一点接地及四极开关

Single- point Earthing and Four-pole Switch

一点接地及四极开关均是治理杂散电流、杂散电磁干扰的措施,介绍"一点接地"及"四极开关"治理杂散电流的机理,提出:应优先选用"一点接地";当变配电所与发电机房相距远采用"四极开关"时,应加强维护管理将"断零"的可能降到最低;有条件时可选用高压发电机组与市电进行切换;提示注意"一点接地"与PE线接地的区别。

Single-point earthing and four-pole switch are both measures to eliminate stray current and electromagnetic interference. This article introduces the mechanism of ＂ single-point earthing＂ and ＂four- pole switch＂ to control stray current, and puts forward the following ideas： ＂single-point earthing＂ is preferred; when ＂four-pole switch＂ is adopted due to long distance from substation and distribution station to generator room, maintenance needs to be reinforced to minimize the possibility of ＂faulted neutral line＂; high-voltage generator set, if available, can be adopted to switch with mains supply; attention should be paid to differentiate ＂single-point earthing＂ from PE conductor earthing.