HomeMy WebLinkAboutBID - 8145 TRANSFORMERS 75KVA SUBMERSIBLE SINGLE PHASE WITH OVERCURRENT PROTECTIONINVITATION TO BID
8145 TRANSFORMERS, 75KVA SUBMERSIBLE, SINGLE PHASE WITH
OVERCURRENT PROTECTION
BID OPENING: 3:00 P.M. (our clock), JULY 29, 2015
The City of Fort Collins is requesting bids from firms for 75kVA, submersible, single
phase with overcurrent protection transformers.
Bid submission via email is preferred. The Bid Spreadsheet shall be submitted in
Microsoft Excel format, other documents may be submitted in Word or pdf format. All
documents are to be e-mailed to: purchasing@fcgov.com.
Bids will be received before 3:00 p.m. (our clock), July 29, 2015 and referenced as
Bid No. 8145.
The City encourages all disadvantaged business enterprises to submit bid in response
to all invitations and will not be discriminated against on the grounds of race, color,
national origin.
Any questions or inquiries regarding this bid should be directed to: Pat Johnson,
CPPB, Senior Buyer at (970) 221-6816 or pjohnson@fcgov.com.
Special Instructions
All bids must be properly signed by an authorized representative of the company with
the legal capacity to bind the company to the agreement. Bids may be withdrawn up to
the date and hour set for closing. Once bids have been accepted by the City and
closing has occurred, failure to enter into contract or honor the purchase order will be
cause for removal of supplier's name from the City of Fort Collins' bidders list for a
period of twelve months from the date of the opening. The City may also pursue any
remedies available at law or in equity. Bid prices must be held firm for a period of forty-
five (45) days after bid openings.
Submission of a bid is deemed as acceptance of all terms, conditions and specifications
contained in the City's specifications initially provided to the bidder. Any proposed
modification must be accepted in writing by the City prior to award of the bid.
Only bids properly received by the Purchasing Office will be accepted. All bids should
be clearly identified by the bid number and bid name contained in the bid proposal.
No proposal will be accepted from, or any purchase order awarded, to any person, firm
or corporation in default on any obligation to the City.
Financial Services
Purchasing Division
215 N. Mason St. 2nd Floor
PO Box 580
Fort Collins, CO 80522
970.221.6775
970.221.6707
fcgov.com/purchasing
Bids must be furnished exclusive of any federal excise tax, wherever applicable.
Bidders must be properly licensed and secure necessary permits wherever applicable.
New Vendors:
The City requires new vendors receiving awards from the City to fill out and submit an
IRS form W-9 and to register for Direct Deposit (Electronic) payment. If needed, the W-
9 form and the Vendor Direct Deposit Authorization Form can be found on the City’s
Purchasing website at www.fcgov.com/purchasing under Vendor Reference
Documents.
The City may elect where applicable, to award bids on an individual item/group basis or
on a total bid basis, whichever is most beneficial to the City. The City reserves the right
to accept or reject any and all bids, and to waive any irregularities or informalities.
Sales prohibited/conflict of interest: no officer, employee, or member of City Council,
shall have a financial interest in the sale to the City of any real or personal property,
equipment, material, supplies or services where such officer or employee exercises
directly or indirectly any decision-making authority concerning such sale or any
supervisory authority over the services to be rendered. This rule also applies to
subcontracts with the City. Soliciting or accepting any gift, gratuity, favor,
entertainment, kickback or any items of monetary value from any person who has or is
seeking to do business with the City of Fort Collins is prohibited.
Freight terms: unless otherwise noted, all freight is F.O.B. Destination, Freight Prepaid.
All freight charges must be included in prices submitted on proposal.
Discounts: any discounts allowed for prompt payment, etc., must be reflected in bid
figures and not entered as separate pricing on the proposal form.
Purchasing restrictions: your authorized signature of this bid assures your firm's
compliance with the City's purchasing restrictions. A copy of the resolutions is available
for review in the Purchasing Office or the City Clerk's Office. Request Resolution 91-
121 for cement restrictions.
Collusive or sham bids: any bid deemed to be collusive or a sham bid will be rejected
and reported to authorities as such. Your authorized signature of this bid assures that
such bid is genuine and is not a collusive or sham bid.
Bid results will be posted online at www.rockymountainbidsystem.com.
