In a nuclear power plant

between the generator terminal and the step-up transformer

generator circuit breakers are installed

and generator circuit breaker failure protection is also installed. This paper analyzes the protections and the value settings of the nuclear power plant generator

and points out the problems in the generator circuit breaker failure protection design. First

in the protection of some jump starter generator circuit breakers

de-excitation

and the main valve closing

as the current criteria are not satisfied

the starter generator circuit breaker failure protection cannot be directly activated. Secondly

during the turbo-generator program tripping process

the generator circuit breakers break down and cannot trip

neither can the generator circuit breaker failure protection be activated. Based on the harm caused by these problems

this paper proposes some improvements on the nuclear power plant generator breaker failure protection design

further improving the generator circuit breaker failure protection design in the nuclear power plant.