单相断线和两相断线是三相电网中最常见的两种故障，占纵向不对称故障的绝大多数。

Single phase broken line and two-phase broken line are two faults easy too see in power system, which account more in all broken line fault.

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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。

Arc furnace is a typical unbalanced impact load. It pours a great deal of negative sequence component to power system, so measures shou ld be taken to compensate the arc furnace load.

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本文将井下供电网路多种故障归结为“电流不对称”现象，以其作为保护动作的反映源。

Paper sums up various faults occurring in underground power network as a phenomenon of current unsymmetry, by the display of which the protection is thereby activated.

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