船舶中压电力系统接地方式及其原理分析

Comparison of Grounding Modes of Ship Medium Voltage Power System

为获取最佳的船舶中压电力系统中性点接地方式,对现有的船舶中压电力系统接地方式及其原理进行分析。结合船舶供电稳定性、安全性和经济性等方面的要求,通过综合考量,认为船舶中性点经大电阻接地比较适合船舶中压电力系统。以某采用中性点经大电阻接地方式的工程船为例,计算出大电阻接地时的故障电流值,确定中性点经大电阻接地时,接地电阻的阻值等参数。通过对某经大电阻接地的船舶电气系统进行分析,说明该接地方式的有效性。

Current neutral point grounding modes of ship medium voltage power system are investigated with analysis of operation principle.It is found that from the angle of comprehensive requirements for power supply stability,safety and economy,ship neutral grounding via high resistance is more suitable for ship medium voltage power system.The fault current in the grid with neutral point grounded via high resistance is calculated as an example and the value of grounding resistance and other parameters are determined.