Exhibit B - Single Phase Pole-Mount Transformer Specs.pdf

NORTHERN WASCO COUNTY P.U.D.

Material Specification

Single Phase Pole-Mounted Transformers

MATERIAL SPECIFICATION

NORTHERN WASCO COUNTY PEOPLE’S UTILITY DISTRICT

POLE-MOUNTED TRANSFORMERS

May 5, 2025 Pole Mounted

1. Scope

a. This section covers pole mounted, single-phase, 60Hz alternating current, oil immersed, self-cooling, distribution transformers suitable for operation on Northern Wasco County PUD’s (NWCPUD) 12,470/7200Y distribution system.

i. Transformers shall be designed for outdoor operation installed on power poles to provide power distribution to residential, commercial, industrial, agricultural, and institutional loads.

ii. All transformers shall be copper winding only with steel core.

2. Reference Standards

a. All transformers shall be manufactured and tested according to the latest editions, revisions, and amendments to the applicable standards of NEMA, ANSI and IEEE except as modified herein.

b. Transformers shall conform to standard efficiency levels for liquid immersed distribution transformers in Department of Energy final rule 10 CFR 431.

3. Load Side Voltage

a. Low voltage rating shall be:

i. 120/240 or 240/480 volts provided by two windings and three low voltage terminals.

1. Four low voltage terminals on transformers above 100kVA.

ii. 277 volts provided by one winding and two low voltage terminals.

4. BIL Rating

a. All transformers supplied under this standard shall have:

i. BIL rating on the high side 95kV.

ii. BIL rating on the low side 30kV.

5. Bushings

a. Two (2) high voltage bushings.

i. The high voltage bushings shall be the cover type and mounted separately.

b. Low voltage bushings.

i. The low voltage terminals shall be of the sidewall type, mounted separately, and solderless. The number of low voltage terminals shall be three for transformers 100kVA and less and four low voltage terminals on transformers above 100kva.

1. Two terminals for 277 volts secondary.

6. Grounding

a. One ½ -13 standard thread female provision for tank grounding shall be provided and equipped with CU ground stud term connector with a range of 6 Sol CU– 1/0 Str CU.

i. Example would be Hubbell Fargo GC207

7. Pressure Relief

a. Each transformer shall be equipped with a non-resettable device which detects and provides external indication of internal transformer faults. It shall also incorporate pressure relief functionality. The approved device is manufactured by IFD Corporation.

8. Accessory Equipment Location

a. The tank configuration and equipment location shall be of the single position mounting unless specified otherwise in the PO.

9. Labeling and Nameplate

a. The manufacturer shall place a sticker on the transformer in the traditional area indicating the KVA of the transformer.

b. An Aluminum nameplate shall be securely attached to each transformer.

i. Nameplate information shall be in accordance with IEEE C57.12.00 section 5.12.2 nameplate A.

ii. The nameplate shall be mounted on the lower support bracket.

10. Taps

a. Transformers rated at 167kVA and greater shall be provided with four (4) taps, two 2-1/2% taps above and two 2-1/2 taps below normal.

i. The tap changer handle shall be operable from outside the transformer tank.

11. OIL

a. The dielectric coolant shall be listed less-flammable fluid meeting the requirements of National Electrical Code section 450-23 and to comply with National Electrical Safety Code IEEE C2-2002, Section 15.2.A.2.

i. The dielectric coolant shall be new (unused), non-toxic, non-bioaccumulating and be readily and completely biodegradable per EPA OPPTS 835.3100 testing guidelines.

ii. The fluid shall be 100% derived from edible seed oils and food grade performance enhancing additives.

iii. The fluid shall be certified to comply with the US EPA Environmental Technology Verification (ETV) Requirements and tested for compatibility with transformer components.

1. Example FR3

b. Dielectric fluid furnished shall contain Zero (0) parts per million PCB (polychlorinated biphenyl).

c. The transformer nameplate shall be stamped with “No PCBs”, type of oil and gallons.

d. The manufacture shall provide NWCPUD at a minimum of once a year or when requested the Safety Data

Sheet (SDS) of the chemicals contained on or in any transformer; Or when any changes, chemicals used or medical hazards change.

12. Tank Finish

a. The manufacture shall apply a corrosion-resistant finish for the transformer meeting or exceeding the requirements of IEEEC57.12.28.

b. The outside of the transformer shall be properly prepared and primed prior to applying the finish coat.

c. The manufacture shall prepare each transformer by means of either a phosphatizing bath or media blasting.

