摘要
常规反时限过电流保护广泛应用于配电网中。由于整定计算方法的要求,在最小运行方式下,靠近电源的保护动作延时通常较长,速动性差。因此,该文提出一种采用测量阻抗作为加速因子的低阻抗加速反时限过电流保护。对于区内短路,可以有效减小动作延时;对于区外短路,可以保证上下级保护的配合关系。通过仿真分析验证了所提保护原理及其在含有分布式电源配电网中动作的正确性。
The conventional inverse-time over-current protection is used in power distribution system widely.Due to the requirement of setting calculation method,the protection action time near the power supply is usually longer and can not guarantee the speed in minimum operation mode.Therefore,this paper presents the inverse-time over-current protection with low-impedance acceleration,for the fault in protection area,can effectively improve the action speed;for the fault out of the protection area,can ensure the coordination of the upper and lower protections.Through the simulation analysis of the distribution system,the correctness of the proposed protection principle is verified,and the correctness of the action in the distribution system with distributed generator is simulated and analyzed.
作者
刘玉娟
卫志农
孙国强
张伟
LIU Yujuan;WEI Zhinong;SUN Guoqiang;ZHANG Wei(College of Energy and Electrical Engineering,Hohai University,Nanjing 210098,Jiangsu Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2019年第9期3424-3431,共8页
Power System Technology
基金
国家自然科学基金(71503136)~~
关键词
反时限过电流保护
分布式电源
动作延时
低阻抗加速因子
inverse-time over-current protection
distributed generator
action time
low impedance acceleration factor
