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建筑工程的许多施工现场都备有内燃发电机组，以便在电网停电时发电自用，备有发电机的单位习惯于将发电机中性点与电网零线相接，以消除不平衡负载的零序电流和防止发电机过电压。这样连接后，在正常情况下，对电网影响不大；但当发电机线路三相不平衡或一相接地，且故障接地
Many construction sites are equipped with internal combustion generating set at the construction site in order to generate electricity for use in the event of a power outage. Units equipped with generators are used to connect the neutral point of the generator to the neutral line of the power grid to eliminate the zero sequence of the unbalanced load Current and generator overvoltage protection. This connection, under normal circumstances, the impact on the power grid is not; but when the generator circuit three-phase unbalanced or one phase, and fault ground