毕业设计110 ∕35∕10kV降压变电站电气一次系统设计外文文献原文.pdf

2008 International Conference on High Voltage Engineering and Application, Chongqing, China, November 9-13, 2008 Analysis Of Low Reactance Grounding Protection In 110KV Main Transformer Neutral System Ping shaoxun, Zhou yufang, Zhang xuefeng Rugao Electric power company Jiangs Abstract- The paper summarizes produce over voltage oscillation, for connecting winding K is 1.6 and for principle of 110KV main transformer central point and problem continuous winding K is 1.8; and ub is arrester’s residual in protect mode ，suggest has grounding protection of low voltage (or discharge voltage)at the transformer output. reactance and this method could protect main transformer in 110KV transformer substation effectively。 Its maximum happens when lightning waves invade into three-phase simultaneously. At this time, the value of over- Key words- transformer ；over-voltage ；low reactance ； voltage in nuetral point can be 1.6-1.8 times of arrester’s protection ；grounding. residual voltage in the transformer output. Regardless of I. INTRODUCTION three-phase, two-phase or single-phase being invaded, the atmosphere over-voltage is harmful to the neut