Gerry S. Paul
Director of Purchasing and Risk Management
8145 TRANSFORMERS, 75KVA SUBMERSIBLE, SINGLE PHASE
WITH OVERCURRENT PROTECTION
WE HEREBY ENTER OUR BID FOR THE CITY OF FORT COLLINS'
REQUIREMENTS FOR TRANSFORMERS, 8145 TRANSFORMERS, 75KVA
SUBMERSIBLE, SINGLE PHASE WITH OVERCURRENT PROTECTION PER THE
BID INVITATION AND ANY REFERENCED SPECIFICATIONS.
QUANTITY: DESCRIPTION:
10 ea. T1100161 Transformer, 75 kVA submersible, single phase
with overcurrent protection per specification. One cover
mounted separable insulated load break high voltage
bushing well, three cover mounted stud secondary bushings.
High voltage rating: 13200 grdy/7620, low voltage rating:
240/120.
PER SPECIFICATION #368-110-161, REVISION J.
Please complete the Excel spreadsheet issued separately
for bid submittal. The spreadsheet MUST be submitted
in Excel format only. Failure to submit in the format
requested may cause the submittal to be deemed
incomplete and may be subject to rejection.
IF YOU ELECT TO PASSWORD PROTECT YOUR BID,
PLEASE NOTE THAT PASSWORD IN A SEPARATE
EMAIL TO purchasing@fcgov.com at the time of bid
submittal.
*Any surcharges or additional costs shall be noted & included in bid submittal.
Delivery lead time may be a consideration of bid award.
For purposes of warranty and service ONLY approved manufacturers or distributors
authorized by an approved manufacturer to serve the Fort Collins area may bid.
Awards from this bid will be based primarily on the evaluated bid price. Delivery lead
times, escalation and exceptions taken will also be considered. The City of Fort Collins
reserves the right to split the bid award in whatever percentages are most
advantageous to the City.
Future orders of Transformers, 75kVA, Submersible, Single Phase with
Overcurrent Protection may be authorized, at the option of the City, from this bid for a
period of five years after bid closing date. Satisfactory pricing and delivery is required
for future orders based on this bid.
EXHIBIT A
BID ACKNOWLEDGEMENT
Contractor hereby acknowledges receipt of the City of Fort Collins Utilities’ Request for
Bids for the Transformers and acknowledges that it has read and agrees to be fully
bound by all of the terms, conditions and other provisions set forth in the Bid.
Additionally, the Contractor hereby makes the following representations to Utilities:
a. All of the statements and representations made in this bid are true to the best of
the Contractor’s knowledge and belief.
b. The Contractor has obtained all necessary authorizations and approvals that will
enable the Contractor to commit to the terms provided in this bid submittal.
c. This bid submittal is a firm and binding offer, for a period of 45 days from the date
hereof.
d. I further agree that the method of award is acceptable to my company.
e. I acknowledge receipt of addenda.
Contractor Firm Name:
Physical Address:
Remit to Address:
Phone:
Authorized Agent of Firm Name:
Signature of Authorized Agent:
Primary Contact for Project:
Title: Email Address:
Phone: Cell Phone:
THE CITY OF FORT COLLINS
UTILITIES
Electric Department
P.O. Box 580
Fort Collins, CO 80522
SPECIFICATION NO: 368-110
TITLE: Single Phase Submersible Transformer
(Rectangular Horizontal Design)
UPDATED BY:
Adam Bromley
Senior Electrical Engineer
APPROVED BY:
Kraig Bader
Standards Engineering Manager
ORIGINATED: June 1999
LAST REVISED: 2 October 2014
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2
368-110
REVISION DESCRIPTIONS
REVISION DESCRIPTION APPROVED
REVISION A
Revised tank material in section 6
Tim Sagen
Bill Bray
12/15/2000
REVISION B
Rewrote specification with reference to IEEE submersible specification C57.12.23.
Overcurrent protection changed:
Secondary breaker in conjunction with under-oil full range current limiting primary
fuse.
Only one thermal design is specified now. Previous revision allowed two thermal
designs, but did not indicate a preference.
Kraig Bader
9/20/2005
Revision C
Corrected stock numbers in Table 1.
Amended paragraph 7.1 -1 to clarify the alloys specified for the construction of the
transformer.
Section 7.4: Removed requirement for tank drain (1.00” NPT flush coupling with
brass pipe plug). Tank drain increases the vulnerability of the tank to rust, and
subsequent leaking in a submersible environment.
Section 7.4: Amended statement regarding lifting eyes – removed requirement for
lifting eyes to be located on ”the front and backside of” the transformer.
