广东电力Issue(2)：65-69,5.DOI:10.3969/j.issn.1007-290X.2014.02.014
3/2接线电流互感器断线快速闭锁母差判据的研究
Study on Rapid Interlock Busbar Differential Criterion for 3/2 Wiring CT Break Line
郑茂然 1曾铁军 2唐亚男 3苏泽光2
作者信息
- 1. 中国南方电网电力调度控制中心，广东 广州 510603
- 2. 南华大学 电气工程学院，湖南 衡阳 421001
- 3. 武汉大学 信息学部，湖北 武汉430079
- 折叠
摘要
Abstract
Circuits of northwestern power grid are long with few branches and busbar for practical operation of 3/2 wiring system are few,too.When current transformer break line and short circuit fault happening in succession within 5 seconds, for reason of 5 seconds delay,break line slow interlock differential criterion is not able to cause CT break line interlock which may result in differential misfunction.Aiming at the above problem,this paper analyzes typical characteristic of CT break line and proposes to take difference streak rise and braking current decrease as criterion for rapid interlock busbar dif-ferential protection for 3/2 breaker wiring CT break line.In addition,it proposes three conditions of the criterion and reali-zation ways.Simulation verification indicates that this criterion is able to effectively identify CT break line at the same time of not affecting rapidity of differential protection,and then it is able to interlock bus differential protection.By several times of testing and verification,it proves that the criterion is able to act correctly and used for current differential protec-tion such as traditional and after-digital double-bus wiring differential protection,transformer differential protection and generator differential protection.关键词
电流互感器断线/3/2 接线/母线差动保护/快速闭锁Key words
CT break line/3/2 wiring/busbar differential protection/rapid interlock分类
信息技术与安全科学引用本文复制引用
郑茂然,曾铁军,唐亚男,苏泽光..3/2接线电流互感器断线快速闭锁母差判据的研究[J].广东电力,2014,(2):65-69,5.
