Energy efficient dry-type transformers (encapsulated, ventilated or non-ventilated), 600 Volt Class, isolation type, single and three phase, through 500 kVA. Indoor and outdoor models available.
General Purpose:
Designed to meet the high energy efficiencies required by NEMA Standard TP-1, T2, T5 and S5.
Low Temperature Rise:
Designed to limit the temperature rise of the core and coil assemby to either 80°C or 115 °C above a 40 °C ambient. Reduction in temperature rise increases reliability.
K-Factor:
Designed to withstand the electrical anomalies associated with solid state equipment and DC power supplies (excluding SCR variable speed motor drives).
Copper Wound:
General purpose transformers with copper windings.
Applications:
Any situation where the available voltage must be changed to accomodate the voltage required by the specific electrical circuit or connected equipment. For many electrical circuits, the National Electric Code (NEC) requires a separately derived neutral secondary connection provided by Delta-Wye connected transformers. Typical applications include:
- Hospitals Office Buildings
- Industrial Plants Schools
- Commercial Buildings Shopping Centers
- Apartment Buildings High Rise Buildings
- Institutional Buildings
Distribution transformers can be located close to the load. No vaults are required for installation and no long, expensive feeder lines are needed. Common applications include inductive and resistive loads such as motors, lighting and heating.
Hevi-Duty transformers are manufactured to meet applicable industry standards, are listed in accordance with UL506 and UL1561 specifications and are classified as isolation transformers.
Full Load Current Charts:
Are there any special application considerations?
- For ambient conditions over 40°C, derate the transformer nameplate KVA by 8% for each 10°C above 40°C.
- For high altitude applications, derate the transformer nameplate KVA by 0.3% for every 330 feet over 3300 feet above sea level. This assures proper transformer convection cooling.
- Some applications may require a transformer design that limits the BTU output of the unit at full load or a design to withstand and mitigate specific electrical anomalies. For these applications, see the the following specialty transformers:
Three things to keep in mind:
- Motor horsepower charts are based on 1800 RPM squirrel cage induction motors. If using another type of motor, check running amperage against the chart and adjust as necessary.
- Increase required transformer KVA by 20% if motors are started more than once per hour.
- If your motor service factor is greater than 1, proportionally increase full load amperage.
For selection steps, overcurrent protection and fuse recommendations click here.
Please click on the links to the right for more information.
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