HomeMy WebLinkAboutAgenda Report - August 2, 2006 E-05AGENDA ITEM E- 5
CITY OF LORI
COUNCIL COMMUNICATION
TM
AGENDA TITLE: Approve specifications and authorize advertisement for bids for polemount and
padmount transformers (EUD)
MEETING DATE: August 2, 2006
PREPARED BY: Electric Utility Director
RECONMENDED ACTION: That the City Council approve the attached specifications, and
authorize the advertisement for bids for polemount and padmount
transformers for the Electric Utility Department.
BACKGROUND INFORMATION: Manufacturers of distribution transformers are reporting delivery
lead-times in excess of forty weeks for certain types of polemount
and padmount units used in the City's electric system.
It is therefore necessary to solicit bids for the Department's anticipated needs for mid -2007.
Staff recommends advertisement for bids for the following transformers:
Polemount: 9 ea
37.5kVA single-phase circuit protected 120/240V secondary
13 ea 50kVA single-phase circuit protected 120/240V secondary
5 ea
25kVA single-phase conventional 120/240V secondary
Padmount: 1 ea
150kVA three-phase 208Y/1 20V secondary
1 ea
225kVA three-phase 480Y/277V secondary
3 ea
500kVA three-phase 480Y/277V secondary
FISCAL IMPACT: Initial cost (estimated $80,000, payment after delivery) is expected to be recovered
through future power sales.
FUNDING: Electric Utility Department -2007 Financial Plan a d Budget.
7 lc^ V-7 r4
G614e F. Worrow, Electric Utility Director
Prepared by Joel Harris, Purchasing Officer
cc: Elec`ical Engineer, EUD
APPROVED:
Blair Ki ity Manager
POLEMOUNT TRANSFORMERS — OIL FILLED SECTION 4
DETAILED SPECIFICATIONS
4.000 GENERAL REQUIREMENTS
Electrical design and materials shall conform to the latest EEI-NEMA and ANSI Standards. 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 bidder's manufacture in
service on the lines of electrical utilities over a period of years.
4.001 TESTS
Transformers shall receive at least the following tests in accordance with the applicable ANSI and NEMA
Standards:
(1)
Load and no-load loss
(2)
Exciting current
(3)
Polarity Check
(4)
Ratio check
4.002 SERVICE
(5) Applied and induced potential test
(6) Impulse voltage test
(7) Tank pressure test
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).
4.003 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.
4.004 TECHNICAL INFORMATION
The following specifications shall be met:
1. Insulation level: 95 kV BIL (min).
2. Insulation rating: 65® C rise.
3. Paint: All exterior surfaces shall be painted ANSI 70 gray, 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.
4. 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.
5. Tank: 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
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.
6. Nameplates: Stainless steel or anodized aluminum nameplate shall 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 nameplate. The nameplate shall include the
words; "Fluid is less than one p.p.m. PCB," (refer to Section 4.006). The instruction nameplate
shall contain the information specified in Section 5.12 of ANSI Standard C57.12.00-1993, or latest
revision.
7. Sound level: The sound level shall be equal to or better than EEI-NEMA Standards.
8. Size. Size of the transformer, including radiators (fins), shall not interfere with installation or G.O.
95 requirements when banked together on cluster bracket (Dixie Electric P-538 or approved
equal).
9. Pressure Relief Valve: The pressure relief valve shall be located a minimum horizontal distance
of four (4) inches from the vertical centerline of the transformer hanger brackets.
10. Height and Weight: Height and weight of the transformer shall be as listed below:
Size (kVA)
Maximum Weight (lbs.)
Maximum Height (inches)
including bushings
15
400
45
25
500
45
37.5
625
48
50
800
51
75
1,100
51
100
1,200
51
167
1,600
51
4.005 LOSSES
Losses will be considered in the evaluation of this bid as follows:
No-load (core) loss @ $3.75/watt
Load (winding) loss @ $1.25/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 .
pecifications: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.
4.006 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."
