...ault, zero-sequence energy , energy variation . [gap=137]关键词： 关键词：小电流接地电网，间歇性电弧接地故障，零序能量，能量变化。
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Zero-sequence transient energy is calculated for low earthing resistance and single-phase transient energy for high earthing resistance.
并且根据接地电阻的大小选择不同的暂态能量算式，故可判断金属性接地故障和高接地电阻接地故障。
Measure function: can measure current, voltage, active power, reactive power, frequency, zero sequence current, electric energy, 2 pulse inputs implement watt-hour meter auto read;
测量功能：高精度测量电流电压、P、Q、功率因数、频率、零序电流、计算电度；2路脉冲量输入实现外部电度表自动抄表；
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