These are stepped up to the transmission voltage level, and power is transmitted to transmission substations where the voltages are stepped down to the subtransmission level (typically, 69 to 138 kV).
这些都加大了对传输的电压水平，并且动力被传递给传输站，其中的电压呈阶梯状下降到变速级(通常为69到138千伏)。
In 1949, the largest thermal power unit of China was 10 MW and the highest transmission voltage was 220 kV, all designed and made by foreign countries.
1949年我国火电最大机组为1万千瓦，输电电压等级最高为220千伏，且全部为外国设计制造。
In 1949, the largest thermal power unit of China was 10 MW and the highest transmission voltage was 220 kV, all designed and made by foreign countries.
1949年我国火电最大机组为1万千瓦，输电电压等级最高为220千伏，且全部为外国设计制造。
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