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HomeMy WebLinkAboutAgenda Report - January 15, 1992 (65)"14 utwo CITY of LooI COUNCIL 1�@WWAOXRIW AGENDA TITLE: Specifications and Advertisement for Bids for Padmount Transformers MEETING DATE: January 15, 1992 PREPARED BY: Electric Utility Director RECOMMENDED ACTION: That the City Council approve the specifications and authorize advertisement for bids for the purchase of five three-phase gadm(,unt transformers of various ratings. BACKGROUND INFORMATION: The transformers will be used in the electric distribution system in various locations expected to be under construction in late 1992. Oue to lead times of 16 to 22 weeks after placement of orders, it is necessary to bid and purchase this equipment at this time to meet the anticipated construction period. The bid opening "as been scheduled for Tuesday. February 18, 1992. F0 0 ING: The estimated cost of this purchase is 538,000, Y,ith funding available in the Electric Utility Department's Operating Fund. Henry J. Rice, Electric Utility Director cc: Assistant Electric Utility Director Electrical Engineer 00 APPROVED F 7 THOMAS A PETERSON-- %4 - .eCYC-.0 P&P*, City M©nn9w Cc -i SPECIFICATIONS PADNOUNTED TRANSFORMERS DIVIS:0N 1- GENERAL REC,;1REMENTS 1-1 GENERAL Electric?'] design and materials shall conform to the latest EE1-NEM" arc ANSI Stananrds for Oil -Filled Equipment. ;t is the intent of these specifications to describe equipment of the best desicn and construC4ior.. for the service for which it i s intended. Conseauently. it shall be tr;e City's desire to award contracts to the bidder who has demonstrated hieh quality by having a considerable number of transformers of his rnanu#acture in service on the lines of electrical utilities over a Deriod of years. 1..? TFSTC Transformers shall receive at lerst the following tests i n accordance with the applicable ANSI and NEK Standards: (1) Load and no-load loss (2) Exciting current (3) Polarity check (e, Ratio check 1-1 CFPX/ Ir..F (5) Applied and induced poten_,atest (6) Impulse voltage test 7) Tank pressure test The manufacturer shall own and operate a service snoF in this vicirity, or the bidder may submit evidence that he has a repair contract with ar approved service shop in this vicinity. which has been i n effect for a period of a least one year. (For the purpose of this svecific,ation: Vicinity shall rrrean within a 200-r:zile radius of the cite of Lodi,. 1-4 GUARANTEE The manufacturer steal' guarantee all equipmen; de i, veree under thes4 specifications against, any and all aefects in material and/or workmans�"r for a period of it leas? one year fron aatn of accentarce. Tne manufa; LUrA' shall rectify all sucr defects thv repair or reolacempr- a: nis vwr exriensc- and assume responsibilitY for essoclatec shipping tests. -1- S#TRANSF.PA6j TXTU.01D 01/06/92 PADMOUNTEC TRANSFORMERS Division 1 - General Reouirements (continued) 1-5 TECHNICAL INFORMA-ION The foliow4nc specifications shall be met: i. Insuiation leve: 95 ►.v BIL (min.). ?. Insulation ratina: 65'C rise. 3. Ground Lugs: Two (2) ground lugs which acceot a ranee of #4 to 1/0 AWG copper shall he provided. 4. Paint: All exterior surfaces shall be paintec Munsell 7GY3.29/1.5 =1Ve) preen (or approved eoval), using a system of coordinated and thoroughly tested materials and application techniques that will assure long life. Special attentior shall be given to welds, seams, edges and rough spots. 5. Liftina Luas: Lifting iugs shall be provided on the tank and shall oe 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 eoual tc or greater t�,a 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 od manufacturing and design practices prevalent in the transfori.er industry, and together they should contribute to a high quality product. 7. ftamepiates: Stainless steel or anodized aluminum nameplate shell be securely attached to the transformer by means of metal screws, rivets or similar mechanical device(s). The letters and numbers shall be stamped or engraved on the ramepl ate. The nameplate shall include the words, "Fluid is less I,han 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. S. Sound Level: The sound level shall be equal to or better than EE -NEMA Standards. 7 _k T.