HomeMy WebLinkAboutBID - 8327 TRANSFORMERS 150KVA THREE PHASE PAD-MOUNTEDINVITATION TO BID
8327 TRANSFORMERS, 150KVA, THREE PHASE, PAD-MOUNTED
BID OPENING: 3:00 P.M. (our clock), June 16, 2016
The City of Fort Collins is requesting bids from firms for 150kVA three phase, pad-mounted
compartmental type, 208Y/120 transformers.
Bid submission via email is preferred. The Bid Spreadsheet shall be submitted in 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), June 16, 2016 and shall be referenced
as Bid No. 8327.
The City encourages all disadvantaged business enterprises to submit bid in response to all
invitations to bid. No individual or business will be discriminated against on the grounds of race,
color, sex, or national origin. It is the City’s policy to create a level playing field on which DBEs
can compete fairly and to ensure nondiscrimination in the award and administration of all
contracts.
Any questions or inquiries regarding this bid should be directed to: Pat Johnson, CPPB, Senior
Buyer at pjohnson@fcgov.com by 4:00 pm June 10, 2016.
A copy of the Bid may be obtained at www.rockymountainbidsystem.com.
The City of Fort Collins is subject to public information laws, which permit access to most
records and documents. Proprietary information in your response must be clearly identified and
will be protected to the extent legally permissible. Proposals may not be marked ‘Proprietary’ in
their entirety. All provisions of any contract resulting from this request for proposal will be
public information.
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 Bids may be withdrawn up to the date and hour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.
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
8327 Transformers 150 kVA 3-Phase Page 1 of 31
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.
Bids must be furnished exclusive of any federal excise tax, wherever applicable.
Bidders must be properly licensed and secure necessary permits wherever applicable.
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.
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.
Gerry S. Paul
Director of Purchasing and Risk Management
8327 Transformers 150 kVA 3-Phase Page 2 of 31
8327 TRANSFORMERS, 150KVA
BID SCHEDULE
WE HEREBY ENTER OUR BID FOR THE CITY OF FORT COLLINS' REQUIREMENTS FOR
8327 TRANSFORMERS, 150KVA, THREE PHASE, PAD-MOUNTED PER THE BID
INVITATION AND ANY REFERENCED SPECIFICATIONS.
QUANTITY: DESCRIPTION:
13 ea. T3000015 TRANSFORMER, 150 kVA PAD-MOUNTED
COMPARTMENTAL TYPE, THREE PHASE DISTRIBUTION
WITH SEPARABLE INSULATED LOAD BREAK HIGH VOLTAGE
CONNECTORS. HIGH VOLTAGE RATING: 13200 GRDY/7620.
LOW VOLTAGE RATING: 208Y/120. SERIAL NUMBER 015 TO
BE IN ACCORDANCE WITH SPECIFICATION #368-300-015,
REVISION PP.
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 150KVA THREE PHASE, PAD-MOUNTED may be authorized, at the option of
the City, from this bid for a period of five years after bid closing date. Satisfactory pricing, losses
and delivery are required for future orders based on this bid.
8327 Transformers 150 kVA 3-Phase Page 3 of 31
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:
8327 Transformers 150 kVA 3-Phase Page 4 of 31
THE CITY OF FORT COLLINS
Light and Power Department
P.O. Box 580
Fort Collins, CO 80522
SPECIFICATION NO: 368-300
TITLE: PAD-MOUNTED COMPARTMENTAL-TYPE,THREE-PHASE
DISTRIBUTION TRANSFORMERS
WITH SEPARABLE
INSULATED LOAD BREAK HIGH-VOLTAGE CONNECTORS
UPDATED BY:
Adam Bromley
Senior Electrical Engineer
APPROVED BY:______________________________________
Kraig Bader
Standards Engineering Division Manager
ORIGINATION DATE: 8/12/83
REVISED: 5/9/2014
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ITEMS COVERED BY THIS SPECIFICATION
DESCRIPTION
STOCK NO.
SPECIFICATION NO. SERIAL
75 KVA, 208Y/120 RADIAL 368-300 -006
75 KVA, 480Y/277 RADIAL 368-300 -007
75 KVA, 208Y/120 LOOP 368-300 -008
75 KVA, 480Y/277 LOOP 368-300 -009
150 KVA, 208Y/120 LOOP 368-300 -015
150 KVA, 480Y/277 LOOP 368-300 -016
300 KVA, 208Y/120 LOOP 368-300 -030
300 KVA, 480Y/277 LOOP 368-300 -031
500 KVA, 208Y/120 LOOP 368-300 -050
500 KVA, 480Y/277 LOOP 368-300 -051
750 KVA, 208Y/120 LOOP 368-300 -075
750 KVA, 480Y/277 LOOP 368-300 -076
1000 KVA, 208Y/120 LOOP 368-300 -100
1000 KVA, 480Y/277 LOOP 368-300 -101
1500 KVA, 480Y/277 LOOP 368-300 -151
2000 KVA, 480Y/277 LOOP 368-300 -201
2500 KVA, 480Y/277 LOOP 368-300 -251
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REVISION DESCRIPTIONS
REVISION DESCRIPTION (Previous on file) APPROVED
REVISION FF:
Add Paragraph 5.2.2.9.3: pentahead locking bolts
Paragraph 3.2.2.13.1: add glossy requirement.
