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Home My WebLink AboutBID - 5777 LP TRANSFORMERCity of Fort Collins Administrative Services Purchasing Division CITY OF FORT COLLINS INVITATION TO BID BID # 5777 Sealed bids will be received and publicly opened at the office of the Director Of Purchasing and Risk Management, PO Box 580, 215 North Mason St., 2nd floor, Fort Collins, Colorado 80524, at the time and date noted on the bid proposal and/or contract documents. If delivered, they are to be delivered to 215 North Mason Street, 2"d Floor, Fort Collins, Colorado 80524. If mailed, the address is P.O. Box 580, Fort Collins, 80522-0580. Bids must be received at the Purchasing Office prior to 2:00p.m. (our clock), March 25, 2003. Special Instructions All bids must be properly signed by an authorized representative of the company with the legal capacity to bind the company to the agreement. Bids maybe withdrawn up to the date and hour set for closing. Once bids have been accepted by the City and closing has occurred, failure to enter into contract or honor the purchase order will be cause for removal of supplier's name from the City of Fort Collins' bidders list for a period of twelve months from the date of the opening. The City may also pursue any remedies available at law or in equity. Bid prices must be held firm for a period of forty-five (45) days after bid openings. Submission of a bid is deemed as acceptance of all terms, conditions and specifications contained in the City's specifications initially provided to the bidder. Any proposed modification must be accepted in writing by the City prior to award of the bid. Only bids properly received by the Purchasing Office will be accepted. All bids should be clearly identified by the bid number and bid name contained in the bid proposal. No proposal will be accepted from, or any purchase order awarded, to any person, firm or corporation in default on any obligation to the City. Bids must be furnished exclusive of any federal excise tax, wherever applicable. Bidders must be properly licensed and secure necessary permits wherever applicable. Bidders not responding to this bid will be removed from our automated vendor listing for the subject commodities. The City may elect where applicable, to award bids on an individual item/group basis or on a total bid basis, whichever is most beneficial to the City. The City reserves the right to accept or reject any and all bids, and to waive any irregularities or informalities. Sales prohibited/conflict of interest: no officer, employee, or member of City Council, shall have a financial interest in the sale to the City of any real or personal property, equipment, material, supplies or services where such officer or employee exercises directly or indirectly any decision - making authority concerning such sale or any supervisory authority over the services to be rendered. This rule also applies to subcontracts with the City. Soliciting or accepting any gift, gratuity, favor, entertainment, kickback or any items of monetary value from any person who has or is seeking to do business with the City of Fort Collins is prohibited. 09/12/01 215 North Mason Street • 2nd Floor • P.O. Box 580 • Fort Collins, CO 80522-0580 • (970) 221-6775 • FAX (970) 221-6707 Rev. Sym. KK 3.2.4 NEUTRAL TERMINATION 3.2.4.1 On transformers having one high voltage bushing, the H2 end of the winding shall be securely grounded internally. 3.2.4.2 On units having three external eyebolt or spade type low -voltage terminals, the XZ connection of the winding shall be isolated and an adequate external copper ground strap shall be provided from the neutral bushing to a standard tank ground pad. On units having lead type low -voltage terminals, the XZ connections of the winding shall be connected to the tank internally and such connection shall be indicated on a label next to the X2 lead as well as on the nameplate. Ground connections shall be suitably sized for the short-circuit rating of the transformer as defined in ANSI C57.12.00. 3.2.4.3 An adequate stainless steel connection shall provide electrical continuity between the tank and the cover. 3.2.5 ACCESSORY EQUIPMENT In addition to the requirements of ANSI, accessory equipment shall be provided in accordance with Table 1 and the following details. 