电网技术Issue(11)：2948-2954,7.DOI:10.13335/j.1000-3673.pst.2014.11.002
具备应对过负荷能力的距离保护实施方案
A Scheme to Implement Distance Protection Capable to Cope With Overload
摘要
Abstract
An implementation scheme for the strategy of distance protection to cope with overload is presented, in which based on the features of overload, symmetrical faults, asymmetric fault, phase-to-phase fault and single-phase earth fault those abnormal operation conditions are identified respectively. Firstly, the symmetrical faults and overload are identified by positive-sequence U1cosφ1, then the current unbalance degree is used to distinguish symmetrical faults from overload;in the second step, the fault position is recognized by positive-sequence power, the phase-to-phase faults are distinguished from overload by the criterion Uijcosφij (ij=AB,BC,CA), phase characteristics of positive sequence compensated voltage and phase compensated voltage are used to distinguish single-phase-to-ground fault from overload. Based on RTDS a simulation model is established and various types of faults such as symmetrical faults, asymmetrical faults and the faults occurred during the overload period are simulated. Simulation results show that using the proposed scheme the distance protection can be effectively locked under overload and quickly unlocked under faults, besides, the transition resistance that the proposed implementation scheme can endure reaches up to 150Ω.关键词
距离保护/过负荷电流/电压平面/正序功率/正序补偿电压/相补偿电压/Ucosφ/实施方案Key words
distance protection/overload current/voltage plane/positive sequence power/positive sequence compensated voltage/phase compensated voltage/Ucosφ/implementation scheme分类
信息技术与安全科学引用本文复制引用
周泽昕,柳焕章,王德林,杜丁香,王兴国..具备应对过负荷能力的距离保护实施方案[J].电网技术,2014,(11):2948-2954,7.基金项目
国家电网公司科技项目(适应大电网运行的继电保护应用策略及协调控制技术深化研究)。 （适应大电网运行的继电保护应用策略及协调控制技术深化研究）
