基于故障分量的相位相关电流差动保护  

Phase Correlation Current Differential Protection Based on Fault Component

作　　者：李斌[1] 曾红艳[1] 范瑞卿[1] 薄志谦[2,3] 

机构地区：[1]天津大学电力系统仿真控制教育部重点实验室,天津市300072 [2]英国AREVA输配电自动化公司,斯塔福德郡STl74LX,英国 [3]电力系统国家重点实验室,清华大学电机系,北京市100084

出　　处：《电力系统自动化》2011年第3期54-58,共5页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB219704);国家高技术研究发展计划(863计划)资助项目(2007AA05Z241);国家自然科学基金资助项目(50977061)~~

摘　　要：基于基尔霍夫电流定律的电流差动保护作为电力系统中各种设备的主保护得到广泛应用。鉴于负荷电流的影响,故障分量的差动保护在消除负荷电流影响、提高抗过渡电阻能力方面具有明显的优越性。分析了差动两侧故障分量电流的幅值和相位特征,提出了基于故障分量的相位相关电流差动保护原理。与传统比率差动保护、标积制动的差动保护在复数平面上进行了比较,理论证明了新原理能够同时保障外部故障可靠性和内部故障灵敏性,并就电流互感器饱和情况下对差动保护的影响进行了分析比较。理论分析和仿真验证证明了新原理优良的动作性能。Current differential protection（DP） based on Kirchhoffs current law is widely used as a main protection for various power system devices.Due to influence of load current,fault component based current DP has distinct advantages on removing load current influence and enhancing ability to endure transient resistance.The amplitude and phase characteristics of two-terminal fault currents are analyzed and the principle of phase correlation current DP based on fault component is proposed.The differential principle among proposed protection,conventional percentage DP and product-restraint DP is compared.Analysis results show the proposed principle is able to guarantee reliability of external fault and sensitivity of internal fault as well.And influence of current transformer saturation on DP is also analyzed.Finally,theoretical analysis and simulation tests demonstrate that the principle proposed has good operation performance.

关 键 词：电流差动保护 电流相位差 电流互感器饱和 过渡电阻 

分 类 号：TM772[电气工程—电力系统及自动化]