花园变、黄家寨变FA4-550型开关取消合闸电阻研究

Study of Canceling the Reclosing Resistance of FA4-550 Type Switchgear in Huayuan and Huangjiazhai Substation

FA4-550型瓷柱式开关在青海电网内运行已达19年,且大都已超过大修年限,合闸电阻包括其联动机构在运行中多次出现故障,严重影响了系统的安全稳定运行。目前,西宁供电局已对FA4-550型瓷柱式开关大修4台,并已拆除合闸电阻,运行正常。文章针对取消合闸电阻后,系统在各种运行方式下分别进行系统过电压计算,总结出取消合闸电阻对电网无影响的结论,对青海电网内FA4-550型瓷柱式开关取消合闸电阻具有指导意义。

FA4-550 type porcelain pillar type switchgear has been operated for 19 years in Qinghai power grid, and most of them have exceeded the fixed overhaul years, the reclosing resistance including its linkage devices occurred several times of fault in operation, and this seriously influenced the safe and reliable operation of system. At present, Xining power supply bureau has overhauled 4 sets of the switchgear, and has dismantled the reclosing resistance. Aiming at the situation of dismantling the reclosing resistance, calculating the overvoltage under each operating method, the paper sums up the conclusion that the cancel of the reclosing resistance have no influence on the power grid, and the paper possesses guidance for the FA4-550 type porcelain pillar switchgear dismantling the reclosing resistance in Qinghai power grid.