上海电网35kV真空断路器的选用及保护方式

Vacuum breaker selection in 35 kV Shanghai Power Network

通过对上海电网35kV系统断路器的运用回顾,以及真空断路器使用特性的阐述,提出在上海电网35kV系统中选用真空断路器的可行性。通过EMTP电磁暂态程序对系统运用最新开发的真空断路器计算模型(综合了西门子3AH型和ABB的VD4型真空断路器的各类表征参数),分别在真空开关投切空变、空载电缆、站用变、接地变等工况下进行了详细计算,并结合现场的论证试验,得出在上海电网35kV系统中正确使用真空断路器的技术原则,同时研制出了限制35kV系统相间、相地过电压用的三相组合式无间隙氧化锌避雷器保护装置。

This paper introduced the history in circuit breaker application and vacuum breaker characteristic and proposed the feasibility of selection vacuum breaker in 35kV Shanghai Power Systems. Based on all-around analyses of vacuum breaker properties, using newly-developed vacuum breaker computational model by EMTP (adopting Siemens 3AH-VD4 and ABB-VD4 type vacuum breaker characteristic parameters), detail calculations have been carried out under closing and opening of no-load transformers, no-load cables, station transformers and grounding transformers respectively; and incorporated field argumentative tests, it has been obtained correct technical principle in vacuum breaker use. Meanwhile it has been developed three phase combined gapless arrester protection apparatus to limit overvoltages between phases and between phases to ground in 35kV power systems.