Tim Sagen
Susan Coram
10-18-95
REVISION GG:
Title page: Remove revised date
Paragraph 4.4 and Table 2A: Change Temperature Tests and Noise Test from every
unit to one unit of design.
Susan Coram
Tim Sagen
9-22-95
REVISION HH:
GE removed from Appendix B
Opal Dick
Tim Sagen
12-13-96
REVISION II:
Add paragraph 3.2.2.10 OVERCURRENT PROTECTION and renumber remaining
paragraphs in section 3.2
Revise Fig. 1 to reflect a "V" configuration for the primary bushing arrangement vs. an
in-line arrangement.
Revise Fig. 17 to remove requirement for CT mounting studs and increase dimensions
A from 5" and 5.5" to 6" on 225-2500 kVA sizes
Opal Dick
Tim Sagen
6/3/99
REVISION JJ
Reformat and converted to MS Word, delete List of Active Pages
Bill Bray
Tim Sagen
9 /14 / 2000
REVISION KK
Added drawing 1a to describe cable accessory parking stand detail, revise to reflect
current editions of national standards, change impedance on 368-300-009 from
1.7% to 1.9%.
Kraig Bader
Tim Sagen
9 / 11 / 2001
REVISION LL
Change fusing from oil-immersed current sensing weak link cartridge to a current
sensing bay-o-net fuse link in series with an ELSP current limiting backup
fuse (clause 3.2.2.10).
Change column header for impedance table in 3.2.2.1 to clarify that impedance
numbers are nominal values. (Tolerances are consistent with ANSI C.57.12.00-
2000)
Changed wording from “Mr. Ouch” in 3.2.2.15 to “warning label”
Kraig Bader
4/2/2004
Revision MM
Change clause 3.2.2.10 to specify current sensing bay-o-net fuse link by size and
part number. Table 2 was added for this purpose.
Renamed table in 3.3.2.1 to from Table 2 to Table 3
Renamed table in 4.3. from Table 2A to Table 4
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Added reference to IEEE C57.12.28 – Enclosure Integrity and requirement for an
additional enclosure security design test (See section 3.1.3.2).
Added IEEE C57.12.37 – Electronic Reporting of Distribution Transformer Test Data
as a reference standard. Amended section 5.1.2 to include details for the application
of IEEE C57.12.37.
Changed requirement for operation of compartment doors so that access to the low-
voltage compartment is allowed only after the door to the high-voltage compartment
has been opened in order to reduce hazards associated with arc flash.
Added section on DOE Energy Efficiency Requirements.
Changed Table 1 to include Impedance Tolerances; deleted bushing arrangement
from Table and inserted description and reference in Section 3.2.2.5.3.
Amended section 3.2.2.7.6 to specify a pressure relief device that includes detection
and indication of internal transformer faults. The approved device is manufactured
by IFD Corporation.
Changed Table 3 to include Impedance Tolerances; deleted bushing arrangement
from Table and inserted description and reference in Section 3.3.2.2.
Moved and updated section on Losses (now Section 4) to include new required
information to be submitted by manufacturers during the bid process. Additional
information to be supplied includes expected winding’s stray losses and losses
associated with auxiliary devices such as fuses, breakers, switches, etc. Also
updated Special Conditions and Supplemental Instructions to Bidders with new
required losses information.
Added Central Moloney to the Conditionally Approved Manufacturers list.
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.
Added Special Conditions and Supplemental Instructions to Bidders to the end of
this specification. Previously, this had been submitted to Bidders separately. This
merge helps to maintain consistency among transformer specifications.
Revision PP
Removed requirement for operation of compartment doors so that access to the
low-voltage compartment is allowed only after the door to the high-voltage
compartment has been opened in order to reduce hazards associated with arc flash.
Changed back to previous language to have low-voltage door opened first. New
version of C57.12.34, due to NESC requirements, will alleviate arc flash concerns.
Added requirement for silicon steel cores. Fort Collins is not currently specifying
amorphous core technology at this time, but may entertain amorphous core
proposals when the “No load losses” and “Load Losses” per watt are updated to
reflect the current electric system in Fort Collins.
Added 3.2.2.5.4 to include low-voltage terminal supports on all low-voltage terminals
in order to support cantilever weights that extend out farther than spade connectors
specified in IEEE C57.12.34, Figure 15A.
Updated Figure 1 to clarify the minimum dimensions inside compartment.
Updated Figure 6 to reflect dimensions of transformer pads that are currently being
specified and purchased.
Deleted CT mounting provisions from and added the IFD/PRV to Table 1A –
Accessory Equipment.
Deleted reference to Figure 8 of IEEE C57.12.34-2009 for radial feed transformers.
This reference is out of alignment with our requirement for low voltage bushing
arrangements for loop feed (reference is to Figure 5 of this specification). There is
no reason they should not be the same as we are utilizing the same set-screw
connectors that bolt onto our spade terminals.
Added requirement for tested stray loss value in the “Reserved Space” field to
electronic test data section 5.1.2.
Updated Transformer Pad figures in Appendix A with our current pad specifications.
Adam Bromley
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TABLE OF CONTENTS
ITEMS COVERED BY THIS SPECIFICATION ................................................................................................................................ 2
REVISION DESCRIPTIONS .................................................................................................................................................................
3
1. SCOPE ..................................................................................................................................................................................................
6
2. APPLICABLE DOCUMENTS ........................................................................................................................................................... 6
3. REQUIREMENTS ...............................................................................................................................................................................
6
3.1 GENERAL REQUIREMENTS FOR DESIGN ................................................................................................................................ 6
3.2 SPECIFIC REQUIREMENTS FOR DESIGN OF LOOP -FEED UNITS ........................................................................................ 8
3.3 SPECIFIC REQUIREMENTS FOR DESIGN OF RADIAL -FEED UNITS ................................................................................. 17
4. LOSSES ..............................................................................................................................................................................................
17
5. QUALITY ASSURANCE .................................................................................................................................................................
18
5.1 GENERAL .....................................................................................................................................................................................
18
5.2 TEST CONDITIONS .....................................................................................................................................................................
18
5.3 FUNCTIONAL TESTS ..................................................................................................................................................................
18
5.4 TEST METHODS -- FUNCTIONAL TESTS ................................................................................................................................ 19
6. PREPARATION FOR DELIVERY ................................................................................................................................................. 19
7. DEFINITIONS AND ABBREVIATIONS ....................................................................................................................................... 20
APPENDIX A – TRANSFORMER PAD DESIGNS .......................................................................................................................... 21
APPENDIX B – APPROVED MANUFACTURERS ......................................................................................................................... 25
APPENDIX C – TRANSFORMER LOSS EVALUATION ............................................................................................................... 26
SPECIAL CONDITIONS AND SUPPLEMENTAL INSTRUCTIONS TO BIDDERS APPLICABLE TO SPECIFICATION
368-300 ....................................................................................................................................................................................................
27
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SPECIFICATION FOR
PAD-MOUNTED COMPARTMENTAL-TYPE, THREE-PHASE
DISTRIBUTION TRANSFORMERS WITH
SEPARABLE INSULATED LOAD BREAK HIGH-VOLTAGE CONNECTORS
1. SCOPE
This Specification establishes the minimum electrical requirements and mechanical features of three phase, 60 HZ,
mineral oil immersed, self-cooled, pad-mounted, compartmental-type distribution transformers rated 2500 kVA and
smaller, high voltage 13,200 Grd Y/7620 volts, with separable insulated load break high voltage connectors. These
transformers are used for step down purposes from an underground primary cable supply.
This standard generally conforms to Institute of Electrical and Electronics Engineers (IEEE) requirements for pad-
mounted, compartmental-type, self-cooled, three-phase distribution transformers, 5 MVA and smaller; High Voltage, 34.5
kV nominal system voltage and below; Low Voltage, 15 kV nominal system voltage and below, C57.12.34.
2. APPLICABLE DOCUMENTS
The following documents form a part of this Specification to the extent specified herein. The latest issue in effect on the
date of invitation for bids shall form a part of this Specification, unless otherwise noted.
IEEE C57.12.00 - Standard for General Requirements for Liquid-Immersed Distribution, Power, and Regulating
Transformers
IEEE C57.12.28 – Standard for Pad-Mounted Equipment – Enclosure Integrity
IEEE C57.12.34 – Pad-mounted, compartmental-type, self-cooled, three-phase distribution transformers, 5 MVA
and smaller;, high voltage 34.5 kV nominal system voltage and below; low voltage, 15 kV nominal
system voltage and below
IEEE C57.12.37 – Electronic Reporting of Test Data
IEEE C57.12.70 - Terminal markings and connections for distribution and power transformers
IEEEC57.12.80 - Terminology for power and distribution transformers
IEEE C57.12.90 - Distribution, power, and regulating transformers, and shunt reactors, test code for
IEEE 386 - Separable insulated connectors for power distribution systems above 600V
NEMA STANDARD TR1 - Transformers, regulators and reactors
3. REQUIREMENTS
3.1 GENERAL REQUIREMENTS FOR DESIGN
3.1.1 BASIC DESIGN STANDARDS
Transformers purchased under these Specifications shall be new and, unless otherwise specified, meet the
requirements of the applicable Standards identified herein, and the modifications and additions given in the
subsequent paragraphs. In case of conflict, the requirements of the following documents shall apply in the
priority shown:
a) This Specification.
b) IEEE C57.12.34
c) Other applicable ANSI, IEEE, and NEMA Standards.
3.1.2 KILOVOLT-AMPERE TEMPERATURE RATINGS
Kilovolt-ampere ratings are continuous and are based on not exceeding either a 65°C average winding
temperature or an 80°C hot spot temperature rise. The temperature rise of the insulating oil shall not exceed
65°C when measured near the top of the tank. The temperature rise is based on an altitude of 3,300 feet.
