a 3 phase motor was running with delta connected, suddenly
one phase winding got burnt off, what will be the effect ?
Answers were Sorted based on User's Feedback
delta connected winding, one winding burnt off means, its
open circuited. So the motor will work as open delta system
and run normaly with non uniform torque.
The max. load that can carry will be reduced to 57.7% of
full load.
If the motor is connected through a phase faliure relay,
the relay will trip the total ckt.
Is This Answer Correct ? | 111 Yes | 3 No |
Answer / najib
There are different situations in which this question can
be looked into.
Case 1.The motor is lighly loaded
In such a case the motor shall continue to run at the same
speed without any hiccup.
Case 2.The motor is supplying a rated load
In this case the motor shall draw current more than the
rated valeu and run at a slightly less speed
Case 3.The motor is heavily loaded
In this case the motor shall stop running and chances of
burning of winding is very large
Case 4.The motor is stationary
In this situation the motor shall not start at all.
Is This Answer Correct ? | 12 Yes | 1 No |
Answer / kapil bahadure
a 3 phase motor was running with delta connected, suddenly
one phase winding got burnt off,this colled as asingle
phasing.in this condition motor takes large current from
suplly.& large current flow in stater winding. so large
heat produced by stater winding.then burn out motor.
Is This Answer Correct ? | 11 Yes | 2 No |
Answer / b.v. reamon
the effect ---single phasing... motor oveload protection
or MCB will trip and open the circuit.
Is This Answer Correct ? | 14 Yes | 12 No |
Answer / p.babukumaravel
motor overload protection or MCB will trip and open the circuit
Is This Answer Correct ? | 2 Yes | 1 No |
Answer / anilkumar
3 phase motor running delta connection,if one phase got
burnt means it will work as open delta,it will carry the
load 57.7 percentage of full load and this is called scott
connecton.
Is This Answer Correct ? | 2 Yes | 5 No |
why permanent magnet generator have higher frequency of 400hz
what principle the cabel TV channels are transmitted? will you be able to check the power at the connector behind your TV with a tester?If yes what is the supply level?
why m and c are shorted in wattmeter
From reading, Under voltage relay used also as phase sequence relay now, Why I use under voltage and phase sequence relay in the same circuit (ATS)?
why d.c. supply is given to the primary side of generator?
Why the resistance grounding (NGR) is better than Solid grounding?
why fault current always calculated for 1 seconds?
To prevent the mal operation of a differentially connected relay while energizing a transformer, the relay restraining coil is baised with (a)second harmonic current (b)fifth harmonic current (c)third harmonic current (d)seventh harmonic current
.php|
If the rotor pf of a 3 phase induction motor is .866, then what is the phase displacement between stator and rotor magnetic field 1)30,2)120,3)150,4)90 please justify....
can induction motor run over the rated speed ?