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HomeMy WebLinkAboutAgenda Report - April 2, 1997 (76)CITY OF LODI COUNCIL COMMUNICATION AGENDA TITLE: Specifications and Advertisement for Bids for Padmount Transformers MEETING DATE: April 2, 1997 SUBMITTED BY: Electric Utility Director RECOMMENDED ACTION: That the City Council approve the specifications and authorize advertisement for bids for four 1500KVA, one 750KVA, and two 500KVA three-phase padmount transformers. It is further requested that the City Council authorize the Electric Utility Director to award the purchase of the four 1500KVA units under certain conditions detailed below. BACKGROUND INFORMATION: At a March 19, 1997 meeting with Arkay Plastics it was learned that this new industrial customer plans to be operational by August 1, 1997. It was further determined that the new electrical load will require three 1500KVA padmount transformers, with a fourth 1500KVA unit likely to be required later in the fall. The electrical loading at the Arkay facility, as presented in the March 19 meeting, is increased fourfold over loading indicated at earlier meetings. This increased requirement, combined with the fast-track development of this facility and the expected long lead time for production of the 1500KVA units, requires that the bidding, evaluation, and award process be condensed to assure timely delivery. It is staffs recommendation, therefore, that in the event the delivery leadtime exceeds the 10 -week period between the May 7 meeting of the City Council (the earliest opportunity for Council award) and the required delivery date of mid-July, the Electric Utility Director be authorized to award the purchase. Such purchase would be based on standard award criteria, that is, to the bidder whose proposal and equipment meet City of Lodi specifications, and whose transformers are expected to yield the lowest overall life -cycle costs. Notice of such award would be reported to the City Council on May 7. If estimated delivery time is less than ten weeks, staff would present its award recommendations for the 1500KVA transformers, along with the 500- and 750-KVA units, at the May 7 Council meeting. The 500- and 750-KVA transformers will be used for the Hotel Lodi project, and to upgrade facilities in the downtown area. BID OPENING: April 16, 1997 FUNDING: Estimated total costs: 1500KVA units - $62,000; 500KVA and 750KVA units - $25,000 Funding is av ' withi to EI ctrl Utility Department's Operating Budget Alan N. Vallow, Electric Utility Director Prepared by Joel Harris, Purchasing Otlicer APPROVED: i7 H. DIXON FLY N City Manager SPECIFICATIONS PADMOUNTED TRANSFORMERS DIVISION 1 - GENERAL REQUIREMENTS 1-1 GENERAL Electrical design and materials shall conform to the latest EEI-NEMA and ANSI Standards for Oil -Filled Equipment. It is the intent of these specifications to describe equipment of the best design and construction, for the service for which it is intended. Consequently, it shall be the City's desire to award contracts to the bidder who has demonstrated high quality by having a considerable number of transformers of his manufacture in service on the lines of electrical utilities over a period of years. 1-2 TESTS Transformers shall receive at least the following tests in accordance with the applicable ANSI and NEMA Standards: (1) Load and no-load loss (5) Applied and induced potential test (2) Exciting current (6) Impulse voltage test (3) Polarity Check (7) Tank pressure test (4) 1-3 SERVICE Ratio check The manufacturer shall own and operate a service shop in this vicinity, or the bidder may submit evidence of a repair contract with an approved service shop in this vicinity, which has been in effect for a period of at least one year. (For the purpose of this specification, "vicinity" shall mean within a 200 -mile radius of the City of Lodi). 1-4 GUARANTEE The Manufacturer shall guarantee all equipment delivered under these specifications against any and all defects in material and/or workmanship for a period of at least one year from date of acceptance. Manufacturer shall rectify all such defects by repair or replacement at manufacturer's sole expense and shall assume responsibility for associated shipping costs. PADMOUNTED TRANSFORMERS DIVISION 1 - GENERAL REQUIREMENTS (continued) 1-5 TECHNICAL INFORMATION The following specifications shall be met: 1. Insulation level: 95 kv BIL (min). 2. Insulation rating: 65 C rise. 3. Ground Lugs: Two (2) ground lugs which accept a range of #4 to 1/0 AWG copper shall be provided. 4. Paint: All exterior surfaces shall be painted Munsell 7GY3.29/1.5 (olive) green (or approved equal), using a system of coordinated and thoroughly tested materials and application techniques that will assure long life. Special attention shall be given to welds, seams, edges and rough spots. 5. Lifting Lugs: Lifting lugs shall be provided on the tank and shall be located in such a way to avoid interference between lifting slings and any attachments on the transformer and to avoid scratching the transformer coating. 6. Tanks: Tanks shall be tested at a pressure equal to or greater than the maximum operating pressure and for a sufficient period of time to insure that all welds are free from leaks. Tank and radiator construction shall be consistent with good manufacturing and design practices prevalent in the transformer industry, and together they should contribute to a high quality product. 