系统中大部分电压跌落由故障引起，快速可靠地判断并切除故障是继电保护的主要职责。
Main duties of relay protection are correctly and quickly judging and clearing system faults, which greatly derive voltage sags in a distribution system.
高频保护对于高压线路的正常运行起着极其重要的作用，它可以快速切除故障，保障系统的稳定。
Carrier protection has been playing a very important role in normal operation of HV transmission line. It can cut-off the fault quickly to ensure the system operating stably.
在区内故障时可靠动作，快速切除故障。目前，该方法已成功应用于基于32位DSP的数字式光纤电流差动保护装置。
It ensures both sensitivity for internal faults and reliability for external faults, which is successfully applied in digital fiber current differential protection with 32 - bit DSP.
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