相位相关电流差动保护新原理  

A Novel Principle of Phase Related Current Differential Protection

作　　者：李斌[1] 范瑞卿[1] 于绚[1] 贺家李[1] 薛士敏[1] 

机构地区：[1]电力系统仿真控制教育部重点实验室(天津大学),天津市南开区300072

出　　处：《中国电机工程学报》2011年第7期96-101,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB219700);国家863高技术基金项目(2007AA05Z241);国家自然科学基金项目(50607014;50977061)~~

摘　　要：在保证区外故障时的差动保护安全性的前提下,为了提高保护的灵敏度,具有比率制动特性的差动保护在电力系统中的各种设备上作为主保护得到广泛应用。针对比率差动保护制动系数在内部故障灵敏度与外部故障安全性方面的矛盾,提出了一种相位相关电流差动保护新原理,该原理将差动两侧的电流相位差引入判据,使得区内、外故障情况下制动项分别体现为驱动和制动2种状态,从而提高了差动保护的灵敏性和可靠性。同时,差动保护新原理在抗电流互感器饱和问题上也具有明显的优越性。In order to improve protection sensitivity, percentage restraint differential protection has been widely used as the main protection for a variety of power system equipment under the premise of ensuring differential protection security. Considering the contradiction between the sensitivity for internal fault and the security for external fault, a novel principle of phase related current differential protection was proposed. Based on this principle, current phase difference was introduced as a criterion, so restraint unit of protection can take the role of drive or restraint in the case of internal or external faults. Therefore, the sensitivity and the reliability of differential protection can be improved simultaneously. Furthermore, the proposed differential protection has the distinct advantage on restricting the influence of current transformer saturation.

关 键 词：电力系统 相位相关电流差动保护 比率制动 电流互感器饱和 可靠性 灵敏性 

分 类 号：TM772[电气工程—电力系统及自动化]