2022200082_A1_Attachment B_Transformers.pdf
PDF 18 KB Posted
- Solicitation number
- S-KE0010-00002866
- Issued by
- Lane County, Oregon
About this file
This document is Attachment B - Low-Voltage Distribution Transformers for Invitation to Bid (ITB) 2022200082 issued by Lane County, Oregon and the City of Eugene, Oregon. The ITB is for the procurement of switchgear, transformers, and other electrical components, excluding installation. The key technical requirements for the low-voltage distribution transformers include: 15 kVA or larger capacity, compliance with DOE 2016 energy efficiency standards, copper windings, ventilated NEMA Type 1 enclosures, and testing per IEEE standards. The transformers must have a primary voltage of 480V and a secondary voltage of 208Y/120V. The ITB does not specify quantities, response dates, award dates, or contract term details.
Regarding pricing, the ITB does not provide any details on pricing terms, set-asides, incumbent contractors, funding amounts or sources. The ITB is focused solely on the technical specifications and testing requirements for the low-voltage distribution transformers to be procured under this contract opportunity.
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Text version
ITB 2022200082 Attachment B
LOW-VOLTAGE DISTRIBUTION TRANSFORMERS 262213 - 1
SECTION 262213 - LOW-VOLTAGE DISTRIBUTION TRANSFORMERS
1.1 SUMMARY
A. Section includes distribution, dry-type transformers with a nominal primary and secondary rating of 600 V and less, with capacity specified.
1.2 ACTION SUBMITTALS
A. Product Data:
1. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes for each type and size of transformer.
2. Include rated nameplate data, capacities, weights, dimensions, minimum clearances, installed devices and features, and performance for each type and size of transformer.
B. Shop Drawings:
1. Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.
2. Vibration Isolation Base Details: Detail fabrication including anchorages and attachments to structure and to supported equipment.
3. Include diagrams for power, signal, and control wiring.
1.3 DELIVERY, STORAGE, AND HANDLING
A. Responsibility for receipt, storage and handling of switchgear will be assigned to the Electrical
Contractor who will be installing the switchgear. Selection of this Contractor will be made under a separate contract.
PART 2 - PRODUCTS
2.1 GENERAL TRANSFORMER REQUIREMENTS
A. Description: Factory-assembled and -tested, air-cooled units for 60-Hz service
B. Transformers Rated 15 kVA and Larger:
1. Comply with 10 CFR 431 (DOE 2016) efficiency levels.
2. Marked as compliant with DOE 2016 efficiency levels by an NRTL.
2.2 DISTRIBUTION TRANSFORMERS
A. Cores: Electrical grade, non-aging silicon steel with high permeability and low hysteresis losses.
1. One leg per phase.
2. Grounded to enclosure.
B. Coils: Continuous windings without splices except for taps.
1. Coil Material: Copper.
2. Internal Coil Connections: Brazed or pressure type.
3. Terminal Connections: Bolted.
ITB 2022200082 Attachment B
LOW-VOLTAGE DISTRIBUTION TRANSFORMERS 262213 - 2
C. Enclosure: Ventilated.
1. NEMA 250, Type 1: Core and coil shall be encapsulated within resin compound to seal out moisture and air.
2. KVA Ratings: Based on convection cooling only and not relying on auxiliary fans.
3. Wiring Compartment: Sized for conduit entry and wiring installation.
4. Finish: Comply with NEMA 250. Finish Color: Gray weather-resistant enamel.
D. Taps: Two 2.5 percent taps above and two 2.5 percent taps below normal full capacity.
E. Insulation Class: 220 deg C, UL-component-recognized insulation system with a maximum of
115 deg C rise above 40 deg C ambient temperature.
F. Grounding: Provide ground-bar kit or a ground bar installed on the inside of the transformer enclosure.
G. Ratings
1. 112.5 kVA
2. Primary: 480 Volts. Secondary 208Y/120 Volts.
2.3 IDENTIFICATION
A. Nameplates: Self-adhesive label for each distribution transformer. Self-adhesive labels are specified in Section 260553 "Identification for Electrical Systems."
2.4 SOURCE QUALITY CONTROL
A. Test and inspect transformers according to IEEE C57.12.01 and IEEE C57.12.91.
1. Resistance measurements of all windings at rated voltage connections and at all tap connections.
2. Ratio tests at rated voltage connections and at all tap connections.
3. Phase relation and polarity tests at rated voltage connections.
4. No load losses, and excitation current and rated voltage at rated voltage connections.
5. Impedance and load losses at rated current and rated frequency at rated voltage connections.
6. Applied and induced tensile tests.
7. Regulation and efficiency at rated load and voltage.
8. Insulation-Resistance Tests:
a. High-voltage to ground.
b. Low-voltage to ground.
c. High-voltage to low-voltage.
9. Temperature tests.
END OF SECTION 262213
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