Answer / jayveer

as the plug area larger than the resitance
of that plug decrese so the fault current
chose the past have least resistance...and
flow through it..

Dear sir,We have a 7.5hp motor,it was running smoothly and suddenly one winding is carring more current then others(r=6.5,y=6.3,b=10)..whts wrong with tis...?

5 Answers   Hindustan Motors,

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WHAT IS DIFFERENCEN BETWEEN CURRENT AND VOLTAGE?

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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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In all electric motors, fans are provided to dissipate heat. How it dissipate the heat? By absorbing atmospheric air or by exhausting the heated air generated while running?

2 Answers   Ford,

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does frequency affects the load? if yes elaborate it.

1 Answers  

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