At 400 kilovolts, a standard value for long-distance transmission, an alternating current 30 metres (100 feet) from the ground has a fortieth of the loss of a similar cable at ground level.
At 400 kilovolts, a standard value for long-distance transmission, an alternating current 30 metres (100 feet) from the ground has a fortieth of the loss of a similar cable at ground level.
在远距离传输的标准电压400千伏下，电缆离地30米（100英尺）时的电量损耗是同样电缆在地面时损耗的四十分之一。