T-80.01.pdf

ITEM NAME

Gainesville Regional Utilities Electric System Approved Materials Manual

3-10-14 KLC

9-12-14 KLC

3-4-15 KLC

9-22-15 KLC

6-7-16 KLC

TRANSFORMERS, 15 kV CONVENTIONAL

(TECHNICAL SPECIFICATIONS)

Revision Date:

Page: T-80.01

M o r e t h a n E n e r g y

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1. SCOPE

1.1 This specification covers the electrical and mechanical

requirements for single phase, sixty cycle, oil filled, self cooled, overhead type distribution transformers, in various kVA ratings for use on an overhead electric distribution system.

2. APPLICABLE DOCUMENTS

2.1 Unless otherwise indicated all transformers shall conform to the latest issue of the following American National Standards Institute (ANSI) documents:

(1) IEEE C57.12.00-2006 or latest revision, General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers.

(2) ANSI C57.12.20-2005 or latest revision, Overhead Type Distribution Transformers, 500 kVA and Smaller:

High Voltage, 34,500 Volts and Below: Low Voltage 7970/13800Y Volts and Below.

(3) Department of Energy (DOE), 10 CFR Part 431, Energy Conservation Program for Commercial Equipment: Distribution Transformers Energy Conservation Standards, Final Rule RIN 1904-AB08, [Docket Number: EE-RM/STD-00-550]

3. RATINGS

3.1 All ratings shall be based on not exceeding a 65 degree C.

winding temperature rise. The high voltage basic impulse insulation level (BIL) shall be 95 kV.

3.2 Transformers that currently exceed the January 1, 2016, DOE minimum efficiency levels shall remain at these efficiency levels. All other transformers shall meet or exceed the January 1, 2016, DOE minimum efficiency levels, effective 4/30/08.

3.3 High voltage: 7200/12470 Grd.Y

3.4 Low voltage: 120/240, 240/480, 277 as indicated on the

request for quotation.

3.5 Size (kVA): 10, 15, 25, 37.5, 50, 75, 100, 167, 250 as

indicated on the request for quotation.

TECHNICAL SPECIFICATIONS

15 kV CONVENTIONAL (POLE MOUNT) TRANSFORMERS

4. DESIGN AND CONSTRUCTION

4.1 Transformers shall be constructed in accordance with ANSI C57.12.20-2005, unless exception is taken by these specifications. Transformers shall be Class 0A and shall have a sealed-tank oil preservation system.

(1) All 120/240 volt units 50 kVA or smaller shall have interlaced secondary or an approved secondary surge protective device. Manufacturers shall submit surge protective device schemes for approval by the GRU Electric Standards Division prior to quotation.

(2) Transformer cores shall be constructed of high grade, cold reduced, grain oriented silicon steel with low hysteresis and eddy current losses.

Transformer cores shall not be constructed of amorphous metal.

(3) The length of the "B" lead, on all transformer sizes, shall be long enough to terminate over the "D" lead (X1) bushing. This will allow GRU the ability to parallel the transformer.

4.2 Tank Construction, Accessories and Finish

(1) The transformer tank shall be of all welded steel construction, which when fully assembled shall form an oil-tight sealed unit.

(2) Transformers shall be equipped for single position pole or platform mounting. Mounting hardware shall be constructed and positioned in accordance with

ANSI C57.12.20-2005.

(3) Lifting lugs (and a center lifting eye when available) shall be provided to allow the safe handling and lifting of the complete transformer unit when filled with insulating fluid.

(4) Each transformer shall be equipped with a non-resettable device which detects and provides external indication of internal transformer faults, and also incorporates pressure relief functionality. The approved device is manufactured by IFD Corporation or approved equal. This device shall be installed on the transformer and located within the Low-Voltage compartment.

Pressure relief shall be provided in accordance with paragraph 6.2.5.l or 6.2.5.2 of ANSI C57.12.20-2005.

(5) All exterior bolts, nuts, clamps and other non-painted metallic hardware shall be of a non-corrosive finish.

