大型发电机组启动电气试验中的问题探讨

Discussion on Large Generator Unit Startup Electric Tests

在发电机启动电气试验中,要进行短路试验以检查发电机定子和转子绝缘情况。为了节省试验时间和试验费用,可以用主变高压侧短路试验代替发电机机端短路试验。在发电机空载试验时不能做定子匝间绝缘试验,防止损伤定子绝缘。同时,在发电机启动过程中,必须对机组的重要继电保护进行校验,以确保正确发挥保护的功能。

Short-circuit tests must be performed to check stator and rotor insulation during generator startup electric test. To save time and cost, generator side short-circuit test can be replaced by main transformer high voltage side short-eirouit test. During generator idle loaded tests, stator winding turn-to-turn insulation tests are forbidden to avoid damaging stator insulation. In the mean time, during startup, crucial relays must be checked to ensure proper functioning.