The transformer shall then be primed with an epoxy or vinyl primer leaving no less than two (2) mils dry thickness.

i. All surfaces on the transformer exterior shall be primed, including under and around all access points and doors.

d. The transformer finish coat shall be a semi-gloss polymer, scratch resistant, free of runs and sags, no less than one (1) mil dry thickness.

e. The transformer finish coat color shall be neutral sky-gray ANSI #70 per ANSI C57.12.28

13. Tests

a. Each Transformer shall receive complete tests at the factory in accordance with the latest ANSI standards. At the option of the NWCPUD, transformers may be tested for acceptance upon receipt.

b. All transformers manufactured under this specification shall be tested for core and winding (copper) losses at 85C, percent impedance at 85C, and exciting current (100% voltage and subject to a full wave voltage impulse). Actual loss data shall be prepared in accordance with the bid form.

c. The manufacture shall supply verification that the design has passed short circuit criteria per ANSI C57.12.00 and C57.12.90 latest revisions.

d. The losses submitted by the bidder for bid evaluation shall be considered as guaranteed losses by NWCPUD.

e. Certified test reports shall be furnished to NWCPUD at the time of delivery or invoicing of transformers.

Invoices must reference serial number of transformers, bid item and quoted losses.

f. A suitable test to verify sealed tank construction shall be completed.

g. A durable test tag, sticker, shall accompany each transformer, stating that the transformer, after final assembly, has been tested and is suitable for normal use at rated voltage. The test tag shall show the name or number of the person responsible for the testing and affixed to the transformer.

14. Quotation Evaluation

a. Transformer quotation analysis will be based on compliance with the standards, purchase order requirements, cost of transformer losses, product quality, and the base price with a provision for escalation adjustment.

i. Product quality will be determined by past products delivered to NWCPUD.

b. If the overall evaluation of tested losses differs from the overall evaluation of losses guaranteed in the manufacturer’s proposal, the difference will be credited to NWCPUD.

c. NWCPUD expects all bids to conform to these specifications. Any exception is cause for rejection, at NWCPUD’s discretion.

15. Acceptance

a. Prior to the transformers being manufactured approval drawings to include a list of accessory material with manufacture and catalog identifications of the final product shall be submitted to NWCPUD for approval.

Total Evaluation = cost of transformer + cost of losses

Where:

Cost of Transformer = Base price plus escalation to date, including oil, if any.

Cost of Losses = $ 3.50 x (KW of core loss) + $ 1.50 x (KW of copper loss).

b. Upon receipt, all transformers will be inspected for leaks, breakage, damage and checked for adherence to this standard.

i. Any transformer found not to meet the standards shall be returned to the manufacture for repair, replacement, or to brought into compliance at the manufacturer’s expense.

16. Vendor Information

a. The bidder and or manufacturer shall provide a completed “Exhibit A” for each transformer rating being bid.

In addition, any deviation from this standard shall be clearly identified on “Exhibit B”.

17. Packing and Delivery Instructions

a. All Transformers shall be secured to a hardwood pallet rated to support its weight.

i. Transformers on broken pallets will not be accepted.

b. All transformers must be protected from the weather while in transit.

i. Transformers that are dirty from lack of proper shipping shall be cause for rejection of shipment.

c. Transformers are to be shipped by open flatbed truck or curtain side trailer only to 2345 River Rd, The Dalles Or, 97058.

i. The flatbed/curtain side trailer truck must be loaded in a manner that facilitates unloading the truck with a forklift from the side of the flatbed.

d. NWCPUD warehouse shall be notified a minimum of two working days before delivery day at phone number 541-298-3317.

e. Delivery hours are Monday – Friday excluding major holidays from 8:00 am to 2:30 pm, except for between the hours of 12:00pm till 1:00pm.

18. Warranty

a. The manufacturer warrants the equipment furnished is free from defects in material and workmanship and agrees to repair or replace any unit that is unsuitable for operation or fails in operation during normal and proper use. The warranty shall be for a period of 12 months from date of installation or 18 months from date of delivery, whichever is earlier.

BIDDER'S DATA SHEET * ITEM NO.

NAME_______________________________ KVA ________ HIGH VOLTAGE _______________

LOW VOLTAGE BID OPENING DATE

Bid Evaluated Item Description Values

1. No load losses at 100% rated voltage watts

(Core losses)

2. Load losses at 85°C and full-load current watts

(Copper losses)

3. Impedance %

4. Average temperature rise of the windings above 30°C ambient after one hour at:

Full Load °C One and a Half Load °C

5. Regulation at 80% P.F. %

Regulation at 100% P.F. %

6. Net Weight lbs.

7. Quantity of oil per transformer gallon

8. Gross Weight lbs.

9. Limiting overall dimensions

Height inches Width inches Depth inches

10. Type of tank material and thickness inches

11. Type of finish

*Bidder shall submit with his bid proposal a completed "EXHIBIT A" Sheet 1 for each transformer rating bid

DEVIATION FROM STANDARD

EXCEPTION(S) FROM SPECIFICATION:

a.________________________________________________________________________ b.________________________________________________________________________

I hereby certify that the transformers listed above comply with this standard and comply with the latest applicable industry standards.

Desired delivery schedule (month/year):________________________________

Date delivery will be made: __________________________________________

This quotation is firm for acceptance within_____________ days from_____________________

Signature: _________________________

Print Name: _______________________

Title: _____________________________

Date: _____________________________

Company: _________________________