Research About Fault Current Limiter In Coal Mine Going Underground Cable Based On SSCB

This paper has proposed a fast fault current limiter structure of SSCB in coal mine powergrid based on research of coal mine power grid short circuit fault, and analysed theoreticallythe effect of fault current limiter to short circuit fault process in coal mine power grid, andsimulations has been carried out to test the conclusions. By analysis of common fault currentlimit methods at present, this paper has proposed a fast current limiter main structure of SSCB,then analysed its actuation time and simulated actuation process. By research on fault currentlimiter actuation process, this paper has proposed a structural model of switch and inductorin parallel instead of inductive type fault current limiter, and analyzed short circuit transientprocess of coal mine power grid and derived current changes in the formula, deducedengineering calculation method of the required current-limiting inductor value. On thefoundation of fault current changing rule, this paper has proposed fault current detective timerequest, that is3ms; short circuit fault can be judged fast and accurately by using currenthigher derivative.