(1CQVV Losses will be considered in the evaluation of this bid as follow:: No-load (core) loss @ S6.00/watt. Load (winding) loss @ 52.00/watt. -2- S#TRANSF.PAD/TXTU.OID 01/06/92 PAOMOOVE4 TRANSFORMERS Division 1 - Gerj?rat Requirements (continued) The cost of losses will be added to the equipment price (bid orice) F,0.8, Lodi, includino maximum escalation, to determine the evaluated low bid of vendor otherwise meeting these specifications. All bidders shall supply the €ollowinq 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. toad 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 lass measurement error of the test equipment and meesurement method to be used. including the basis for determination of the accuracy of the test eouipment 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 average6 ne-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 bidoer for acts l 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 to contain less than one p.p.m. by weight (mg/kg) polychlorinated biphenyls ("CS), Certified test report of PCB content shall be produce6 upon request. The transformer nameplate to include the words, "Fluid s less than one p.p,m. PCE." 1-8 DIMENSIONS The overall dimensions of the units (height. width. deoth - height only for single-phase units) will be considered it ?he evaluatior of this bid. 1-9 LABELING The units are to be shipped without the Safety Labels per ��EMA too, 260-1982. The City will affix its personalized "M-. Ouch" labels. -3- S#TMA SF,PA0/TKTU.010 Oi/06/92 PADMOUNTED TRANSFORMERS Division 1 - General Requirnients (Continued' 1-10 PADMOUKTED EQUIPMENT ENCLOSURES A. General: 1. A typical paomounted equipment enciosure consists of a surrounding case or housing for equipment to prevent unauthorized access to protect people aaainst accioental contact of energized parts and protect eouipment against weather hazards. The enclosure i s mounted on a pad, above around level, and may be ventilated to permit circulation of air. 2. Entry into the enclosure shall be through either access door(s) or hood(s) as specified. B. Structural Strength and intearity Test: The structural strength and integrity test shall comply with the latest NEMA and ANS; Standards for testino, design and enclosure security. C. Construction: 1. The construction shall be such that: a. It arevents the entry of foreiar objects. such as sticks, rods or wires. b. It inhibits dismantlinc of the eouipment. 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 pryinc 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 hingina 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 tranrformer tank and enclosure shall be constructed of minimurr. 14 aauoe steel. The radiator to be constructed of minimum 18 gauge steel. -4- $#TRANSF.PAD/TXTU.01D 01/06/92 PApM01lNTED TRAKSFORMERS Division 1 - General Requirements (continued) 3. In addition to the regular locking provisions, all access doors shall be secured by a recessed. cap ti\re, pentaheac bolt whicr threads into a nut with a blind hole. A pentahead bolt shall be considered "captive" when the retention scheme will prevent it from bein readily removed during normal operation of the door(s) or the hoods). The recess is to be nonrotating. The dimensions of the (pentahead bolt and nonrotating recess shall comply with Figure 1 of 'the ANSI C57.12.28-1988. I f ail doors can be secured with a single 'bolt, one bolt will be sufficient. 4. Each latched door(s) shall he 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 nead is completely seated. Low profile cabinets, with access flip -!s^ hoods. need only padlock. and pentahead bolt croOsions, and snall b, - coordinated to prevent insertion of the gad loci: into the hasp until the bolt head is completely seated. 5. The padlocking device shall be so designed ?n;+ located as to resist Drying or breaking off b,v screwdrivers, wreciine bars, tire irons, single -socket lug wrenches, or other readily accessible tools. 6. The :�dq?s of the access doors or hoods shall be formed to provide: a. A close -fitting mating surface, with internal insertion- pre�, !ration 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 edaes. i, Hinge pins shall be passivated A!SI (American ins -:cute of Steel industries! Type 304 stainless steel, or approved eoual. 8. If a handhole cover is exposed, it shall he secured against tamperinq by some means accessible only from the inside of the compartment. 