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MRD-XHP series arc suppression coil of slope type and automatic tracking compensation is mainly applied in power system of 6KV to 66KV with neutral point non-grounding. It could automatically track and measure system capacitance and current during normal operation of power grid system, auto-active optimum compensation when single-phase grounding fault happens to system limiting residual current less than 5A and withdraw compensation status automatically when grounding fault is eliminated. The device could compensate as per compenstaion value and status setted by user, effectively restrain overvoltage danger if arc grounding and prevent faults likes interphase short-circuit and calble blasting etc. It is mainly used in large manufactures, mine digging enterprises and medium voltage distribution system.