Watt-Hour Meter A watt-hour meter records the total power output at a specific point in a system. Typical recording increment is in kW-hours.
电度表 电度表记录系统中某一点的总电力输出，通常以千瓦时为记录单位。

Wye Connections A Wye connection is the same as a star connection. It is a method of interconnecting the phases of a three-phase system to form a configuration resembling the letter Y. A fourth (neutral) wire can be connected at the center point.
Y连接 Y连接就是星形连接，也就是把三相系统中的相按照字母Y的形状连接起来，还可以在中心点接上第四根（中性）线。