Electric System Approved Materials Manual

3-10-14 KLC

9-12-14 KLC

3-4-15 KLC

9-22-15 KLC

6-7-16 KLC

TRANSFORMERS, 15 kV CONVENTIONAL

(TECHNICAL SPECIFICATIONS)

Revision Date:

Page: T-80.02

M o r e t h a n E n e r g y

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4.5 Dielectric Oil

(1) The transformer shall be of sealed tank construction.

(2) The transformer shall remain effectively sealed for a top oil temperature range of -5 degrees C. to +105 degrees C.

(3) Transformers shall be furnished complete with oil which does not contain more than 1 ppm PCB’s and shall be labeled as not contaminated.

(4) The manufacturer shall certify that the liquid dielectric or any component of the liquid dielectric is not listed in the Federal Register, Vol. 45, No. 98, issued Monday, May 19, 1980, 40FR, Part 461, Appendix VIII Subpart D - Identification and Listing of Hazardous Waste.

4.6 Impedance

(1) The percent impedance (%IZ) as measured on the rated voltage shall be as follows:

kVA rating maximum %IZ minimum %IZ

10 through 75 3.0 1.5 100 through 167 3.0 1.6 250 5.75 5.0

(2) The tolerance for percent impedance on 250 kva transformers shall be plus or minus 7.5% of the maximum %IZ value specified above, and not less than the minimum %IZ above.

4.7 Labels

(1) Transformers shall be provided with the following labels, designed for outside application, permanently affixed to the front of each unit (see figure 2, this specification):

(a) kVA rating label

(b) "No PCBs" label in conformance with

EPA 40 CFR Part 761.

5. QUALITY ASSURANCE

5.1 Transformers shall be tested in accordance with

Paragraph 8 of ANSI C57.12.20-2005.

(6) The tank finish shall be of high grade paints employing a controlled baking process that will insure a protective coating which is exceptionally serviceable in areas of direct sunlight and high humidity. The color shall be light gray, No. 70, Munsell notation 5BG 7.0/0.4.

(7) The transformer size (kVA) shall be clearly and permanently marked on the front of the tank below the secondary bushings. These markings shall be large enough to be easily read from the ground at an installed mounting height of 50 feet.

(8) Transformers shall not deviate from the allowable dimensional and weight limitations shown in figure 1, of this specification.

4.3 Bushings

(1) The transformer shall have two cover mounted porcelain high voltage bushings, except that transformers with a low voltage rating of 277 shall have one cover-mounted porcelain high voltage bushing. The high voltage bushings shall have electrical characteristics as required in para-graph 6.1.1.1, and listed in Table 6 of ANSI C57.12.20-2005, for the 95 kV BIL insulation class.

(2) The low voltage terminals size shall be in accordance with Table 12 of ANSI ANSI C57.12.20-2005. Low voltage bushings shall be of the side wall type and mounted singly. Low voltage bushings shall be constructed of porcelain or epoxy or polymer and properly gasketed.

(3) The equipment number, location and arrangement of bushings shall be as shown in Tables 7 and 9 and Fig. 10 of ANSI C57.12.20-2005.

(4) The color of all bushings shall match Light Gray No.

70, Munsell notation 5BG 7.0/0.4.

4.4 Taps

(1) Transformers rated at 167 kVA or larger shall be provided with an internally located no load tap changer having (2) 2-1/2% steps above and

(2) 2-1/2% steps below the rated voltage, in accordance with paragraphs 6.2.1 of ANSI C57.12.20-2005. The tap changer shall be accessible through a gasketed handhole located in the tank cover, in accordance with paragraph 6.5.1 of

ANSI C57.12.20-2005.

Electric System Approved Materials Manual

3-10-14 KLC

9-12-14 KLC

3-4-15 KLC

9-22-15 KLC

6-7-16 KLC

TRANSFORMERS, 15 kV CONVENTIONAL

(TECHNICAL SPECIFICATIONS)

Revision Date:

Page: T-80.03

M o r e t h a n E n e r g y

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TM

6. TRANSFORMER EFFICIENCY

6.1 All Transformers shall meet or exceed the January 1, 2016, D.O.E. efficiency levels for liquid filled distribution transformers.