7. Nameplates: Stainless steel or anodized aluminum nameplate shall be securely attached to the transformer by means of metal screws, rivets or similar mechan- ical device(s). The letters and numbers shall be stamped or engraved on the nameplate. The nameplate shall include the words, "Fluid is less than one p.p.m. PCB, " refer to Section 1-7. The instruction nameplate shall contain the informa- tion specified in Section 5.12 of ANSI Standard C57.12.00-1980. 8. Sound level: The sound level shall be equal to or better than EEI-NEMA Standards. 2 PADMOUNTED TRANSFORMERS Division 1 - General Requirements (continued) 1-6 LOSSES Losses will be considered in the evaluation of this bid as follows: No-load (core) loss @ $6.00/watt Load (winding) loss @ $2.00/watt The cost of losses will be added to the equipment price (bid price) F.O.B. Lodi, including maximum escalation and tax, to determine the evaluated low bid of vendor otherwise meeting these specifications. All bidders shall supply the following guaranteed loss data for use in the evaluation, in addition to other data listed in the specifications: 1. No-load losses in watts at rated secondary voltage. 2. Load losses in watts at rated secondary voltage and rated load. The standard reference temperature for load loss shall be 85 C. 3. Upon request, furnish certification/statement of the guaranteed loss measurement error of the test equipment and measurement method to be used, including the basis for determination of the accuracy of the test equipment and measurement method. The successful bidder shall supply a certified test report of actual losses of the unit(s) to be supplied. The no-load and load losses for each group (type and size) of transformer(s) will be averaged separately within their respective categories .(no-load and load losses). If the averaged tested no-load (core) and/or load(winding) losses of the transformer group exceed the watt losses quoted .in the proposal, the contract price shall be reduced by the above amounts per watt of actual group averaged no-load and/or actual load loss in excess of that quoted in the proposal. No-load loss penalties will be evaluated separately from load loss penalties. No additional payment will be made to the manufacturer or bidder for actual losses lower than the losses quoted in the proposal. Certified test report of losses shall be submitted by the manufacturer prior to or at the time of shipment of the transformer. 1-7 PCB CONTENT Transformer fluid shall be guaranteed to contain less than one p.p.m. by weight (mg/kg) polychlorinated biphenyls (PCB). Certified test report of PCB content shall be produced upon request. The transformer nameplate shall include the words, "Fluid is less than one P.P.M. PCB." 1-8 DIMENSIONS The overall dimensions of the units (height, width, depth - height only for single-phase units) will be considered in the evaluation of this bid. 1-9 LABELING The units are to be shipped without the Safety Labels per NEMA No. 260-1982. The City will affix its personalized "Mr. Ouch" labels. PADMOUNTED TRANSFORMERS Division 1 - General Reg uirements(contin u ed) 1-10 PADMOUNTED EQUIPMENT ENCLOSURES A. General: 1. Atypical padmounted equipment enclosure consists of a surrounding case or housing for equipment to prevent unauthorized access to protect people against accidental contact of energized parts and protect equipment against weather hazards. The enclosure is mounted on a pad, above ground level, and may be ventilated to permit circulation of air. Entry into the enclosure shall be through either access door(s) or hood(s) as specified. B. Structural Strength and Integrity Test: The structural strength and integrity test shall comply with the latest NEMA and ANSI Standards for testing, design and enclosure security. C. Construction: The construction shall be such that: a. It prevents the entry of foreign objects, such as sticks, rods or wires. b. It inhibits dismantling of the equipment. C. It is free of areas which could provide access by forcing techniques. d. Panels shall be fastened or hinged to resist disassembly, breakings or prying open from the outside. Normal entry shall be possible only with the use of proper access tools. Latches and other provisions for locking hinged panels shall be furnished. e. There shall be no exposed screws, bolts or other fastening or hinging devices which are externally removable (with the exception of pentahead bolts provided for extra security) that would provide access to energized parts of the enclosure. 2. The transformer tank and enclosure shall be constructed of minimum 14 gauge steel. The radiator to be constructed of minimum 18 gauge steel. 3. In addition to the regular locking provisions, all access doors shall be secured by a recessed, captive, pentahead bolt which threads into a nut with a bind hole. A pentahead bolt will be considered "captive" when the retention scheme will prevent it from being readily removed during normal operation of the door(s) or the hood(s). The recess is to be nonrotating. The dimensions of the pentahead bolt and nonrotating recess shall comply with Figure 1 of ANSI C57.12.28-1988. If all doors can be secured with a single bolt, one bolt will be sufficient. 