At site, we have 30Kw motor (3 phase, 400V,50Hz) and FLC
54A as per the nameplate. At the time of starting it draws
840A instead of 390A (7.2%). As per the data sheet also its
390A starting current. it thru a dol starter from the MCC.
can anyone tell what is the problem in the motor
- 5 Answers
- 9726 Views
- ME, I also Faced
- E-Mail Answers
Answer Posted / wani y.s.
First Check the healthyness of the motor -
1. Check the winding resistence
2. Check insulation resistance using megger.
3. Check the bearing and apply the lubricant as applicable.
4. Check the healthyness of connected load.( It should not
locked etc.)
5. If all above is OK. Then remove the motor from load &
ensure it is starting in ideal condition.( Hope connections
you are following up as given on the nameplate)
If it is starting in no load that means load GD squre is
high. Motor is taking longer time to start.You have to
select proper heavy duty DOL starter to withstand the
longer starting time. But ensure that motor is having
thermal time capacity to withstand this time.
7. You can also go for VFD as a starter this will definetly
will solve your problem no need to take care of thermal
time of the motor. Only select proper VFD to suit starting
torque of your application.
| Is This Answer Correct ? | 0 Yes | 1 No |
Post New Answer View All Answers
is it possible to test of bus bar in high rise building without completed full floor ?
Whar is the KvA rating of 33Kv substation & actual kv rating of power generaating station.
how to calculate regulation constants for over head lines? and what are the regulation constant for raccoon conductor at different voltage level and different P.F?
how to CHECK CT AND PT AT THE FAULT OCCUR IN GENERATOR RELAY PANEL .
How impulse levels are calculated that for 11kV impulse is 75kvp, for 24kV impulse is 125kvp ?
Why single phase induction motors are not self starting ?
How does the slip regulator works as a startor
what is EIB lighting control system? what is the advantages of this system?
The knee point of a current transformer is normally unique and known.So why in the nameplate of a CT they put the minimum value like this Vk> 400v.
I am going to appear for the RRB Chennai junior Engineer online exam. Please send me the previous exams question papers (also solved) to my mail id: rrkhandhar@yahoo.com
Where should the lighting arrestor be placed in distribution lines?
Apparent power is expressed as V * I(Conjugate). Why not in V * I ?
In general bus riser follows the bus section in SWGR. What are impacts if bus section follows bus riser?
How to calculate the time setting for star connection in star delta starter? For example 10KW 3PH Induction motor.
what is the path of thunderlightening? once both a buffalo and a person were standing 5m apart but lightening hit and killed buffalo not person?