Removed statement in paragraph 8 requiring “Bayonet warning decals located near
bayonet fuse.” As design progressed, the decision to use secondary breaker in
conjunction with full range CL fuses removes the need for bayonet warning labels.
Corrected secondary voltage rating in Section 5, Table 1 from 120/240 to 240/120.
(120/240 rated units require 4 LV bushings , and we specify 3 LV bushings.)
Kraig Bader
11/17/05
Revision D
Revised Approved Manufacturer Table to confirm receipt and inspection of
prototype units manufactured in conformance with this specification.
Kraig Bader
4/10/06
Revision E
Revised full-range current limiting fuse sizing in paragraph 6.2 to reflect the derating
from the in-air application to the under-oil application of the Transguard FX fuses.
Kraig Bader
11/28/2006
Revision F
Added the horizontal rectangular tank design to allow transformers to better fit in
oval vaults. Square and rectangular tanks also absorb more of the force of an
internal fault arcing event than round submersibles do, reducing the risk related to
eventful failures.
Kraig Bader
4/9/2009
Revision G
Removed round tank submersibles from the specification
Kraig Bader
1/11/2010
Revision H
Dimensions refined for vault application (length and height maximums reduced)
Moved Magnex interrupter handle to the front panel of the transformer. (Crews are
testing both versions)
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368-110
Revision I
Section 8.3: Reduced maximum tank dimensions for 50 kVA unit in order to reflect
largest acceptable design submitted to Fort Collins Utilities. Currently there are two
submitted designs with acceptable size dimensions.
Section 8.3: Reduced maximum tank dimensions for 75 kVA unit in order to reflect a
recent acceptable design submitted to Fort Collins Utilities.
Section 11: Added requirement for manufacturers to submit loss test data that
specifically includes the expected stray losses of the transformer design and the
corresponding reference temperatures for all loss test data values. The expected
stray losses will be used in transformer efficiency calculations. Added statement
that conductor winding loss test values submitted shall not include transformer
auxiliary devices such as fuses, breakers, and switches.
Section 12: Reduced the minimum opening on 2-way and universal 4-way pallets
from 34” to 30” in order to align with standard pallet sizes. Fort Collins Utilities
previously did not have a forklift that could accommodate the 30” opening.
Adam Bromley
Kraig Bader
7/20/2011
Revision J
Section 7.2: Updated the Magnex Interrupter and ELSP Current Limiting Fuses part
numbers for each size transformer. During an in-depth coordination review of the MI
and CL Fuses recommended by Cooper, it was proposed, and accepted by Cooper
engineers, that a lower amp rating for the CL fuse specified in the 75 kVA unit was
acceptable for our application.
Section 8.1: Changed tank material requirement to 304L SS and added preference
to manufacturing processes that include presses that work SS only. Both of these
revisions are included to help mitigate the corrosion process in a submersible vault
environment.
Section 8.4: Added transformer runner design requirements and associated Figure
3.
Section 10: Added requirement for quoted losses to include approximate stray
losses of the transformer design and losses associated with auxiliary devices.
Section 11.1.2: Added standard Fort Collins Utilities’ requirements for Electronic
Test Reports.
Deleted Individual Transformer Loss Evaluation Form. Typically, orders include
more than one unit and the average form is used. Fort Collins Utilities has always
and continues to reserve the right to calculate losses and assess penalties
individually, if favorable to Fort Collins Utilities.
