| REX
DRY TYPE POWER TRANSFORMERS are primarily designed for stepping
down high voltages from transmission and distribution systems to
common voltages in commercial, industrial, institutional or utility
applications. They are ideally suited for both indoor and outdoor
applications.
Dry Type Power Transformers require minimum maintenance
to provide many years of reliable trouble free service. Unlike liquid
fill transformers which are cooled with oil or fire resistant liquid
dielectric, dry type units utilize only environmentally safe, CSA
and UL recognized high temperature insulation systems. Every dry
type design provides a safe and reliable power source which does
not require fire proof vaults, catch basins or the venting of toxic
gasses. These important safety factors allow the installation of
dry type transformers inside buildings close to the load, which
improves overall system regulation and reduces costly secondary
line losses.
REX POWER MAGNETICS PROVIDES DRY TYPE POWER TRANSFORMERS
UP TO 10MVA AT 35,000V AND 150KV BIL.
A
sampling of their applications is:
- Power Distribution
- Indoor or Outdoor Primary and Secondary Unit
Substations
- Grounding Transformers
- Mining, Pulp and Paper Application Transformers
- Corrosion Resistant Transformers for Marine
Distribution and Power
- Low Electro Magnetic Field Emission Transformers
for Hospital and Institutional use
- Traction Power Rectifier Transformers for transit
Systems
- Motor Starting & Drive System Applications
- High Harmonic and Intermittent Load Applications
- And Many other applications…
Rex
Power Magnetics Technical Capability
We have the engineering capability to design,
manufacture and test all standard and specialty dry type transformers,
related magnetic products, and power transformers rated up to 10,000KVA
and 150kv BIL. All Rex Power Magnetic Products are CSA certified
and most are UL listed including Dry Type Power Transformers.
Standard
Rex Power Transformer Designs
- CAST COIL TRANSFORMERS - The ultimate
Dry Type Transformer for use in harsh environments.
- DRIVE ISOLATION TRANSFORMERS
- Specifically designed to meet the requirements of AC and DC
variable speed drives or rectifier units. They are typically available
in 6-pulse, 12-pulse, 18-pulse or 24-pulse configuration.
- ELECTROSTATIC SHIELDED TRANSFORMERS
- To protect systems from high frequency transients that may occur
due to switching and loading on distribution lines.
- ENERGY EFFICIENT TRANSFORMER e-Rated™:
A transformer designed to perform with lower than standard conductor
and total losses which results in greater life expectancy, lower
operating costs and significant overload capabilities. Rex e-Rated™
Transformers are built to meet and exceed CAN/CSA C802 and NEMA
TP-1 standards.
- K-FACTOR RATED POWER TRANSFORMERS
for use where harmonic currents are present. Available in all
ratings ranging from K4, K9, K13, K20 and K30.
- LOW ELECTRO MAGNETIC FIELD EMISSION
TRANSFORMERS - Designed to allow very low electro-magnetic
field emission outside of the enclosure.
- LOW SOUND LEVEL TRANSFORMERS designed
to emit lower than normal audible hum (noise).
- SPECIAL FREQUENCY DESIGNS - To
operate at frequencies other than the normal 60Hz.
- VPI & EPOXY DIPPED WINDINGS
- All Rex Power Transformer windings are vacuum pressure impregnated
in polyester resin. For applications with harsh operating conditions
or where airborne contaminants are present, an epoxy resin coating
can be added to the polyester impregnated coils.
Insulation
The lifespan of the insulation is the main determinant
in the life of the transformer. The working temperature of the transformer
affects the life of the insulation. This temperature is a combination
of the unit's temperature rise, the ambient temperature and the
hot spot temperature.
Rex Power Transformers are manufactured with class
220OC Insulation materials. Only high temperature resistant materials
of the best quality are used including Nomex Aramid papers, Silicone
or Polyester Coated Fiberglass, Nomex Sleeving, Glass Tapes and
Polyester/Glass Duct Sticks.
Core
Construction
Every Rex Power Transformer core is constructed
from electrical grade, cold rolled grain oriented silicone steel
of M5 grade or better. Grain oriented steel is utilized for its
superior magnetic permeability, low hysteresis and eddy current
losses. Steel is cut into individual laminations on automated cutting
machines to ensure precision and consistency.
Core laminations are meticulously stacked on specially
designed jig tables. The individual laminations of the core are
then clamped together by structural grade steel core clamps.
Once the core is complete, an epoxy coating is
applied to guard against corrosion.
At Rex Power Magnetics, we construct our transformer
cores with either rectangular or cruciform configuration. The core
configuration is chosen to provide the most efficient unit with
the best weight and dimension factors. Both configurations may utilize
either the Butt & Lap stacking method or the Full Miter cut
stacking method.
Standard
Factory Testing
Every power transformer by Rex Power Magnetics
receives the following standard production tests.
- Resistance Measurement
- Ratio Test
- Polarity and Phase Relation Test
- No-Load Loss and Excitation Current Test
- Load Loss Test
- Impedance Test
- Applied Potential Test
- Induced Potential Test
Other Tests available as options:
- Basic Impulse Insulation Level (BIL)
- Temperature Rise Test
- Partial Discharge Test (Corona)
- Sound Level Test
Optional
Accessories
- Provision for Future Fans or Fan Packages (ANF)
completely installed with or without Control Power
- Buss Co-ordination with primary and secondary
switchgear
- Dial (Analog) or Digital Thermometers to monitor
winding temperatures
- Neutral Ground Resistors (NGR)
- Strip Heaters to avoid condensation when the
transformer is not energized
- Ground Fault Relays (GFR)
- Anti-Vibration mounting to reduce transformer
hum (sound level)
- Provision for Seismic mounting or complete
Seismic Snubbers and Restraints
- Lighting Arrestors (LA) available in Distribution,
Intermediate or Station Class
- Provision for Buss Duct Entry
- Fully Insulated Buss
- Mimic Buss
- Kirk-Key Interlock Systems
- Special Enclosures available in Nema-1, Nema-2,
Nema-3R (with or without Filters), Nema-4, Nema-12
Typical Dimensions
and Weight
* Information is
subject to change without prior notice.
* The e-Rated trademark is the
property of The e-Rated Corporation.
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