Why dc supply is used for closing and tripping coil of ht
breakers. What happen if we use only ups ac supply only.
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Answer Posted / rd dadhich
1.It is very common practice to use battery with charger for
protection , operation & indication in HT switch gears due
to most relable system to work as after charging only
battery comes directly in line during failure of AC supply.
or power supply.
UPS can be used theoretically , but we are adding one more
week link in critical protection supply due to addition of
inverter. , as inverter is :-
AC supply . > Battery Charger > Battery > Inverter
Where as battery charger is only :-
AC supply . > Battery Charger > Battery
2. AC coils of tripping & closing are un common & bigger in
size.
| Is This Answer Correct ? | 11 Yes | 1 No |
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