采样值电流差动保护一种新动作判据的研究分析

Analysis of a new action criterion for current sample value differential protection

提出了一种基于积分思想的采样值电流差动保护判据,并对该判据的设计思想、保护原理、具体判据的表达形式、消除动作模糊区影响的措施等方面进行讨论分析,该判据可以提高保护动作的速度,并且保护动作的速度可以随故障严重程度的加重而越来越快,这对于发生严重故障时要求快速切除故障是极为有利的,而对于采样值电流差动保护判据带来的保护存在模糊区的问题,可以采用常规相量电流差动保护作为辅助判据来消除。

A new action criterion for current sample value differential protection based on Integral theory are put forward. This paper studies the criterion, including design idea, principle, formula and dissolved fuzzy area. The criterion can accelerates protection to operate. Fast protection operation is very important to cut severe fault. The protection fuzzy area may be eliminated by general vector current differential protection.