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  1. MattRTB

    Overvoltage on transformer primary

    A 500kva threephase padmounted distribution transformer ( loopfeed with 3,8.5kv elbow arresters) primary voltage 13.8kv DELTA and 277/480volt WYE SECONDARY was energized with no load and while single phase switching and upon closing the last cutout one of the MOV elbow arresters failed with a...

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