【摘要】 常用的反时限特性曲线都只是过载数学模型,只描述在过载情况下电流与动作时间之间的反时限关系,不能正确反映非过载及临界过载电流的热效应对反时限动作时间的影响。本文基于导体发热的物理模型,提出了一种适合任意负载电流的反时限过载保护算法——递推算法。更多还原

【Abstract】 The inverse time over-current protection curves in use are the mathematical models only for over-current situation.They describe the relationship between action time and over-current only,and can not reflect accurately influence on action time of the current when it is less or exactly equal to critical over current.This paper develops a recurrence algorithm—a protection algorithm of inverse time over-load for any current built upon physical model of conductor heating effect.更多还原