GENERAL 1.1 This specification covers the electrical and mechanical characteristics of ThreePhase, 60Hz, biodegradable-oil immersed, self-cooled, tamper resistant, PadMounted Distribution Transformers. 1.4 All characteristics, definitions, and terminology, except as specifically covered in this specification shall be in accordance with the latest revision of the following ANSI, IEEE, Department of Energy, and NEMA Standards. • C57.12.00 - IEEE Standard General Requirements for Liquid -Immersed Distribution, Power and Regulating Transformers. • C57.12.28 – IEEE Standard for Pad-Mounted Equipment - Enclosure Integrity • C57.12.34 – IEEE Standard Requirements for Pad-Mounted, Compartmental-Type, Self-Cooled, Three-Phase Distribution Transformers (2500 kVA and Smaller) – High Voltage: 34500GrdY/19920 Volts and Below; Low-Voltage: 480 Volt 2500 kVA and Smaller. • C57.12.90 - IEEE Standard Test Code for Liquid- Immersed Distribution, Power and Regulating Transformers and IEEE Guide for Short-Circuit Testing of Distribution and Power Transformers. • C57.12.91 – IEEE Guide for Loading Mineral Oil-Immersed Transformers • 10 CFR Part 431 – Department of Energy – Energy Conservation Program for Commercial Equipment: Distribution Transformers Energy Conservation Standards; Final Rule 2.0 RATINGS 2.1 All ratings shall be for 60 Hz alternating current, self-cooled transformers capable of continuous operation at rated KVA without exceeding either a 65 °C average temperature rise or an 80 °C hot spot temperature rise. 2.2 The transformer shall be designed in accordance with this specification and have one of the following kVA ratings: • 45 • 75 • 112.5 • 150 • 225 • 300 • 500 • 750 • 1000 • 1500 • 2000 The applicable kVA ratings shall be specified on the Inquiry Sheets.
