Fuses and their attributes - learn to become knowledgeable

Fuses

1. (Branch: Civil Engineering)
1)Haresh I Bharadiya (130680106002)
2)Lalabhai N Vagh (130680106048)
3)Nikunj P Patel (130680106027)

3. • It is the simplest form of protection
Against excess current, Short circuit and earth
fault.
• A fuse is a Wire or strip of metal of short
length having low melting point.
•The fuse wire is held in porcelain fuse carrier
and inserted in series with an electric circuit
as a protective device in abnormal Condition.

4. There Are many types of Fuses like,
1)Kit-kat type of fuse
2)Cartridge type of fuse
3)H.R.C type of fuse

6. This is commonaly used in House wiring.It is made of
porcelain in two parts i.e base and a fuse carrier.The
base is with switch board.
The phase or incoming wire is inserted from one side
and connected to the terminal.
Onward connection is taken from the other terminal
known as out going terminal.

7. Advantages:-
Easy removable and replacement of fuse
at negligible cost.
Disadvantages:-
Every possibility of rewiring by a wrong size or improper
material wire.
They have low breaking capacity, can not be used for too
high currents.
The fuse wire can deteriorate over a period of time due to
oxidation through continuous heating of the fuse element.

9. This is a totally enclosed type fuse unit. It is
enclosed in an insulating container of tube shape.
The container the fuse wire is filled up with
powder and sealed at its ends with metallic.
 The power provides good insulating path for the
fuse and helps to absorb the arc at the time of
blowing up of fuse. It is not very economical.
It is generally used at 415 V supply system.

11. With a heavy load capacities of the distribution
network extremely heavy currents would flow into
the fault and the fuse clearing the fault would be
required to withstand heavy stress in the process.

12.  H.R.C cartridge fuses are therefore used for such
duties and these are specially designed for extremely
rapid operation.
HRC fuses are also designed to absorb rapid heat
produced by are formed at the time of blowing out.
The rating is much more accurate and are particularly
suited for breaking much heavier currents safely.

13. Advantage and disadvantage of various
type of fuse:-
Advantages:-
Most reliable to withstand heavy as well as low
stress in clearing the fault.
Low temperature rise at full load .
Silent operation and non-deteriorating
feature.
Maintenance is not required.
Operation is quick, sure and reliable .

14. Disadvantages:-
Advantage and disadvantage of various
type of fuse:-
Most uneconomical.
Little difficult to ascertain which of the
fuse has blown.