Temperature Rise Characteristics of Conductors in Electrical Penetrations of Nuclear Power Plantsand Temperature Monitoring Technology Research

Abstract

As specialized electrical equipment for medium-voltage power, low-voltage power, instrumentation and control, and coaxial cables penetrating the inner and outer sides of the containment, nuclear power plant electrical penetrations primarily function to maintain power transmission and signal communication for electrical equipment. Their sealing and insulation performance are critical to ensuring the integrity of the reactor pressure boundary. To address the issues of organic material aging and conductor heating in electrical penetrations during long-term operation, this paper investigates and validates the heating characteristics and temperature monitoring methods for electrical penetraon conductors, based on the actual conditions of electrical penetrations in a domestic NPP. By establishing a temperature rise experimental platform that includes a containment mock-up, temperature rise tests were conducted on the electrical penetration conductor assemblies to study the conductor heating characteristics.