小电源接入系统后陕西北部电网远方跳闸改造方案的设计

Improvement Plan of Distance Tripping in the Northern Network of Shaanxi After Small Source Put-in

陕西北部电网结构是以单电源辐射方式 ,由系统经 330kV金锁变———黄陵变———延安变———榆林变供电 ,在榆林变经 10 0多公里 110kV长线路与榆林地区神华电厂小电源并网 ,由于这 4个330kV变电站均为角型接线 ,且运行方式不允许神华小电源单独带 330kV电网运行 ,即当金锁变系统主供电源断开时 ,同时也要求榆林变必须与神华电厂解列 ,故必须对金—黄—延—榆线路进行改造设计。

Small source from Shenhua Power Station in Yulin is connected to the northern power network of Shaanxi by 110kV lines with Jinsuo Substation - Huangling Substation - Yan'an substation - Yulin substation. Because these four 330kV substations are all delta-shape wire connected, the power network doesn't operate when the small source from Shenhua Power Plant is lonely put in with network. Therefore improvements are made for the design of distance tripping for every 330kV substation. The design thinking and requirement for the improvement plan can be used as reference for the other similar system.