The over hauling of
welding plant transformer is also done her. It is a 440/80 Volt transformer. It
has a junction circuit breaker. It has three controllers: one for on/off
function, one for slow working and one for fast working.
ELECTRONIC BLAST:
The electronic blast is
used in tube lights for its proper working. The electronic blast consists of
following parts of specified ratings:
|
Name of Equipment
|
Remark
|
Ratings
|
|
Choke
|
1
|
11W, 110V
18W, 110V
20W, 110V
|
|
Electrolytic
Condenser
|
5
|
10 µFarad, 450V
11 µFarad, 60V
100 µFarad, 50V
10 µFarad, 50V
|
|
Capacitor
|
5
|
0.22 µFarad, 400V
|
|
Resistor
|
10
|
2.2Ω, ¼ W
47Ω, ¼ W
470, ¼ W
|
|
Biasing
Coil
|
1
|
_________________________
|
|
Transistor
|
1
|
1 MJE,1300S, NPN,
100N, 1NPN
|
|
HRC
|
3
|
6565
|
|
Diode
|
4
|
IN4007
|
|
Diode
|
4
|
IN4148
|
|
Resistance
|
2
|
16kΩ
|
PRE
COOLING TRANSFORMER:
The pre cooling transformer is used in
AC coaches. When the train stops at any station for more than 10 mins and is
loaded with passengers, then the pre cooling transformer is attached to the
main supply of the coach. This is done to maintain the comfort temperature of
the coach because the batteries are not designed to bear so much load for such
a long time. The pre cooling transformer is a 200 Amp, 440/220volts
transformer. A rectifier is attached to this transformer which changes AC to
DC. The 3-Ω supply is given to HRC fuse. ML4 contactor is connected to these
fuses. The rating of this contactor is 70Amp, 415Volts. The supply is given to
the rotary switch which is a 4 pole, 4 way, 63 Amp switch. The primary coil of
transformer consists of two type of winding – fine and coarse.
