Based on the current-rising-rate protection and currentincrement protection, the principle of DDL protection as well as its action equation is presented.
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 currentincrement method to select faulty line.
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。
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The script associated with the probe is to increment the count variable, then to emit a message that defines the number of times the call has been made and the PID for the current invocation.