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 ?
Answer Posted / karthik_elec
u did'nt mention which type of starter you used,and which type of operation no load or full load, this type large motors always used soft starter only, auto transformer will not use, any way at the time of starting auto transformer only gradually increase the applied voltage , at that time the motor will take more amps to obtain the specific torque, due to that only, after obtain normal amps it will not take 88 amps also, because this is 100% efficiency current, below that only....
Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
In HI POT test what is reason for applying the AC VOLTS and DC VOLTS in different applications what is the nessesity for this ?
Can you used moeller lzm1 mccb in a dc system with 125vdc and 20ka short circuit current , beside is it have 24 or 48 volt shunt ? Beside how long current can through from An MCB shunt contacts? (like Z7-AS 24 V)?
to vary valtage from 0 - max a variac is necessary . so how to design for high power applications nearly about 200KW power
What is the function of electron gun used in crt?
What is cable tray, its type, and its support?
How many size of cable required for a 300m long and 30kw inductive lode
how does WTI work ?
If 22 KV HT line, Current transformer is 25/5 then how to calculate multiplying factor.
1. The DC generaror,s induced output emf is connected with a DC motor(as load). when increasing the load of the motor by using brake drum or any way. what are the parameters will changes in both motor and generator(voltage, current, resistance, frequency, speed, torque, power, flux etc...) 2. Similarly for AC generator and AC motor 3. similarly if using DC batteries instead of DC generator, What happens?
why we use single core 630mm2 cable for transformer secondary side
Why we use mho Relay in long transmission line?
what are the applications of TIG welding
What should be the height of basement according to NBCC code?
explain supply side and demand side energy management with advantages & disadvantages
how to check avr of dg set of 125kva