3.1.3 GENERAL CONSTRUCTION
3.1.3.1 Transformers shall conform to IEEE Standard for Pad-Mounted Equipment – Enclosure Integrity,
C57.12.28. The pad-mounted compartmental-type transformers shall consist of the transformer tank,
high-voltage cable terminating compartment, and the low-voltage cable-terminating compartment. All
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three of these components shall be assembled as an integral unit, tamperproof and weatherproof for
mounting on a pad. There shall be no exposed screws, bolts or other fastening devices, which are
externally removable, except the main cover bolts may be exposed. Where the main cover bolts are
exposed, the corner bolts shall be welded or otherwise rendered tamperproof. There shall be no opening
through which foreign objects such as sticks, rods, or wires might be inserted to contact live parts.
Suitable means for padlocking the compartment door(s) shall be provided.
3.1.3.2 In addition to the enclosure security design tests listed in Section 4.3.1 of IEEE C57.12.28, the
manufacturer shall perform an “Operation test”. The unit shall be lifted, utilizing provided lifting lugs, at
least one meter in accordance with the manufacturer’s standard lift instructions and then set again on a
flat surface. The doors shall be easily opened, closed, latched and locked without requiring adjustments
to the cabinet, latch mechanism and/or enclosure door(s). All of the door latch points must fully engage
when the door is closed.
3.1.3.3 The high and low-voltage compartment shall be located side by side on one side of the transformer tank.
When facing the compartment, the low-voltage compartment shall be on the right.
3.1.3.4 Construction of the unit shall be such that it can be lifted, skidded, and slid into place on the mounting pad
without disturbing the entrance cables.
3.1.3.5 An undercoating over the regular finish or an equivalent treatment shall be applied to all surfaces that are
in contact with the pad to minimize corrosion.
3.1.3.6 Minimum dimensions shall be as shown in Fig. 1 of this Specification. Maximum transformer and
minimum pad dimensions are shown in Fig. 6 of this Specification.
3.1.4 ENERGY EFFICIENCY
Transformers shall be designed to meet the minimum energy efficiency ratings defined in the United States
Department of Energy October 12, 2007 Final Rule: 10 CFR Part 31, Energy Conservation Program for
Commercial Equipment: Distribution Transformers Energy Conservation Standards.
3.1.5 SERVICE CONDITIONS
Service conditions shall be as defined in paragraph 4.1 of IEEE C57.12.00 except the ambient temperature
range shall be 40°C above to 32°C below zero. The transformer shall operate safely with starting temperatures
as low as 32°C below zero.
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3.2 SPECIFIC REQUIREMENTS FOR DESIGN OF LOOP -FEED Units
3.2.1 FUNCTIONAL DESCRIPTION
The transformer shall be a three phase, pad mounted, loop feed-safe break, “deadfront” type for use on a 13.2
kV grounded “Y” distribution system.
3.2.2 DESIGN AND CONSTRUCTION
3.2.2.1 RATINGS
Table 1 - Loop-Feed Transformer Ratings
Stock No. kVA Low
Voltage
Nominal
Impedance
Impedance Tolerance1
Minimum Maximum
368-300- 008 75 208Y/120 1.9% 1.71% 2.09%
368-300- 009 75 480Y/277 1.9% 1.53% 1.87%
368-300- 015 150 208Y/120 2.1% 1.89% 2.31%
368-300- 016 150 480Y/277 2.1% 1.89% 2.31%
368-300- 030 300 208Y/120 2.5% 2.25% 2.75%
368-300- 031 300 480Y/277 2.5% 2.25% 2.75%
368-300- 050 500 208Y/120 3.04% 2.81% 3.27%
368-300- 051 500 480Y/277 3.04% 2.81% 3.27%
368-300- 075 750 208Y/120 5.75% 5.32% 6.18%
368-300- 076 750 480Y/277 5.75% 5.32% 6.18%
368-300- 100 1000 208Y/120 5.75% 5.32% 6.18%
368-300- 101 1000 480Y/277 5.75% 5.32% 6.18%
368-300- 151 1500 480Y/277 5.75% 5.32% 6.18%
368-300- 201 2000 480Y/277 5.75% 5.32% 6.18%
368-300- 251 2500 480Y/277 5.75% 5.32% 6.18%
1
Tolerances for impedance voltage shall be consistent with requirements in section 9.2 of IEEE C57.12.00-2010.
3.2.2.2 INSULATION LEVEL
3.2.2.2.1 The basic impulse level (BIL) of the completely assembled transformer, including high-voltage and
low-voltage terminals shall be 95 kV and 30 kV respectively.
3.2.2.2.2 Dielectric test levels shall be in accordance with the distribution levels in Section 5.10 of IEEE
C57.12.00-2010.
3.2.2.2.3 The unit shall withstand test voltages in accordance with IEEE C57.12.00 and impulse tests in
accordance with NEMA Standards for Transformers, Publications No. TR1.
3.2.2.3 TRANSFORMER CORE
3.2.2.3.1 A five-legged core-coil assembly or three separate core-coil assemblies shall be employed. The use
of three-legged designs is expressly prohibited.
3.2.2.3.2 The transformer core material shall be constructed with a silicon steel material. All core materials
that do not meet that requirement shall be specifically approved in writing by Fort Collins Utilities
Engineering Standards Division.
3.2.2.4 HIGH VOLTAGE TAPS
A no-load tap changer with external operating handle shall provide two 2 ½ full capacity taps above and
below normal. The operating handle shall be mounted in the primary compartment.
