HomeMy WebLinkAboutAgenda Report - November 19, 1997 (78)AGENDA TITLE: Approval of Specifications and Authorization to Advertise for Bids
for Polemount and Padmount Transformers for Fiscal Years 1997-99
MEETING DATE: November 19, 1997
PREPARED BY: Electric Utility Director
RECOMMENDED ACTION: That the City Council approve the attached specifications, and authorize
the Electric Utility Department and Finance Department's Purchasing
Division to advertise for bids as necessary to meet the Electric Utility Depart-
ment's requirements for polemount and padmount transformers through the Fiscal Year ending June 30, 1999.
BACKGROUND INFORMATION: As the City adopts a more accelerated approach to installing new electric
service and upgrading existing services, the Electric Utility Department
and the Purchasing Division have been seeking ways to more efficiently
acquire transformers.
While larger, once -a -year transformer purchases would ensure that transformers would be in our inventory at any
particular time, lack of clear forward visibility for up to a year and a half (bid time + delivery lead time + coverage
time) limits any assurance that the transformers in stock would indeed be the right ones. However, smaller, more
frequent orders can provide the flexibility to react to actual needs, and to read to changes in inventory. While
such an approach would increase the number of bids to be processed, overall inventory levels could be reduced
(freeing funds to earn interest), and the Department would have greater assurance that the transformers in
inventory or on order will be the ones needed for any specific job.
This proposal would allow the City to advertise for bids as requirements become known, and to open and evaluate
bids (as is currently done), without frequently seeking City Council approval to do so. The Department would then
return to the City Council with recommendations to award based on evaluated life -cycle costs as determined from
each bid. Under "fast-track" conditions, the Department would be allowed to award only those transformers
needed for the "fast-track" project, and, at the next regularly scheduled City Council meeting, report to the Council
the award and the basis for award.
Specifications for polemount and padmount transformers that apply to this proposal are attached.
The list of transformers to be included in the first bid solicitation is shown on Exhibit A. These transformers will be
used to serve new commercial and industrial loads at Kettleman Lane and Lower Sacramento Road, at Kettleman
Lane and Cherokee Lane, and on Industrial Way.
A portion of this initial bid will also be used in residential developments at Sylvan Way and Kettleman Lane, as
well as within the Lodi West subdivision, and will enable the Department to begin to replenish inventory for the
1998 peak load season.
FUNDING: Electric U" epa ent's O ratin Plan, Page E-22
Alan . Vallow, E ectri Uti r o
Prepared by Joel Harris, Purchasing Officer
APPROVED:
TRANSFMR.CCA
Dixo Flynn -- 04 Manager
11!10197
EXHIBIT A
POLEMOUNT TRANSFORMERS
Single-phase Circuit -Protected, 12,000 volt primary, 120/240 volt secondarX
3 ea 25 KVA
5 ea 37.SKVA
8
Single-phase Conventional, 12,000 volt primary, 277 volt secondga
3 ea 100KVA
Total Polemounts: 11
PADMOUNT TRANSFORMERS
Single-phase, 12,0009rdY/6,930 volt primary, 240/120 volt secondary
10 ea 50KVA
10 ea 75KVA
20
Three-phase, 12,000 volt A. 208Y/120 volt secondary
2 ea 150KVA
Three-phase. 12,000 volt A. 480Y/277 volt secondarX
1 ea 500KVA
1 ea 1,500KVA
2
Total Padmounts: 24
Estimated Cost (this purchase): $80,000
SPECIFICATIONS
POLEMOUNTED TRANSFORMERS - OIL FILLED
DIVISION 1 - GENERAL REQUIREMENTS
1-1 GENERAL
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.
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.
1-5 TECHNICAL INFORMATION
The following specifications shall be met:
Insulation level: 95 kv BIL (min).
2. Insulation rating: 65 0 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
H:IUSERIADM INISPECSIPOLEXFRM. BK!
POLEMOUNT TRANSFORMERS - OIL -FILLED Sec. 1 Pg. 1
General Requirements
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. Nameplate: 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 1-7). The instruction
nameplate shall contain the information specified in Section 5.12 of ANSI
C57.12.00-1980.
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. Height and Weight: Height and weight of the transformer shall be as listed
below:
10. Pressure Relief Valve: The pressure relief valve shall be located a minimum
horizontal distance of five (5) inches from the vertical centerline of the
transformer hanger brackets.
Size (KVA)
Maximum Weight (Ibs)
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
R USER1ADMINISPECSTOLUFRM.BK!
POLEMOUNT TRANSFORMERS - OIL -FILLED Sec. 1 Pg. 2
General Requirements
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:
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 losses shall be 850C.
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 (PCS). 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."
H:\USER\ADMIN\SPECS\POLEXFRM. BK!
POLEMOUNT TRANSFORMERS - OIL -FILLED Sec. 2 Pg. 1
General Requirements (continued)
DIVISION 2 - SINGLE PHASE
2-1 GENERAL
In addition to that specified in Division 1 - General Requirements, 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: 100KVA and lower: Shall be clamp -type suitable
for use with copper and aluminum conductor.
Over 100KVA: 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.
2-2 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.
H.\USEMADMIN%SPECSIPOLEXFRM. BK!
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 Lucas: 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.
Fa
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 Requirements(continued)
1-10 PADMOUNTED EQUIPMENT ENCLOSURES
A. General:
A typical 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.
2. 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:
1. 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.
PADMOUNTED TRANSFORMERS
Division 1 - General Rea 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.
8. If a handhole cover is exposed, it shall be secured against tampering by
some means accessible only from the inside of the compartment.
9. The bottom edge of the enclosure shall provide for flush mounting on a flat,
rigid, mounting surface to prevent wire entry into the compartment.
Division 2
(Pages 6, 7, and 8),
pertaining solely to
single-phase padmount transformers,
has been intentionally omitted from these specifications.
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 TR1 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.
E
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
1. 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.
10
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