Abstract
An equivalent circuit for a core snubber is established in this paper. The circuit can approximately express a parallel resistance and inductance. The resistance can be directly calculated according to the resistivity of the magnetic core and structure dimensions of the core snubber referring to Fink-Baker-Owren (FBO) method, and the eddy current factor is adjusted to one. In this paper, the shunt inductance neglected by FBO is first considered, and it can be obtained from critical characteristics of the magnetic core and structure dimensions of the core snubber. The two electrical parameters are varied with saturated zone of the inner turn of tape. Then, the simulated model of a core snubber is set up. Finally, a miniature core snubber is analyzed, and its parallel resistance and inductance are obtained from the experiment condition. The test data validate the analytic model. The method presented in this paper is proved to be useful in the design of core snubber for the Experimental Advanced Superconducting Tokamak and the International Tokamak Experimental Reactor.
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