切除空载LF炉变压器过电压的研究

Research on Overvoltage in Cutting Off No-load Transformer in Ladle Furnace

电力系统过电压是影响电网系统安全有效运行一个重要因素,其中切除空载变压器过电压是很常见的一种,且其最大过电压能达到额定电压的5倍以上,对变压器的正常工作和线路的绝缘产生很大危害。从切空变过电压的理论推导、ATP-EMPT仿真、变压器工作状态对过电压的影响、限制切空变过电压措施等方面对武钢LF炉变压器切空变过电压进行了全面分析,并分析了现场事故的原因。

Overvoltage is an important factor which has a great influence on the security of power system.The overvoltage in cutting off no-load transformer is a common type,and the highest overvoltage can reach more than five times as much as the rated voltage,which does great harm to the work of transformer and line insulation.This article contains the theoretical deducing of overvoltage,ATP-EMPT simulation,the influence that different work states of transformer have on overvoltage and measures of restricting overvoltage in order to makes a comprehensive analysis of the transformer in wisco LF.The cause of the field accident is also analyzed.