CN112202238B - Automatic resetting method and system for factory power supply fast switching device - Google Patents
Automatic resetting method and system for factory power supply fast switching device Download PDFInfo
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- CN112202238B CN112202238B CN202011043522.1A CN202011043522A CN112202238B CN 112202238 B CN112202238 B CN 112202238B CN 202011043522 A CN202011043522 A CN 202011043522A CN 112202238 B CN112202238 B CN 112202238B
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- H02H7/266—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 switching on a spare supply
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses an automatic resetting method and an automatic resetting system for a factory power supply quick switching device. If the working branch of the plant power supply has a ground fault, the relay protection system high-voltage plant branch zero-sequence overcurrent protection acts for a time limit to jump the branch circuit breaker and lock the plant power switching instruction, but the branch circuit breaker jumps, the protection device judges that the fault point is positioned in the high-voltage plant transformer branch, the branch zero-sequence overcurrent protection acts for a two time limit to continuously start the switching of the standby power supply, the power quick switching device realizes automatic resetting, the plant power switching is completed, and the safety of a unit is ensured.
Description
Technical Field
The invention belongs to the technical field of relay protection and safety automatic devices of power plants, and particularly relates to an automatic resetting method and an automatic resetting system for a rapid switching device of a plant power supply, which are suitable for occasions for rapidly switching between a working power supply and a standby power supply of the plant system in an accident state of a generating set of the power plant.
Background
When the generating set of the power plant normally operates, the high-voltage station transformer is provided with a station power system to drive a plurality of station auxiliary machines to operate. When the emergency shutdown is carried out, in order to ensure the safe shutdown of the unit, the auxiliary power supply needs to be switched to a standby power supply, and the switching operation needs to be completed by a power supply quick switching device. Namely, a switching instruction for starting the service power needs to be sent out through the relay protection device, the service power is switched from the working power to the standby power in time through the power supply quick switching device, and the standby power (starting standby transformer) runs with the service power.
From the technical specification and the operation condition of the manufacturer of the power supply fast switching device at present, when the power supply fast switching device performs certain protection actions (such as branch zero sequence overcurrent and the like), in order to prevent the standby power supply from being put into a fault bus by mistake, a device is locked by a free contact given by protection, and the device gives a protection locking signal and enters a waiting reset state. The protection locking signal is required to be eliminated when the abnormal condition is eliminated and the alarm signal is manually reset, and then the locking response switching instruction can be released (for example, the service quick switching device can be automatically locked when the switching is completed, the protection locking is carried out, the switch position is abnormal, the bus PT is disconnected and the like).
However, the field case shows that in some cases, the operation of "manual reset" of the power supply fast switching device needs to be performed manually, and the requirement of safe operation of the unit cannot be met. If a neutral point is grounded through a small resistor, two time limits are set for branch zero-sequence overcurrent protection of a low-voltage side of a high-voltage station transformer according to item 4.3.2.1 of DL/T1502-2016 (guide rule for Relay protection setting calculation for station service) in a system, and one time limit acts on tripping a branch circuit breaker and locking a standby power supply for switching; the two time limits act on stopping and starting the switching of the standby power supply. When a high-voltage station service transformer branch fails, the protection device sends an instruction to trip off the branch circuit breaker and lock the power supply fast switching device for switching within a first time limit; the second time limit (which is 200 ms-500 ms longer than the first time limit) sends a command for switching between the shutdown and the startup of the standby power supply. Therefore, even if the protection device correctly acts for tripping the branch circuit breaker within the first time limit and judges that the fault is between the branch circuit breaker and the station transformer, the fast switching device is immediately locked to wait for manual reset, and the second time limit after 200-500 ms does not have practical significance for starting the standby power supply to switch, so that the power of the whole section of station bus power supply is lost, and the safety of the unit is seriously influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an automatic resetting method and system for a factory power supply quick switching device.
The invention is realized by the following technical scheme:
an automatic resetting method for a factory power supply quick switching device comprises the following steps:
step 101) a power plant high plant variable branch generates a ground fault, a relay protection system high plant variable branch zero sequence protection acts for a time limit, a branch circuit breaker is tripped, and a station service switching instruction is locked to the branch circuit breaker and a power supply fast switching device respectively, and the steps 102) and 103) are carried out;
step 102), tripping the branch circuit breaker after receiving a tripping instruction, judging a fault on a non-bus side by a relay protection system, performing high-voltage plant branch changing zero-sequence protection two-time-limit action after 200-500 ms, continuously sending a standby power supply electricity switching starting instruction, and entering step 104);
step 103), after the power supply fast switching device receives a service power locking switching instruction, locking the device and entering step 104);
step 104) the power supply fast switching device receives a standby power supply switching starting instruction in a locking state, and the device automatically resets under the condition that no other device is closed in self-checking, and then the step 105) is carried out;
step 105) the power supply fast switching device executes a standby power supply switching starting instruction, sends a closing instruction to the standby branch circuit breaker, and enters step 106);
and 106) the standby branch circuit breaker receives a closing instruction, the standby branch circuit breaker closes, and service switching is completed.
The invention is further improved in that the power plant high-plant variable branch in the step 101) comprises a single branch or a plurality of branches, and the ground fault comprises one or more combinations of ground faults.
An automatic reset system of a factory power supply fast switching device comprises:
the relay protection system is used for judging the service power supply fault and giving a tripping and locking or starting service power switching instruction;
the power supply fast switching device is used for receiving a starting or locking switching instruction to control a working power supply and a standby branch circuit breaker of the station service system;
the branch circuit breaker and the standby branch circuit breaker of the service power system working power supply are used for executing switching-on and switching-off operations.
The invention is further improved in that the branch circuit breaker and the standby branch circuit breaker respectively execute the opening and closing operations through a tripping coil of the branch circuit breaker and a closing coil of the standby branch circuit breaker.
The invention has the further improvement that the relay protection system collects the zero-sequence current of the high-voltage substation and sends a protection action locking power supply fast switching signal or a protection action starting power supply fast switching signal to the power supply fast switching device; sending a tripping branch circuit breaker protection action signal to a tripping coil of the branch circuit breaker; and the power supply quick switching device sends a signal of combining the standby branch circuit breaker to a closing coil of the standby branch circuit breaker.
The invention is further improved in that the power supply fast switching device has no locking signal mark when the power supply fast switching device has no other locking.
Compared with the prior art, the invention has the following beneficial technical effects:
when the service power supply working branch earth fault occurs, a high-plant branch zero-sequence protection time limit action is carried out through a relay protection system, a branch circuit breaker jumping instruction and a service power locking switching instruction are sent to the branch circuit breaker and the power supply fast switching device respectively, and after the power supply fast switching device receives the service power locking switching instruction, the locking device enters a waiting resetting state. The wait-to-reset state requires human intervention to be resolved. The invention can automatically reset logic through the power supply fast switching device under the premise of not reducing any safety of the original device, so that the device can quickly recover the switching function.
Further, after the branch circuit breaker receives a tripping instruction, the branch circuit breaker is tripped after the inherent opening delay (30-40 ms) of the circuit breaker, if the fault quantity exists continuously, the relay protection system judges that the fault point is not a bus side fault, the high-rise station branch zero-sequence protection acts for two time limits after 200-500 ms, and the protection device continuously sends a switching instruction of starting the standby power supply. Under the condition, the actual fault point is positioned between the branch circuit breaker and the high-rise substation, and the power supply quick switching device acts to combine with the standby power supply circuit breaker so as not to cause switching-on to the fault bus. Therefore, when the power supply fast switching device is in a locking state and continues to receive a switching instruction of starting the standby power supply, the switching should be carried out in time. For safety and reliability, it is also necessary to satisfy the condition that there is no other blocking condition (such as abnormal switch position, disconnection of bus PT, etc.), that is, the blocking signal confirmed manually is automatically replaced by the device, so that the device can quickly recover the switching function. The invention automatically triggers the device to reset on the premise of not sacrificing any safety and reliability of the original power supply quick switching device, so that the device recovers the switching function.
Furthermore, the invention can be realized by modifying the software logic of the power supply quick switching device without adding additional equipment and circuits, the cost can be almost ignored, and the invention is simple and easy to implement.
Drawings
Fig. 1 is a schematic diagram of an automatic reset system of a factory power supply fast switching device according to the present invention.
Fig. 2 is a flowchart of an automatic resetting method of the factory power supply fast switching device according to the present invention.
Description of reference numerals:
1-a relay protection system; 2-high plant branch zero-sequence current; 3-tripping the branch circuit breaker to protect the action signal; 4-protection action locking power supply fast switching signal; 5-power supply fast switching device; 6-the power supply fast switching device has no other locking signal state mark; 7-this branch breaker trip coil; 8-protection action starts power supply fast switching signal; 9-the power supply fast switching device combines the signal of the standby branch circuit breaker; 10-closing coil of the standby branch circuit breaker.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1, the automatic resetting power supply fast switching system provided by the present invention includes a relay protection system 1, a power supply fast switching device 5, a tripping coil 7 of the present branch circuit breaker, and a closing coil 10 of the standby branch circuit breaker.
The relay protection system 1 acquires a high-rise transformer branch zero-sequence current 2 and sends a protection action locking power supply fast switching signal 4 or a protection action starting power supply fast switching signal 8 to a power supply fast switching device 5; and sending a tripping branch circuit breaker protection action signal 3 to a tripping coil 7 of the branch circuit breaker. The power fast switching device 5 sends a combined standby branch breaker signal 9 to a standby branch breaker closing coil 10. When the power supply fast switching device has no other locking, the power supply fast switching device has no locking signal mark 6.
As shown in fig. 1 and fig. 2, the automatic resetting method for the factory power supply fast switching apparatus provided by the invention comprises the following steps:
step 101) a power plant high plant variable branch generates a ground fault, a relay protection system high plant variable branch zero sequence protection acts for a time limit, a branch circuit breaker is tripped, and a station service switching instruction is locked to the branch circuit breaker and a power supply fast switching device respectively, and the steps 102) and 103) are carried out;
step 102), tripping the branch circuit breaker after receiving a tripping instruction, judging a fault on a non-bus side by a relay protection system, performing high-voltage plant branch changing zero-sequence protection two-time-limit action after 200-500 ms, continuously sending a standby power supply electricity switching starting instruction, and entering step 104);
step 103), after the power supply fast switching device receives a service power locking switching instruction, locking the device and entering step 104);
step 104) the power supply fast switching device receives a standby power supply switching starting instruction in a locking state, and the device automatically resets under the condition that no other device is closed in self-checking, and then the step 105) is carried out;
step 105) the power supply fast switching device executes a standby power supply switching starting instruction, sends a closing instruction to the standby branch circuit breaker, and enters step 106);
and 106) the standby branch circuit breaker receives a closing instruction, the standby branch circuit breaker closes, and service switching is completed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. An automatic resetting method for a factory power supply quick switching device is characterized by comprising the following steps:
step 101) a power plant high plant variable branch generates a ground fault, a relay protection system high plant variable branch zero sequence protection acts for a time limit, a branch circuit breaker is tripped, and a station service switching instruction is locked to the branch circuit breaker and a power supply fast switching device respectively, and the steps 102) and 103) are carried out;
step 102), tripping the branch circuit breaker after receiving a tripping instruction, judging a fault on a non-bus side by a relay protection system, performing high-voltage plant branch changing zero-sequence protection two-time-limit action after 200-500 ms, continuously sending a standby power supply electricity switching starting instruction, and entering step 104);
step 103), after the power supply fast switching device receives a service power supply switching locking instruction, locking the device and entering step 104);
step 104) the power supply fast switching device receives a standby power supply switching starting instruction in a locking state, and the device automatically resets under the condition that no other device is closed in self-checking, and then the step 105) is carried out;
step 105) the power supply fast switching device executes a standby power supply switching starting instruction, sends a closing instruction to the standby branch circuit breaker, and enters step 106);
and 106) the standby branch circuit breaker receives a closing instruction, the standby branch circuit breaker closes, and service switching is completed.
2. The automatic recovery method for factory power supply fast switching device according to claim 1, wherein the power plant high-plant variation branch in step 101) comprises a single branch or a plurality of branches, and the ground fault comprises a combination of one or more ground faults.
3. An automatic reset system of a factory power supply quick switching device, which utilizes the automatic reset method of the factory power supply quick switching device according to claim 1, is characterized by comprising:
the relay protection system (1) is used for judging the service power supply fault and giving a tripping and locking or starting service power switching instruction;
the power supply fast switching device (5) is used for receiving a starting or locking switching instruction to control a working power supply and a standby branch circuit breaker of the station service system;
the branch circuit breaker and the standby branch circuit breaker of the service power system working power supply are used for executing switching-on and switching-off operations.
4. The automatic resetting system of the plant power supply fast switching device according to claim 3, wherein the branch circuit breaker and the standby branch circuit breaker respectively perform the opening and closing operations through the trip coil (7) of the branch circuit breaker and the closing coil (10) of the standby branch circuit breaker.
5. The automatic resetting system of the plant power supply quick switching device according to claim 4, wherein the relay protection system (1) collects the high plant variable branch zero-sequence current (2) and sends a protection action locking power supply quick switching signal (4) or a protection action starting power supply quick switching signal (8) to the power supply quick switching device (5); sending a trip branch circuit breaker protection action signal (3) to a trip coil (7) of the branch circuit breaker; the power supply quick switching device (5) sends a combined standby branch breaker signal (9) to a standby branch breaker closing coil (10).
