Section 48 19 23.04 26 Paragraph 2.1.5 - Amendment 3.pdf

GSU Transformer Supply Old Hickory Lock W912P519R0004 Old Hickory Tennessee and shall be of a design that has an established record of satisfactory operation with the type of oil preservation system specified. The transformers shall be manufactured suitable for shipment by sea transportation, railcar, and trucking by heavy hauler.

2.1.2 Transformer Limiting Dimensions and Equipment Arrangement

The transformer manufacturing, configuration, and dimensions shall be as indicated on the contract drawings, and the transformers shall not exceed the limiting dimensions.

2.1.3 Requirements

Except as otherwise specified herein, the transformers, accessories, and spare parts shall conform to the applicable requirements of IEEE C57.12.00 , IEEE C57.12.10 , IEEE C57.12.70 , IEEE C57.12.80 and IEEE C57.12.90 .

2.1.4 Standard Products

Material and equipment provided with the transformers shall be standard products from a manufacturer regularly engaged in their production, and shall essentially duplicate items that have been in satisfactory use for at least 3 years prior to bid opening, unless otherwise specifically approved. All materials shall conform to the requirements of these specifications. Materials shall be of industrial quality, free from defects and imperfections, of recent manufacture, and of the classification and grades designated. If the Contractor desires for any reason to deviate from the standards designated in these specifications, a statement shall be submitted for approval describing the exact nature of the deviation, including complete specifications for the materials that are being proposed for use. Submit for approval Descriptive data for all transformer equipment, to include the following:

a. Catalog and technical data for all transformer components, including electrical core steel (including country of origin), winding conductors (including country of origin), de-energized tap changers, fiber-optic probes, bushings, current transformers, valves, gasket materials and radiators

b. Catalog and technical data for all transformer mounted accessories, oil preservation system components, control cabinet equipment, insulated wire and cable, and conduit systems.

2.1.5 Ratings and Electrical Characteristics

The ratings and electrical characteristics of the transformer shall be as follows:

a. Continuous ratings, at the 65 degrees-C temperature rated temperature rise, on all taps, kVA:

(1) ONAN Rating: 75,000

(2) ONAF Rating: 100,000

b. Frequency, Hz: 60

c. Number of phases: 3

d. Rated voltage, kV:

SECTION 48 19 23.04 26 Page 15

GSU Transformer Supply Old Hickory Lock W912P519R0004 Old Hickory Tennessee

(1) High-voltage windings: 161 x 69

(2) Low-voltage windings: 13.2

e. Winding connections:

(1) High-voltage windings: Wye

(2) Low-voltage windings: Delta

f. Impedance, at ONAN rated current, subject to IEEE tolerances, percent:

(1) 69 kV: 7.5

(2) 161 kV: minimum 7.5, maximum 12

g. Angular displacement, low-voltage lags high-voltage by, degrees:

h. Basic impulse insulation levels (BIL), kV:

(1) Line ends of the high-voltage windings, not less than: 650

(2) Neutral ends of the high-voltage windings, not less than:

(3) Low-voltage windings, not less than: 110

i. Taps in low voltage windings: None

j. Taps (full capacity) in high voltage winding

(1) Tap A, nominal voltage: 69 kV

(2) Tap B, nominal voltage: 161 kV

(3) Tap 1, percent of high-voltage tap A/B selection: 105.0

(4) Tap 2, percent of high-voltage tap A/B selection: 102.5

(5) Tap 3, percent of high-voltage tap A/B selection: 100.0

(6) Tap 4, percent of high-voltage tap A/B selection: 97.5

(7) Tap 5, percent of high-voltage tap A/B selection: 95.0

k. Maximum no-load losses at 69 kV and rated frequency, kW: 90

l. Maximum load losses at maximum ONAF rated kVA, 69 kV, and 1.0 power factor, kW: 180

m. Maximum average sound level at 69 kV and rated frequency, with all cooling groups in operation, dB: 68

n. Maximum transformer total weight, completely assembled and oil filled with all accessories installed, pounds: N/A

2.1.6 Unusual Service Conditions

The transformers will not be subject to any unusual service conditions, as defined by IEEE C57.12.00 , paragraph 4.3.

2.2 STRUCTURAL DESIGN CRITERIA AND SEISMIC CALCULATIONS

Structural design criteria and seismic calculations shall be provided for the transformers, to include the main tank and all major components such as bushings, cooling equipmentand cabinets.

SECTION 48 19 23.04 26 Page 16