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.

What are the criteria shall be considers for sizing Fuse and MCB? If the rated current is 10Amps what should be the fuse size / MCB Size?

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Why does the DC voltage needed is less than AC needed to produce corona?

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During the troubleshooting of an inoperative shunt generator, you found the voltage to be 2+ volts; what is known from this. Is it (1). odds are the armature is good (2). odds are there is no field current flowing in field windings (3). odds are the armature is bad (4). both 1 & 2 are correct (5). both 2 & 3 are correct

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what is the difference between H.T Or HV lines...?

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Make a list of materials and layout diagram for a 35hp motor, to be wired at 35meter away from the MDB in a chemical factory.

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why and where we use early make & late break contacts in protection?

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when neutral will carry the current?what could be the magnitude?

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whats happen if we disconnect the NGR of alternator in running condition?. Generally we observed that transformer netrul is directly grounded but alternator connected with NGR, then ground?

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what is the differences between single phase ind. motor and three phase ind.motor?

3 Answers  

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