220kV馈供线路接地距离保护零序补偿系数选择

Selection of Zero-sequence Compensation Coefficient for Grounding-fault Distance Protection of 220 kV Feeders

根据线路接地距离保护中的零序补偿系数的常规计算方法,推导了220 kV馈供线路接地距离保护中的零序补偿系数,分析了零序补偿系数对接地距离保护测量阻抗的影响。通过对实例的定量计算,提出了对220kV馈供线路接地距离保护中零序补偿系数整定计算时应考虑支接变压器阻抗的影响。

According to conventional calculation of zero-sequence compensation coefficient for grounding-fault distance protection, the paper derives the zero-sequence compensation coefficient for grounding-fault distance protection of 220 kV feeders, analyzes the impact of zero-sequence compensation coefficient on the measuring impedance of grounding-fault distance protection. Based on the calculation of an example, the paper suggests that it should take the transformer impedance into consideration during the calculation of zero-sequence compensation coefficient for grounding-fault distance protection of 220 kV feeders.