In Megger which types of test we can do ? and How it works? How to use?
Answer Posted / nandagopan
for 3 phase motors megger is used to test the insulation
resistance of motor winding.phase to earth(winding to body)
must be greater than 1 mega ohm.
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generally in LT and MV motors we are using 3.5Coresx16,25,35,50 etc cable for supply.although motors is earthed at two point and having all protection.then why we are using that 1/2 core for earthing the motors.while in HT cable we are using only 3core cable for motor supply.generally lt and mv motors are delta connected and ht motors having star connection.whethere it is having any relation with winding connection( star or delta).all motors i am talking about are dol only.can anybody solve my confusion.thanks...
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