| Distribution Transformers |
|
|
|
Distribution Transformers
Single- and Three-Phase
- Ventilated, NEMA 3R enclosure standard
- Suitable for indoor or outdoor applications
- Upright mounting only
- 220ºC insulation system
- 150ºC rise standard; 115°C or 80°C rise optional
- Available in single-phase ratings 15–333 kVA
- Available in single-phase ratings 25–167 kVA; in three-phase ratings 15–1500 kVA
Transformers that are currently specifically excluded from the scope of DOE 10 CFR Part 431 include:
- Liquid-filled transformers below 10 kVA
- Dry-type transformers below 15 kVA
- AC and DC drives transformers
- Rectifier transformers designed for high harmonics
- Autotransformers
- Non-distribution transformers, such as UPS transformers
- Special impedance or regulation transformers
- Regulating transformers
- Sealed and non-ventilated transformers
- Machine tool transformers
- Welding transformers
- Transformers with tap ranges greater than 15%
- Transformers with a frequency other than 60 Hz
- Grounding transformers
- Testing transformers
Features, Benefits and Functions
- 60 Hz operation (except as noted)
- Short-term overload capability as required by ANSI
- Meet NEMA ST-20 sound levels
- Meet federal energy efficiency requirements for dry-type transformers effective as of January 1, 2010
|
|
|
