by sensitivity requirements, the protection range is increased due to the boosting action of each branch circuit and the like are overcome, the accident range is prevented from being expanded, the power failure range is limited to the minimum, the system stability is improved, and the safer operation of the unit is ensured. Therefore, compared with the prior art, the invention has outstanding substantive features and remarkable progress.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (5)
1. A single-trip coil unit outlet circuit breaker failure protection method is characterized by comprising the following steps:
(S1) the power station monitoring system receives the accident signal, and the breaker failure judgment logic in the monitoring system is started;
(S2) the monitoring system judges whether the outlet breaker of the single tripping coil unit is at the switching-on position; judging whether the breaker has the risk of failure or not;
(S3) if the circuit breaker is not at risk of failure, ending the failure logic determination; if the breaker is at risk of failure, proceeding to step (S4);
(S4) judging whether the single-trip coil unit is still in a grid-connected state; if the grid connection state is not achieved, ending the failure logic judgment; if the grid-connected state is still in the on-grid state, the step (S5) is carried out;
(S5) comparing the terminal current obtained by AC sampling with the set current value by the monitoring system to obtain the result of whether the breaker is out of order; if the monitoring system does not act, the monitoring system does not send out action; and if the judgment result shows that the system is out of order, starting protection.
2. The single trip coil based unit outlet circuit breaker failure protection method of claim 1, wherein in the step (S1), the accident signal comprises a unit electrical accident, a unit mechanical accident, and a unit emergency accident.
3. The single trip coil based outlet circuit breaker failure protection method of claim 2, wherein in step (S2), if the circuit breaker is not in the closing position, indicating that the circuit breaker has been successfully opened by the trip coil, the circuit breaker is not failed; if the circuit breaker is in the closed position, the circuit breaker is at risk of failure.
4. The single trip coil unit outlet circuit breaker failure protection method according to claim 3, wherein in the step (S4), it is determined whether the single trip coil unit is still in a grid-connected state by determining whether the single trip coil unit outlet isolation knife-switch is in a switch-on position; if the isolation switch is in the switch-on position, the single trip coil unit is still in a grid-connected state, and is not disconnected from the power grid, so that the possibility of failure exists; if the isolation knife switch is not in the switch-on position, the single tripping coil unit is not in the grid-connected state, and the circuit breaker has no possibility of failure.
5. The single-trip coil unit outlet circuit breaker failure protection method as claimed in claim 4, wherein in step (S5), if the terminal current sampled by the monitoring system ac is less than the set current value, there is a possibility that the actual position of the circuit breaker has been disconnected, and the monitoring of the collected circuit breaker position signal is incorrect, so as to end the failure logic judgment; if the current at the machine end is larger than the set current value, the circuit breaker is rejected, the circuit breaker failure phenomenon occurs, after the short time delay, the monitoring system sends out a circuit breaker failure protection signal, and the circuit breaker at the upper stage of the circuit breaker at the outlet of the single trip coil machine set is tripped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675397.4A CN113394757A (en) | 2021-06-18 | 2021-06-18 | Single-trip-coil-unit-based outlet circuit breaker failure protection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675397.4A CN113394757A (en) | 2021-06-18 | 2021-06-18 | Single-trip-coil-unit-based outlet circuit breaker failure protection method |
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| CN113394757A true CN113394757A (en) | 2021-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110675397.4A Pending CN113394757A (en) | 2021-06-18 | 2021-06-18 | Single-trip-coil-unit-based outlet circuit breaker failure protection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114566946A (en) * | 2022-04-18 | 2022-05-31 | 北京汇智天华新能源科技有限公司 | Fault processing method and equipment for grid-connected contactor of wind generating set |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203951167U (en) * | 2014-03-14 | 2014-11-19 | 中国能源建设集团广东省电力设计研究院 | Generator outlet circuit-breaker failure portection equipment |
| CN205407235U (en) * | 2016-03-02 | 2016-07-27 | 苏州热工研究院有限公司 | A protection device that is used for generator export circuit breaker malfunctioning |
-
2021
- 2021-06-18 CN CN202110675397.4A patent/CN113394757A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203951167U (en) * | 2014-03-14 | 2014-11-19 | 中国能源建设集团广东省电力设计研究院 | Generator outlet circuit-breaker failure portection equipment |
| CN205407235U (en) * | 2016-03-02 | 2016-07-27 | 苏州热工研究院有限公司 | A protection device that is used for generator export circuit breaker malfunctioning |
Non-Patent Citations (2)
| Title |
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| 姚铁兵等: "海阳核电发电机出口断路器失灵保护设计方案浅析", 《电气应用》 * |
| 李文友等: "GCB失灵保护动作逻辑探讨", 《工业技术创新》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114566946A (en) * | 2022-04-18 | 2022-05-31 | 北京汇智天华新能源科技有限公司 | Fault processing method and equipment for grid-connected contactor of wind generating set |
| CN114566946B (en) * | 2022-04-18 | 2024-02-06 | 北京汇智天华新能源科技有限公司 | Method and equipment for processing faults of grid-connected contactor of wind generating set |
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Application publication date: 20210914 |