3 Phase Circuit, Unbalnced load |
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3 Phase Circuit, Unbalnced load |
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 Jun 5 2008, 04:04 AM
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#1
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Intermediate Member  Group: Full Member Posts: 14 Joined: 9-May 08 From: india Member No.: 4,547  |
what are the causes of Unbalanced load in 3 phase circuits?
How large unbalanced load causes burning of motor? |
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Jul 17 2008, 01:04 PM
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#2
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Intermediate Member Group: Full Member Posts: 12 Joined: 16-September 07 Member No.: 3,794 |
There are basically two sources of unbalanced currents in a 3-phase system driving motor loads
1 From source voltage source voltage is not perfectly balanced.Either magnitudes of the phase voltages are not exactly equal or the phase angle between them is not exactly 120 degrees 2.From load side There is unbalance in connected load 3. Defective motor No .of turns on all phase windings are not exactly same. windings are not distributed equally in space may be due to problem in number of slots that is number of slots not divisible by phase-pole belts. Generally speaking a standard motor can take an unbalance voltage of 1%. Beyond this it has to be de-rated and used up to 5% unbalance. Above 5% unbalance it should not be operated |
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