4.007 INSULATING FLUID
1. Type. The transformers shall be shipped completely filled with insulating fluid (oil). The oil shall
be inhibited, prepared, and refined such that it is compatible with existing acid refined oils and
with other oils available at the time of delivery. The oil shall be a Type II, antioxidant, inhibited
mineral oil (minimum) meeting ANSI/ASTM D3487, latest revision.
2. MSDS: Material Safety Data Sheets (MSDS) shall be submitted with each shipment of
transformers. The manufacturer/bidder shall indicate the transformer serial number(s) for which
the MSDS is applicable.
4.100 SINGLE PHASE UNITS
4.101 GENERAL
In addition to that specified in Sections 4.000-4.007, transformers shall be provided with the following:
1. High Voltage Bushings (Porcelain):
a. Quantity: Two
b. Bushing terminals to be clamp -type suitable for use with copper and aluminum conductor.
2. Low Voltage Bushings:
a. Quantity: 277 -volt: Two
All others: Three
b. Shall be tank wall -mounted.
C. Bushing terminals: 100 kVA and lower: Shall be clamp -type suitable for use with
copper and aluminum conductor. Over 100 kVA: Shall be
NEMA -4 pads (4 -hole)
3. Pressure relief valve: Qualitrol 202-030-01, or an approved equal.
4. Lifting lugs shall be welded to the tank.
5. Provide tank grounding pad and a visible tank -to -cover ground strap.
6. Hanger brackets, welded to the tank.
7. Hanger brackets shall permit bolting of transformer directly to pole.
8. Single phase, 60Hz, OISC.
4.102 RATINGS AND DESIGN
Transformers shall have the following ratings and design:
1. Distribution type, pole -bolted transformer.
2. 12,000 -Volt Delta primary.
3. Single phase.
4. Without arresters and taps.
5. Conventional or CP type as specified on proposal form. CP transformers to have one
weak link (fuse) per primary bushing and a breaker on the secondary side.
6. Secondary voltage to be as specified on the proposal form.
7. kVA rating to be as specified on the proposal form.
PADMOUNTED TRANSFORMERS SECTION 4
DETAILED SPECIFICATIONS
4.000 GENERAL REQUIREMENTS
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 the bidder's manufacture in service on the lines of electrical utilities over a period of
years.
4.001 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. Ratio check
4.002 SERVICE
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 a 200 -mile radius
of the City of Lodi).
4.003 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. The
manufacturer shall rectify all such defects by repair or replacement at the manufacturer's sole expense
and shall assume responsibility for associated shipping costs.
4.004 TECHNICAL INFORMATION
1. Insulation level: 95 kV BIL (min.).
2. Insulation rating:65° C rise.
3. Ground lugs: Two (2) ground lugs which accepts a range of #4 to 1/0 AWG copper
shall be provided.
4. Paint: The coating system shall be in accordance with ANSI C57.12.28, latest revision.
The finish color shall be Munsell Green No. 7GY3.29/1.5 (olive). 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 attachment on the transformer and to avoid
scratching the transformer coating. On single phase units, the lifting lugs may be removable.
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 mechanical 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, at time of manufacture", refer to section 4.006. The instruction
nameplate shall contain the information specified in Section 5.12.2 of IEEE (ANSI) C57.12.00, latest
revision. Bushing and fuse designations shall be marked by stenciled lettering on the tank. Decals will
not be accepted.
8. Sound level: The sound level shall be equal to or less than that specified in EEI-NEMA
Standards.
4.005 LOSSES
1. No-load: No-load (core) loss @ $3.75/watt
2. Load: Load (winding) loss @ $1.25/watt
3. Evaluation: The cost of losses will be added to the equipment price (bid price) F.O.B. Lodi,
including maximum escalation and taxes, to determine the evaluated low bid of vendor otherwise
meeting these specifications.
4. Guaranteed Loss Data: Bidders shall supply the following guaranteed loss data for use in the
evaluation, in addition to other data listed in the specifications:
A. No-load losses in watts at rated secondary voltage.
B. Load losses in watts at rated secondary voltage and rated load. The standard reference
temperature for load losses shall be 85° C.
