What is the Polarisation index value ? (pi value)and
simple definition of polarisation index ?
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Answer Posted / josephat murusura
PI is the ratio of the 10minutes megger value to that of
the 1 minute.The minimum acceptable value is 2.Any value
below 2 is not good enough for the operation of the
electrical machine[motor or transformer]& it indicates that
the winding insulation has detoriated.
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