摘要
研究了基于相关分析的暂态电流差动保护的原理与性能。首先从它既具有比幅功能 ,又具有比相作用的角度阐述了这种新型电流差动保护的原理 ,并讨论了该保护的动作判据的积分区间为 1周期时 ,它与常规电流差动保护是等价的 ;当积分区间为半个周期时 ,两者也存在类似的等价关系。在此基础上论述了新型电流差动保护的自适应性、快速性、灵敏性、选择性和可靠性。
In this paper, the principle and performance of the new type of transient current differential protection based on correlation analysis are investigated. The principle of the transient current differential protection, in which the amplitude and phase of current are compared, is analyzed at a new viewpoint. The comparative research of the principle adopted by the new type current differential protection and the conventional one is carried out, the comparison shows that there is a close relation between transient current differential protection and the conventional protection, the two protections are equivalent when the upper integration limit of action criteria of the presented protection is a whole period; for same reason, the similar equivalent relation between the two protections when the upper integration limit of action criteria of the presented protection is a half period. The presented protection is of following advantages: (1) better self\|adaptability; (2) better integrated performance from balancing among reliability, selectivity, sensitivity and rapidity; (3) ability of withstanding both the influences of saturation of CT, and the transient process caused by system disturbance.
出处
《电网技术》
EI
CSCD
北大核心
2000年第4期40-42,共3页
Power System Technology
关键词
电力系统
电流差动保护
继电保护
电网
protective principle
current differential protection
transmission line
