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

NORTHERN WASCO COUNTY P.U.D.

Material Specification

Single Phase Pad-Mounted Transformers

1. Scope

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

i. The transformers shall be designed for outdoor operation to provide power to residential, 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. Load Side Voltages

a. Low voltage rating shall be 120/240 volts provided by two (2) windings and three low voltage terminals.

i. Except four (4) low voltage terminals on transformers above 100kVA.

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. Transformer Tank & Termination compartment

a. The tank and termination compartment construction shall be the low profile, shrub line design type 2 of

IEEE C57.12.38

b. Transformer tank sizes:

i. Maximum height 36”

1. Measured from top of highest point to bottom of unit.

ii. Maximum width 36”

1. Measured from left to right, when facing the lid, across widest part of unit.

iii. Maximum depth 40”

1. Measured from lid to rear, across deepest part of unit.

iv. Minimum terminal compartment depth 15”

1. Measured from lid to front of bushing well wall.

6. Loop Feed

a. Transformers shall be suitable for loop feed.

7. 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

8. 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.

9. Accessory Equipment.

a. All high voltage accessories shall be place on the feed half side of transformer. All low voltage accessories shall be placed on the load side of the transformer.

10. Taps

a. Transformers rated at 167kVA 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. High Voltage Bushings

a. Transformers shall come equipped with two high voltage bushing wells and corresponding load break inserts for dead end application. The bushing wells shall be externally clamped, 200-amp rated, separable, and rated for primary switching.

i. An example of load-break bushing inserts to be used is Hubbell Power Systems LB 215 Or Elastimold 1601A4.

1. A bleed wire shall be attached to the clamping ring bail and bushing insert per manufacturer’s recommendations.

12. Low Voltage Bushings

a. Bushings shall be bare or tinned copper studs. Neutral bushing shall be insulated, bare or tinned copper stud with external ground strap.

b. The secondary connector shall have connector blocks installed on the transformer.

i. On 50kVA rated transformers and below shall have 5/8”-11 studs capable of handling four (4) position, wire size 10 Str – 350kCMIL connector block.

1. Example would be Ilsco Utilco PTF4-350

ii. On 75kVA rated transformers and up shall have 1”-14 studs capable of handling six (6) position, wire size #6-500kCMIL connector block.

1. Example would be Homac ABW6500

c. Connector blocks shall be mounted and set tight so that the secondary conductor inserts through the set screw hole on the vertical plane or 90 degrees to the horizontal position of the transformer.

13. Fusing

a. A drip shield shall be provided.

b. The transformer shall be protected with a type RTE 358C Bay-O-Net, fault sensing fuses with internal isolation links as follows:

12470Grd Y/ 7200

12470Grd Y/ 7200

KVA

RTE 358 Series dual

RTE

sensing fuse link isolation link

C05

A02

37.5

C08

A03

C08

A03

C10

A05

C10

A05

C12

A06

14. 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.

15. 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.

i. 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 side.

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

16. Nameplate

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

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

17. Access to Terminations & Security

a. Each compartment door shall be tamper resistant in accordance with the latest ANSI standards and hinged with stainless steel (304L) pins that cannot be removed when the compartment doors are closed. The doors shall have a latch or hasp that will allow for locking the doors with a padlock. Minimum one captive and recessed penta-head bolt shall be provided for additional security of the compartment door.

b. The Penta-head bolt shall be considered captive when the retention scheme will prevent it from being readily removed during normal operation of the door.

18. 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).

19. 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 door is 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 for the transformer shall be placed on the outside in a visible manner.

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

20. 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.

21. 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.

22. 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.

23. 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”.

24. 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.

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).

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.

25. 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

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: