what is the function of a starter in a motor?
explain RLC circuit.
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Answer Posted / pratap khamari
a starter is a device generally used to reduce the high
initial current to the safe limit.when we start motors high
initial current to be flow through motors which effect to
others load connected that supply because the initial
current is 6-8 percent of full load current.to reduce the
initial current starters are used except DOL starter.There
are verious type of starter
1.DOL STARTER
2.STAR DELTA STARTER
3.RHEOSTAT STARTER
4.AUTO TRANSFORMER STARTER
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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?
