Abstract:

The design schemes of the quench protection system of the EAST poloidal field power supply (PFPS) are given. The detailed descriptions of structure of two stages commutating current and its operated principle are introduced, which are applied to two quench protection breakers——the direct current circuit breaker (DCCB) and the explosively operated circuit breaker (EOCB). The regulation of the commutating current of the structure is analyzed，the structure resolves the problem of large current interruption effectively. The simulation results show that the quench protection system meets the requirements of design.

Key words: Quench protection, Direct current circuit breaker (DCCB), Explosively operated circuit breaker (EOCB), Structure of two stages commutating current

摘要：

给出了EAST极向场磁体电源失超保护系统的设计方案，描述了两种失超保护开关——直流快速开关和爆炸开关采用的两级换流结构的设计和工作原理，分析了这种结构在换流过程中的规律，该结构有效地解决了开关开断直流大电流的难点。通过模拟实验证明了该失超保护系统满足设计要求。

关键词: 失超保护, 直流快速开关, 爆炸开关, 两级换流结构