Answer / bhanu

change over switch, which is used to change the source of
power, there are four connection points( terminals) in a
change over switch,Example:- you can connect DG power &
board power as input terminals then connect output
terminals to the load ( just like two switches inter
connected by mechanically or electrically, at a time one
switch will ON & other is in OFF position)
Switch disconnector/ switch disconnector fuse unit :- in
old days the main switches( SFU- Switch fuse unit) out put
terminals& fuses are mechanically connected when switch is
in OFF position but in SDF/SD when the switch is OFF
position there is no any connection between input/ out put
terminals & fuses.
Bypass switch - it is just like an ON/OFF switch , if any
auto linked circuit connections are failure you can use a
switch to make the circuit complete.

Can a 50-Hz designed transformer be used at 60-Hz system? Is the same remains true, when a 60-Hz designed transformer be used at 50-Hz system? Consider only frequency variation. The voltage remains as rated value in all cases. Justify the answer.

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