Adam Bromley
Kraig Bader
9/22/2014
Rev Sym: J
4
368-110
TABLE OF CONTENTS
REVISION DESCRIPTIONS ......................................................................................................................................... 2
1. Scope ........................................................................................................................................................................ 5
2. Applicable Documents .............................................................................................................................................. 5
3. Kilovolt-ampere ratings ............................................................................................................................................. 5
4. Energy Efficiency ...................................................................................................................................................... 5
5. Bushings and Terminals ........................................................................................................................................... 5
5.1 HIGH VOLTAGE TERMINALS ............................................................................................................................ 6
5.2 LOW VOLTAGE TERMINALS ............................................................................................................................ 6
6. Electrical Requirements ............................................................................................................................................ 6
7. Overcurrent protection .............................................................................................................................................. 7
7.1 PRIMARY INTERRUPTER ................................................................................................................................. 7
7.2 FUSING ............................................................................................................................................................... 7
8. TANK DESIGN .......................................................................................................................................................... 7
8.1 TANK MATERIAL ................................................................................................................................................ 7
8.2 TANK THICKNESS ............................................................................................................................................. 7
8.3 TANK DIMENSIONS ........................................................................................................................................... 8
8.4 TANK-MOUNTED ACCESSORIES .................................................................................................................... 8
8.5 TANK COATINGS ............................................................................................................................................... 9
9. Markings ................................................................................................................................................................... 9
10. Losses ..................................................................................................................................................................... 9
11. QUALITY ASSURANCE ......................................................................................................................................... 9
11.1 GENERAL ......................................................................................................................................................... 9
11.1.1 Responsibility for Inspection ....................................................................................................................... 9
11.1.2 Test Report ............................................................................................................................................... 10
11.2 TEST CONDITIONS ....................................................................................................................................... 10
11.2.1 Reference Temperature ........................................................................................................................... 10
11.2.2 Tolerance on Impedance Voltage ............................................................................................................ 10
11.2.3 Tolerance on Impedance Voltage on a Tap ............................................................................................. 10
11.3 TESTS ............................................................................................................................................................. 10
12. Preparation for delivery ......................................................................................................................................... 10
APPENDIX A – Transformer Stock Number Coding .................................................................................................. 11
APPENDIX B – Tank Coating Comparison ................................................................................................................ 12
APPENDIX C – Approved Manufacturers .................................................................................................................. 13
Transformer Loss Evaluation Form- AVERAGE LOSSES ......................................................................................... 14
Special Conditions and Supplemental Instructions to Bidders ................................................................................... 15
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368-110
Specification for Single Phase Submersible Transformer
1. SCOPE
This specification establishes the minimum requirements for single phase, 60 hertz, mineral oil filled, self
cooled, vault type distribution transformers purchased by the City of Fort Collins Electric Department.
Transformers of this design are for installation on an underground power system utilizing separable insulated
connectors and may be installed in underground vaults subject to submersion. The transformer tank and all
external appurtenances shall be of corrosion-resistant material, unless they are otherwise rendered corrosion
resistant.
2. APPLICABLE DOCUMENTS
Unless otherwise stated in this Specification, all transformers shall be new and shall conform to the IEEE
Standard for Submersible Single-Phase Transformers, IEEE C57.12.23 - latest revision. In case of conflict, the
requirements of the following documents shall apply in the priority shown:
This Specification
Referenced IEEE Standards
Approved manufacturers are listed in Appendix C. For purposes of warranty and service, any distributor
bidding must be an authorized distributor appointed by an approved manufacturer to serve the Fort Collins
area. The following IEEE standards for distribution, power, and regulating transformers and shunt reactors form
a part of this Specification:
• General Requirements C57.12.00
• Underground Type Distribution Transformers C57.12.23
• Terminal Marking and Connections C57.12.70
• Terminology C57.12.80
• Test Code C57.12.90
• Appendix to IEEE C57.12.20 C57.91
• Separable Insulated Connectors IEEE 386
3. KILOVOLT-AMPERE RATINGS
Kilovoltampere ratings shall be continuous and based on, but not exceeding, an average winding temperature
rise of 55 ˚C and a hottest-spot temperature rise of 70 ˚C. The temperature rise of the insulating oil shall be
measured near the top of the tank and shall not exceed 55 ˚C.
The kilovoltampere ratings for transformers conforming to this standard shall be suitable for continuous
operation at the rated kilovoltamperes, provided that the temperature of the cooling air (enclosure ambient
temperature) does not exceed 50 ˚C and the average temperature of the cooling air does not exceed 40 ˚C for
any 24-hour period. KVA ratings shall be in accordance with Table-1.
4. ENERGY EFFICIENCY
Transformers shall be designed to meet the minimum energy efficiency ratings defined in the Department of Energy
October 12, 2007 Final Rule: 10 CFR Part 31, Energy Conservation Program for Commercial Equipment:
Distribution Transformers Energy Conservation Standards.
5. BUSHINGS AND TERMINALS
All internal leads and connections, on both high and low voltage, shall be sized to carry full ampere rating,
including overload rating of transformer.
Rev Sym: J
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368-110
5.1. HIGH VOLTAGE TERMINALS
The number and electrical characteristics of the high voltage terminals required are specified in Table 1. High-
voltage bushing wells shall be top-mounted 200A load-break interface bushings rated for 8.3/14.4 kV maximum
continuous voltage, and 95kV BIL and full wave crest voltage in accordance with ANSI/IEEE Standard 386. It
is not required that bushing well inserts be supplied with the transformers.