9. Tne bottom edge of the enclosure shall provide for flush mounting on a flat, rigid, mounting surface tc prevent wire entry into the compartment. -5- 5#TRANSF.PAD/TXTU.010 01/06/92 PAOMOUNTED TRANSFORMERS DIVILSION 2 - SINGLE-PHASE 2-1 GENERAL Transformer enclosures to be it conformance with Division 1 of this specificatioe and be of the low -profile design. maximum height for 75 KVA and below shall he 28", and for 100 I' VA and above shall be 33". The access door shall oper. ;.o the top 180' and be removable. The design shall be dead front, loop feed. Cables shall enter and leave the transformer from below through openings in a pad. The front plate of the transformer tank shall be constructed (reinforced) in such a manner that tank pressure does not cause any reduction in clearances between the energized parts and grounded surfaces, i.e. deflection resulting it Spades and bushings moving toward the sides of the door. The Bay-@-Netfuse shall he positioned in such a- way that the fuse assembly can be inserted and locked i n any position without interfering with the closed door. Fastening_ of the oil drip plate and/or the fuse insertion. restrictive device with a "U" clamp around the molded outer tube assembly i s not acceptable. 2-2 BUSHING HEIGHTS Primary and secondary bushinc heights shall comply with the latest revisions of NEMA TR! and ANSI C57.12.25-!981 Standards, Type 2 Arrangement Figure 2(b). 2-3 STANDARD ACCESSORIES In addition to that specified in Division 1, transformers shall be provided with the following: 1. Pressure relief valve, Qual i trot 202-030-01, or approved equal. 2. Low voltage terminals. 4 -hole in-line spsde type (all insulated), which may be rotated to allow convenient connection of cables. 3. Oil filler and drain plugs. 4. Two (2) parking stands for high-voltage terminations. 5. Two (2) loop feed. high-voltage universal bushing wells. G. Bay -O -Net fuse assembly with molded outer tube, RTE Ca to 1 or, #4000361C99M, isolation link, or approved equal; and oil drip plate below fuse holder entrance. Fuse element not to be installed, but supplied in a bag attached to fuse holder handle. -6- S#TRANS,F.PAD/TXTU.01D 01/06/92 PAOMOUNTEO TRANSFORMERS Division 2 - Single-Phzse (continued) 2-4 RATINGS AND DESIGN 1. Dead front, loop feed with two (2) universal bushing welts. 2. Voltaae: 12,000 Grd.Wye/6930 volts prirary to 2401120 volts secondary. 3. Single phase, 60 Hz, DISC. 4. Transformers shall be provided with RTE Bay--O-Net load sensing #4000358C or approved eoual fuse links in accordance with Table I. 5. KVA ra -i ng to be as specified or. proposal form. _7_ SOTRANSF.PAD/TXTU.O1© 01/06/92 PAOMOUNTEO TRANSFORMERS Division 2 - Sinale-Phase (continued) TABLE I Single Phase Transfcrmer ;.ink Designation KVA 4000358( ) Rating (Amp) 10 c5 1 8 50 I CE 15 75 CIO 25 100 CID 25 i f! 167 c12 50 i -a- S#TRANSF.PAD/TXTU.O1D 01/06/92 PADMOUNTEO TRANSFORMERS DIVISION 3 - THREE PHASE 3-1 GENERAL Enclosure to be in conformance with Division 1 0` the specificatioa. Maximum transformer height shall not exceed values listed in Table A beiow: TABLE A 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 speci~ied 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 NEMA [square: on 300 KVA and below; 6 -hole [or more] NEMA [square? on 50C KVA and above). 3. Liquid level gauge, drain valve with sample valve and oil filler plug. Drain valve to be located in the hign-voltage compartment. 4. Parking stands for each hiah-voltage elbow terminator. 5. Universal bushing wells, for high-voltage terminations. -9- S#TRANSF.PAD/TXTU.01D 01/06/92 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 bac attached to fuse holder handle. 3.-4 RATINGS AND DESIGN 1. Dead front-, radial feel design with three (3) universal bushing wel 1s. 2. 12,000 -vol t Delts-connected primary. 3. Three phase. 60 Hz, OISC. 4 . 500 KVA and larger units only: Or -Off loadbreak. gang -operated. oil -immersed switch. Switch handle with eye for operation with hot stick shall be located i n high-voltage compartment. 5. Transformers shall be provided with RTE Bay -O -Net load sensing #40OC35BC or fault sensing #4000353C or approved equal fuse links i n accordance with Table II. 6. Secondary voltage rating tc be as specified on proposal form. 7. KVA ratings to be as specified or, proposal fonr. still SXTRANSF.PAD/TXTU.OID PADMOUNTED TRANSFORMERS Division 3 - Three -Phase (continued) TABLE II -li- S#TRANSF.PAD/TXTU.OIO 01/06/92 Three Phase 12,000 -volt i Delta Transformer Link KVA Designation Rating (Amp) Load Sensing 4000358( } i 75 C5 8 112.5 CB 15 f 150 C8 15 225 CIO i 25 300 CIO I 25 500 C12 50 Fault Sensinc_ 4000353( } i 750 C14 65 t 1000 f C16 i00 1500 CI7 140 -li- S#TRANSF.PAD/TXTU.OIO 01/06/92