In-depth theoretical and engineering application analysis is carried out to analyze the root causes of the failure of nuclear power plant prefered modules.Based on the principle and requirements of electromagnetic compatibility(EMC)protection,the research on the identification technology of interference sources and key characteristics is carried out.A relay isolation scheme is adopted to protect against electromagnetic interference.A renewal diode scheme is added to protect against reverse electromotive force.After test verification,the relay isolation scheme can meet the electromagnetic interference protection requirements of the feedback channel of the preferred module,and the remenal diode scheme can meet the reverse electromotive force protection requirements of the output channel of the preferred module.The research improves the anti-electromagnetic interference capability of the safety-grade signal acquisition circuit,establishes a strong interference test technology program based on EMC test,and effectively solves the problem of transient interference that cannot be accurately generated in the laboratory.
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