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其基本保护采用零序过电压保护，动作时间采用反时限特性；
The inverse time delay characteristic is adopted by the basic zero-sequence over-voltage protection.
该保护装置自具电源，基于热量累积原理实现快速高精度相电流反时限保护方法，实现对相电流和零序电流三段式保护。
The power of the protector is supplied by itself from the ct. Based on thermal cumulate principles, a rapid and high precision inverse-time phase-sequence over-current protection is implemented.
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