小水电站的调速器油泵、空气压缩机和集水井排水泵在油气水泄漏较严重时,启动十分频繁,因而其交流接触器往往产生以下问题:(1)接触器的触头易被电弧烧坏;(2)当一相触头烧坏引起断路或接触不良时,会造成电动机断相运行而损坏。上述情况不但增加维修费用,而且影响机组安全运行。如广西 Governor pumps, air compressors and sump drainage pumps for small hydropower stations start very frequently when oil-gas water leaks are more serious, so their AC contactor often has the following problems: (1) The contacts of the contactor are easily burned by electric arc Bad; (2) When one phase contact burnout caused by open circuit or poor contact, it will cause the motor to open phase damage. These circumstances not only increase maintenance costs, but also affect the safe operation of the unit. Such as Guangxi