@doc70 said:
I have a 13800V to 600V 2MVA step-down transformer.I need to megger test this unit, I have a megger good for 5KV and also a hi-pot DC tester (Megger brand).
I am unclear of how to make the physical connections between the transformer and the testers.
make sure the transformer is not connected to any thing like the potential transformer,than carry out
[1] usual insulation test between the frame and the connections terminations of the ht side.
[2] test between frame and the lv side terminations.
[3] test between ht terminations and LV terminations.
[4] test between phases at HT side
[5] test between phases at LV side.
[6]