为防止故障，系统中的所有部件都应该具有低vswr。
To prevent problems, all components in the system should have low VSWR.
随着同步发电机组容量的增加，为防止发电机内部故障扩大，对发电机的灭磁系统提出了更高的要求。
Along with the synchronization power set capacity increasing, for prevent the generator interior breakdown from expanding, the generator has a higher request to the de-excitation system.
为防止在电流过零点附近发生的接地故障时的暂态量太小，论文提出利用电流增量进行故障选线。
When grounding fault happens at the time when current is zero, the transient value is too small, in order to prevent it, the paper brings forward the current increment method to select faulty line.
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