反时限过流保护模型优化与曲线交叉研究  

Research of inverse time overcurrent protection model optimization and curve intection

作　　者：韦嘉[1] 柏瑜 熊兰[2] 杨子康[2] 肖波[1] 

机构地区：[1]重庆市电力公司,重庆400010 [2]重庆大学电气工程学院,重庆400030

出　　处：《电测与仪表》2015年第9期56-60,65,共6页Electrical Measurement & Instrumentation

摘　　要：反时限过流保护在我国一些电力设备以及低压电网中逐步得到应用,但是反时限过流保护在待定参数的设置和保护配合等方面整定较为复杂。针对实际使用情况,文中补充了反时限特性曲线模型的表达。考虑到现有整定优化模型存在的缺陷,在现有计算模型的基础上,通过确定优化目标权重系数,对计算模型进行适当优化,IEEE5节点计算证明新的优化模型能减少总体保护的动作时间,缩短重要线路的保护时间,加长普通线路的保护时间,提高系统的可靠性。对于配合曲线存在交叉的情况,提出一种比较简单的处理方法,为后续研究提供计算和编程的思路。Inverse time overcurrent is applied in low voltage power grid gradually .But the undetermined parameter setting is complex .The model of inverse time characteristic curve is elaborated .Considering the defects exsisting in the optimization model , and based on the exsisting model , a new model for calculation is proposed through the weight coefficient .The IEEE calculation is used to prove the model is useful in reducing the actuation time of the overall pro-tection, the protection time of the key circuit , increasing the protection time of common circuit and the reliability of the system .In the case of curve crossing , a simple approach to help computing and programming for further study is proposed at last .

关 键 词：反时限 过流保护 整定模型 曲线交叉 

分 类 号：TM772[电气工程—电力系统及自动化]