3.2.5.1 Current -protecting (CP) when specified in Table 1 shall include internal weaklink primary fuse, secondary breaker, signal light, and emergency control handle. Internal fusing (internal) when specified in Table 1 shall include an internal partial range current limiting fuse in conjunction with an internal eutectic (temperature sensitive) weak link fuse. 3.2.5.2 When required by Table 1, an RTE Bay-o-net fuse and internally mounted ELSP partial range current limiting fuse(s) shall be furnished. Bay-o-net fuses shall be top mounted or sidewall mounted as required in Table 1. 3.2.5.3 When the transformer is specified as a dual voltage unit, an externally operated dual voltage switch shall be provided. 3.2.5.4 Taps, when required, shall be full capacity above and below normal and shall be provided with an externally operated tap changer switch. On dual voltage transformers, taps shall be furnished on the top voltage only. 3.2.5.5 Cover mounted, pocket type, cable accessory, parking stand for a loadbreak stand off device shall be provided. 3.2.5.6 Cover mounted instruction nameplate conforming to 5.12 of ANSI C57.12.00-1987, Nameplate A, shall be provided. Also, on the nameplate or label affixed near it, the manufacturer shall indicate that the dielectric fluid contains less than 1 ppm PCB. 6 368-105 Rev. Sym. KK TABLE 1 STOCK NO.368- 105 - SERIAL KVA %Z HIGH VOLTAGE LOW VOLTAGE PROTECTION TYPE RATING TERMINALS) TAPS RATING TYPE AND NUMBER OF TERMINALS ABOVE BELOW -111 10 TBD 13200 GRDY/7620 One bushing well 120/240* Three Eyebolt CP -131 25 1.77 to 2.16 13200 GRDY/7620 One bushing well 1201240* Three CU stud CP -151 50 1.77 to 2.16 13200 GRDYl7620 One bushing well 120/240* Three CU stud CP -155 50 TBD 7620/13200Y Two bushing wells 2-2Y:% 2-2Y=% 120/240* Three 4 hole "H„ S -156 50 TBD 13200 GRDY/7620 One bushing well 2401480 Three Eyebolt CP -161 75 1.86 to 2.27 13200 GRDY/7620 One bushing well 120/240* Three CU stud Internal -171 100 TBD 13200 GRDY/7620 One bushing well 120/240* Three Eyebolt Internal -174 100 TBD 13200 GRDY/7620 One bushing well 2-2'/2% 2-2'/2% 120/240 Four 6 hole "J" Internal -175 100 TBD 7620/13200Y Two bushing wells 2-2'/z% 2-2%% 120-240 Four 6 hole "J" S -176 100 TBD 13200 GRDY/7620 One bushing well 2-2'/.% 2-2%% 277 Two 4 hole "H" Internal -177 100 TBD 7620/13200Y Two cover mounted bushing wells 2-2'/�% 2-2'/,% 2400l4160Y Two cover mounted bushing wells S -184 167 TBD 13200 GRDY/7620 One bushing well 2-2'/2% 2-2%% 120/240 Four 6 hole "J" Internal -185 167 TBD 7620/13200Y Two bushing wells 2-2'/,% 2-2'/,% 120/240 Four 6 hole "J" S -186 167 TBD 13200 GRDY/7620 One bushing well 2-2%,% 2-2'/2% 277 Two 4 hole "H" Internal -189 167 TBD 13200 GRDY/7620 One cover mounted bushing wells 4160GRDY/ 2400 One cover mounted bushing well S -195 250 TBD 7620/13200Y Two bushing wells 2-2'/2% 2-2'/2% 120/240 Four 6 hole "J" S -196 250 TBD 13200 GRDY/7620 One bushing well 2-2'/,% 2-2'/2% 277 Two 6 hole "J" Internal -231 25 TBD 13200 GRDY/7620x 4160 GRDY/2400 One bushing well 120/240* Three Eyebolt CP -238 25 TBD 13200 GRDYl7620x 4160 GRDY/2400 One bushing well 2-2'/2% 2-2'/2% 240/480 Three Eyebolt CP -251 50 TBD 13200 GRDY/7620X 4160 GRDY/2400 One bushing well 120/240* Three Eyebolt CP -258 50 TBD 13200 GRDY/7620X 4160 GRDY/2400 One bushing well 2-2Y:% 2-2%% 2401480 Three Eyebolt CP F<econnectable in field for 120/208 volt service (1) CP = current -protecting (see para. 3.2.5.1); S = conventional; Internal - current limiting protection (see para. 3.2.5.1) TBD = To be Determined 7 368-105 Rev. Sym. KK 3.2.6 TANK 3.2.6.1 An adequate tank coating for underground vault application shall be provided. Appendix B is provided as a reference for comparing coating requirements. The Light and Power Department, Engineering Division, is the only authority regarding the adequacy of proposed coatings. Figure 2 shows outside dimensions. Figure 2 C A C 4i E::: " Maximum Clearance Dimensions inches WA A g C* 75 and below 27 33 44 100 and above 36 36 50 3.2.6.2 PRESSURE The tank shall be equipped with a Qualitrol #202-014-01 or 202-030-01 pressure relief device or a pressure relief cover. If a pressure relief cover is used, the cover assembly shall remain effectively sealed for overloads and external secondary short circuits of the magnitude and duration allowed by industry standards and loading guides, but shall relieve pressure at a minimum of 8 psi gauge if designed to reseal; or at a minimum of 20 psig if designed for pressure relief without resealing. If a pressure relief cover is used, a manual means of venting the tank before removal of the cover shall be provided. Regardless of which means of pressure relief is provided, the tank and other components of the tank shall be of sufficient strength to withstand, without damage or permanent distortion, the pressures occurring prior to pressure relief, as well as pressures occurring due to normal overloads and external secondary short circuits. 