Exhibit E - Three Phase Pad-Mount Transformer Specs.pdf

NORTHERN WASCO COUNTY P.U.D.

Material Specification

Three Phase Pad-Mounted Transformers

1. Scope

a. This section covers pad mounted, three-phase, 60Hz alternating current, oil immersed, self-cooling, compartmental type distribution transformers with separable bushing wells and insulated high voltage load break bushing inserts suitable for operation on Northern Wasco County PUD’s 12,470 Grounded Y/7200 distribution system.

i. The Transformers shall be designed for outdoor operation and installation on a concrete pad to provide power to commercial, industrial, agricultural, and institutional loads.

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. Low Voltage ratings shall be:

a. 208Y/120 or 480Y/277

4. BIL Rating

a. All transformers supplied under this stand shall have:

i. BIL rating on the high side 95kV.

ii. BIL rating on the low side 30kV.

5. Loop Feed

a. The transformers supplied shall have six (6) high voltage bushings wells for loop primary cable feed.

6. 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 IDF Corporation.

7. Taps

a. Transformers 500kVA and greater, will be supplied with four (4) taps, two 2 ½% taps above and two 2 ½% taps below normal.

i. Tap changer handle may be mounted in either the high or low voltage compartment and be operable from outside the transformer tank.

8. High Voltage Bushings

a. The transformer shall have six (6) high voltage bushing wells.

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

b. Transformers shall come equipped with corresponding load break inserts for dead front application. The bushing wells shall be externally clamped, 200-amp rated, separable, and rated from primary switching per IEEE 386.

c. Load-break bushing inserts shall be provided.

i. Example would be Elastimold catalog number 1601A4

ii. A bleed wire shall be attached to the clamping ring bail and bushing insert.

d. The insert shall be shipped with physically wired and secured dust caps.

e. Parking stands shall be provided.

9. Low Voltage Bushings

a. Shall be in accordance with IEEE C57.12.34, figure 8a.

b. Neutral bushings shall be insulated, bare or tinned coper stud with external ground strap.

c. The connector shall have spades installed on the transformer.

i. The terminal spade shall be similar to IEEE C57.12.34 figure 19.

ii. Transformer under 750kVA shall have six (6) holes.

iii. Transformer 750kVA and above shall have ten (10) holes.

1. Transformers with 10-hole spades shall have bushing/spade supports bracket that will not interfere with NEMA sized pad holes.

d. Spades shall be mounted and set tight so that the spade holes are on the vertical plane or 90 degrees to the horizontal position of the transformer.

10. High Voltage Switch

a. Each supplied transformer shall have a switch rated at the correct voltages and amperage to connect to either one or the other or both high voltage sources.

b. The switch shall also be capable of de-energizing the secondaries.

c. The switch shall be able to be operated via hotsick/shotgun allowing NWCPUD personnel to switch between the positions without de-energizing the transformer.

i. The switch shall have stenciled directly adjacent and clearly visible stating the current position of the switch.

11. Fusing

a. A drip shield shall be provided.

b. Bay-O-Net type fusing shall be provided to transformers up to 1000kVA, one for each phase. These overcurrent devices shall be capable of interrupting no less than 3500 amps asymmetrical fault current up to 8. kV phase to ground.

c. An isolation link shall be used in series with the Bay-O-Net oil fuse cutouts.

d. The transformer shall be provided a dual sensing link (RTE 358C) with the appropriate isolation link.

e. The Bay-O-Net fuse shall be unobstructed and readily removable from the fuse holder using a standard hot stick.

f. Type RTE 358C (dual sensing link) for protection of the transformer against excessive overload, secondary faults and for protection of the system against transformer fault. The correct isolation link for a specific RTE Bay-O-Net dual sensing fuse link is to be provided as follows:

1. Transformers larger than 1000kVA shall be protected as shown below or by the manufacture’s standard procedure if not listed in the table.

12470GrdY/7200

12470GrdY/7200

KVA

RTE 358C Series dual sensing fuse link

RTE isolation link

C05

A02

112.5

C08

A03

C08

A03

Three Phase Pad-Mounted Transformers

225 C10 A05

300 C10 A05

500 C12 A06

750 C14 A07

1000 C14 A07

12. Core-Coil Assembly

a. The transformer core and coil assembly shall be either five legged or triplex construction.

b. The windings shall be copper.

13. 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, 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 would be 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 used in the dielectric fluid; Or when any changes in process, chemicals used or medical hazards change.

14. Oil Fill, Drain & Test

a. A minimum one-half inch (1/2”) NPT plug for filling and pressure testing the transformer shall be provided in the termination compartment.

i. Galvanized hardware will not be acceptable.

b. A minimum one-half inch (1/2”) NPT drain plug shall be provided in the transformer termination compartment it shall be gate or ball activated.

i. Transformers 500kVA and above in size shall have a built-in sampling device.

ii. Galvanized hardware will not be acceptable.

c. Drain and fill plugs shall be a threaded plug, not a cap.

d. A suitable means for indicating correct liquid level at 25C shall be provided in the secondary termination cabinet.

e. The required oil fill level shall never be higher than the bottom of the oil fill plug

15. Nameplate

a. Shall be in accordance with IEEE C57.12.00 paragraph 5.12.2.

b. The nameplate shall be mounted inside the termination cabinet at the top on the secondary side in a conspicuous area.

16. Access to terminations & Security

a. Cabinet access doors shall comply with the security provisions of IEEE C57.12.28.

i. Door hinges and hinge pins shall be manufactured using a minimum 304L stainless steel that can not be removed when the compartment is closed.

ii. Cabinet access doors shall have a stop for latching in the open position.

iii. Cabinet access doors are to be arranged so that access to the high voltage compartment can be gained after a Penta captive bolt is removed and only after opening the low voltage compartment door.

iv. Cabinet access door edges shall have a close-fitting mating surface to prevent unauthorized entry.

v. The doors shall have a latch or hasp that will allow for locking the doors with a padlock only after the Penta bolt has been fully engaged.

17. 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 bell green (ANSI #7.0GY3.29/1.5).

18. Labels

a. A danger high voltage label, complying with ANSI Z535, shall be located on the inside of the transformer and readily visible whenever the equipment doors are opened.

b. All components inside the transformer on both the primary side and secondary side shall be labeled appropriately.

i. This shall include but not be limited to the following:

1. Both high and low voltage bushing labels and markings.

2. If the fill plug is used for oil level indication, the manufacture shall label the plug with either an oil level line or arrow as the oil level indicator on the tank face.

3. Bay-O-Net fuse labels verifying the brand of fuse holders and catalog number of current sensing fuse.

c. A sticker of the kVA rating of the transformer and low side voltage shall be on the outside in a visible manner on the front doors.

i. No other manufacturing labeling will be provided on the outside of the transformer in public view, but what is noted in section “c.”

19. 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, or stamp, 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.

20. 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.

21. 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.

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.

22. 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”.

23. 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.

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).

Three Phase Pad-Mounted Transformers

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.

24. 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.

DOCUMENT REVISIONS

REVISED BY TITLE DATE COMMENTS REVISION #

Jeff Handley Utility Worker Creation

Jeff Handley Engineering Tech II 04/08/2024 Add 12 b. 1.1

EXHIBIT "A"

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.

EXHIBIT "B"

DEVIATION FROM STANDARD EXCEPTION(S)

FROM SPECIFICATIONS:

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: