Why VCB and SF6 breakers to be used in HT used by cant ACB
of higher rating to be used for 11kv and 33kv.
Answer Posted / deepak kumar
because in acb time required to extinguish the arc is much
more as compare to sf6 & vcb,if we use acb at higher
voltage , very large amount of heat will produced during
abnormal condition( short ckt) that will damage the acb or
complete circuit
Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?
What is force on a conductor in a magnetic field ?
how to differentiate a mpcb,mcb with a contactor? Explain their working operation
how to calculate the no load current in transformer?
what's prime importance of protection in electrical system.if protection system don't work properly what can happen in electrical system?
In TNC switch, is there any 1NO+1NC block ? and if we move over closing position, is ther any affect on trip position or vice versa?
What is the principal of motor?
can we make a electric generator,which can not use any type of fuel,air,solar,gas,thermal,coal,petrol,etc and able to produce electrical energy (or self electricity generating generator)
In electrical locomotive engines, the DC series motors is being used as traction motor. But in new engines like in WAP7 & WAG9 the 3-phase squiral cage induction motors has replaced them. So can someone tell me the advantages of induction motor over dc seris motor in engines points of view....???
Which type of motor is used in trains, what is the rating of supply used explain working principal?
3phase cable calculation formula by motor load
what do w do when the output of generator is fluctuating?
1)we have 1000 cfm Blower,Dia-1Mtr,Velocity of air 94 m/s 2)We have Natural Air velocity 94m/s 3If i Put Wind Mill in natural air ,speed is 94m/s Then it will generate Assume 100kw 4)If i put same wind mill across the Blower,air speed is same 94m/s now the Question is Will it generate 100 kw?
what will happen if the prime mover on the field excitation of the on-coming generator fails?Explain.
Why is the starting current high in dc motor?