3.2.6.3 GROUNDING PROVISIONS A minimum of two tank mounted ground nuts fitted with a solderless type connector for AWG conductor size No. 8 solid to No. 2 stranded shall be provided. One ground connector shall be on the tank sidewall, near the top of the tank, below the primary bushing and the other shall be near the base, below the primary bushing. 8 368-105 Rev. Synn. KK 3.2.7 LOSSES The total losses of a transformer shall be the sum of the excitation losses and the load losses (I2R losses). Load loss tests shall be performed and reported on all units regardless of whether or not a record of such tests is available on duplicate units. Loss evaluations and loss costs will be based on the values shown in the "Special Conditions and Supplemental Instructions to Bidders." Transformers will be evaluated on excitation losses and I2R losses at the specified rates. If tested losses exceed quoted losses but are within the tolerances of paragraph 9.3, ANSI C57.12.00-2000, the additional cost incurred from the differential of losses will be calculated using the following equation and the above specified rates and will be deducted from the original Purchase Order or back charged to the manufacturer. In the following equation "Units" shall mean 'Transformers of the same size and design on one order." Excess loss $ _ [No. of units] [(No Load Loss Evaluation $) (Avg. No Load Losses - Quoted No Load Losses) + (Load Loss Evaluation $) (Avg. Load Losses - Quoted Load Losses)]. If this equation results in a negative number, no credit will be given the Supplier. If any unit or units exceed the tolerances of paragraph 9.3, ANSI C57.12.00-2000, that unit or units shall not be shipped without express permission from the City. If accepted, the deduction for excess losses will be based on the following equation: Excess loss $ _ (No Load Loss Evaluation $) (No Load Losses - Quoted No Load Losses) But Not Less Than Zero + (Load Loss Evaluation $) (Load Losses - Quoted Losses) But Not Less Than Zero. 4 QUALITY ASSURANCE 4.1 GENERAL 4.1.1 RESPONSIBILITY FOR INSPECTION Unless otherwise specified, the vendor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the vendor may utilize his own facilities or any commercial laboratory acceptable to the City of Fort Collins. The City reserves the right to perform or witness any of the inspections set forth in this Specification where such inspections are deemed necessary. 4.1.2 TEST REPORT The manufacturer shall furnish to the purchaser certified copies of the results of loss tests prior to payment. Copies of loss tests shall be sent to Standards and shall be attached to the invoice. Unsigned copies are not acceptable even if accompanied by a signed cover letter. 4.2 TEST CONDITIONS Unless otherwise specified, testing required by Section 4.4 shall be conducted under the following conditions. 4.2.1 REFERENCE TEMPERATURE The reference temperature to which losses, impedance, regulation, and efficiency are corrected shall be 85°C. 4.2.2 TOLERANCE ON IMPEDANCE VOLTAGE Impedance on completed units shall fall within the ranges specified herein. 4.2.3 TOLERANCE ON IMPEDANCE VOLTAGE ON A TAP The percent departure of tested impedance voltage on any tap from tested impedance voltage at rated voltage shall not be greater than the total tap voltage range expressed as a percentage of the rated voltage. 9 368-105 Rev. Sym. KK 4.3 NOT USED 4.4 TESTS The tests to be performed and the test procedures required are specified in ANSI C57.12.20, ANSI C57.12.00, and C57.12.90. Exception: impedance and load -loss tests shall be made on each unit and may not be omitted even if a record of such tests made on a duplicate unit is available. 5 PREPARATION FOR DELIVERY Transformers shall be prefilled with the appropriate amount of transformer oil and shall be shipped by open -bed truck. Units shall be packaged in such a way as to provide for ease of handling and to protect units from shipping damage. Units shall be packaged on four-way universal pallets with 34 inch minimum opening and loaded on the truck for side removal. The Supplier shall provide 24 hour notice prior to delivery for any shipments where an individual transformer weighs over 5,000 pounds. In addition to these requirements, the Supplier shall comply with any additional requirements or modifications shown on the purchase order and/or supplemental instructions. 