摘要
针对地区电网中某110kV变电站1号主变压器(简称主变)中压侧发生近区故障时抗短路电流能力不足的问题,提出并研究在该主变中压侧加装零损耗深度限流装置的限流技术。阐述了零损耗深度限流装置的工作原理;依据网架结构通过等值链路的短路计算,给出了零损耗深度限流装置参数配置;探讨了加装零损耗深度限流装置后对系统运行的影响,并给出了解决对策;最后对深度限流装置的限流效果进行了评价。研究结果表明,配置的深度限流装置能有效地保证1号主变的安全运行及限制短路电流的要求,同时研究结果可为今后深度限流装置的工程应用提供有效参考。
In order to solve the short-circuit current capacity shortage in the near-field fault on the medium voltage side of a 110 kV substation in a local power grid,the current limiting technology of the zero-loss depth current limiting device is added to the medium-voltage side of the main transformer.The working principle of the zero loss copious short-circuit current limiting device is described;based on the short-circuit calculation of the equivalent network,the parameter configuration of the zero loss copious short-circuit current limiting device is given;the influence on the operation of the system after the zero loss copious short-circuit current limiting device is installed is discussed,and countermeasures are given;finally the current limiting effects of the zero-loss copious short-circuit current limiting device is evaluated.The research results show that the zero loss copious short-circuit current limiting device configured can effectively guarantee the safe operation of No.1 main transformer and limit the short-circuit current.Meanwhile,the research results can provide the effective reference for engineering applications of the zero loss copious short-circuit current limiting device in the future.
作者
杜严行
王静萍
吕琨璐
李小伟
鲁璐
DU Yanxing;WANG Jingping;LüKunlu;LI Xiaowei;LU Lu(State Grid Ningxia Electric Power Company Ningdong Power Supply Company,Yinchuan 750411,China)
出处
《供用电》
2018年第7期49-53,66,共6页
Distribution & Utilization
关键词
近区故障
短路电流
深度限流装置
电抗取值
继电保护
close-in fault
short-circuirt
copious short-circuit current limiting device
reactance value selection
relay protection
