Maintenance - Siemens GEAFOL Neo Operating Manual

9. Maintenance

Cast-resin transformers are maintenance-free. Routinely inspect and clean the windings, bolt connections, alarm
devices and all fan functions once a year. If the transformer is in dusty environment or close to the pollution source, it is
recommended to clean the equipment every six months. It is recommended to fully inspect and clean the transformer
every 5 years. Before maintenance, the transformer must be powered off and all terminals must be short-circuited and
grounded.
9.1 Transformer cleaning
Blow off the transformer with dry compressed air or wipe with dry cloth and alcohol (concentrations above 85%) to prevent
the formation of creepage paths and blockage of cooling air passages. Select the appropriate cleaning method from Table 1
according to the type of contamination.
Sediment Cleaning method
Oily 2
Carbonaceous 1+2
Metal-containing 1+2
Saline 1+2
Dry dust 1+2
Wet dust 2
9.2 Maintenance matters
S/N Maintenance items
Clean the surface stains of windings,
1 pads and cores and stains at the heat
dissipation holes of the enclosure
2 Check winding surface condition
Check bolt and nut tightening status
3
at cable connections
Check correct tapping connections
4
and bolt tightening
Check grounding condition of
5
transformer body and enclosure
Check whether temperature controller
6 settings, temperature probe and
PT100 are normal.
Check accessories such as
7 electromagnetic lock, travel switch,
etc.
8 Check the cooling fan
9 Insulation resistance test
10 Transformation ratio test
11 DC resistance test
Power frequency withstand voltage
12
test
Maintenance cycle (recommended)
Normally, each year or more. Every 6
months for dusty and other polluted
environment
Normally, each year or more. Every 6
months for dusty and other polluted
environment
Each year or after maintenance
Each year or after maintenance
Each year or after maintenance
Each year or after maintenance
Each year or after maintenance
Each year or after maintenance
Each year or after maintenance or 5
years
Every 5 years or after maintenance
Every 5 years or after maintenance
Every 5 years or after maintenance
Cleaning method 1
Use compressed air to blow the transformer. The compressed
air must be oil-free and water-free, and the air pressure ≤ 6
bar. Vacuum cleaners can also be used instead of compressed
air for dust collection.
Cleaning method 2
Wipe with a dry rag and alcohol (concentrations above 85%).
Use Tools
Dry compressed air, pressure ≤ 3
bar, dry rags and alcohol
Visual inspection
Torque wrench
Torque wrench
Torque wrench and visual
inspection
Heat gun, power supply
Multimeter, power supply
Power supply
Insulation resistance tester
Transformation ratio tester
DC resistance tester
Power frequency withstand
voltage tester
Methods:
Select cleaning method according to Form 1
No blackening or cracks on the surface
of the winding (if any, please contact the
manufacturer)
According to the torque table
According to item 8.1 and torque table
According to the torque table
The temperature of the temperature
controller can be displayed normally by
blowing the temperature probe with a
heat gun. The setting of alarm trip value
is consistent with Item 7.1. 1. Refer to the
operation manual of temperature controller
for setting method
The function is normal when the
electromagnetic lock is energized. When the
door panel of the enclosure is closed and
opened at normal state, the normally open
and closed terminal of travel switch are in
the correct state.
Turn on the power supply, start the operation
according to the manual of the temperature
controller, and observe whether it rotates
Refer to Item 7.3.3 for test values
Refer to Item 7.3 for test
Refer to Item 7.3 for test
Refer to Item 7.3 for test
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