Shenyang SIWO Electrical Equipment Co., Ltd.
Add:No.22, Puyu Road, Dadong District, Shenyang City, Liaoning Province, China
Contact us:Gu Yu
Circuit breaker protection includes: circuit breaker failure protection, automatic reclosing, charge protection, dead zone protection, three-phase inconsistency protection and instantaneous jump. This article mainly discusses the circuit breaker protection in the 3/2 wiring mode.
First, the circuit breaker protection device configuration
Generally in the double busbar, single busbar connection, the transmission line protection to send the trip command only jump at the end of a circuit breaker, reclosing naturally only coincide with this one circuit breaker, so reclosing according to the protection configuration is reasonable.
In the 3/2 wiring way to failure protection, automatic reclosing, three-phase inconsistent protection, dead zone protection and charge protection in a device, this device is known as the circuit breaker protection.
Second, the circuit breaker failure protection
Circuit breaker failure protection refers to the failure of the electrical equipment protection action issued when the trip command and the circuit breaker refused to use, the use of fault equipment protection action information and refused to break the current information circuit breaker circuit breaker failure to distinguish, Short time to cut off the same plant in the other related circuit breakers, so that the power outage is limited to a minimum, so as to ensure the stable operation of the entire power grid, to avoid the generator, transformer and other components of the serious damage and the collapse of the collapse of the accident.
Generally in the 220kV and above circuit breakers on the configuration of circuit breaker failure protection, some important 110kV circuit breaker will also configure the failure function. The following detailed analysis: 3/2 wiring circuit breaker failure protection.
In the 3/2 wiring mode, if a short circuit occurs in line 2, the line protection jumps 5021 and 5022. If 5021 circuit breaker failure, in order to short circuit point of the arc, 5021 circuit breaker failure protection should be 500kV Ⅰ mother all the circuit breaker are jumping.
If a short circuit occurs on the 500kV I mother, the bus protection action jumps on all the circuit breakers on the bus. If 5021 circuit breaker failure, 5021 circuit breaker failure protection should be 5022 circuit breaker to jump, and concurrent remote trip command line jump on the opposite side of the circuit breaker. (Such as connecting components are transformers, then jump on each side of the transformer circuit breaker)
So the edge of the circuit breaker failure protection action should be jumped on the side of the circuit breaker where the circuit breaker and the middle of the circuit breaker and start the remote trip function jump with the side of the circuit breaker connected to the circuit breaker (or jump transformer on each side of the circuit Device).
If a short circuit occurs on line 2, the line protection jumps 5011 and 5021 to two circuit breakers. If 5022 circuit breaker failure, 5022 circuit breaker failure protection should be 5023 circuit breaker to jump, and concurrent jump trip command jump on the main transformer on the 2nd side of the circuit breaker, so short-circuit point to extinguish the arc.
So the circuit breaker failure protection action should be jumped on both sides of the two side of the circuit breaker, and start the remote trip function jump with the circuit breaker connected to the circuit on the side of the circuit breaker (or jump transformer on each side of the circuit breaker).
If the above failure protection does not start the remote trip function, the use of line backup protection Although you can remove the contralateral circuit breaker, but will lengthen the fault removal time. And in the circuit breaker failure protection basically have a malfunction to start the remote trip function.
Double busbar connection circuit breaker failure action process will not repeat them, than the 3/2 wiring way simple point.
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