Transformer specs.docx
DOCX document 20 KB Posted
- Attached to
- 300 and 750KVA transformers Federal contract opportunity
- Solicitation number
- 52090PR240000195
About this file
This document contains the specifications for 750 kVA and 300 kVA isolation transformers required under a solicitation issued by the U.S. Coast Guard, a civilian agency within the Department of Homeland Security. The transformers must be dry type, pad mounted, with 5-step tap changers, space heaters, and electrical warning signs. They must be constructed of 304 stainless steel, with a 2-part epoxy paint finish in light gray color, and housed in a NEMA 3R enclosure. The transformers must be 115 °C epoxy encapsulated dry type, capable of 115% continuous overload without exceeding insulation ratings, and have six voltage adjusting taps. Minimum efficiency must meet NEMA Class 1 standards. The transformers will be installed at the Coast Guard Base Honolulu-Industrial Production Facility. Interested vendors should contact the Contracting Officer, Justin Hinkle, or the technical representative, Jared Hamilton.
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Text version
750kva/300kva Isolation Transformer Specifications
1. Isolation Transformers: 750 kva and 300 kva isolation transformers. Delta-Delta 480-480 volts. Copper windings. Transformer shall be dry type. Pad mounted. 5 step tap changer. Space heater as required (480V). Electrical Warning signs on all 4 sides of the transformer. The isolation transformer tap shall be lowered for 450 volts. This is the operating voltage of the 270’ Harriet Lane.
NEMA ST 20, general purpose, dry-type, self-cooled. 304 Stainless steel construction and painted with a 2 part epoxy. Standard transformer color is light gray. Provide transformers in NEMA 3R 304 SS enclosure.
Transformer will be installed outdoors and shall have be a 115 degrees C epoxy encapsulated dry type transformer. Transformer of 115 degrees C temperature rise shall be capable of carrying continuously 115 percent of the nameplate kVA without exceeding insulation rating.
Transformers shall be provided with six (6) voltage adjusting taps (2 above and 4 below rated primary voltage). They shall also be equipped with electrostatic shields between the primary and secondary winding, as well as between the windings and the core. Minimum efficiency, based on factory test results, shall not be less than NEMA Class 1 efficiency as defined by NEMA TP 1.
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