核电厂蓄电池直流系统短路电流的计算方法及其危害分析

Short-Circuit Calculation and Harzard Analysis of Battery DC System in Nuclear Power Plant

直流系统以其固有的供电连续性在核电厂运行中发挥着非常重要的作用,与交流系统相比,直流系统在短路电流计算上所应用的原理和方法上有着显著的不同。国内相关标准和文献中,对直流系统短路电流如何计算虽有描述,但并未对电流的变化曲线和故障的切除时间进行明确的描述,这对直流系统设备选型、故障影响和根本原因分析是不利的。文章参考IEEE、IEC及金属熔断特性,结合实例给出了短路电流曲线和故障切除时间的定量分析,为直流系统运行和故障分析提供支持。

DC systems play a very important role in plant operation with their inherent power supply continuity.There are significant differences between DC systems and AC systems in the application of short-circuit current calculations.At present,in relevant literatures,how to calculate the current change trend of DC system short-circuit current is relatively few,which is unfavorable for DC system equipment selection and fault analysis.In this paper,referring to IEEE,IEC and metal fusion characteristics,gives the curve of the current,and the fault resection time.And so it can provide support for DC system operation and fault analysis.