发电厂低压柴油发电机配电系统短路电流计算

Short-circuit Current Calculation of LV Diesel Generator Distribution System for Power Plant

简述发电厂保安电源切换过程,明确保安母线段并联切换时发生短路。短路电流由柴油发电机系统短路电流、厂用电系统短路电流和电动机反馈电流组成,其较厂内其他电动机控制中心更大。此外,提出了发电厂低压柴油发电机配电系统短路电流计算方法,结合工程实例进行低压柴油发电机配电系统短路电流计算,并将其作为开关设备选型的依据。

Firstly,the process of power plant emergency power supply switching was briefly described.It was clear that a short circuit occurs when the incoming powers of the emergency bus are switched in parallel.The shortcircuit current is composed of the short circuit current of the diesel generator system,the short-circuit current of the auxiliary power system and the motor feedback current.The short-circuit current of the emergency bus is more than the ordinary motor control center.In this paper,the short-circuit current calculation method of the low-voltage diesel generator distribution system of the power plant was proposed,and the short-circuit current calculation of the lowvoltage diesel generator distribution system was combined with project examples and used as the basis for the selection of switching equipment.