We use MCCB not MCB for motor starters because MCCBs has capablity to drawout the motor starting current which is 5-6 times the full load current of motor for 1sec.
Then why we use SDF in starter panel means MCC panels.
Pls reply if any one knows this answer.
Answer Posted / omer a.osman
What do you mean by SDF. I guess Star/Delta.
In this case, the starting current will be reduced & within 15 to 20 Sec. the Sytem will changed to Direct on line in running Condition by taking the full load current. Hence, the recommended MCCB rating as protective device to protect the feeders should not be less than the current carrying capacity & tripping current about 1.45In. However, the breaking Capacity of the MCCB is an essential factor.
Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
Draw a circuit diagram in which if button is open we can use socket and bulb as a series test circit and if button is close than simple we can use socket as any load purpose.
Whether should be the oil level in OCTC transfomer? It should be upto winding immersed completely or should be upto tap changer s/w? How it will affect the performance of the transformer. Rating may be 33KVA
What is star-delta transformer?
what is acceptable leakage current for 33kv cable while doing high voltage test for cable? how to calaulate the leakage current for 33kv or any rated cable?
Difference between low impedance and high impedance Restricted Earth Fault
What is meant by bus bar protection?
What is meant by load angle of an alternator? Upon what factors does the load angle depend?
what questions will be asked for 11/33KV licence interview APSEB hyderabad. Can any one share question and answers.
what is consequences of neutral and earth connect?
r we are using in gas turbine mark (5) frame (6) (made in india Bhel 1997) Ā
I have experienced electrical maintenance HT ,but I completed be ECE ....can I apply c license or not ???? Pls help me friend s...
How to calculate MCB Breaking capacity.
WHAT IS MOBILE SUB-STATION? & REALLY BENEFIT IN INDIA
How can we checked Killo Watts of Motor & Alternator?
is there any phase difference occurs while primary and secondary side mutual induction occurs?