Transformer Dryout System (TDS®)
Dehydrate wet transformers without taking them out of service!
APPLICATIONS
- Dry wet transformers and insulation
- Dry transformers not braced for vacuum
- Dry transformers that cannot be taken out of service
BENEFITS
- Transformer remains in-service during process
- Reduce transformer dry-out costs
- Improve oil dielectric values
- Improve transformer power factor
- Operates continuously unattended
- Extend oil service life
- Extend transformer service life
The TDS® transformer dry-out system incorporates all
the necessary features to allow a transformer to remain
in-service while moisture from its insulation is effectively
removed. The system is safe with several alarm features
that shut the system off, isolating it from the transformer,
in the event of any abnormal signal. The TDS5-1 unit
provides a non-intrusive, cost effective and convenient
method of maintaining transformers in a dry condition.
In addition, once the transformer is dried, the system
can be retrofitted with Activated Alumina cartridges to
reduce acidity in the transformer oil. This flexibility allows
increased oil processing application compared to heat and
vacuum systems.
SYSTEM OVERVIEW
The TDS® oil processing system is designed to allow
a transformer under load to dry itself out. A quantity
of four part number SD-1107 Superdri® cartridges are
installed in the filter vessel, through which oil is processed
at a rate of 5 gpm. The filtering system removes dissolved
water from oil to less than 10 ppm, and includes 1 micron
nominal particle removal capabilities. The process does
not affect dissolved gas in oil, and does not remove oil
oxidation inhibitors. The system is complete with all
components necessary to monitor the mechanical and
electrical operating conditions of the unit. The system
includes components to purge air during start up and
after filter changes.
PROCESS OVERVIEW
The on-line dryout process is designed for safe, unattended,
24-hour operation. The system suction line is connected
to the transformer bottom fill connection. The oil is then
returned from the TDS® to a top connection valve.
The number of cartridge changeouts required to dry the
transformer insulation to an acceptable level and cartridge
change-out intervals will vary according to moisture
content and moisture transfer rate from the insulation
to the oil. One set of Superdri cartridges will remove a
minimum of 1.4 gallons of dissolved water from the oil.
Periodic moisture readings, from both the inlet to and
outlet from the system can be taken to determine the
amount of moisture being removed and are also used
to determine when cartridges should be changed.
ORDERING INFORMATION
TDS5-1 Standard unit, 120 vac, 1-ph, 60 Hz power requirement
746Y012 Moisture Sensor Option, 120 vac, 1-ph, 60 hz
SD-1107 Superdri® cartridge, 4 required per change-out (not included with unit)
LB-1107 Activated alumina cartridge for acid removal, 4 required per changeout
Companies that use the Velcon TDS® Transformer Dry-out System
Partial list - more than 200 units sold in the last ten years!
Ameren Union Electric
Bonneville Power
Carolina Power & Light
Con Edison
Consumers Energy
CXY Chemicals
Delmarva Power & Light
Duke Energy
Energy Services New Zealand
Georgia Power
Gulf Power
Los Angeles Department of Water & Power
Metropolitan Edison
Mississippi Power
NIPSCO
Occidental Chemical
Ontario Power Generation
Pennsylvania Power & Light
Portland General Electric
Potomac Electric Power Company
Progress Energy
Public Service Company of Oklahoma
San Diego Gas & Electric
Southern California Edison
Southern Illinois Power
Southern Mississippi Electric
Tri State G & T
US Army Corp or Engineers
US Dept of Energy WAPA
West Oregon Electric Coop