10 368-105 Rev. Sym. KK APPENDIX A — Transformer Stock Number Coding Below are examples that demonstrate the coding method used by City of Fort Collins to establish transformer stock numbers. I. SINGLE PHASE Example #1: Transformer Class Single Phase 00 = 13.2Y/7620 & 7620/13.2Y x 2400/4160 outside pole 05 = 13.2Y7620 ESNA pole 20 = 13.2Y/7620 ESNA pad II. THREE PHASE Example #2 1[--* 368 - Transformer Class 3 Phase Pad 75 • Other KVA 0 = 5 5=50 1=10 6=75 2=15 7=100 3=25 8=167 4=37.5 9=250 1 = single voltage 2 = dual voltage KVA 006 = 75 075 = 750 015 = 150 100 = 1000 030 = 300 150 = 1500 050 = 500 • All suffixes indicate 208Y/120 sec. • For 480Y/277 sec., add 1 to XYZ (ie. 007 would indicate a 75kVA with 480Y1277 sec.) 11 368-105 Rev. Sym. KK APPENDIX B — Tank Coating Comparison This Appendix is not intended to dictate requirements for items purchased under Specification 368- 105, but is included as an aid in comparing coatings for those manufacturers attempting to meet the requirements of this design. Tank coatings listed here are for reference only and shall not be considered as complete. Also, the City of Fort Collins shall not be held responsible for patent infringements incurred through the use of this information. B.1 ARMORTEC, a fusion bonded vinyl resin having a minimum coating thickness of 15 mils. B.2 Coal -tar Epoxy having a minimum thickness of 15 mils applied in two coats over a zinc rich primer and overcoated with flow coat applied black enamel paint. B.3 Electrostatically applied thermosetting polyester applied as follows: 1. Five Stage Wash - alkaline detergent, water rinse, phosphate treatment, water rinse, and sealing rinse. 2. Delay Line - dry and cool. 3. Coat - Electrostatically coat with a thermoset- ting polyester. 4. Bake - Heat as recommended by polyester manufacturer to set polyester. 5. Cool. 6. Repeat Process - Repeat applicable steps of above process to obtain a minimum dry build of 6 mils. BA Ceilcote Flakeline 252 (minimum thickness 35 mils). 12 368-105 Rev. Sym. KK APPENDIX C — Approved Manufacturers Transformers purchased under this Specification shall be of the make shown below. Manufacturers not listed below may submit written proposals demonstrating compliance with these Specifications for consideration of addition to the accepted manufacturer list prior to the next request for bids. In addition to inclusion on the list below, manufacturer's equipment must also satisfy all requirements of this Specification to be acceptable. MANUFACTURER SERIAL NO. Cooper Power Systems All except 196 & 195 Howard Industries All ABB All Central Moloney All The manufacturers in the following list have been conditionally approved and may bid as an alternate. The definition and intent of "Conditional Approval" of a manufacturer is to allow the City to gain some experience with the manufacturer's product. Should a conditionally approved manufacturer be the evaluated low bidder, the City reserves the right to award all, part, or none of the order to them, dependant upon the current needs of the City for that item or items. 13 368-105 Transformer Loss Evaluation Form- AVERAGE LOSSES City Order No. S/N Manufacturer Invoice No. KVA/Unit LINE DESCRIPTION AMOUNT (1) No. of units (2) Average core losses (3) Quoted core losses (4) Excess average core losses: line (2) less line (3) (5) Penalty for excess average core losses: line (1) x line (4) x $ 6) Average copper losses (7) Quoted copper losses (8) Excess average copper losses: line (6) less line (7) (9) Penalty for excess average copper losses: line (1) x line (8) x $ (10) Penalty to be assessed manufacturer: line (5) plus line (9) but not less than zero Date Prepared By: Design Engineering Rev. Sym. KK NOTE: If any unit(s) exceeds the loss tolerances of ANSI C57.12.00, Light & Power will either reject it, include it on these averages, or calculate losses using the Individual Transformer Losses Evaluation Form, whichever is most favorable to Light and Power. 