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Why is it that polarization index type test is required for
MV and HV motors and not for LV motors?
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Answer Posted / cr
As we r letting high current pass through the winding using ht megger,there by improving I.R because the heat produced and the ir ratio for 10 to 1 minute should be around 2.otherwise the insulation can be said to be contaminated with foreign meterial , this check is priority for ht motors
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Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV
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