因为按目前的负荷水平来说，一般的城市都有几千台配电变压器和箱式变压器。
Because according to the current load level a city has generally thousands of distribution transformer and box transformer.
用单回一次受电设施和单台配电变压器供给所有的馈电线路。
A single primary service and distribution transformer supply all the feeders.
用单回一次受电设施和单台配电变压器供给所有的馈电线路。
A single primary service and distribution transformer supply all the feeders.
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