c.2. Insulation resistance of each winding to all other
windings and ground and from all windings to ground
should be made with the windings under liquid. Re
cord the temperature of the liquid. These readings
should be comparable with measurements made at the
factory.
c.3. Disconnect the core ground connection on core
form transformers and measure the resistance from the
core to the tank or end frames, using a lOOO volt meg
gar, the resistance should exceed lOO megohms if the
core is not covered with oil, or
200
megohms if the
core is under oil.
When the internal inspection is complete, reseal the
tank and refill the gas space with dry air or dry nitro·
gen. Subsequent steps will be given by the Westing
house representative to whom the suspected damage
was reported.
3. HANDLING
3.1 Tilting
Transformers should be handled in the normal upright
position, but in no case tilted more than
15°
from verti·
cal, unless instructions have been given to the contrary.
Refer to the outline for these instructions.
CAUTION
Transformers may fall over if tilted more than 15°, or
undue stress may be exerted on the bushings, causing
leaks. The core and coil may be dislodged from its cen·
tering pins causing damage to the internal assembly, bush
ings and core and coil tie plates.
3.2 Lifting
Lifting hooks or eyes are provided on the transformer
tank wall. Only these hooks can be used in lifting the
complete transformer. Refer to the outline for the proper
lifting hook locations. All four lifting hooks must be used
for proper handling.
CAUTION
Lifting the transformer in places other than the tank wall
lifting hooks may result in damage to the transformer
causing oil leaks. It may also result in the dropping of
the transformer.
Use
the guides for lifting contained in
the table.
3
Chain No. of Chain
Chain Sling
Capacity (lbs.)*
Size
Chains Capacity Without
With
(in.)
Req'd. (lbs.)
Spreader Bar Spreader Bar
1/4
4
3,250
8,400
11,200
3/8
4
6,600
17,100
22,800
1/2
4
11,250
30,000
40,000
5/8
4
16,500
43, 500
58,000
3/4
4
23,000
60,000
80,000
7/8
4
28,750
75,000
100,000
*Lifting capacity is the smaller of:
1.
Spreader bar capacity.
2.
Chain
sling capacity.
60°
Angle is smallest angle permitted with or
without spreader bar and is the angle between
the chain and the cover.
3.3 Jacking
Jacking areas are provided for lifting the transformer
with jacks.
All
such areas must be used when the trans
former is to be jacked.
Check the outline drawing for any required special
equipment or procedures to be used in jacking.
CAUTION
Do not jack on any area of the transformer other than the
jacking areas provided for this purpose. To do otherwise
may result in damage to the transformer resulting in an
oil leak.
3.4 When the transformer is supplied with removable
tem1inal chambers, these may be detached to facilitate
moving the transformer.