LOCKOUT继电器在特高压直流工程二次回路中的应用研究

Application and Research of LOCKOUT Relay Used in Secondary Circuit of UHVDC Project

由于巴西当地电网运行维护习惯不同,巴西美丽山二期±800 kV特高压直流工程交流系统二次回路中的LOCKOUT继电器与中国工程的应用和配置原则存在较大的差别。详细分析和比较了巴西与中国特高压换流站交流系统典型的断路器操作回路的差异性,提出了适用于巴西当地电网运行维护要求的特高压换流站交流系统二次回路中LOCKOUT继电器的配置原则。并以欣古换流站交流滤波器小组断路器的操作回路为例,详细介绍了LOCKOUT继电器的启动和闭锁逻辑。所提出的LOCKOUT继电器的配置原则有利于更好地适应巴西当地的电网建设,为特高压直流输电技术走出国门、服务世界提供了强有力的技术支撑。

Due to the different operation and maintenance habits of power grid in Brazil,the LOCKOUT relay used in circuit-breaker secondary circuit of Belo MountainⅡ±800 kV UHVDC project is different from its application and configuration principles of power grid in China.The differences between Brazil and China about the typical circuit-breaker operation circuit in AC system of UHVDC project are analyzed and compared.Then,the configuration principle for LOCKOUT relay of the circuit-breaker operation circuit in AC system of UHVDC project is put forward,which can meet the operation and maintenance requirements in Brazil.Moreover,taking the circuit-breaker operation circuit in Xingu converter station for example,the start-up and locking logic of LOCKOUT relay are introduced in detail.The proposed configuration principle for LOCKOUT relay is adapted to the construction of power grid in Brazil,and provides a support for the Chinese UHVDC technology to go abroad and service the"Belt and Road"countries.