Why dc supply is used for closing and tripping coil of ht
breakers. What happen if we use only ups ac supply only.

Answer Posted / sakthivel

Er sushil saini i understand in your answer but in power
house batter is not available other wise power pack power
supply available , power pack is nothing but it is a in our
three phase power supply converted in to dc 110 volts , in
this circumstance what can i do vanthni@yahoo.com please
answer Er sushil saini

Is This Answer Correct ?    0 Yes 5 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

how to select the double earth conductor if 21A full load?

1566


what is 30-phase of transformer

1753


why ups rating in kva? and why ups are in parellel?.why isolation transformer is used in ups?

1476


What is principle of Floroscent tube 36watt.

1582


What are the factor to be consider for CT selection in 132kV substation?

1622






What is ignition module of a CAT Gas Genset G-3508 Engine, Alternator SR4B Series. HOw its checked for correct functioning.Is it repiarable or replacable?

1738


In case of salient pole alternator when number of poles are 4 or more than 4 it helps the flux wave to be sinusoid as air gap length is increased from center to tip , but if the number of poles are 2 how does the flux wave is sinusoidal?

1531


how is calculated the quantity of weight in hot test xlpe?

2013


5.WHICH TYPE WELDING PROCESSES USES NON CONSUMABLE ELECTRODE.........

1708


What is mason's gain formula?

787


Define availability (operational)?

663


WHAT IS AIR GAP VALUE IN MM FOR A 11KV BUSHING OF 11KV/440V DISTRIBUTION TRANSFORMER. AND AIR GAP VALUE OF 25 KV BUSHING OF AT TRANSFORMER OF 25 KV TRACTION. WHAT IS THE CALCULATION FOR THE AIR GAP PERMITTED FOR BUSHINGS AT DIFFERENT VOLTAGES.

3052


What are the no-load losses for the 11000/415V transformer with the following rated capacity? 1.1500 kVA 2. 2000 kVA 3. 2500 kVA 4. 3000 kVA

1168


how we will deside the high voltage value

1464


solar energy light efficiency & disadvantages?

1571