基于分布参数模型的特离压双回线路故障分量接地距离保护

Fault Component Ground Distance Protection for UHV Double-circuit Transmission Line Based on Distributed Parameter Model

特高压交流同杆双回输电线路分布电容大、传输距离远,呈显著的分布参数特性,传统距离元件应用于特高压双回线路时存在原理性缺陷。基于分布参数模型和六序分量法,理论分析和推导了新的特高压双回线路单相接地距离元件测量阻抗的计算表达式,并且应用到故障分量距离继电器中。EMTP仿真验证了新的距离保护算法在特高压双回长线路上应用的正确性与有效性。

UHV AC double-circuit transmission line is of large distributed capacitance and long transmission distance and shows distinct characteristics of distributed parameters. The traditional distance relay has inherent defect when using in UHV double-circuit transmission line. According to distributed parameter model and six sequence component, this paper analyzes and deduces a novel calculation formula for the measured impedance of single phase ground distance relay for UHV double-circuit transmission line and uses it in fault component distance relay. EMTP simulation verifies the validity and reliability of the proposed novel distance protection scheme for UHV double-circuit long transmission line.