C. 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.
5. Certified Test Report: 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 class (type and rating) of
transformer(s) will be averaged separately within their respective categories (no-load and load
losses). If the average tested no-load (core) and/or load (winding) losses of the transformer class
exceed the watt losses quoted in the proposal, the contract price shall be reduced by the above
amounts per watt of actual class averaged no-load and/or actual load losses 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.
6. Certified Test report of Losses: The manufacturer shall submit certified test reports of losses
prior to or at the time of shipment of the transformers.
4.006 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 at time of manufacture".
4.007 DIMENSIONS and DRAWINGS
The overall dimensions of the units (height, width, depth — height only for single-phase units) will be
considered in the evaluation of the bid. For three-phase units, the bidder shall submit drawings of the
units proposed in the bid.
4.008 LABELING
The transformers shall be shipped without the Safety Labels per NEMA No. 260-1991. The City will affix
its personalized "Mr. Ouch" label(s).
4.009 INSULATING FLUID
1. Type: The transformers shall be shipped completely filled with insulating fluid (oil). The oil shall
be inhibited, prepared, and refined such that it is compatible with existing acid refined oils and with
other oils available at the time of delivery.
The oil shall be a Type II, antioxidant, inhibited mineral oil (minimum) meeting ANSI/ASTM D3487,
latest revision.
2. MSDS: Material Safety Data Sheets (MSDS) shall be submitted with each shipment of
transformers. The manufacturer/bidder shall indicate the transformer serial number(s) for which the
MSDS is applicable.
4.010 PADMOUNT EQUIPMENT ENCLOSURES
A typical padmount equipment enclosure consists of a surrounding case or housing for the equipment to
prevent unauthorized access, to protect people against accidental contact with energized parts and to
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.
1. 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.
2. 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, breaking 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 penta head bolts provided for extra security) that
would provide access to energized parts of the enclosure.
F. The transformer tank and enclosure shall be constructed of minimum 14 gauge steel. The
radiator(s) to be constructed of minimum 18 gauge steel.
G. In addition to the regular locking provisions, all access doors shall be secured by a recessed,
captive, penta head bolt. A penta head bolt will be considered "captive" when the retention
scheme will prevent it from being readily removed during normal operation of the door(s) or
hood(s). The recess is to be non -rotating. The dimensions of the penta head bolt and non-
rotating recess shall comply with Figure 1 of ANSI C57.12.28, latest revision. If all doors can be
secured with a single bolt, one bolt will be sufficient.
H. Each latched door(s) shall be latched at a minimum of three points. In addition to the three point
latching, one penta head 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 penta head bolt
provisions, and shall be coordinated to prevent insertion of the padlock into the hasp until the bolt
head is completely seated.
I. 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.
J. The edges of the access doors or hoods shall be formed to provide: a) close fitting mating
surface, with internal insertion prevention lip and b) rigid panel which, in conjunction with a
handle -linkage -latching mechanism with three (or more) point latching, will resist bending in the
event sufficient force is applied to distort the compartment door(s) and permit prying access to the
door edges.
K. Hinge pins shall be passivated AISI (American Institute of Steel Industries) Type 304 stainless
steel, or approved equal.
L. Handhole covers, if exposed when the enclosure is secured, shall be secured from the inside of
the enclosure.
M. The bottom edge of the enclosure shall provide for flush mounting on a flat, rigid mounting surface
to prevent wire entry into the compartment.
4.011 FUSES
The transformers shall be fused with RTE® Bay -O -Net fuse assemblies and in series Isolating Links.
The fuse and link sizes are shown in tables A and C, respectively, for single-phase and three-phase
units. The Bay -O -Net assembly shall be Cooper Power Systems with Flapper TM valve or ABB "DO III"
with went hole and check valve.
An oil drip system similar to RTE® drip guard or a metal tray mounted on the tank wall below the fuse
holder entrance shall be supplied. The metal tray shall be designed such that any insulating fluid
captured in the tray will not drain onto bushings and/or cable assemblies located below the drip tray.
Fastening of an oil drip device to the fuse assembly with a "U" bolt is not acceptable. Fuse element(s)
shall not be installed, but supplied in a bag attached to the fuse holder handle. If the manufacturer
desires to install the fuse(s) an additional fuse(s) of the size and type specified shall be supplied in a bag
attached to the fuse holder handle.