14 368-105 Individual Transformer Loss Evaluation Form City Order No. S/N Manufacturer Invoice No. KVA/U n it LINE DESCRIPTION AMOUNT (1) Tested core losses (2) Quoted core losses (3) Excess core losses line (1) less line (2) but not less than zero (4) Percent difference line (3) , line (2) x 100 (5) Tested total losses (6) Quoted total losses (7) Excess total losses line (5) less line (6) but not less than zero (8) Percent difference line (7) , line (6) x 100 (9) Tested copper losses (10) Quoted copper losses (11) Excess copper losses line (9) less line (10) but not less than zero (12) Penalty for excess core losses line (3) x $ (13) Penalty for excess copper losses line (11) x $ (14) Penalty to be assessed manufacturer line (12) plus line (13) Date Prepared By: _ (Design Engineering) Rev. Sym. KK 15 368-105 Freight terms: unless otherwise noted, all freight is F.O.B. Destination, Freight Prepaid. All freight charges must be included in prices submitted on proposal. Discounts: any discounts allowed for prompt payment, etc., must be reflected in bid figures and not entered as separate pricing on the proposal form. Purchasing restrictions: your authorized signature of this bid assures your firm's compliance with the City's purchasing restrictions. A copy of the resolutions are available for review in the Purchasing Office or the City Clerk's Office. Request Resolution 91-121 for cement restrictions. Collusive or sham bids: any bid deemed to be collusive or a sham bid will be rejected and reported to authorities as such. Your authorized signature of this bid assures that such bid is genuine and is not a collusive or sham bid. Bid results: for information regarding results for individual bids send a self-addressed, self -stamped envelope and a bid tally will be mailed to you. Bid results will be posted in our office 7 days after the bid opening. J me B. O'Neill II, CPPO, FNIGP Di or of Purchasing and Risk Management 09/12/01 Rev. Sym. KK Special Conditions andSupplemental Instructions to Bidders Applicable to Specification 368-105 A. Data to be Supplied with Bidder's Proposal The following data shall be supplied with the bidder's proposal in addition to that information required by the "Invitation to Bid" and the "Purchase Requisition". 1. Impedance volts in % at full load, high voltage to low voltage at 85°C. 2. No load and total losses at 85°C. 3. Protective tank coating specification. 4. A statement indicating compliance with our Specification without exception. 5. Escalation is _, is not applicable for the transformers bid. If escalation applies, the Bidder shall indicate in his bid the specific items or materials subject to escalation, and shall give the method and indices to be used in computing the amount thereof. Escalation occurring after the quoted delivery date will not be paid unless delays are the result of actions by the City. Escalation occurring after acceptance, if Purchaser exercises the option to delay shipment after manufacturing is completed, will not be paid. Failure to supply the above data shall constitute a basis for rejection of the bid. B. Loss Evaluations Loss penalties and loss evaluations will be based on the following values: 1. No load or excitation losses at $3.25/watt. 2. Load losses at $1.10/watt. C. Shipping Terms Ship F.O.B. point of destination, freight prepaid. D. Terms of Pavment 1. If escalation applies, the City of Fort Collins shall not be billed for escalation occurring after the promised delivery date. Escalation charges shall be itemized on the invoice. 2. Test reports shall accompany the invoice. If test reports do not accompany the invoice, late payment penalty charges incurred due to delays in obtaining the test reports will not be paid. Certified copies of test reports shall be sent to the Design Section, Fort Collins Light and Power Utility. 3. Loss penalty credits and escalation charges shall be itemized on the invoice. 