On phase-to-ground transformers, the H2 end of the high-voltage winding shall be connected to the tank
internally. This connection shall be independent of all other electrical connections.
5.2. LOW VOLTAGE TERMINALS
Terminal type and number shall be in accordance with Table 1 of this specification, and shall be positioned for
additive polarity per IEEE C57.12.23. The low voltage terminals shall have a BIL of 30kV and be singly
mounted on the top of the tank at 5.5 to 7.5 inch center to center spacing.
Terminals shall be welded Central Moloney 5/8” threaded copper stud-type bushings with external epoxy
(Central Moloney Components part # 702822-51). Bushings shall have dimensions in accordance with Figure 1
of this specification, with a bushing sealing surface diameter no greater than 1.38”. All non-metallic
components of the terminals shall be manufactured of a material resistant to ultra-violet degradation. Mounting
hardware shall be corrosion resistant.
Figure 1 – Secondary Bushing Dimensions
The low-voltage neutral (X2) connection of the winding shall be made to the tank or cover but not to the core
clamp. When a fully insulated terminal is used for this low-voltage neutral connection, it shall be externally
identified as being internally connected to the tank or cover.
6. ELECTRICAL REQUIREMENTS
Table 1
STOCK NO.
368-110 –
SERIAL
KVA
% Z
HIGH VOLTAGE LOW VOLTAGE
PROTECTION
TYPE (1)
RATING
TERMINAL(S)
TAPS
RATING
NUMBER AND
TYPE OF
ABOVE BELOW TERMINALS
-130 25 1.77 to 2.16 13200 GRDY/7620 One bushing well None None 240/120 Three CU stud PI & F
-150 50 1.77 to 2.16 13200 GRDY/7620 One bushing well None None 240/120 Three CU stud PI & F
-161 75 1.86 to 2.27 13200 GRDY/7620 One bushing well None None 240/120 Three CU stud PI & F
(1) CP = current-protecting (see section 7, Overcurrent Protection);
S = conventional;
F - Current limiting fuse protection (see section 7, Overcurrent Protection)
TBD = To be Determined
PI = Primary Interrupter
Max. 1.38” dia. Sealing Surface
5/8” Threaded Copper Stud
Rev Sym: J
7
368-110
7. OVERCURRENT PROTECTION
7.1. PRIMARY INTERRUPTER (PI)
A Primary interrupter (PI) mounted on the opposite side of the transformer from the secondary bushings, as
specified in Table 1 shall include:
Cooper Power Systems medium voltage (8.3 kV) Magnex interrupter with indicator and low-oil safety
float specified as follows for the given transformer kVA size:
kVA Magnex Interrupter Part Number
25 MX1AE1SYE06
50 MX1AE1SYE12
75 MX1AE1SYE18
Magnex interrupter hardware kit to include hotstick adaptor and emergency overload capability(Cooper
Power Systems Part # 3638535A08)
Full range, current limiting, under-oil primary fuse (see paragraph 7.2).
7.2. FUSING
Cooper Power Systems internally mounted 8.3kV rated under-oil full range current limiting fuse which shall
operate in conjunction with the Magnex Interrupter specified in Section 7.1:
kVA Current Limiting Fuse
25 ELSP 30 A: Part # CBUC08030C100
50 ELSP 50 A: Part # CBUC08050C100
75 ELSP 80 A: Part # CBUC08080C100
8. TANK DESIGN
8.1. TANK MATERIAL
All portions of the transformer tank (tank, cover, bottom, tank supports, lifting lugs, etc.) shall be manufactured
of 304L stainless steel. During the tank manufacturing process, it is preferred that all stainless steel
working/bending should be done on presses specifically utilized for stainless steel.
8.2. TANK THICKNESS
The tank shall be of sufficient strength to withstand a static internal pressure of 50 kPa gauge (7.25 psig)
without permanent distortion and 140 kPa gauge (20.3 psig) without rupturing.
Rev Sym: J
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368-110
8.3. TANK DIMENSIONS
Figure 2 (shown below) shows the maximum outside tank dimensions for horizontal rectangular-tank designs.
