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电伴热系统作为快堆核电站的必备辅助系统,其安全性和可靠性直接影响到各加热工艺系统和设备的稳定运行。电伴热元件是电伴热系统的关键设备,接地短路和断路是其两个基本故障现象,两者的发生原因各不相同,但在发展过程中相互影响,为全面分析这两个基本故障的发生机理,需将两方面分析有机地统一起来。先分析了形和△形接线方式下的电伴热元件芯线轴向电压幅值分布及对绝缘性能的影响,结果表明接线方式对电伴热元件接地短路故障概率有较大影响;后分析了形接线方式下不同数量的电伴热元件断路故障的发展过程,即从同相单组断路故障发展为多组断路故障直至全相断路。基于上述分析成果,结合电伴热元件制造和安装过程中可能出现的问题,总体得出电伴热元件故障发展模式,并提出降低故障风险的解决方案。
Electric heat tracing system as an auxiliary system of fast reactor nuclear power plant, the safety and reliability of a direct impact on the stability of the heating process systems and equipment. Electric tracing element is the key equipment of electric tracing system. Grounding short circuit and open circuit are two basic faults. The causes of the two are different but affect each other in the process of development. In order to comprehensively analyze the two basic faults The mechanism of occurrence, the two aspects need to be organically unified. The paper analyzes the axial voltage amplitude distribution and the influence on the insulation performance of the electric heating element under the shape and delta connection mode. The results show that the connection mode has a great influence on the probability of grounding short circuit failure of the electric heating element. After analysis According to the development of different types of electric tracing components in the form of connection mode, it develops from single-phase single-phase fault to multi-group open-circuit fault and all-phase open-circuit. Based on the above analysis results, combined with possible problems in the process of manufacture and installation of electric tracing element, the fault mode of electric tracing element is concluded and the solution to reduce the risk of failure is proposed.