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3.2.2.5 BUSHING WELLS AND TERMINALS
3.2.2.5.1 The number, location, and arrangement of bushing wells, terminals and parking stands shall be as
shown in Fig. 1 and Fig. 5 of this specification. All low-voltage bushings and high-voltage wells
shall be externally clamped and shall have leads of sufficient length to allow them to be changed
without removing the cover. Welded bushings and wells are expressly prohibited.
3.2.2.5.2 High-voltage bushing wells shall be compatible with 200A load-break interface 8.3/14.4 kV bushings
well inserts in accordance with IEEE Std. 386. It is not required that the bushing well insert be
supplied with the transformer.
3.2.2.5.3 Low voltage bushing arrangement and spacing shall be “staggered”, as shown in Fig. 5 of this
Specification. Transformers 500 kVA and smaller shall have low voltage terminals meeting the
requirements contained in Figure 15B of IEEE C57.12.34-2009; there shall also be a separate
spade included that meets requirements for the respective size of transformer contained in Figure
15A of IEEE C57.12.34-2009. Transformers larger than 500 kVA shall have low voltage terminals
meeting the requirements contained in Figure 15A of IEEE C57.12.34-2009.
3.2.2.5.4 In addition to the low-voltage terminal requirements in 3.2.2.5.3, all low voltage terminals equipped
with spades shall be furnished with additional support. A manufacturer designed support shall be
attached at the end that is the farthest from the tank wall and mounted in such a way that it will not
interfere with the use of any of the holes of the spade or protrude beyond the width of the spade
that would interfere with set-screw connectors attached to and extending beyond the length of the
spade.
3.2.2.5.5 The low-voltage neutral shall be a fully insulated bushing. A ground pad shall be provided on the
outer surface of the tank and a removable copper ground strap shall be provided and connected
between the low-voltage neutral bushing and the ground pad.
3.2.2.5.6 The high-voltage neutral shall be connected to the low-voltage neutral internally with provision for
opening this connection for testing.
3.2.2.6 ACCESSORY CABINET
3.2.2.6.1 The accessory cabinet shall consist of a high-voltage and low- voltage compartment generally
constructed in accordance with applicable IEEE specifications and dimensioned in accordance with
Fig. 1 of this Specification.
3.2.2.6.2 Cabinet doors shall be hinged, removable, and lockable. Stainless steel hinge pins shall be
provided.
3.2.2.7 ACCESSORY EQUIPMENT
Accessory equipment shall be provided in accordance with Table 1A and the following details:
3.2.2.7.1 Suitable jack bosses or equivalent jacking facilities shall be provided on the tank. Vertical clearance
for a jack shall be 1½ inches minimum, 3½ inches maximum.
3.2.2.7.2 The transformer base shall be arranged for rolling in two directions:
Parallel to and at right angles to the centerline of the high-voltage bushings.
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3.2.2.7.3 Four lifting lugs shall be provided. These lugs shall be adequate strength and size and arranged on
the tank to provide a suitable lift for the completely assembled unit.
3.2.2.7.4 The base of the assembly shall be provided with suitable means for mounting the unit on the pad.
An internal flange shall be provided at the base of the accessory compartment to provide means for
mounting the unit on the pad (Fig. 1).
3.2.2.7.5 Terminal designations are shown in Figure 1. The identification of terminal connections shall be
shown on the instruction nameplate. Instruction nameplate shall be corrosion resistant, located in
the high-voltage compartment, and shall be readable with cables in place. Where the nameplate is
mounted on a removable part, the manufacturer’s name and transformer serial number shall be
permanently affixed to a non-removable part.
Instruction nameplate shall contain the information specified in IEEE C57.12.00-2010, paragraph
5.12. In addition, either on the nameplate or label affixed near it, the manufacturer shall indicate that
the dielectric fluid is non-PCB.
3.2.2.7.6 A non-resettable device which detects and provides external indication of internal transformer faults,
as well as incorporating automatic pressure relief functionality shall be provided. The pressure
relief device shall meet the following requirements:
¼” NPT or larger male Inlet Port.
Exposed parts of weather and corrosion resistant materials.
Non-deteriorating gasket and o-ring material.
Manual pull ring able to withstand a static force of 25 pounds for 1 minute without permanent
deformation. The valve shall also withstand for 1 minute a static force of 100 lbf applied normal
to its longitudinal axis at the outermost extremity of the body.
Bug shield to prevent entry of dust, moisture, and insects before and after the valve has
operated.
Cracking pressure of 10 ± 2 psig.
Resealing pressure of 6 psig minimum.
Zero leakage from resealing pressure to –8 psig.
Minimum flow rate of 35 SCFM at 15 psig.
The approved manufacturer for this device is IFD Corporation. Other devices meeting the
requirements defined in this specification shall be specifically approved in writing by Fort Collins
Utilities Engineering Standards Division.
3.2.2.8 OIL PRESERVATION
Transformers shall be of sealed-tank construction. Sealed-tank construction is that which seals the interior
of the tank from the atmosphere, and in which the gas plus the oil volume remains constant. The
transformer will remain effectively sealed for a top-oil temperature range of –32°C to 105°C.
