Is LV shorted in magnettic balance test?If yes why?
Answer Posted / tanmay kumar
generally magnetic balance test was done in transformers to know the ratio that means to check its rating whether it is giving the output or not as per the rating,,,in case of magnetic balance test the voltage feeded at the primary side always i.e l.v side and the secondary side is at no load i.e open ckted and a tongue tester is used to measure the amount of flowing current from primary to secondary.
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We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
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