System for periodic test of nuclear power plant

Abstract

The invention belongs to the technical field of safety level protection systems and aims to solve the technical problems of periodic test solutions in the prior art that disturbances are caused by manual operations and the solutions are unsuitable for normally-closed contacts. The invention provides a signal switching board card, and a system and method for periodic testing of a nuclear power plant. The signal switching board card comprises a signal input terminal, a signal output terminal, a bypass signal input terminal, a switching signal input terminal, a first branch and a second branch, wherein a normally closed contact is arranged in the first branch; the second branch is parallel to the first branch and is provided with a switching element. When a protection system works normally, the switching element is in a normally open state; when the protection system is subjected to the periodic test, the switching element is in a normally closed state, and a locked state is formed between the second branch and the signal output terminal; when the periodic test is ended, a signal for maintaining the closed state is input to the normally closed contact in the first branch.

Description

technical field [0001] The present invention relates to the technical field of safety-level protection systems, in particular to the technical field of periodic tests of nuclear power plant safety protection systems, and more specifically, to a signal switching board, a system and method for periodic tests of nuclear power plants. Background technique [0002] The reactor protection system of a nuclear power plant is an important part of a nuclear power plant. Its main function is to trigger an emergency shutdown when the operating conditions exceed the limit, and to start safety injection, auxiliary water supply, containment isolation and other special safety protection systems under accident conditions. facility. Therefore, the protection system needs to conduct regular tests to check whether the protection system can output according to the predetermined requirements; and when the protection system conducts regular tests, it should ensure that the control signal output to...

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Problems solved by technology

[0005] In order to solve the technical problems of the periodic test technical scheme in the prior art, which may be disturbed due to manual operation and not suitable for normally closed contacts; the present invention provides a signal switching board, which is used in the system and method, not only suitable for regular tests of normally closed contacts, but also without manual on-off test terminals

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