一般由短路引起的功率变化量ΔS ["A.2%","B.5%","C.10%","D.15%"]
160km/h以上区段的线岔定位拉出值不大于()。 ["350mm","375mm","400mm","450mm"]
缓冲装置的调节参数有哪些?
道岔开口方向上,道岔定位后应保证两线接触悬挂的任一接触线分别与相邻线路中心的距离不小于()处。 ["1200mm","1220mm","1240mm","1250mm"]
变电所计算负荷为300kW,功率因数为0.75,要使功率因数达到0.9,则需要补偿无功容量为()kVar。 ["A.45","B.90","C.119","D.231"]
什么是水轮发电机组的自调节作用?