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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 field and shop repair capability. Services provided
include:
Transformers, Voltage Class Thru
765KV
- Cleaning
or Replacing bushings & insulators
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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: Power Factor, Dielectric
absorption, Transformer Turns Ratio, Insulation and Winding Resistance
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Painting on-site
- Transformer reconditioning
- Adding AGE inhibitor to perchlorethelyne (“perc”) based fluids (Wecosol, System 50, Transclene)
Circuit Breakers, Low Voltage
600 Volt Class
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Circuit Breaker disassembly, cleaning,
lubrication, exercising and re-setting
- Upgrades
to electronic trip units
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Circuit Breaker primary and secondary
injection test; Ductor test
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Other
Services
- Assembly
and disassembly
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Disposal
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Electrical test
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Oil
sampling
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Load Studies
- Asset Recovery
- System 50 PCB reduction
- Reclass 50 silicone servicing
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Fluid
Purification
TSI
has been an industry leader in transformer oil treatment since 1952. TSI has three truck-mounted
oil purification systems that provide the
following treatment of 10c mineral oil, cable oil, Rtemp and bio-fluids:
- Re-refining
to remove acids and particulate material
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Dehydrating to remove free and dissolved water, including insulation dry-out of the windings.
- Degassing
to remove other dissolved combustible gases such as Acetylene,
Ethylene, Ethane, Methane, Hydrogen and Carbon Monoxide, and Carbon Dioxide.
- Adding of BHT oxidation inhibitor to oil filled transformers.
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 tests and fluid quality
tests for process control.
TSI also has portable equipment to degas and dehydrate silicone filled transformers.
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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 licensed High
Voltage Electricians are capable of installing, dressing
and acceptance testing of transformers
and switchgear, large or small. TSI has
a crane truck for equipment up to 9000
lbs and rents a crane for larger installations. We also have tankers and transformer oil treatment equipment for any size job.
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