hipot dc test

I was conducting a Hipot test on a 3 phase circuit consisting of 3 single core cables, 15kv ,120sqmm (250mcm) XLPE/PVC, with concentric neutral, 600m long , I was going to apply 64KV dc for 15 min ,I started with the red phase the other two cables Yphase and B phase are beside the red phase no

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