同杆并架双回线保护中的距离保护

Distance protection of double-circuit lines on the same pole

距离保护应用于同杆并架双回线时其动作性能会受线间零序互感的影响。为此,分析了在同杆并架双回线上发生接地故障时距离继电器的性能,以及在跨线不接地故障时距离继电器测量阻抗的规律,提出在距离继电器动作方程中加本线零序电流补偿,可以改善距离继电器的性能,尤其适用于同杆并架双回线的超范围纵联距离保护。

When applied to double-circuit lines on the same pole （DLSP）, the performance of conventional distance relays is adversely affected by the mutual coupling effect between the lines. This paper analyses the performance of the distance relay when earth faults take place on DLSP, the varying rule of measuring impedance of the distance relay when a phase-to-phase fault between two lines occurs. It is indicated that using own zero-sequence current corrlpensation method in conventional distance relay can enhance the performance of the distance relay, which is especially suitable for over-reaching pilot distance protection of DLSP.