4 PADMOUNTED TRANSFORMERS Division 1 - General Reg uirements(continued) 4. Each latched door(s) shall be latched at a minimum of three points. In addition to the three-point latching, one pentahead bolt shall be coordinated with the latch and padlock to prevent unlatching and insertion of the padlock into the hasp when and until the bolt head is completely seated. Low profile cabinets, with access flip -up hoods, need only padlock and pentahead bolt provisions, and shall be coordinated to prevent insertion of the padlock into the hasp until the bolt head is completely seated. 5. The padlocking device shall be so designed and located as to resist prying or breaking off by screwdrivers, wrecking bars, tire irons, single -socket lug wrenches, or other readily accessible tools. The edges of the access doors or hoods shall be formed to provide: a. A close -fitting mating surface, with internal insertion - prevention lip that will be shaped to prohibit entry or prying by screwdrivers, wrecking bars, tire irons, single -socket lug wrenches, or other readily accessible tools. b. A rigid panel which, in conjunction with a handle -linkage - latching mechanism with three (or more) point latching, will resist bending in the event that sufficient force is applied to distort the compartment or compartment door(s) and permit prying access to the door edges. 7. Hinge pins shall be passivated AISI (American Institute of Steel Industries) Type 304 stainless steel, or approved equal. If a handhole cover is exposed, it shall be secured against tampering by some means accessible only from the inside of the compartment. The bottom edge of the enclosure shall provide for flush mounting on a flat, rigid, mounting surface to prevent wire entry into the compartment. PADMOUNTED TRANSFORMERS DIVISION 2 - SINGLE PHASE Pages 6, 7, and 8 of these specifications, pertaining specifically to Single -Phase Padmounted Transformers, have been intentionally omitted from this bid. PADMOUNTED TRANSFORMERS DIVISION 3 - THREE PHASE 3-1 GENERAL Enclosure to be in conformance with Division 1 of the specification. Maximum transformer height shall not exceed values listed in Table B below: TABLE B TRANSFORMER KVA MAXIMUM HEIGHT 300 KVA and below..............................................................65" 500 KVA................................................................................75" 750 and above......................................................................90" High and low voltage sections shall be separated and the low voltage door shall be equipped with a locking handle, and in addition, the doors so arranged that access to the high-voltage compartment can be gained only after opening the low -voltage door; doors shall be removable. Cables shall enter and leave the compartment sections from below, through openings in a concrete pad. Fastening of the oil drip plate and/or the fuse insertion restrictive device with a "U" clamp around the molded outer tube assembly is not acceptable. 3-2 BUSHING HEIGHTS Primary and secondary bushing locations and heights shall comply with the latest revisions of NEMA TRI and ANSI C57-12.26-1975 Standards for Type A primary and staggered low - voltage terminal arrangement. 3-3 STANDARD ACCESSORIES In addition to that specified in Division 1, transformers shall be provided with the following: 1. Pressure relief valve: Qualitrol 202-030-01, or approved equal. 2. Four (4) low voltage bushing spades (4 hole for 500 KVA and below, 6 -hole for 750 KVA and above, per ANSI C57.12.26). 3. Liquid level gauge, drain valve with sample valve and oil filler plug. Drain valve to be located in the high-voltage compartment. 4. Parking stands for each high-voltage elbow terminator. 5. Universal bushing wells, for high-voltage terminations. 9 PADMOUNTED TRANSFORMERS Division 3 - Three -Phase (continued) 6. Bay -O -Net fuse assemblies with molded outer tube, RTE Catalog #-4000361C99M, isolation link, or approved equal; and oil drip plate below fuse holder entrance. Fuse elements not to be installed, but to be supplied in a bag attached to a fuse holder handle. If the manufacturer desires to install the fuses, additional fuses (3) of the size and type specified shall be supplied in a bag attached to a fuse holder handle. 3-4 RATINGS AND DESIGN Dead front, radial feed design with three (3) universal bushing wells. 2. 12,000 volt Delta connected primary. 3. Three phase, 60 Hz, OISC. 4. 500 KVA and larger units only: On -Off loadbreak, gang -operated, oil -immersed switch. Switch handle with eye for operation with hot stick shall be located in high-voltage compartment. 5. Transformers shall be provided with RTE Bay -O -Net load sensing #4000358C or fault sensing #4000353C or approved equal fuse links in accordance with Table C. 6. Secondary voltage rating to be as specified on proposal form. 7. KVA ratings to be as specified on proposal form. U PADMOUTED TRANSFORMERS Division 3 - Three Phase (continued) TABLE C FUSE LINKS Three Phase Transformer Link KVA Designation Rating (Amp) Load Sensing 4000358() 75 C5 8 112.5 C8 15 150 C8 15 225 C10 25 300 C10 25 500 C12 50 Fault Sensing 4000353() 750 C14 65 1000 C16 100 1500 C17 140 11