Figure 2 – Tank Dimensions
Maximum Clearance Dimensions (inches)
kVA A B C
25
50
21
21
25.5
25.5
26
28
75 21 28 29
8.4. TANK-MOUNTED ACCESSORIES
The following tank-mounted accessories shall be provided:
(1) Tomco 1720K-1 Or Qualitrol 202-014-02 submersible stainless steel pressure relief device located
on top of the transformer
(1) Tomco LG35 or Harco HLG-1065 1” NPT sight gauge/oil level coupling located on top of the
transformer
(2) ½” - 13 SST ground pads on the side of the tank below primary bushing 7” from top and 7” from
base, respectively to allow for appropriate bonding methods for corrosion control.
(1) Stainless steel pocket type parking stand for a loadbreak stand-off device
o (4) Lifting hooks, welded on the tank near the top, positioned for stable lifting and to allow lifting
strap clearance from the bushings.
(1) Stainless steel top-mounted instruction nameplate
(2) Stainless steel runners mounted on the bottom of the tank made of the same stainless steel alloy as
the tank and shall be as close to flush with the tank edge as possible. Runners shall have a “saw-tooth”
design meeting dimensions shown in Figure 3 in order to increase friction between runners and
transformer supports located inside underground vaults.
All stainless steel accessories shall be of the same grade of steel as the tank material to help mitigate
corrosion.
Figure 3 – Runner Design and Dimensions
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368-110
8.5. TANK COATINGS
An adequate tank coating for underground vault application shall be provided. Appendix B is provided as a
reference for comparing coating requirements. Fort Collins Utilities Electric Department, Engineering Division,
shall be the only authority regarding the adequacy of proposed coatings. The final color shall be ANSI
compliant light gray paint.
9. MARKINGS
X1, X2 & X3 stainless steel identification tags with black lettering
“X2 Int. Gnd” stenciled in black on cover
Cover mounted stainless steel nameplate instruction nameplate conforming to 5.12 of IEEE C57.12.00-
2010, Nameplate A. On the nameplate or a label affixed near it, the manufacturer shall indicate that the
dielectric fluid contains less than 1 ppm PCB.
Temporary serial/shipping card attached to tank lift-eye
10. LOSSES
The total losses of a transformer shall be the sum of the excitation losses and the load losses (I2R losses). Load
loss tests shall be performed and reported on all units regardless of whether or not a record of such tests is
available on duplicate units. Loss evaluations and loss costs will be based on the values shown in the "Special
Conditions and Supplemental Instructions to Bidders." Transformers will be evaluated on excitation losses and I2R
losses at the specified rates. If tested losses exceed quoted losses but are within the tolerances of paragraph 9.3,
IEEE C57.12.00, the additional cost incurred from the differential of losses will be calculated using the following
equation and the above specified rates and will be deducted from the original Purchase Order or back charged to
the manufacturer. In the following equation "Units" shall mean "Transformers of the same size and design on one
order."
Excess loss $ = [# of units] [(No Load Loss Evaluation $) (Avg. No Load Losses - Quoted No Load Losses) + (Load
Loss Evaluation $) (Avg. Load Losses - Quoted Load Losses)]. If this equation results in a negative number, no
credit will be given the Supplier.
If any unit or units exceed the tolerances of paragraph 9.3, IEEE C57.12.00, that unit or units shall not be shipped
without express permission from the City. If accepted, the deduction for excess losses will be based on the
following equation:
Excess loss $ = (No Load Loss Evaluation $) (No Load Losses - Quoted No Load Losses) But Not Less Than Zero
+ (Load Loss Evaluation $) (Load Losses - Quoted Losses) But Not Less Than Zero.
Quoted losses submitted by manufacturers shall include the following:
No load losses
Full load losses – it shall be clearly stated whether this number includes the winding’s expected stray
losses and losses associated with auxiliary devices
Winding’s expected stray losses related to quoted transformer design
Losses associated with auxiliary devices such as fuses, breakers, switches, etc.
All quoted loss values shall be corrected to a reference temperature of 85˚C. Quotations submitted during the bid
process without the required losses information shall be deemed unresponsive and are subject to rejection by the
City of Fort Collins.
11. QUALITY ASSURANCE
11.1. GENERAL
11.1.1. Responsibility for Inspection
Unless otherwise specified, the vendor is responsible for the performance of all inspection requirements
as specified herein. Except as otherwise specified, the vendor may utilize his own facilities or any
Rev Sym: J
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368-110
commercial laboratory acceptable to the City of Fort Collins. The City reserves the right to perform or
witness any of the inspections set forth in this Specification where such inspections are deemed
necessary.
