HomeMy WebLinkAboutAgenda Report - July 6, 1994 (63)f j
OR
CITY OF LODI
COUNCIL COMMUNICATION
AGENDA TITLE: Specifications and Advertisement for Bids for
Padmount Transformers ($20,000)
MEETING DATE: July 6, 1994
PREPARED BY: Electric Utility Director
RECOMMENDED ACTION: That the City Council approve the specifications
and authorize advertisement for bids for five
three-phase 75KVA padmount transformers.
BACKGROUND INFORMATION: These transformers are planned for use in new
developments such as Sunwest Plaza II and Lodi
Town Plaza, and to replenish the Department's
inventory.
FUNDING: Estimated Cost: $20,000
Budget: Electric Utility Department's Operating
Fund.
RID OPENING DATE: August 16, 1994
Henry J. Rice, Electric Utility Uirector
cc: Assistant Electric Utility Director
Electrical Engineer
Prepared by Joel Harris, Purchasing Officer
APPROVED
THOMASA. PETERSON 1�ycied Pape,
` Crty Manager
A
CC
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
(2) Exciting current
(3) Polarity check
(4) Ratio check
1-1 SFRVICF
(5) Applied and induced potential test
(5) 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 that he has 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. The manufacturer
shall rectify all such defects by repair or replacement at his own expense
and assume responsibility for associated shipping costs.
-1-
S=TRANSF.PAD/TXTU.01D 01/06/92
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 Lu L Two (2) ground lugs which accept a range of #4 to
r7O_TW copper shall be provided.
4. Paint• All exterior surfaces shall be painted Munsell 7GY3.29/1.5
TOT'ive) 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
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," 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.
1-1; l MSFS
Losses will be considered in the evaluation of this bid as follows:
No-load (core) loss @ 36.00/watt.
Load (winding) loss @ S2.00/watt.
-2-
�oTRANSF.PAD/TXTU.016
01/06/92
PADMOUNTED TRANSFORMERS
Division 1 - General Requirements (continued)
The cost of losses will be added to the equipment price (bid price) F.O.B.
Lodi, including maximum escalation, 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 to
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 uiits) 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.
-3-
S_"TRANSF.PAD/TXTU.01D 01/06/9?
PADMOUNTED TRANSFORMERS
Division 1 - General Requirements (continued)
1-10 PADMOUNTED EQUIPMENT ENCLOSURES
A. General:
1. 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 s! -ch 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.
-4-
S=TPANSF.PaD/TXTU.01D 12/08/93
PADMOUNTED TRANSFORMERS
Division 1 - General Requirements (continued) `
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 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. If all doors can be secured with a single
bolt, one bolt will be sufficient.
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. !ow 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.
6. 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.
-5-
TRANSF.PAD/TXTU.O10 01%06/92
PADMOUNTED TRANSFORMERS
DIVISION 2 - SINGLE-PHASE
2-1 GENERAL
Transformer enclosures to be in conformance with Division 1 of this
specification and be of the low -profile design, maximum height for 75 KVA
and below shall be 28", and for 100 KVA and above shall be 330. The access
door shall open to 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 in spades and bushings moving toward the
sides of the door.
The.Bay-O-Net fuse shall be positioned in such a way that the fuse assembly
can be inserted and locked in any position without interfering with the
closed door. Fastening of the oil drip plate and/or the fuse insertior
restrictive device with a "U" clamp around the molded outer tube assembly is
not acceptable.
2-2 BUSHING HEIGHTS
Primary and secondary bushing heights shall comply with the latest revisions
of NEMA TRI and ANSI C57.12.25-1981 Standards, Type 2 Arrangement Figure
2(h).
2-3 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. Low voltage terminals, 4 -hole in-line spade 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 nigh -voltage terminations.
5. Two (2) loop feed, high-voltage universal bushing wells.
6. Bay -O -Net fuse assembly with molded outer tube, RTE Catalog
#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=TRANSF.PAD,TXTU.01D 011/06/92
PADMOUNTED TRANSFORMERS
Division 2 - Single -Phase (continued)
2-4 RATINGS AND DESIGN
1. Dead front, loop feed with two (2) universal 5ushing wells.
2. Voltage: 12,000 Grd.Wye/6930 volts primary to 240/120 volts
secondary.
3. Single phase, 60 Hz, OISC.
4. Transformers shall be provided with RTE Bay -O -Net load sensing
#4000358C or approved equal fuse links in accordance with Table I.
5. KVA rating to be as specified on proposal form.
-1-
S#TRANSF.PAD/TXTU.01D 01/06/92
PADMOUNTEO TRANSFORMERS
Division 2 - Single -Phase (continued)
TABLE I
FUSE LINKS
Single Phase
.Transformer
L ik
Designation
KVA
4000358( ) Rating (Amp)
10
C5
8
15
C5
8
25
C5
8
37.5
C8
15
50
C8
I 15
I
75
C10
25
100
C10
25
167
C12
I 50
-8 -
S#TRANSF.PAD/TXTU.010 01/06/92
PADMOUNTEO TRANSFORMERS
DIVISION 3 - THREE PHASE
'3_1 CCNCDdI
Enclosure to be in conformance with Division 1 of the specification.
Maximum transformer height shall not exceed values listed in Table A below:
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 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 NEMA [square] on 300
KVA and below; 6 -hole [or more] NEMA [square] on 500 KVA and above).
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 bush ng wells, for high-vo tage 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 bag attached to 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 II.
6. Secondary voltage rating to be as specified on proposal form.
7. KVA ratings to be as specified on proposal form.
-10-
S#TRANSF.P.AD/TXTU.OID 01/06/92
PADMOUNTED TRANSFORMERS
Division 3 - Three -Phase (continued)
TABLE II
FUSE LINKS
Three Phase
12,000 -volt Delta
Link
Transformer
Designation
Rating (Amp)
KYA
Load Sensing
4000358( )
75
C5
8
112.5
C8
15
150
C8
15
225
C10
25
500
C10
25
500
C12
50
Fault Sensing
4000353( }
750
C14
65
1000
C16
100
1500
C17
140
-11-
S#TRANSF.PAD/TXTU.01D 01/06/92