An Insight into Insulation Resistance Testing

[@sohailjanjua123]

Hi, I like your lecture. Thanks

[@aisamagantal2711]

Hi there. Why shorting the windings for testing the transformer? I notice some testing they dont short the windings. For 3 phase transformer wye-delta, is it recommended to short windings (H1,H2,H3 to L1,L2,L3)?