Siemens GEAFOL Neo, Руководство по эксплуатации, Страница: 25 / 32

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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.
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%).
9.2 Maintenance matters
S/N Maintenance items Maintenance cycle (recommended) Use Tools Methods:
1
Clean the surface stains of windings,
pads and cores and stains at the heat
dissipation holes of the enclosure
Normally, each year or more. Every 6
months for dusty and other polluted
environment
Dry compressed air, pressure ≤ 3
bar, dry rags and alcohol
Select cleaning method according to Form 1
2 Check winding surface condition
Normally, each year or more. Every 6
months for dusty and other polluted
environment
Visual inspection
No blackening or cracks on the surface
of the winding (if any, please contact the
manufacturer)
3
Check bolt and nut tightening status
at cable connections
Each year or after maintenance Torque wrench According to the torque table
4
Check correct tapping connections
and bolt tightening
Each year or after maintenance Torque wrench According to item 8.1 and torque table
5
Check grounding condition of
transformer body and enclosure
Each year or after maintenance
Torque wrench and visual
inspection
According to the torque table
6
Check whether temperature controller
settings, temperature probe and
PT100 are normal.
Each year or after maintenance Heat gun, power supply
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
7
Check accessories such as
electromagnetic lock, travel switch,
etc.
Each year or after maintenance Multimeter, power supply
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.
8 Check the cooling fan Each year or after maintenance Power supply
Turn on the power supply, start the operation
according to the manual of the temperature
controller, and observe whether it rotates
9 Insulation resistance test
Each year or after maintenance or 5
years
Insulation resistance tester Refer to Item 7.3.3 for test values
10 Transformation ratio test Every 5 years or after maintenance Transformation ratio tester Refer to Item 7.3 for test
11 DC resistance test Every 5 years or after maintenance DC resistance tester Refer to Item 7.3 for test
12
Power frequency withstand voltage
test
Every 5 years or after maintenance
Power frequency withstand
voltage tester
Refer to Item 7.3 for test
9. Maintenance
Sediment Cleaning method
Oily 2
Carbonaceous 1+2
Metal-containing 1+2
Saline 1+2
Dry dust 1+2
Wet dust 2