超高压变电站监控系统

Supervision and control system for extra-high voltage substation

500kV及以上超高压变电站监控系统均采用基于现场总线或计算机局域网技术开发的开放式分层分布体系结构。监控系统的配置更加合理,数据传输分为间隔层和变电站层2层设备结构,是超高压变电站监控系统的主流方案。论述了超高压变电站的保护信息管理子站的设备配置以及和计算机监控系统的关系,计算机监控与保护信息管理子站分工更加明确。理想的对时方案是配置一套独立的全球定位系统(GPS)卫星同步时钟实现超高压变电站内计算机监控系统、保护装置及故障录波等设备的时间同步。提出五防闭锁双重化的概念,保证后台、间隔层、就地3种操作方式的可靠电气防误闭锁。超高压变电站监控系统信息交换方式更加多样化,通信接口采用以太网。传输速度更快,为无人值班站的通信提供了保障。

Present supervision and control systems for 500 kV and above substations adopt hie-rarchical and distributed structure based on fieldbus or LAN. To make the system configuration more rational,two-level（i.e, bay level and substation level） architecture for data transmission becomes its main scheme. The equipment configuration of the protective information management subsystem in extra-high voltage substation and its relation with the supervision and control system are discussed, which makes the task division more clear. The ideal clock subsystem is designed with a set of independent GPS（Global Position System） to synchronize the supervision and control system,protec-tion devices and fault recorders. The redundancy configuration of “five prevention” blocking is presented, which ensures more reliable electrical error-prevention blocking for all substation level, bay level and local operation modes. With Ethernet interface,the diverse data exchange modes and fast transmission speed guarantee the implementation of unmanned substation.