3.2.2.9 TANKS
The tank shall be domed or sloped to shed water and shall be of sufficient strength to support a minimum of
500 lbs. Construction of the tank shall be in accordance with IEEE C57.12.34-2009, Section 8.10, except
that a bolted cover is preferred.
3.2.2.9.1 If main cover is welded, adequate handhole(s) shall be provided. Handholes shall be concealed.
Bolted-on covers shall be adequately gasketed and tamperproof. Main cover bolts may be
exposed; however, where cover bolts are exposed, the corner bolts shall be welded or otherwise
rendered tamperproof.
3.2.2.9.2 Tank grounding provision shall be in accordance with Section 8.11 of IEEE C57.12.34-2009.
3.2.2.9.3 Locking bolts shall be pentahead style.
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3.2.2.10 OVERCURRENT PROTECTION
Overcurrent protection shall consist of a single element current sensing bay-o-net fuse link in series with an
ELSP current limiting backup fuse. Fuses shall be sized as shown in Table 2:
Table 2 – Fusing Requirements
Stock
Number
kVA
Capacity
Expulsion Fuse Continuous
Current Rating
(Part Number*)
Current Limiting Fuse
Continuous Current Rating
(Part Number*)
368-300-008
368-300-009
75kVA 10A
(4000353C06)
30A
3544030M61M
368-300-015
368-300-016
150kVA 15A
(4000353C08)
40A
(3544040M61M)
368-300-030
368-300-031
300kVA 25A
(4000353C10)
65A
(3544065M61M)
368-300-050
368-300-051
500kVA 40A
(4000353C12)
100A
(3544100M71M)
368-300-075
368-300-076
368-300-100
368-300-101
750kVA
750kVA
1000kVA
1000kVA
65A
(4000353C14)
125A
(3544125M71M)
368-300-151
368-300-201
1500kVA
2000kVA
140A
(4000353C17)
250A : Parallel 125A fuses
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Figure 1 - Accessory compartment & Bushing Dimensions (Config. 1)
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Figure 1A – Cable Accessory Parking Stand Detail
Figure 2 (Config. 2) - DELETED 7/92
Figures 3 & 4 - DELETED 11/00
Ref. now to: 3.2.2.5.3 and 3.2.2.5.4 of this
Specification
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4.0"
MIN
B
6" RADIUS
TYPICAL 3
PLACES
4.0"
MIN
A
Figure 5 - Staggered Low - Voltage Bushing Arrangement
(all dimensions minimum inches).
NOTE:
An area having a 6 inch radius around each bushing
shall remain clear of obstructions such as gauges, etc.
8
10
6
480/277, 208Y/120 6
ALL
750-2500
225-500
75-150
LOW VOLTAGE A B
RATINGS
KVA RATINGS
AA
4.75 8
ALL
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KVA
SERIAL
PAD DIMENSIONS (inches)
A B C D E F
75 -006 thru –009 79 56 52 22 16 65.5
150 -015 79 56 52 22 16 65.5
150 -016 79 56 52 22 16 65.5
300 -030 79 56 52 22 16 65.5
300 -031 79 56 52 22 16 65.5
500 -050 79 56 52 22 16 65.5
500 -051 79 56 52 22 16 65.5
750 -076, -075 84 73 52 22 16 68
1000 -101, -100 84 73 52 22 16 68
1500 -151 107 88 52 22 16 79.5
2000 -201 107 88 52 22 16 79.5
2500 -251 107 88 52 22 16 79.5
Fig. 6 – Pad Dimensions
A
B
E
D
C
F
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TABLE 1A
ACCESSORY EQUIPMENT
ACCESSORY
KVA
75-150 300 500-2500
Tap changer handle in HV compartment X X X
Instruction nameplate in LV compartment X X X
Jacking provisions X X X
Provisions for rolling in two directions X X X
Lifting lugs X X X
Provisions for mounting on pad X X X
Arrester mounting provisions
Grounding provisions in both compartments X X X
1” oil drain plug X
1” oil drain valve with sampling device
X X
Upper filter press and filling plug (or cap) (1”) X X X
Provisions for oil gauge X
Provisions for pressure-vacuum gauge X X
Oil gauge X
Thermometer X X X
Internal Fault Detector (IFD) with manual/
automatic pressure relief valve. See section
3.2.2.7.6.
X X X
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3.3 SPECIFIC REQUIREMENTS FOR DESIGN OF RADIAL -FEED Units
3.3.1 FUNCTIONAL DESCRIPTION
The transformer shall be a three phase, pad mounted, radial feed safe break, “deadfront” type for use on a 13.2
kV grounded “Y” distribution system.
3.3.2 DESIGN AND CONSTRUCTION
The requirements for radial-feed transformers shall be the same as those of loop-feed with the following
exceptions:
3.3.2.1 RATINGS
Table 3 - Radial-Feed Transformer Ratings
Stock No. kVA Low
Voltage
Nominal
Impedance
Impedance Tolerance1
Minimum Maximum
368-300- 006 75 208Y/120 1.9% 1.71% 2.09%
368-300- 007 75 480Y/277 1.9% 1.71% 2.09%
1. Tolerances for impedance voltage shall be consistent with requirements in section 9.2 of IEEE C57.12.00-2010.
3.3.2.2 BUSHING WELLS AND TERMINALS
The number, location, and arrangement of bushing wells, terminals and parking stands shall be as shown
in Figures 12 and 13A of IEEE C57.12.34-2009. EXCEPTION: high voltage bushings shall be 32 - 36
inches above the base of the transformer.
