6490 - Supply of Station Service Voltage Transformers, 3.Statement of Work/ Specifications
Materials Management Department
901-B Texas Street
Denton, Texas 76209
RFP 6490 EXHIBIT 3
SCOPE OF WORK
The City of Denton is seeking the best value solution for the:
SUPPLY OF STATION SERVICE VOLTAGE TRANSFORMERS
NIGP CLASS and ITEM
285
84
Issue Date: July 14, 2017
Response due Date and Time (Central Time):
Tuesday, August 1st, 2017, 11:00 A.M. C.D.T
SUPPLY OF STATION SERVICE VOLTAGE TRANSFORMERS
Purpose
The purpose of this specification is to provide the information necessary to allow prospective suppliers to prepare an RFP to furnish completely assembled and tested station service
voltage transformers for use on 69kV and 138kV transmission systems. The transformers are to be priced F.O.B. to the Spencer Utility Site, 1701C Spencer Road, in Denton, Texas or to
other substation sites in or near Denton as directed at the time of shipment
Technical questions, drawings, and transmittals shall be directed to:
Mr. Chuck Sears OR Ms. Laura Cheek
Denton Municipal Electric Denton Municipal Electric
1671 Spencer Road 1671 Spencer Road
Denton, TX 76205 Denton, TX 76205
Phone: (940) 349-7111 Phone: (940) 349-7126
Service Conditions
Site Location: The service location for these transformers will be in substations in the Denton, Texas area.
Service Elevation: Approximately 640 feet above sea level.
Temperature: -20o F to 120o F.
Fault Current Available at the High Voltage Terminals: 20,000 amps symmetrical (maximum available at the high voltage bushings).
Other Considerations: Moderately humid climate with 10 to 30 inches of rain per year; wind up to 90 mph; thunderstorms with severe lightning occurring in all months of the year with
the greatest frequency during the warmer months.
Terms and Conditions
Detail Design: Detailed structural and electrical design is the responsibility of the supplier. All clearances and spacing must conform to ANSI standards, and the National Electrical
Safety Code, whichever is more stringent. Greater clearances shall apply where specified.
Approval of Design: The owner shall have an opportunity to approve the design and features of the station service voltage transformers prior to manufacture. Approval drawings shall
contain sufficient information to confirm all data that was included in the bid proposal and fully describe each unit. It is the intent of this specification to require only standard
units normally constructed by the manufacturer and identified by standard catalog numbers. As such the information included with the proposal if sufficient, may be considered as approval
drawings if the successful bidder wishes. After the approval submittal is accepted, the manufacturer shall not make any design
changes that affect mounting dimensions or electrical performance of any station service voltage transformers unless approved in writing by the owner.
Review of drawings by the owner will be with respect to general design and functionality, but shall not be construed to relieve the supplier from any responsibility or liability for
proper design, fabrication, compliance with the specifications, compliance with standards, or for any errors that may have been contained in the shop drawings.
The approval submittal shall provide information in sufficient detail to describe equipment function including at least nameplate data; dimensions; space needs for installation; mounting
means; weights; shipping dimensions and weights; the locations of interconnection points for attachment of the customer’s wiring; etc. sufficient to allow verification of all ratings
and specifications. This information will be used to complete the design of station components.
Final Drawings, Instruction Books, and test Reports: No later than the scheduled first shipment, the supplier shall furnish two sets of instruction books and final drawings for each
type of station service voltage transformer being purchased. Final drawings shall be provided in “pdf” and AUTOCAD “dwg” format. Two hard copies and one electronic copy of the certified
test report will be furnished for each device manufactured. One copy of drawings, instruction books, and test reports shall be shipped with each station service voltage transformer
to be retained at the service site.
Guarantee: The supplier shall guarantee that station service voltage transformers furnished shall be free from all defects in design, materials, workmanship, and shall give successful
service under the specified operating conditions. The supplier shall also agree upon notice from the owner to promptly and without charge, and to the satisfaction of the owner make
such changes, repairs, replacements, corrections, etc. which may be required to make good all defects in design, materials, function, or performance developing in the material or equipment
under its intended use with proper care for a minimum period of 12 months from the date first energized in a substation. With the exception of units accepted for early shipment, station
service voltage transformers will be first energized no later than six months after delivery.
For any units accepted for early shipment, the manufacturer shall extend the warranty period such that the warranty as specified in the paragraph above shall begin on the date the transformer
is first energized in its permanent location.
Materials and Workmanship: Only new materials shall be used in fabrication of these station service voltage transformers. Damaged or defective materials shall not be repaired and used.
No peening, caulking, or filling shall be permitted in repairing cracks, pinholes, or other types of defects. Such defects in fabricated members shall be repaired by replacement.
Design Standards
All station service voltage transformers shall be manufactured to meet or exceed the requirements in the latest revision of all USA standards that are applicable to station service voltage
transformer construction. Applicable standards shall include at least those