6. The automatic resetting system of factory power supply fast switching device according to claim 5, wherein when the power supply fast switching device (5) has no other latch, the power supply fast switching device has no latch signal flag (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011043522.1A CN112202238B (en) | 2020-09-28 | 2020-09-28 | Automatic resetting method and system for factory power supply fast switching device |
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| CN202011043522.1A CN112202238B (en) | 2020-09-28 | 2020-09-28 | Automatic resetting method and system for factory power supply fast switching device |
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| CN114204666A (en) * | 2021-12-15 | 2022-03-18 | 华能平凉发电有限责任公司 | Power supply input method for backup of low-voltage branch dead zone fault in high-rise plant |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630835A (en) * | 2009-08-12 | 2010-01-20 | 国电南京自动化股份有限公司 | Bus-coupled or segmented charge protection method |
| CN102055235A (en) * | 2011-01-12 | 2011-05-11 | 广东省电力调度中心 | Spare power automatic switching method for 220kV side circuit and bus of 220kV transformer station |
| CN104362735A (en) * | 2014-11-06 | 2015-02-18 | 山东中实易通集团有限公司 | Method for narrowing outage range of power station |
| CN106160185A (en) * | 2015-03-25 | 2016-11-23 | 南京理工大学 | A kind of method using fast switching device to carry out power supply switching |
| CN106169806A (en) * | 2016-07-29 | 2016-11-30 | 宁夏大唐国际大坝发电有限责任公司 | Prevent power plant from starting spare transformer overladen switching locking limiter |
| CN107465255A (en) * | 2017-08-10 | 2017-12-12 | 西安热工研究院有限公司 | A kind of Turbo-generator Set accident starts auxiliary Power switching method and system |
| WO2018000192A1 (en) * | 2016-06-28 | 2018-01-04 | 陈锡瑜 | Capacitor trip device having automatic power switching and method therefor |
| CN111463756A (en) * | 2020-05-07 | 2020-07-28 | 华电电力科学研究院有限公司 | Protection locking joint optimization method based on high-service bus protection and fast switching device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10049830B2 (en) * | 2015-06-26 | 2018-08-14 | Amazon Technologies, Inc. | Relay architecture for transferring from redundant power sources |
-
2020
- 2020-09-28 CN CN202011043522.1A patent/CN112202238B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630835A (en) * | 2009-08-12 | 2010-01-20 | 国电南京自动化股份有限公司 | Bus-coupled or segmented charge protection method |
| CN102055235A (en) * | 2011-01-12 | 2011-05-11 | 广东省电力调度中心 | Spare power automatic switching method for 220kV side circuit and bus of 220kV transformer station |
| CN104362735A (en) * | 2014-11-06 | 2015-02-18 | 山东中实易通集团有限公司 | Method for narrowing outage range of power station |
| CN106160185A (en) * | 2015-03-25 | 2016-11-23 | 南京理工大学 | A kind of method using fast switching device to carry out power supply switching |
| WO2018000192A1 (en) * | 2016-06-28 | 2018-01-04 | 陈锡瑜 | Capacitor trip device having automatic power switching and method therefor |
| CN106169806A (en) * | 2016-07-29 | 2016-11-30 | 宁夏大唐国际大坝发电有限责任公司 | Prevent power plant from starting spare transformer overladen switching locking limiter |
| CN107465255A (en) * | 2017-08-10 | 2017-12-12 | 西安热工研究院有限公司 | A kind of Turbo-generator Set accident starts auxiliary Power switching method and system |
| CN111463756A (en) * | 2020-05-07 | 2020-07-28 | 华电电力科学研究院有限公司 | Protection locking joint optimization method based on high-service bus protection and fast switching device |
Non-Patent Citations (3)
| Title |
|---|
| 500 kV启动/备用变压器感应耐压试验方法的分析与研究;王团结 等;《陕西电力》;20131231;第41卷(第7期);第86-88页 * |
| Evaluation of Switching Surge Risks on the Low-Voltage Auxiliary System of Frequent Start-Stop Plant;Chih-Ju Chou et al.;《IEEE TRANSACTIONS ON POWER DELIVERY》;20120713;第27卷(第3期);第2054-2062页 * |
| RCS9652备用电源自投装置KKJ复归问题的分析;史贵孟 等;《电力安全技术》;20140131;第16卷(第1期);第34-35页 * |
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