System for periodic test of nuclear power plant
A technology for periodic testing and nuclear power plants, which is used in nuclear power generation, nuclear engineering, nuclear reactor monitoring, etc., and can solve problems such as manual operation disturbances and inapplicable normally closed contacts.
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[0021] Such as figure 1 As shown, this embodiment provides a signal switching board 100, the signal switching board 100 is suitable for nuclear power plant protection systems, especially suitable for controlling the switching of digital signals, the signal switching board 100 includes:
[0022] Signal input terminals 131, 132, signal output terminals 141, 142, bypass signal input terminal 110 and switching signal input terminal 120;
[0023] A first branch is provided between the signal input terminals 131, 132 and the signal output terminals 141, 142, and a normally closed contact is arranged in the first branch; and
[0024] The second branch connected in parallel with the first branch is provided with a switching element K; when the nuclear power plant protection system is working normally, the switching element K is in a normally open state; when the nuclear power plant protection system is performing periodic tests, the switching element K is in a normally closed state, ...
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