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| Repairs,
Fluid Purification & Installations |
Repairs
Repairs
extend the life and improve the reliability
of transformers, circuit breakers, switches
and other high voltage equipment. TSI has
broad repair capability. Services provided
include:
Transformers, Voltage Class Thru
765KV
- Cleaning
or Replacing bushings
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Replacing pumps, coolers, fans and radiator assemblies
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Re-gasketing
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Replacing gauges
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Internal inspection and repairs
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Load Tap Changer servicing
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Testing: Doble Power Factor, Dielectric
absorption, TTR
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Painting on-site
Circuit Breakers, Low Voltage
600 Volt Class
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Circuit Breaker disassembly, cleaning,
lubrication and re-setting
- Upgrades
to electronic trip units
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Circuit Breaker primary and secondary
injection test
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Other
Services
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Fluid
Purification
TSI
has been an industry leader in oil purification
for over 52 years. TSI has three truck-mounted
oil purification systems that provide the
following:
- Re-refining
to remove acids and particulate material
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Dehydrating to remove dissolved water
vapor
- Degassing
to remove other gases such as Acetylene,
Ethylene, Ethane, Methane, Hydrogen,
Carbon Monoxide, and Carbon Dioxide.
Most transformers can be processed while
energized provided there is adequate clearance
from bushings and safe access to fill
and drain valves.
TSI’s
process uses in line moisture monitoring,
on-site dielectric test and fluid quality
test for process control.
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Installations
Vacuum
Fills and On-Site Dry-Out
TSI’s vacuum fill process ensures
that a new transformer is thoroughly dehydrated
prior to being put into service. The steps
in the vacuum fill process are:
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A pressure test to ensure the vacuum
integrity of the transformer
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A 24-hour (or other time as directed
by the customer) vacuum hold at less
than 1 mm to draw moisture from the
core and coil.
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If desired, the transformer may be filled
with dry Nitrogen and held under pressure
for 12 to 24 hours to allow a dew point
test to be performed to verify that
the desired moisture level has been
achieved.
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If desired, the oil can be dehydrated
while in tank trailers prior to filling
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The oil is passed through TSI’s
dehydration system where it is further
heated and vacuum dehydrated.
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The transformer is kept under vacuum
while it is being filled slowly with
hot oil. This evaporates additional
residual moisture.
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If desired, vacuum may be held for several
hours after the oil fill is completed.
- On-Site
dry out is accomplished by circulating
hot oil while the transformer is under
vacuum. A cold trap is used to measure
the amount of moisture removed from
the transformer.
Installation & Acceptance
Testing
TSI’s
experienced crews and six licensed High
Voltage Electricians are capable of installing
and acceptance testing any transformer
and switchgear, large or small. TSI has
a crane truck for equipment up to 9000
lbs and rents a crane for larger installations.
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