16 368-105 CITY OF FORT COLLINS BID PROPOSAL BID NO. 5777 BID OPENING: March 25, 2003 2PM (our clock) WE HEREBY ENTER OUR BID FOR THE CITY OF FORT COLLINS' REQUIREMENTS FOR TRANSFORMER, 50 KVA PER THE BID INVITATION AND ANY REFERENCED SPECIFICATIONS. QUANTITY: DESCRIPTION: 150Ea. Transformer, 50 kVA, modified overhead, single phase distribution with one high -voltage bushing well, high voltage rating: 13200 GRDY/7620. Low voltage rating: 120/240. Serial number 151 to be in accordance with Specification #368-105-151, Revision KK. $ Ea. $ Total Mfr. Mfr. # Delivery in Weeks Guaranteed No Load Loss Guaranteed Full Load Loss Guaranteed Total Load Loss Impedance (%) Escalation is , is not applicable for the transformers bid. If escalation applies, the Bidder shall indicate in his bid the specific items or materials subject to escalation, and shall give the method and indices to be used in computing the amount thereof. Escalation occurring after the quoted delivery date will not be paid unless delays are the result of actions by the City. Escalation occurring after acceptance, if Purchaser exercises the option to delay shipment after manufacturing is completed, will not be paid. Transformers being bid meet the attached specifications. Yes_ No _. If no, please list exceptions (specifying paragraph reference number) on a separate sheet and attach to your bid. For purposes of warranty and service ONLY approved manufacturers or distributors authorized by an approved manufacturer to serve the Fort Collins area may bid. The City of Fort Collins reserves the right to split the bid in whatever percentages are most advantageous to the City. At the option of the City of Fort Collins future orders of 50kVATransformers may be purchased from this bid for a period of five years after the date of the award. 09/12/01 SUPPLEMENTAL INSTRUCTIONS Prices quoted must remain firm for a 30 day period after the opening date. Freight terms: F.O.B. destination freight prepaid. All freight charges must be included in pricing submitted on proposal and not entered as separate pricing. Any discount allowed by Vendor for prompt payment, etc. must be reflected in quoted figure, and not entered as separate pricing. The City reserves the right to accept or reject any and all quotes. Bidder not responding to the services requested in this bid shall be removed from our automated listing for: Not applicable Any questions or inquiries regarding this bid should be directed to: OPAL F. DICK, CPPO, SENIOR BUYER (970) 221-6778 SIGNATURE AND TITLE TYPED OR PRINTED NAME AND TITLE COMPANY NAME (AREA CODE) TELEPHONE NUMBER/FAX NUMBER ADDRESS: STREET, CITY, STATE, ZIP DATE 09/12/01 THE CITY OF FORT COLLINS Light and Power Department P.O. Box 580 Fort Collins, CO 80522 SPECIFICATION NO: 368-105 TITLE: OVERHEAD -TYPE, SINGLE PHASE DISTRIBUTION TRANSFORMERS WITH SEPARABLE INSULATED LOAD BREAK HIGH -VOLTAGE CONNECTORS PREPARED BY: el� e- Tim M. Sagen, Sf6ndards Engineering Manager ORIGINATED: March 3, 1973 REVISED: February, 2003 Rev. Sym. KK REVISION DESCRIPTIONS REVISION DESCRIPTION (Previous revisions on file) APPROVED Rev. 11 • Updated Table of Contents Sagen/Coram • Paragraph 3.2.2.1.1; 3.2.4.2. - Editorial 7/27/94 • Paragraph 3.2.3.1. - updated ANSI reference • Paragraph 3.2.3.2. - changed lead type terminals to stud type, updated ANSI reference to 1985. • Paragraph 3.2.5.2 - Deleted reference to Table II • Paragraph 3.2.5.6. - Updated ANSI reference; changed "non -PCB" reference to "contains < 1 ppm PCB • Paragraph 3.2.6.1. - Change Table III to Figure 2 • Paragraph 3.2.7. - Delete ratio requirement, update ANSI reference to 1987. • Paragraph 4.2.2. - Change impedance tolerance to within range specified. • Table 1: Change lead type LV terminals to stud type. Add impedance ranges on 131, 151, and 156. • Add Figure 1 • Changes Table III to Figure 2 • Appendix C — delete tank coating from table. Rev. JJ Sagen 9/4/97 • Paragraph 5.0 — Added pallet requirements Rev. KK Sagen 2/20/2003 • Update date specific references to ANSI standards. • Add reference to Central Moloney secondary bushings. • Add Central Moloney to Approved Manufacturers list in Appendix C. 2 368-105 Rev. Sym. KK TABLE OF CONTENTS REVISIONDESCRIPTIONS...................................................................................................................................................2 1 SCOPE.................................................................................................................................................................................4 2 APPLICABLE DOCUMENTS..............................................................................................................................................4 3 REQUIREMENTS.................................................................................................................................................................4 3.1 GENERAL REQUIREMENTS FOR DESIGN.............................................................................................................................4 3.2 SPECIFIC REQUIREMENTS FOR DESIGN..............................................................................................................................4 3.2.1 FUNCTIONAL DESCRIPTION............................................................................................................................................. 