To satisfy this increasing demand the capacity of individual generators is larger and larger (1300 MW unit are in service), the transmission voltage is higher and higher, and more complex power systems have been built.

• 为满足此日益增长的电力需求,单台发电机组的容量越来越大(1300mw发电机已运行),输电电压越来越高,建造的电力系统更为复杂。