4. 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 C57.12.00-2010, 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 $ = [No. 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 C57.12.00-2010, 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:
Core material type
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.
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5. QUALITY ASSURANCE
5.1 GENERAL
5.1.1 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 commercial
laboratory acceptable to the City of Fort Collins Utilities. The City reserves the right to perform or witness any of
the inspections set forth in this Specification where such inspections are deemed necessary.
5.1.2 TEST REPORT
The manufacturer shall furnish to the purchaser, prior to payment, certified copies of the results of all tests as
well as electronic reports including transformer test data as specified in IEEE C57.12.37. Unsigned copies of
the certified test reports 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. If the manufacturer performs resistance testing that yields a
tested stray loss value, this value shall be reported in the “Reserved Space” field specified in section 4.3.12 of
IEEE C57.12.37-2006. These reports shall be formatted in a comma delimited file as specified in section 5.3 of
IEEE C57.12.37-2006. These reports shall be sent to the Material Control Section along with the invoice, and to
Engineering Standards Division via Electronic Mail (E-mail). E-mail addresses shall be provided to
manufacturer upon award of bid.
5.2 TEST CONDITIONS
Unless otherwise specified, testing defined in Section 4.6 shall be conducted under the following conditions:
5.2.1 REFERENCE TEMPERATURE
The reference temperature to which losses, impedance, regulation, and efficiency are corrected shall be 85° C.
5.2.2 TOLERANCE ON IMPEDANCE VOLTAGE
Tolerance shall be as specified in Tables 1 and 3.
5.2.3 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.
5.3 FUNCTIONAL TESTS
Functional tests shall consist of those tests and related requirements as cross referenced in Table 4 and shall be
performed on each unit, except Temperature and Noise Tests which shall be performed on one unit of each design
(KVA) per order.
Table 4 - Functional Tests
TEST TEST PARAGRAPH REQUIREMENT OR REFERENCE
Examination Of Product 4.6 3.0, 3.1, 3.2, 3.3 (This specification)
Ratio 4.6 IEEE C57.12.00 Section 8
Polarity And Phase Relation 4.6 IEEE C57.12.00 Section 8
Excitation Loss 4.6 IEEE C57.12.00 Section 8
Excitation Current 4.6 IEEE C57.12.00 Section 8
Impedance & Load Loss 4.6 IEEE C57.12.00 Section 8
Temperature Tests* 4.6 IEEE C57.12.00 Section 8
Dielectric Tests 4.6.1 3.2.2.2 (This specification)
Impulse Tests 4.6.2 3.2.2.2 (This specification)
Leak Testing 4.6.3 3.2.2.8 & 3.2.2.9 (This specification)
Noise Testing* 4.6.4 3.2.2.12 (This specification)
*One unit per design per order.
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5.4 TEST METHODS -- FUNCTIONAL TESTS
Each completed unit shall be inspected to determine compliance with respect to dimensions, material,
workmanship, construction and marking, and routine tests on all units shall be made as specified in Section 8 of
IEEE Standard C57.12.00, and in IEEE Standard C57.12.90. In addition to routine tests, the following test
requirements and/or modifications shall apply.
5.4.1 DIELECTRIC TESTS
Induced and applied potential Dielectric Tests shall be performed in accordance with IEEE C57.12.00 and
C57.12.90. The low voltage windings shall have a test potential to ground of 10,000 volts for one minute. The
test potential between high voltage windings shall be 34,000 volts for one minute.
5.4.2 IMPULSE TESTS
IEEE Standard Impulse Tests shall be performed. Full Wave Impulse Test shall use a 1.5 x 50 microsecond
wave.
5.4.3 LEAK TESTING
The transformer tank shall be filled with oil and tested for air and oil leaks under (1) 4 psig vacuum for ½ hour,
(2) 7 psig pressure for 24 hours in the sequence indicated. An alternate method of leak testing may be
performed by injecting halogen gas under 10 psig and detecting leaks through the use of a halogen detector.
(Note, the automatic/manual pressure relief device must be removed for this test).
5.4.4 NOISE TESTING
Noise testing shall be conducted in accordance with applicable NEMA Standards.
6. 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
fully palletized in two-way pallets or four-way universal pallets with 30" minimum openings (to accommodate minimum fork
spacing) and loaded on the truck for side removal. Pallets shall be independent of the transformer. The Supplier shall give
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.
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7. DEFINITIONS AND ABBREVIATIONS
Vendor or Supplier - The manufacturer and/or manufacturer's agent supplying or quoting on the specified article.
Article, Unit, Assembly - All refers to the equipment defined by this specification.
DC or d.c. - Direct Current.
AC or a.c. - Alternating Current.
°C - Degree Celsius (Centigrade)
°F - Degree Fahrenheit
kV - 1000 volts.
