Arc furnace is a typical unbalanced impact load. It pours a great deal of negativesequencecomponent to power system, so measures shou ld be taken to compensate the arc furnace load.
电弧炉是一种严重的不对称冲击负载，它将产生大量的负序分量而污染电网，所以需要对其进行平衡化补偿。
2
The scheme includes the transverse differential protection, the directional relay action on negativesequence power of fault component and the incomplete differential protection.
该方案包括了横差保护、故障分量负序功率方向保护和不完全纵差保护的综合应用。
3
Based on the symmetry component theory, a method of the motor protection is presented by measuring positive, negative and zero sequence current component.