摘要
近年来,35kV电网中真空断路器开断并联电抗器时发生了多起事故,而干式空心电抗器故障多数是匝间绝缘缺陷造成匝间短路引发的,因此干式空心电抗器匝间绝缘问题已经越来越被重视。由真空断路器分闸引起干式空心并联电抗器过电压对电抗器的匝间绝缘老化起到了至关重要的作用。基于上海某变电站实际电气主接线,构建投切35kV并联电抗器单相模型以及三相模型,并且考虑到三相模型中另外两相的工频电源对首开相产生的影响,计算由断路器分闸产生的最大截流过电压达到7.3(标么值)而同时开断三相电抗器时产生的最大截留过电压高达8.6(标么值)。
Accidents occurred frequently in the 35 kV power system in recent years when vacuum breaker switched off shunt reactors. Sufficient evidence indicates that the failure of dry type hollow reactor is mostly caused by turn-to-turn insulation defects, so this problem is becoming more and more valued. And when the vacuum circuit breaker caused overvoltage to the reactance of the turn of insulation, aging plays a vital role. Based on a transformer substation in Shanghai, the single-phase model and three-phase model of 35 KV are constructed. And considering the effect of the other two-phase power source on the first opening phase of the three-phase model, the maximum intercepting voltage generated by the circuit breaker can reach 7. 3 p. u, while the maximum interception voltage generated during the three-phase circuit breaker is as high as 8.6 p. u.
出处
《电力与能源》
2018年第1期19-23,共5页
Power & Energy
关键词
并联电抗器
分闸
三相模型
过电压
shunt reactor
split brake
three-phase model
overvoltage
