A method and system for on-line monitoring of insulation of a medium voltage bus in a nuclear power plant

Abstract

The application discloses a kind of nuclear power plant medium voltage bus insulation on-line monitoring method and system, and the insulation response section is identified to bus operation data by executing low-frequency detection signal injection, impedance sensitivity is preferentially collected and frames are formed to form insulation response frame;Adaptive filtering matching is carried out to insulation response frame, and frequency domain feature weighted extraction is corrected by temperature drift, to build impedance calculation unit;Deterioration feature is mapped to form insulation reference spectrum by impedance calculation unit, to generate impedance deterioration sequence by evaluating deterioration rate and acceleration, to generate early warning signal frame by hierarchical marking;Impedance recovery accumulation feature is identified by early warning signal frame deterioration continuity detection, to activate hierarchical early warning response strategy to build insulation correction scheme;Form impedance trend curve based on insulation correction scheme insulation period inspection, determine data sending node by adaptive transmission time delay evaluation, execute centralized control response check to generate insulation monitoring report, improve the accuracy and early warning timeliness of nuclear power plant medium voltage bus insulation on-line monitoring.

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