Why dc supply is used for closing and tripping coil of ht
breakers. What happen if we use only ups ac supply only.
- 12 Answers
- 36905 Views
- ACC, JLL, ZETDC, I also Faced
- E-Mail Answers
Answer Posted / er. manoj
Now consider a situation when there is a fault and coil supply is given AC, as we know in case of fault there is a voltage dip, so across the coil sufficient voltage would not build up to energize it. So DC is given across tripping or closing coil
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
Show the schematic arrangement of diesel power station layout and give its principle of operation.
I am a electrical engg. diploma holder,applied for junior engineer (electrical),Kolkata RRB. Have I to attend all electrical,mechanical&civil portion in written exam.???
why the perameters of secondary circuit are more important then that of the primary circuit of induction motor?
what r the checklist while installing 500 kva transformer
1) What are your personal strength? 2) What are your personal areas of improvement? 3) What are your expectations from from a particular job? 4) what are your carrier objectives?
What is the difference between relays and contactor construction wise?
to vary valtage from 0 - max a variac is necessary . so how to design for high power applications nearly about 200KW power
checking procedure of capacitor based motors.used in fans etc?
The power factor of the fixed load is 0.8, now the p.f is varying from 0.8 to 0.5.
TELL ME WHAT IS INDUCTOR AND CAPACITOR WHAT IS IT BASIC OPERATION ANDFUNCTION?
What is the general system requirement of alternator?
What is the formuala to calculate the rating of motor protection circuit breaker
what is the operating time for LBB and how does the LBB relay realise whether cb is opened or not?
How many gap between finger contact in a.c.b. and v.cb.?
How to protect sensitive loads such as Dosing pumps inside a factory from voltage surge/voltage fluctuation.