4.012 PRESSURE RELIEF DEVICE
An automatic pressure relief device shall be provided, having the characteristics and installed in
accordance with ANSI C57.12.26, latest revision.
4.100 SINGLE PHASE UNITS
Does not apply to this bid.
4.200 THREE PHASE UNITS
4.201 ENCLOSURE
Transformer enclosure to be in conformance with section 4.010, of this specification.
Maximum transformer height shall not exceed values listed in Table B, below.
High and low voltage compartments shall be separated, the low voltage compartment door shall be
equipped with a locking handle. In addition, the doors shall be so arranged that access to the high
voltage compartment can be gained only after opening the low voltage compartment door. The doors
shall be removable.
Cables shall enter and leave the transformer from below through openings in a concrete pad.
Table B
Transformer Height
Transformer
WA
Height (maximum)
Inches
300 kVA and below
65
500 kVA
75
750 kVA and above
90
4.202 TERMINALS
Primary: Primary bushing and parking stand positions shall be in accordance with ANSI Standard
C57.12.26, Figure 1, latest revision.
Secondary:
1. The low voltage bushing arrangements and clearances shall be in accordance with ANSI Standard
C57.12.26, latest revision, Figure 8a (Staggered Low -Voltage Terminal Arrangement). For units 225
kVA and below, Figure 4a is acceptable.
2. The neutral terminal shall be a fully insulated bushing.
3. Low voltage terminals on units rated 300 kVA and above shall be equipped with bushing supports.
The bushing supports shall be attached to the end of the spade. The support shall not hinder or
interfere with any cable lugs to be attached to the spade at any of the hole locations.
4. The low voltage terminals shall be NEMA spade terminals per ANSI Standard C57.12.26, latest
revision, Figure 9a, 9b, 9c or as specified below:
225 kVA units and below: four (4) hole NEMA spade terminals.
300 kVA units: six (6) hole (minimum) supported NEMA spade terminals.
500 kVA units: eight (8) hole (minimum) supported NEMA spade terminals.
750 kVA units and above: ten (10) hole supported NEMA spade terminals.
4.203 STANDARD ACCESSORIES
In addition to that specified in sections 4.000 — 4.012, of this specification, the transformers shall be
provided with the following:
1. Pressure relief valve.
2. Liquid level gauge, drain valve with sample valve and oil filler plug. Drain valve to be located in the
high voltage compartment.
3. Parking stands (3) for each high voltage elbow terminator.
4. Three (3) high voltage universal bushing wells. The bushing wells shall comply with all applicable
requirements of ANSUIEEE 386, latest revision, and shall be fixed stud type.
5. Bay -O -Net fuse assembly and Isolation link (see Table C below for ratings).
4.204 IMPEDANCES
Transformer impedances shall not be less than the following:
150 kVA and below 2.0%
225 kVA and 300 3.5%
kVA
500 kVA 4.0%
750 kVA and above 5.3%
4.205 RATINGS AND DESIGN
1. Dead front, radial feed with three (3) universal bushing wells.
2. Voltage: 12,000 volt Delta connected primary.
3. Single-phase, 60 Hz, OISC.
4. 500 kVA and larger units only:
A. On -Off loadbreak, gang operated, oil immersed switch.
B. Switch handle with eye for operation with hot stick shall be located in high voltage compartment.
5. Transformers shall be provided with RTE dual sensing Bay -O -Net #4000358C( ) or current sensing
#4000353C( ) or approved equal fuse links and Isolation links in accordance with Table C.
6. kVA rating to be as specified on proposal form.
7. Secondary voltage rating to be as specified on proposal form.
4.206 FUSE LINKS
Table C
Fuse Links (Three -Phase)
Transformer
kVA
Designation
Dual Sensing
4000358C
Bay -O -Net
Link Rating
Am
Isolation Link
3001861A( )
75
05
8
02M
112.5
08
15
03M
150
08
15
03M
225
10
25
05M
300
10
25
05M
500
12
50
06M
Designation
Current Sensing
4000353C
750
14
65
05M
1000
16
100
05M
1500
17
140
05M
End of Section 4