高温超导电缆分相电流差动保护的电容电流补偿方案

A Capacitance Current Compensation Method of Phase-Splitting Differential Current Protection for High Temperature Superconducting Power Cable

分析了高温超导电缆的电气参数特点,讨论了将架空线路差动保护中的电流补偿方案直接应用于高温超导电缆线路的可行性,对无电容电流补偿、电容电流半补偿、基于贝瑞隆模型等不同差动保护方案的动作性能进行了仿真分析。结果表明,在高温超导电缆分相电流差动保护方案中必须考虑电容补偿;基于贝瑞隆模型的电流差动保护性能优越,耐过渡电阻能力强,能够满足高温超导电缆线路分相电流差动保护的应用要求。

Comparing with overhead line and normal power cable, the high temperature superconducting （HTS） power cable possesses the feature of resistance closed to zero and large distributed capacitance, such a property of HTS cable affects the protective relaying for it. In this paper based on the analysis on this feature, the feasibility of directly applying the current compensation scheme in differential protection for overhead lines to HTS power cable is researched. The action performances of different differential protection schemes, in which the capacitance current is not compensated, half-compensated or the protection is based on Bergeron model, are simulated. Simulation results show that it is necessary to consider capacitance current compensation in the phase-splitting current differential protection scheme for HTS power cable; the current differential protection based on Bergeron model possesses superior performance and strong ability to withstand transition resistance, so it can satisfy the application demand of phase-splitting current differential protection scheme for HTS power cable.