11.1.2. Test Report
The manufacturer shall furnish to the purchaser, prior to payment, electronic reports including
transformer test data as specified in IEEE C57.12.37. Unsigned copies are not acceptable even if
accompanied by a signed cover letter. The manufacturer’s Quality Control Manager shall review and
approve each test report.
The electronic reports shall include the standard data set and the extended data set as specified in
sections 4.2 and 4.3, respectively, of IEEE C57.12.37-2006. At a minimum, these reports shall be
formatted in a comma delimited file as specified in section 5.3 of IEEE C57.12.37-2006; it is preferred
that the comma delimited data be converted to a Microsoft Excel format. These reports shall be sent to
the Material Control Section along with the invoice, and to the Engineering Standards Division via
Electronic Mail (E-mail). E-mail addresses shall be provided to manufacturer upon award of bid.
11.2. TEST CONDITIONS
Unless otherwise specified, testing required by this specification shall be conducted under the following
conditions.
11.2.1. Reference Temperature
The reference temperature to which losses, impedance, regulation, and efficiency are corrected shall be
85°C.
11.2.2. Tolerance on Impedance Voltage
Nominal impedance voltage shall be in accordance with Table 1 of this specification. Completed units may
vary from the specified nominal up to the tolerance specified in IEEE C57.12.00.
11.2.3. Tolerance on Impedance Voltage on a Tap
The percent departure of tested impedance voltage on any tap from tested impedance voltage at rated
voltage shall not be greater than the total tap voltage range expressed as a percentage of the rated
voltage.
11.3. TESTS
The tests to be performed and the test procedures required are specified in IEEE C57.12.00, and C57.12.90.
Exception: impedance and load-loss tests shall be made on each unit and may not be omitted even if a
record of such tests made on a duplicate unit is available.
12. PREPARATION FOR DELIVERY
Transformers shall be prefilled with the appropriate amount of transformer oil and shall be shipped by open-bed
truck. Units shall be packaged in such a way as to provide for ease of handling and to protect units from shipping
damage. Units shall be packaged on two-way pallets or four-way universal pallets with 30 inch minimum opening
(to accommodate minimum fork spacing) and loaded on the truck for side removal. The Supplier shall provide 24-
hour notice prior to delivery for any shipments where an individual transformer weighs over 5,000 pounds. In
addition to these requirements, the Supplier shall comply with any additional requirements or modifications shown
on the purchase order and/or supplemental instructions.
Rev Sym: J
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368-110
APPENDIX A – Transformer Stock Number Coding
Below are examples that demonstrate the coding method used by City of Fort Collins to establish
transformer stock numbers.
I. SINGLE PHASE
Example #1: 368 - 1 BC - X Y Z
II. THREE PHASE
Example #2 368 - 300 - XYZ
Other
KVA
0 = 5 5 = 50
1 = 10 6 = 75
2 = 15 7 = 100
3 = 25 8 = 167
4 = 37.5 9 = 250
1 = single voltage
2 = dual voltage
Transformer Class
00 = 13.2Y/7620 &
7620/13.2Y x
2400/4160 outside
pole
05 = 13.2Y/7620 ESNA
pole or
10 = 13.2Y/7620 ESNA
Submersible
20 = 13.2Y/7620 ESNA pad
Single Phase
Transformer Class
3 Phase
Pad
KVA
006 = 75 075 = 750
015 = 150 100 = 1000
030 = 300 150 = 1500
050 = 500
All suffixes indicate 208Y/120 sec.
For 480Y/277 sec., add 1 to XYZ
(ie. 007 would indicate a 75kVA with
480Y/277 sec.)
Rev Sym: J
12
368-110
APPENDIX B – TANK COATING COMPARISON
This Appendix is not intended to dictate requirements for items purchased under Specification 368-110, but is included
as an aid in comparing coatings for manufacturers attempting to meet the requirements of this design.
Tank coatings listed here are for reference only and shall not be considered as complete. The City of Fort Collins
Utilities shall not be held responsible for patent infringements incurred through the use of this information.
B.1 ARMORTEC, a fusion bonded vinyl resin having a minimum coating thickness of 15 mils.
B.2 Electrostatically applied thermosetting polyester applied as follows:
1. Five Stage Wash - alkaline detergent, water rinse, phosphate treatment, water rinse, and sealing rinse.
2. Delay Line - dry and cool.
3. Coat - Electrostatically coat with a thermosetting polyester.
4. Bake - Heat as recommended by polyester manufacturer to set polyester.
5. Cool.
6. Repeat Process - Repeat applicable steps of above process to obtain a minimum dry build of 6 mils.
B.4 Ceilcote Flakeline 252 (minimum thickness 35 mils).
