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CT heating problem in MV switchboard

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  1. kashifidrees
    kashifidrees avatar
    1 posts
    Registered:
    21 Mar 2018
    21 Mar
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    We have an 6.KV switchboard installed at our plant site. One of the MV panel, which generator  incoming panel with breaker rating of 2500amperes has some problem in it. There are 4 single core SWA cable terminating at each phase. the armor of cable is grounded at switchboard end only. the CT for middle phase has always burning marks on its bottom surface. The thermography of switch-gear rear side revealed that plate on which CT are mounted is at 80 degree C. While on top of all CT the temp is about 56 degree C on surface with temp gradient decreasing away from middle mounting plate. 

    We appreciate if anyone can help us out in determining root cause of heating. .
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