中性点不接地系统电压互感器一次侧中性点接地方式分析

Analysis of Neutral Grounding Mode of Primary Side of Voltage Transformer in Neutral Ungrounded System

对中性点不接地系统常用的三相五柱式电压互感器及三相三柱式电压互感器的一次绕组中性点接地方式进行了较为详细地分析,说明了三相五柱式电压互感器一次侧中性点漏接地造成电气设备不能正常工作的原因,另外说明了三相三柱式电压互感器一次侧中性点误接地可能导致的互感器绕组过热而被烧毁的原因。

The neutral point grounding method of the primary winding of the three-phases five-pillars voltage transformer and the three-phases three-pillars voltage transformer commonly used in neutral ungrounded systems is analyzed in detail. The paper explains the reason that the electrical equipment cannot work normally due to the ungrounded neutral point of the primary side of the three-phases five-pillars voltage transformer. In addition, the reason causing the voltage transformer winding to be overheated and be burned due to the wrongly grounded neutral point of the primary winding of the three-phases three-pillars voltage transformer is explained.