Rev Sym: J
13
368-110
APPENDIX C – APPROVED MANUFACTURERS
Transformers purchased under this Specification shall be of the make shown below. Manufacturers not listed below
may submit written proposals demonstrating compliance with these Specifications for consideration of addition to the
accepted manufacturer list prior to the next request for bids. In addition to inclusion on the list below, manufacturer's
equipment must also satisfy all requirements of this Specification to be acceptable. Approved manufacturers must
have constructed and submitted prototype units for inspection and deemed satisfactory by the Fort Collins Utilities
Electric Department.
APPROVED MANUFACTURERS
Howard Industries
Central Moloney
The manufacturers in the following list have been conditionally approved and may bid as an alternate. The definition
and intent of "Conditional Approval" of a manufacturer is to allow the Utilities to gain some experience with the
manufacturer's product. Should a conditionally approved manufacturer be the evaluated low bidder, Utilities reserves
the right to award all, part, or none of the order to them, dependant upon the current needs of the Utility for that item or
items.
CONDITIONALLY APPROVED MANUFACTURERS
ABB
Rev Sym: J
14
368-110
TRANSFORMER LOSS EVALUATION FORM- AVERAGE LOSSES
City Order No. S/N
Manufacturer Invoice No.
KVA/Unit
LINE DESCRIPTION AMOUNT
(1) No. of units
(2) Average core losses
(3) Quoted core losses
(4) Excess average core losses:
line (2) less line (3)
(5) Penalty for excess average core losses:
line (1) x line (4) x $
6) Average copper losses
(7) Quoted copper losses
(8) Excess average copper losses:
line (6) less line (7)
(9) Penalty for excess average copper losses:
line (1) x line (8) x $
(10) Penalty to be assessed manufacturer:
line (5) plus line (9) but not less
than zero
Date Prepared By:
Design Engineering
NOTE: If any unit(s) exceeds the loss tolerances of ANSI C57.12.00, Utilities Electric will either
reject it, include it on these averages, or calculate losses using the Individual Transformer Losses
Evaluation Form, whichever is most favorable to Utilities Electric.
Rev Sym: J
15
368-110
SPECIAL CONDITIONS AND SUPPLEMENTAL INSTRUCTIONS TO BIDDERS
Applicable to Specification 368-110
A. Data to be Supplied with Bidder's Proposal
The following data shall be supplied with the bidder's proposal in addition to that information
required by the "Invitation to Bid" and the "Purchase Requisition".
1. Impedance volts in % at full load, high voltage to low voltage at 85°C.
2. No load and total losses at 85°C.
3. Protective tank coating specification.
4. A statement indicating compliance with our Specification without exception.
5. Escalation is , is not applicable for the transformers bid. If escalation applies, the Bidder
shall indicate in his bid the specific items or materials subject to escalation, and shall give the
method and indices to be used in computing the amount thereof. Escalation occurring after the
quoted delivery date will not be paid unless delays are the result of actions by the City. Escalation
occurring after acceptance, if Purchaser exercises the option to delay shipment after manufacturing
is completed, will not be paid.
Failure to supply the above data shall constitute a basis for rejection of the bid.
B. Loss Evaluations
Loss penalties and loss evaluations will be based on the following values:
1. No load or excitation losses at $3.25/watt.
2. Load losses at $1.10/watt.
C. Shipping Terms
Ship F.O.B. point of destination, freight prepaid.
D. Terms of Payment
1. If escalation applies, the City of Fort Collins shall not be billed for escalation occurring after the
promised delivery date. Escalation charges shall be itemized on the invoice.
2. Test reports shall accompany the invoice. If test reports do not accompany the invoice, late
payment penalty charges incurred due to delays in obtaining the test reports will not be paid.
Certified copies of test reports shall be sent to the Design Section, Fort Collins Light and Power
Utility.
3. Loss penalty credits and escalation charges shall be itemized on the invoice.
Removed both of the fill ports on the top of the tank. Will use the site gauge to
remove oil if necessary.
Specified stainless steel runners (skids) to match the stainless alloy of the rest of
the tank.
Secondary bushings moved to the top of the transformer to provide more clearance
in vault.
Kraig Bader
4/29/2010