摘要
特高压并联电容器规模庞大,元件数量众多,各元件工作条件和工作环境存在明显差异。环境条件可改变电容器自身参数,进而影响桥差保护的可靠性与灵敏性。在现行双桥差不平衡电流保护的基础上,对温度因素的影响进行深入讨论。通过理论分析,得到考虑温度因素的不平衡电流值计算方法,并进行简化处理,制定出切实可行的保护整定方案。根据实际工程参数,利用PSCAD搭建仿真模型并对所提方法进行论证,具有理论价值和实际工程意义。
There are a large number of capacitor units within a capacitor bank. The working environment is obvious different among these units. The capacitance values can be influenced by temperature, thus affecting the unbalance current protection＇s reliability and sensitivity. The influence of temperature is discussed, which is based on double-bridge unbalance current protection. The theoretical analysis is carried out, and the calculation formula of the unbalance current due to temperature variation is obtained. The work in this paper also contains the simplification of the theory and practical protection setting scheme. The results are demonstrated by simulation with PSCAD. This method has important value both on theory and practical application.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2016年第22期77-83,共7页
Power System Protection and Control
基金
国家自然科学基金项目(51277009)~~
关键词
外界因素
温度
内熔丝
双桥差不平衡电流保护
并联电容器组
整定计算
external factors
temperature
internal fuse
double-bridge unbalance current protection
shunt capacitor
setting calculation
