A 6kW, 380V three phase induction motor of 0.96 power factor...

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Question by Dhammika
Submitted on 8/29/2003
Related FAQ: rec.woodworking Electric Motors Frequently asked Questions
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A 6kW, 380V three phase induction motor of 0.96 power factor is udes to run a certain machine. It is observed that the motor takes 6 times the rated current at the instant of switching on and gradually drops to 96% of the rated current after 12 seconds when the machine is running at its normal steadly working speed. This motor is protected by means of a thermally operated over current relay and the circuit conductors feeding the motor are perotected by means of fuses conforming to BS 1361. FUSE RATING 0.1sec 0.2sec 0.4sec 5sec 5A 30A 25A 22A 14A 15A 97A 80A 70A 40A 20A 180A 155A 135A 82A 30A 280A 240A 200A 125A 45A 550A 470A 400A 240A 60A 880A 720A 600A 330A 80A 1100A 950A 800A 460A 100A 1800A 1400A 1200A 630A a) calculate the rated current of the motor b) calculate the actual current drawen by the motor when running at steady speed c) what is the rating of the fuse (BS 1361) that you select for this circuit. justify your answer

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Answer by thevang
Submitted on 2/16/2004
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1)The rated current of the motor is 16.45A. 2)The machine draws a current of15.8A when running at steady speed. 3)You have mentioned only about the overload so you can use 30A fuse as it can withstand 125A for 5sec as per BS 1361 standard.

Answer by ramkumar
Submitted on 7/14/2006
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i want to know aboutthree phase induction motor

Answer by odi the pogi
Submitted on 11/30/2006
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Current at full load will be 9.5A. Then run at steady speed with a current of 9.12A. Use a 15A fuse rating which can hold 70A current for 0.2sec.

Answer by bcs
Submitted on 4/3/2007
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what does 3 phase mean

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