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
- 8084 Views
- I also Faced
- E-Mail Answers
Answer Posted / a.kossay
FIRST OF ALL THIS MOTOR MUST HAVE A SOFT STARTER BECAUSE
STARTING THIS MOTOR WILL DRAW A HUGE AMOUNT OF INRUSH
CURRENT + HUGE AMOUNT OF STARTING CURRENT, SO YOU HAVE TO
USE SOFT STARTER , AND YOU HAVE TO USE SMART RELAY BECAUSE
STARTING AND INRUSH CURRENT CONATINS A HUGE AMOUNT OF
HARMONIC CONTENTS SPECIALLY THIRD HARMONIC SO THIS SMART
RELAY WILL DETECT THE VALUE OF THE THIRD HARMONIC COMPONENT
AND IF IT EXCEEDS ITS VALUE IT WILL TRIP
| Is This Answer Correct ? | 2 Yes | 2 No |
Post New Answer View All Answers
What is the maximum percentage voltage drop (vd%)for a motor control center
What is negative sequence over voltage element?
Advantages of using generator circuit breaker (GCB) scheme in a power station ?
Write a note on Treatment for electric shock.
How do we calculate the resistance per metre of single core aluminium stranded cable 19*3.25mm sheathed in pvc,at 15 deg C temperature?
what is the transmission loss for electrical supply? specifically a large shopping complex where the grid is half KM away, what will the % of transmission loss? is there any transmission loss for captive unit generation for above set? thanks
What is PQA???Applications........
Define the term Capacitance and Inductance?
How many sprinklers should be in one pipe line?
what is meant by poly phase induction motor ? how its operating by single phase or three phase?
why moisture formation found in XLPE Armoured cable outer sheath
is IS says that neutral should be brought to switch box. and this one is a recomended practice
which type of motor is used in automatic swing gate
What is force on parallel conductors ?
Define thermal resistance in the context of power amplifier.
