But under fault condition, the system current is greater than the current of equivalent AC current source and the limiting resistance take effect immediately.
故障后，系统电流值远大于等效交流电流源值，限流电阻立刻自动投入限流。
The QSS (Quasi Steady State) model of converter which neglects the negative impedance of DC system will bring some errors when unbalanced fault occurs in AC system.
当交流系统发生三相不对称故障时，忽略直流系统负序分量的准稳态模型将给交直流混合系统的仿真带来较大的误差。
They provide system security and immediate reliable low level ground fault detection on three-phase AC resistance grounded or grounded electrical distribution systems.
此类继电器能够增加系统安全性，并对三相交流接地电阻或接地配电系统进行可靠的低级接地故障检测。
AC fault security power source system is to provide alternating current for unit safety shutdown when power cut happens for a long time due to power grid failure or other reasons.
交流事故保安电源系统是当电网发生事故或其他原因致使火电厂厂用电长时间停电时，提供机组安全停机所必需的交流用电系统。
A new excitation control strategy is proposed for the rotor side converter in an AC excited wind-power generator to allow the system to ride through the grid short-circuit fault.
提出一种电网短路故障时保持交流励磁风力发电机不脱网运行的新型励磁控制策略。
It should be noted that the DC transmission system does not contribute to the fault current flowing in the AC system5 during the AC faults.
应注意到，直流输电系统并不会增加交流系统故障时的故障电流。 收藏。
It should be noted that the DC transmission system does not contribute to the fault current flowing in the AC system5 during the AC faults.
应注意到，直流输电系统并不会增加交流系统故障时的故障电流。 收藏。
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