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Insulation resistance and power factor values may vary considerably
with transformer design, size and voltage.
these values versus time for a given transformer are more
significant than a specific value.
measurements be made after cleaning the transformer at each
maintenance
period.
Care
measurements are made in the same
transformer at essentially the same temperature each
The voltage at which these measurements are made should not
exceed the line to ground operating
whichever
is
greater.
voltage line connections must be opened for these tests.
trends in these values will permit a more informed judgment as
to the condition of the insulation system. Refer to the paragraph
under "ENERGIZATION AND OPERATION" for minimum acceptable
values. Coil jack bolts, if provided, should be checked and tightened
if loose.
CLEANING
To inspect the transformer, de-energize, lockout and
ground all circuits supplying power to the transformer and it's
accessories and remove the front and rear panels.
Failure to de-energize the transformer and it's accessories
before removing the front and rear panels may result in serious
personal injury or death.
If dirt is found on the windings, insulators, leads or terminal
boards, it should be removed to permit free circulation of air and to
guard against the possibility of insulation breakdown.
attention should be given to cleaning top and bottom ends of
winding assemblies and to ventilating ducts. The use of a vacuum
cleaner is recommended as the first step in cleaning followed by
the use of compressed air. The compressed air should be clean
and dry and should be applied at pressures below 25 PSI (170
kPa). Lead supports, terminal boards and other major insulating
surfaces should be brushed or wiped with a dry cloth. The use of
liquid cleaners is not recommended because of the possible
deteriorating effects on the insulating materials.
TERMS AND CONDITIONS
Please refer to your copy of the "Terms and Conditions" for
warranty and
product liability information. The "Terms and
Conditions" are available online at www.maddoxtransformer.com
WHEN YOU NEED SERVICE
If you need service on products manufactured by Maddox we are
ready to serve you. Contact the nearest Sales Office for more
information.
RENEWAL PARTS
Address orders for renewal parts to the nearest Sales Office of the
Maddox.
Include a complete description of the part wanted,
plus the rating and serial number of the transformer.
Thus changes in
It is suggested that these
must
be
taken
way
and
voltage
or
The transformer high voltage and low
that
these
with
the
time.
500
volts
The
properly
CAUTION:
Particular
- 6 -
MIT100-15A
6/2011
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