摘要
变压器纵差保护启动电流需要躲过正常运行时的不平衡电流,而不平衡电流主要由变压器有载调压分接开关挡位调节引起。当有载调压分接开关挡位调节范围大时,变压器纵差保护启动电流定值整定较高,影响了差动保护的灵敏度。文中提出通过智能变电站通用面向对象变电站事件(GOOSE)网络获取变压器调压分接开关的挡位信息,再根据调压分接开关的实际挡位自动调整纵差保护的平衡系数,消除变压器正常运行时挡位调节引起的不平衡电流。同时提出基于GOOSE网络的纵差保护整定方法,降低差动保护的启动电流和比率制动系数,并对纵差保护的动作特性进行了分析改进。实验结果表明,方案可提高变压器纵差保护的灵敏性及速动性。
For longitudinal differential protection of transformer,the starting current should avoid the influence of unbalanced current which is caused by the regulation of switch gear for on-load tap changer during the normal operation.When adjusting the wide range of switch gear,the sensitivity of differential protection would be influenced by high setting of the starting current.It is proposed that the gear position information could be obtained through the GOOSE network for the smart substation,and then the balance coefficient of the differential protection is adjusted automatically based on its actual gear position to eliminate the unbalanced current caused by gear position adjustment during the normal operation.Meanwhile,the tuning method of differential protection based on GOOSE network is proposed,which reduces the starting current and ratio restraint coefficient and improves the operation characteristics of differential protection.The simulation results show that the improved scheme can enhance the sensitivity and quickness of the differential protection of transformer.
作者
倪传坤
于同伟
邓茂军
李宝伟
胡叶宾
李旭
NI Chuankun;YU Tongwei;DENG Maojun;LI Baowei;HU Yebin;LI Xu(XJ Group Corporation,Xuchang 461000,China;Electric Power Research Institute of State Grid Liaoning Electric Power Co.Ltd.,Shenyang 110006,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2019年第6期151-156,共6页
Automation of Electric Power Systems
基金
国家电网公司科技项目(5222LK17001F)
河南省科技研发专项资助项目(184100510023)~~
关键词
智能变电站
纵差保护
GOOSE网络
挡位信息
平衡系数
灵敏度
smart substation
longitudinal differential protection
GOOSE network
gear position information
balance coefficient
sensitivity
