Preventative maintenance instructions
If any issues are found regarding the below, contact PS-WarrantyServices@
Eaton.com for assistance on transformers under warranty. Additionally, these
reports must be available upon request to maintain warranty period.
Transformer Exterior Maintenance
Items to Inspect
Points to be Checked
Remedial Action
Frequency
Exterior Surfaces
Inspect for evidence of tampering, battered metal,
gouges, etc. Check for any damage that would
allow the entrance of wires or other metallic
devices.
Any such damage should be repaired
immediately.
Annual
Paint or Protective Coatings
Inspect for scratches or weathering.
Any such damage should be touched up
immediately.
Annual
Tank Leaks
Check tank exterior for signs of a leak.
Any such leaks should be repaired immediately. Annual
General Location
Check the area around the transformer for stored
tools, materials, equipment or debris.
Anything on or against the transformer should
be removed.
Annual
General Location
Walk completely around unit and listen for
abnormal noises; should be a steady hum without
intermittent rattling
Any such abnormal noises should be reported
and investigated.
Annual
Pad
Verify that pad has not tilted resulting in a
transformer that is more than 5° from horizontal.
If pad support is compromised or out of level
greater than 5°, repair it immediately.
Annual
Nameplates
Abnormal or unexpected fading of nameplates or
decals.
Contact your Eaton representative for
replacement nameplates and decals as
necessary.
Annual
Unusual Odors
Smells of fluid or burning. This could be indicative
of an unseen leak under the base. Also, inspect the
concrete around the perimeter of the transformer
base for oil spotting.
Any such abnormal odors should be reported
and investigated.
Annual
Cabinet Interior Maintenance
Items to Inspect
Points to be checked
Remedial Action
Frequency
Gauges and Controls
Check for proper operation.
Repair or replace damaged or defective
equipment.
Annual
Equipment Leaks
Inspect drain cocks, plugs, fuse mountings, and
switches. Look for evidence of insulating liquid
seepage around tank-wall gaskets, seals, etc.
Repair as required. Replacement of gaskets or
seals in the tank wall may require that the tank
be opened and the insulating liquid lowered
to the appropriate level. For instruction on
opening the tank and for draining and replacing
the insulating liquid, refer to the
Insulating
Liquid Maintenance
section.
Annual
Tank Pressure
Check that pressure/vacuum gauge does not
remain at zero for an extended period of time. It
is preferable that a given unit not cycle between
negative and positive pressures on a daily basis.
Commissioning pressures have been documented
in a separate paper based on the top fluid
temperature. Any observed readings lower than -2
psig or greater than +7 psig indicate a condition
that can and should be corrected.
If the pressure/vacuum gauge remains at zero
for an extended period of time this may be
evidence of air leakage in and out of the tank.
A leak test should be performed by adding
nitrogen to the airspace and observing for loss
of pressure over an interval of a minimum of
12 hours. If the pressure is lost, locate the leak
and repair immediately.
Annual
WARNING
Hazardous voltage . Can cause severe injury, death, or
damage to equipment . De-energize transformer from
a remote upstream source before opening cabinet
and doing cabinet interior inspection or maintenance .
Check that all transformer terminals and bushings have
zero voltage . Ground transformer following industry
accepted safe grounding practices .
16
SubStation tranSformer inStallation and partS replacement information
MN202002EN JUNE 2016
