求翻译：变压器的接法：目前变压器的常用接法有Y与D两种，配电变压器也有采用Z接法。是什么意思？

Transformer connection: a common current transformer connected in Y and D are two types of distribution transformers are also used Z-connection.

The transformer of the law: the current transformers are commonly used by law with D Y two, distribution transformers are also used Z law received.

The transformer copper loss refers to the loss which at the beginning of the secondary wire DC resistance creates, therefore only needs the transformer on to add on the nominal current then, the concrete operation is the secondary coil direct pipe nipple, adds the voltage on a side, amounts to until

Transformer-connection: common method of current transformer with y and d two, distribution transformers are also used by Z.

Transformer connection: current transformer connection of y and d two kinds, distribution transformers are used by Z.