| Inspection
frequently |
Items to be
Inspected |
Inspection
Notes |
Action required, If inspection shows
unsatisfactory conditions |
| Hourly |
Ambient Temp. |
Check that temp. rise is
reasonable |
Shut down the transformer & investigate if
either is persistently higher than normal. |
| " |
Winding Temp. |
|
|
| " |
Oil Temp. |
|
|
| " |
Load (Amperes) |
Check against rate figure |
Note: An improper tap position can cause excessive core loss. |
| " |
Voltage |
|
|
| Daily |
Oil level Transformer |
Check against oil gauge |
If low, examine the transformer for leaks. |
| " |
Relief vent diaphragm |
|
|
| " |
Dehydrating breather
(silica gel) |
Check colur of the
active agent |
If silica gel is pink change by spare charge. |
| Quarterly |
Bushing |
Examine for cracks and
dirt deposits |
Clean or replace |
| " |
Oil in Transformer |
Check the Electric
strength and water
content |
Take suitable action to restore quality oil |
| " |
Dehydrating Breather |
Check oil level in oil cap
and that air passages
are free |
Make up oil, required. |
| Half Yearly |
|
|
|
| Yearly or earlier
if trans-former
can conveniently
be taken out
for checking |
Oil in transformer |
Check for acidity & sludge |
Filter/Dehydration or replace. |
| " |
Insulation Resistance |
Compare with value at
time of commissioning |
Process if required |
| " |
Relays,
alarms, their
circuit, etc. |
Examine relay &
alarm contacts &
their operation, fuses
etc. check relay, accuracy, etc. |
Clean the components or replace contacts
and fuses if necessary. Change the
setting if necessary. |
| " |
Earth
resistance |
|
Take suitable action. if resistance is high |
| 3 to 5 Yearly |
Complete
transformer |
Overall inspection
including lifting of core
and coils |
Wash by hosing down with clean dry oil.
Tighten where necessary. |