The use of solid state switches as interruption devices offers significant advantages in circuit brealer applications. Because of the specifications of Solid State Interruption (SSI), its structure, its component requirements and its technical constraints are rather different from those of general power electronics systems. As the major difficulty of SSI is thermal dissipation, the components are first chosen for their low voltage drop and parallel connection can often be an effective means. In this paper, the rules for the design of SSI and its particularities are discussed. Two DC-breakers have been designed using IGBTs and GTOs respectively to show the technological limits and technical constraints of SSI.
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