CPS or Hz - Cycles per second.
psig - Pounds per square inch gauge.
V or v - Volts.
kVA - 1000 Volt-amperes.
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APPENDIX A – Transformer Pad Designs
Transformer Pad Specifications are shown in Figures 1A through 3A and correspond to Fort Collins Utilities specifications
368-400-01, 368-400-02, and 368-400-03 respectively.
The dimensions in inches of Figures 1A through 3A will fit the minimum compartments on transformers covered by this
Specification as well as the maximum transformer envelope.
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Figure 1A - Pad Design (75 - 500 KVA)
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Figure 2A - Pad Design (750 - 1000 KVA)
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Figure 3A - Pad Design (1500-2500 KVA)
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APPENDIX B – 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
Cooper Power Systems
ASEA Brown-Bovari (ABB)
Howard Industries
CG Power Systems
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 City to gain some experience with the manufacturer's product.
In order to be added to the Conditionally Approved List, the manufacturer shall submit drawings demonstrating that their
design meets technical and dimensional requirements contained within this Specification. Should a conditionally approved
manufacturer be the evaluated low bidder, the City reserves the right to award all, part, or none of the order to them,
dependant upon the current needs of the City for that item or items.
CONDITIONALLY APPROVED MANUFACTURERS
Central Moloney
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APPENDIX C – Transformer Loss Evaluation
TRANSFORMER LOSS EVALUATION - 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 IEEE C57.12.00, Utilities Electric Department will (1) either reject it, (2)
include it on these averages, or (3) calculate losses and assess penalties individually, whichever is most favorable to
Utilities Electric Department.
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Special Conditions and Supplemental Instructions to Bidders
Applicable to Specification 368-300
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 percent (%) at full load, high voltage to low voltage at 85°C
2. No load losses, full load losses, total losses, expected winding’s stray losses, auxiliary devices’ losses all
corrected to a reference of 85°C. Please see Section 4 – Losses for more information.
3. Delivery in weeks
4. A statement indicating compliance with our Specification with exception or a detailed list of exceptions.
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 provide the method and
indices to be used in computing the amount thereof. Escalation occurring after acceptance, if Purchaser
exercises the option to delay shipment after manufacturing is completed, will not be paid.
If the above information and compliance statement are not supplied the proposal will not be evaluated
An alternate bid for the total order may be submitted in addition to the unit bids.
B. Loss Evaluations
Loss penalties and loss evaluations will be based on the following values:
1. No-load or excitation losses at $3.90/watt
2. Load losses at $2.30/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.
2. Electronic test reports as describe in Section 5.1.2 sent via E-mail shall accompany the invoice sent to the
Material Control Section. 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. Electronic test reports shall also be sent via E-mail to
Engineering Standards Division, Fort Collins Utilities - Light & Power.
3. Loss penalty credits and escalation charges shall be itemized on the invoice.
8327 Transformers 150 kVA 3-Phase Page 31 of 31
(3544125M71M)
368-300-251 2500kVA 125A Hi-Amp OL Link C05CB 3 250A : Parallel 125A fuses
(3544125M71M)
* Fuse shall be as specified in the table above or shall be an equivalent as approved in
writing by Electric Standards Engineering.
3.2.2.11 COMPONENTS FOR LOOPED PRIMARY
The minimum current-carrying capability of components for the looped primary cable system shall be 200
amperes (continuous) and 10,000 amperes symmetrical (momentary).
3.2.2.12 AUDIBLE SOUND LEVEL
The audible sound level shall be in accordance with NEMA Standard TR1.
3.2.2.13 BASE PLAN
The base plan of a completely assembled unit shall be such that it can be installed on a pad of the
dimensions shown in Fig. 6 of this specification.
3.2.2.14 PAINT
3.2.2.14.1 Surfaces to be painted shall be blast cleaned (commercial blast) to provide a clean dry surface free
of dirt, dust, chalk, loose paint, rust, grease and any other contaminants.
3.2.2.14.2 EEI “Finishing Guidelines” specification shall apply. Finish coat shall be Desert Tan, Munsell
#10YR6.0/3.0, glossy.
3.2.2.15 SAFETY LABELS
The manufacturer shall not apply NEMA 260 Safety Labels. The Purchaser will apply custom warning labels
after delivery.
3.2.2.16 ANGULAR DISPLACEMENT:
Per Figure 16(b) of IEEE C57.12.34-2009.
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Kraig Bader
8 May 2014
8327 Transformers 150 kVA 3-Phase Page 8 of 31
Kraig Bader
2/2/2005
Revision NN
Change clause 3.2.2.5 to better clarify that the transformer manufacture need only
provide bushing wells that are compatible with IEEE 386 bushing well inserts, not
the inserts themselves.
Kraig Bader
24 August 2010
Revision OO
Updated all references from ANSI to IEEE standards. The standards development
process utilized by IEEE is approved by ANSI, so they do not explicitly place their
name on each IEEE standard anymore.
Updated references to IEEE C57.12.26, which is no longer active, to now reference
IEEE C57.12.34 and the corresponding sections and figures within the new
standard.
Adam Bromley
Kraig Bader
2 April 2013
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