4 3.2.2 RATINGS................................................................................................................................................................................ 4 3.2.3 BUSHINGS AND TERMINALS............................................................................................................................................. 5 3.2.4 NEUTRAL TERMINATION................................................................................................................................................... 6 3.2.5 A CCESSOR Y EQ UIPMENT .................................................................................................................................................. 6 3.2.6 TANK...................................................................................................................................................................................... 8 3.2.7 LOSSES.................................................................................................................................................................................. 9 4 QUALITY ASSURANCE......................................................................................................................................................9 4.1 GENERAL....................................................................................................................................................................................9 4.1.1 RESPONSIBILITY FOR INSPECTION................................................................................................................................. 9 4.1.2 TEST REPORT....................................................................................................................................................................... 9 4.2 TEST CONDITIONS....................................................................................................................................................................9 4.2.1 REFERENCE TEMPERATURE............................................................................................................................................. 9 4.2.2 TOLERANCE ONIMPEDANCE VOLTAGE.........................................................................................................................9 4.2.3 TOLERANCE ON IMPEDANCE VOLTAGE ON TAP.......................................................................................................9 4.3 NOT USED.................................................................................................................................................................................10 4.4 TESTS.........................................................................................................................................................................................10 5 PREPARATION FOR DELIVERY......................................................................................................................................10 APPENDIX A - TRANSFORMER STOCK NUMBER CODING..........................................................................................11 APPENDIX B - TANK COATING COMPARISON...............................................................................................................12 APPENDIX C - APPROVED MANUFACTURERS..............................................................................................................13 TRANSFORMER LOSS EVALUATION FORM- AVERAGE LOSSES................................................................................14 INDIVIDUAL TRANSFORMER LOSS EVALUATION FORM..............................................................................................15 SPECIAL CONDITIONS ANDSUPPLEMENTAL INSTRUCTIONS TO BIDDERS .............................................................16 3 368-105 Rev. Sym. KK SPECIFICATION FOR OVERHEAD -TYPE, SINGLE PHASE DISTRIBUTION TRANSFORMERS WITH SEPARABLE INSULATED LOAD BREAK HIGH -VOLTAGE CONNECTORS 1 SCOPE This Specification establishes the minimum requirements for single phase, 60 hertz, mineral -oil -filled self cooled (O.I.S.C.) overhead -type distribution transformers with separable insulated load break high voltage connectors; rated 250 kilovolt -amperes (KVA) and smaller; high -voltage: 7620/13200Y and dual voltage 7620/13200Y x 2400/4160Y; low voltage 120/240, 240/480, 277 volts, and 4160Y/2400. 