Automatic resetting method and system for station service power supply quick switching device

A fast switching and automatic reset technology, applied in the direction of circuit devices, emergency protection circuit devices, power network operating system integration, etc., can solve problems that affect the safety of the unit and the loss of bus power supply

Active Publication Date: 2021-01-08
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the protection device operates correctly and trips the branch circuit breaker within the first time limit, and it is judged that the fault is between the branch circuit breaker and the high power substation, the fast switching device is immediately blocked and wa

Method used

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  • Automatic resetting method and system for station service power supply quick switching device
  • Automatic resetting method and system for station service power supply quick switching device

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0031] Such as figure 1 As shown, an automatic reset 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 current branch circuit breaker and a closing coil 10 of the backup branch circuit breaker.

[0032] Among them, the relay protection system 1 collects the zero-sequence current 2 of the high-power substation branch, and sends out a protection action to block the power supply fast switching signal 4 or a protection action to start the power supply fast switching signal 8 to the power supply fast switching device 5; and sends a jumping branch circuit breaker protection action Signal 3 is sent to the tripping coil 7 of the branch circuit breaker. The power supply fast swi...

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Abstract

The invention discloses an automatic resetting method and system for a station service power supply quick switching device. According to the method, when a power supply quick switching device is locked after receiving a protection locking external contact signal, if a switching starting instruction is continuously received and other conditions causing the device to be locked do not exist, the device automatically resets and quickly has a switching function; and if a grounding fault occurs in a station service power supply working branch, a relay protection system high-station transformer branch zero-sequence over-current protection first time limit action sends out a command for tripping the branch circuit breaker and locking station service power, along with tripping of the branch circuitbreaker, a protection device judges that a fault point is located in a high-voltage station service transformer branch, the branch zero-sequence over-current protection second time limit action continues to start standby power supply switching, the power supply rapid switching device achieves automatic resetting, auxiliary power supply switching is completed, and unit safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of relay protection and safety automatic devices in power plants, and specifically relates to an automatic reset method and system for a plant power fast switching device, which is suitable for use between the plant system working power supply and the backup power supply in the power plant generator set accident state Quickly switch places. Background technique [0002] During the normal operation of the generator set in the power plant, the high-voltage plant transformer has its own plant power system to drive many plant auxiliary machines. In the event of an accident shutdown, in order to ensure the safe shutdown of the unit, the factory power needs to be switched to the backup power supply. This switching operation needs to be completed by the power supply fast switching device. That is to say, it is necessary to issue a switch command to start the plant power through the relay protection device, and the...

Claims

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Application Information

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IPC IPC(8): H02J9/06H02H7/26
CPCH02J9/06H02J9/068H02H7/266Y02B70/30Y04S20/20
Inventor 李泽财都劲松曹浩军付东岩吕尚霖刘瞻侯中峰王小辉李育文周亚群任民
Owner XIAN THERMAL POWER RES INST CO LTD
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