Transformer Principle
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| Transformer Principle |
VACUUM OVEN PROCESS:
Transformer Principle
After and connections are made,
the entire job has to be heated to higher temperature of 100 degree centigrade
to reduce the water contain in the insulation level.
Vacuum oven consist of a heating chamber
vapor condenser ,vacuum pump, exhaust
condenser ,water storage tank ,refrigeration tank , water circulation pump,
vacuum sensor.
DRYING:
After completion of connection the core
and winding are kept on trolley and kept in oven.
Minimum clearances of 200 mm shall be
maintained between the transformer and the heater to avoid damage of the
winding.
The over door shall be soaked between 70
to 90 degrees centigrade temperature shall be maintained constantly until the
min IK values are obtained as given below.
HV-LV 500M OHMS AT 70
HV–EARTH 500M OHMS AT 70
LV-EARTH 500M OHMS AT 70
MAIN PROCESS:
1.Load the job make sure the sensor
position ,close the door and tighten the door properly .
2.Set the control thermostat at 100
degree centigrade .
3.Check the sufficient water level in
the tank check oil level in the vacuum and roots pump.
WORK INSTRUCTION FOR VACUUM OVEN;
A. Heating phase
B.-valve open : Scavenging valve
C.-valve close : Drain valve ,oil line
valve, airing valve , gauge valve , vacuum valve ,throttling valve , drying
valve .
D. Switch on the circulation fan of
chamber switch on heater and cover heater.
E. When job temperature reaches to 100
degree centigrade , steel counting heating time for minimum 4 hours and maximum
depends on job .
F. In mean time switch on water chiller
temperature of water reduce from 25-10
degrees in 3-4 hours .
G. Switch on water circulating pump at
the same time heating continuous same time heating is begin continued for
minimum 4 hours.
a. As soon as heating time of 4 hours is
over.
b. Valve open : Vacuum valve
c. Condensate valve
Valve close : drain valve , oil line
valve, airing valve, throttling valve , scavenging valve .
Switch of the air circulating van
Switch on water circulating pump
ordinary water
Switch on vacuum pipe
Observe the reading
Vacuum indicator shows reading of vacuum
from 250 mbar to 0.1 mbar
When vacuum level reach to 40 mbar
throttling valve gets off due to setting of 40 mbar is done in vacuum control
At evening 1 hour drain out the
condensate water from tank
Close condensate valve ,open valve,
airing valve and drain the water through drain valve.
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