2 APPLICABLE DOCUMENTS The following American National Standards (ANSI) for Distribution, Power, and Regulating Transformers and Shunt Reactors form a part of this Specification: • General Requirements • Overhead -Type Distribution Transformers • Terminal Marking and Connections • Terminology • Test Code • Appendix to ANSI C57.12.20 • Separable Insulated Connectors 3 REQUIREMENTS 3.1 GENERAL REQUIREMENTS FOR DESIGN C57.12.00 C57.12.20 C57.12.70 C57.12.80 C57.12.90 C57.91 ANSI/IEEE 386 Unless otherwise stated in this Specification, all transformers shall be new and shall conform to the American National Standard Requirements for Overhead -Type Distribution Transformers, ANSI C57.12.20 - latest revision. In case of conflict, the requirements of the following documents shall apply in the priority shown: 1. This Specification. 2. Referenced ANSI Standards. Approved manufacturers are listed in Appendix C. For purposes of warranty and service, any distributor bidding must be an authorized distributor appointed by an approved manufacturer to serve the Fort Collins area. 3.2 SPECIFIC REQUIREMENTS FOR DESIGN 3.2.1 FUNCTIONAL DESCRIPTION Transformers of this design are for installation on an underground power system utilizing separable insulated connectors and may be installed in underground vaults subject to submersion. They may also be padmounted under an enclosure, or pole mounted. The transformer tank, cover, and all external appurtenances shall be of corrosion -resistant material, unless they are otherwise rendered corrosion resistant. 3.2.2 RATINGS 3.2.2.1 KILOVOLT -AMPERE -RATINGS 3.2.2.1.1 NAMEPLATE RATING Kilovolt -ampere ratings are continuous and based on not exceeding either a 65°C average winding temperature rise or an 80°C hot spot temperature rise. The temperature rise of the insulating oil shall not exceed 65' when measured near the top of the tank. The KVA rating shall be regarded as a test rating which defines an output which can be taken from the apparatus under the prescribed conditions of test within the limitations of all applicable standards. KVA ratings shall be in accordance with Table- t. 4 368-105 Rev. Sym. KK 3.2.2.1.2 ADDITIONAL SUPPLEMENTAL LOADING Additional supplemental loading may be carried as recommended by ANSI C57.91. 3.2.2.2 VOLTAGE RATINGS Secondary and primary voltage ratings shall be in accordance with Table 1. 3.2.2.3 IMPEDANCE Nominal impedance voltage shall be in accordance with Table 1 of this specification. Completed units may vary from the specified nominal up to the tolerance specified in ANSI C57.12.00. 3.2.2.4 BASIC IMPULSE INSULATION LEVELS The high voltage BIL shall be 95 kV. The low voltage BIL shall be 30 kV. 3.2.3 BUSHINGS AND TERMINALS All internal leads and connections, on both high and low voltage, shall be sized to carry full ampere rating, including overload rating of transformer. 3.2.3.1 HIGH VOLTAGE TERMINALS The number of high voltage terminals required is specified in Table 1. High -voltage bushing wells shall be cover mounted 200A load -break interface 8.3/14.4 kV bushings in accordance with ANSI/IEEE Std. 386. 3.2.3.2 LOW VOLTAGE TERMINALS Terminal type and number shall be in accordance with Table 1 of this specification. Eyebolt and spade terminals shall be singly mounted sidewall type. Stud type terminals shall be singly mounted on the sidewall at 5.5 to 7.5 inch center to center spacing. Stud type terminals shall be equivalent to Central Moloney type 7013 having dimensions in accordance with Figure 1 of this specification or Central Moloney type 70105850, shall have a copper stud, and shall be internally or externally clamped. All non-metallic components of the terminals shall be of a material resistant to ultra -violet degradation. Mounting hardware shall be corrosion resistant. Secondary terminals for transformers with secondary voltages above 480V shall be cover mounted 200A load -break interface 8.3/14.4 kV bushings in accordance with ANSI/IEEE Std 386. See below Figure 1 k - *_// 1.38" dia. WA Rating Thread Size Min. Len th 25 - 75 0.625" — 11 UNC-2A 1.25" 100 - 167 1.0" — 14 UNC-2A 1.75" 5 368-105