6.2 The efficiency levels shall be determined with the following formula:

% Eff = 100*(KVA*(0.5))/(KVA*(0.5) + NLL20 +

LL55*(0.5)^2)

6.3 D.O.E. January 1, 2016, Efficiency Levels for Single Phase Transformers:

KVA DOE Rule (%)

25 98.95

37.5 99.05 50 99.11 75 99.19 100 99.25 167 99.33

7. CERTIFIED TEST REPORTS AND SUBMITTAL DATA

REQUIRED

7.1 An approval drawing showing complete dimensional data, accessories and estimated weight shall be submitted for approval prior to fabrication.

7.2 At the time of delivery the manufacturer shall provide a

certified test report for all transformers in a given order, indicating the actual loss data for each unit delivered.

The certified test reports shall be included with the shipment, with an additional copy directed to the address in paragraph 6.3 of this specification.

7.3 Approval drawings and certified test reports shall be

sent to:

Gainesville Regional Utilities Energy Delivery Standards P.O. Box 147117, Station E2-C Gainesville, FL 32614-7117

8. BID EVALUATION AND AWARD

8.1 All bids received will be evaluated and awarded on the

basis of conformance to this specification, the lowest equivalent first cost and delivery. The method used to determine equivalent first cost is documented in A Method for Economic Evaluation of Distribution Transformers, published by the Edison Electric Institute, April 1981.

8.2 The equivalent first cost shall be determined with the

following formula:

Equivalent First Cost (in dollars) = (7.93 x No load Losses in Watts) + (1.33 x Load Losses in watts) + Price.

8.3 All bidders shall supply NO LOAD, LOAD and TOTAL losses on the form provided in the bid documents. All losses shall be quoted in watts at 20 degrees C. for No Load Losses and 55 degrees C. for Load Losses, per DOE, 10 CFR Part 431, Appendix A, Subpart K.

8.4 Quoted losses shall be the guaranteed average of all

transformers in a specific order of a given size and type.

However, no transformer shall measure less than the tolerances specified in the January 1, 2016, D.O.E. 10 CFR Part 431 minimum efficiency levels.

9. QUALITY CONTROL

9.1 Upon receipt, all transformers will be visually inspected by Gainesville Regional Utilities personnel to determine compliance with the specifications.

9.2 At the time of receipt the NO LOAD, LOAD and the TOTAL

losses will be measured by Gainesville Regional Utilities.

9.3 All losses quoted are the guaranteed average for all units contained in an order. However, no individual unit shall exceed the following tolerances:

(1) The measured NO LOAD LOSSES on any unit shall not exceed the quoted NO LOAD LOSSES by more than 10%.

(2) The measured TOTAL LOSSES on any unit shall not exceed the quoted TOTAL LOSSES by more than 6%.

10. NONCONFORMING TRANSFORMERS

10.1 Should any transformer fail to conform to the specifications in any way, the vendor shall replace the nonconforming transformer with a suitable transformer and bear all associated costs.

Electric System Approved Materials Manual

3-10-14 KLC

9-12-14 KLC

3-4-15 KLC

9-22-15 KLC

6-7-16 KLC

TRANSFORMERS, 15 kV CONVENTIONAL

(TECHNICAL SPECIFICATIONS)

Revision Date:

Page: T-80.04

M o r e t h a n E n e r g y

SM

TM

HV 7200, LV 277

(One High Voltage Bushing) kVA A B C WT. (lbs)

10 33" 19" 23" 310

15 33" 19" 23" 330

25 36" 22" 26" 490

37.5 40" 25" 29" 580

50 46" 25" 29" 700

75 49" 30" 34" 1000

100 50" 30" 34" 1150

167 52" 32" 36" 1450

250 54" 37" 41" 1800

1) Radiators shall not extend more than 6" from tank face.

Max. Allowable Dimensions and Weights figure 1.

HV 7200, LV 120/240, 240/480

(Two High Voltage Bushings)

Label Locations (All Sizes) figure 2.

NO PCB's