Interested to Buy Any Domain ? << Click Here >> for more details...
We have 800KW motor operating at 6600Volt,50 Hz
supply.During 1st startup it tripped on overcurrent
trip.It's FLA is 88 Amps.The K factor of Thermal overloaaad
was set on .94 initially.then we set at 0.97 and then it
started fine.i dont understand why it tripped first?What
are the protections which comes in picture during starting ?
- 6 Answers
- 9700 Views
- I also Faced
- E-Mail Answers
Answer Posted / parveen garg
I DO NOT KNOW ABOUT 6.6KV MOTORS & ALSO ABOUT K FACTOR.BUT
ACCORDING TO UR QUESTION IT LOOKS THAT MOTOR DRAW MORE
INSTANTANOUS CURRENT THAN ASSUMED BY THE CALCULATION & AT
THIS STARTING CURRENT OLR TRIPPED,WHEN U INCREASE THE
SETTING OF OLR.IT DO NOT TRIP.
FOR THE PROTECTION POINT OF VIEW ONE EXTRA CONTACTOR MAY BE
PROVIDE IN PARALLEL TO THE OPERATING CONACTOR WITH TIMER
WHICH WILL MADE OFF THE CONATCTOR(PROVIDED NEWLY)&ALSO THIS
CONTANCTOR WILL DRAW POWER FROM MAIN BUSBAR WITH EXTRA OLR .
| Is This Answer Correct ? | 0 Yes | 5 No |
Post New Answer View All Answers
please send me RRB electrical engineer previous year questions for Sr. Section Engineer
how to calculation increase capacitor,increase power factor for three phase.
Why does the speed regulating system adopting I controller have no steady-state error? In this single closed-loop speed regulating system, when the input of the I controller Un=0, what is the output voltage of the regulator? What factors do the output voltage depend on?
what is the difference between capacitive and resistive voltage divider?
diff b/w elcb and rccb
What is the safety of UPS?
What is the difference between multimeter
what is servo motor and how to work it.
what is PWM in IGBT and how it works for drive.?
Define open loop control system.
When we use 3 terminal resistor?
how can we save enegry by using VFD for Resiprocating Air compressor which is having more unloading running hours
how electical engineer is related to apsrtc (general) post? if they ask a question in interview as why did u choose this job what shd be answer
please send me previous year questions of jspl through which i could prepare myself for the test.
State kirchoff current law?
