Resolution No. 7690L , s
I RESOLUTION NO. 7690
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A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
3 VERNON APPROVING AND AUTHORIZING NOTICE INVITING
SEALED PROPOSALS OR BIDS FOR THE PURCHASE OF SIX
4 66KV CIRCUIT BREAKERS TO REPLACE THE EXISTING ONES
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6 WHEREAS, the Utilities Department is requesting that the City
7 purchase six (6) 66kV Outdoor Circuit Breakers to replace the existing
8 breakers at the Vernon and Leonis Substations; and
9 WHEREAS, the existing 66kV circuit breakers are approximately
10 40 to 70 years old, are oil filled, maintenance intensive, and costly
11 to maintain; and
12 WHEREAS, the new circuit breakers are expected to be
13 mechanically better than the existing circuit breakers and will
14 require minimal maintenance; and
15 WHEREAS, on January 16, 2001, the Finance Committee approved
16 the recommendation of Bruce V. Malkenhorst, the Director of Finance,
17 dated January 9, 2001, that authority be granted for the Purchasing
18 Agent, or his designee, to seek formal bids for the purchase of six
19 (6) 66kV Circuit Breakers to replace the existing circuit breakers at
20 an approximate cost of Two Hundred Forty Thousand Dollars and No Cents
21 ($240,000.00); and
22 WHEREAS, a Specification No. ST-CB-1-2000 has been prepared
23 for the purchase of the six (6) 66kV Circuit Breakers; and
24 WHEREAS, the City Council of the City of Vernon has
25 determined that it is in the best interests of the City of Vernon that
26 bids or proposals be solicited in accordance with applicable State law
27 and the Vernon City Code.
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I NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE
2 CITY OF VERNON AS FOLLOWS:
3 SECTION 1: The City Council of the City of Vernon hereby
4 finds and determines that the recitals contained hereinabove are true
5 and correct.
6 SECTION 2: The Specification No. ST-CB-1-2000, a copy of
7 which is attached hereto and made a part hereof as Exhibit "A," is
8 hereby approved by the City Council of the City of Vernon.
9 SECTION 3: The City Clerk of the City of Vernon is hereby
10 directed to give notice, in writing, inviting sealed proposals or bids
11 for the purchase of the six (6) 66kV Circuit Breakers in accordance
12 with the Specification, and in accordance with this resolution.
13 SECTION 4: There being no newspaper of general circulation
14 printed, published or circulated in the City of Vernon, the City Clerk
15 is hereby directed to post said notice, or cause the same to be
16 posted, in three of the most public places in the City of Vernon, to
17 wit: the northwest corner of 38th Street and Santa Fe Avenue, the
18 northeast corner of Leonis Boulevard and Pacific Boulevard, and on the
19 bulletin board in the lobby of the City Hall of the City of Vernon,
20 located at 4305 Santa Fe Avenue, in said City.
21 SECTION 5: The City Clerk of the City of Vernon is hereby
22 directed to post said notice forthwith and the first posting of said
23 notice shall be at least ten (10) days before the opening of the bids
24 for the proposed contract. Said notice shall provide that sealed
25 proposals or bids will be received by the City of Vernon at the office
26 of the City Clerk, or his designee, at the City Hall, 4305 Santa Fe
27 Avenue, Vernon, CA 90058-0805.
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I SECTION 6: The City Clerk of t
2 certify to the passage of this resoluti<
3 thereafter the same shall be in full for
4 APPROVED AND ADOPTED this 17th c
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ATTEST-
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8 BRUCE V. MALKENHORST, City Clerk
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STATE OF CALIFORNIA
COUNTY OF LOS ANGELES
ss
I, BRUCE V. MALKENHORST, City Clerk of the City of Vernon, do
hereby certify that the foregoing Resolution, being Resolution No.
7690, was duly adopted by the City Council of the City of Vernon at an
adjourned regular meeting of the City Council duly held on Wednesday,
January 17, 2001, and thereafter was duly signed by the Mayor of the
City of Vernon.
BRUCE V. MALKENHORST, City Clerk
(SEAL)
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EXHIBIT
AV
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SPECIFICATION NO. ST-CB-1-2000
72.5 kV DEAD TANK
THREE-PHASE, 60 Hz
SF6
POWER CIRCUIT BREAKER
CITY OF VERNON
LIGHT AND POWER
DEPARTMENT
December 12, 2000
I SPECIFICATION NO. ST-CB-1-2000
1.0 SCOPE
This specification covers the requirements for the design, construction, and performance
for three-phase, 60 Hz, 72.5 kV, outdoor, substation type, vacuum or SF6 Gas power
circuit breakers. The manufacturer shall follow good engineering and manufacturing
practices necessary to produce a power circuit breaker that shall provide safe and reliable
service in an electric power system application.
2.0 GENERAL
The circuit breaker covered in this specification shall be designed, manufactured, and
tested in accordance with the latest revisions of the following standards that apply to
power circuit breakers and appurtenances:
1. ANSI/IEEE C37.04 through C37.011, AC High -Voltage Circuit Breakers
2. ANSMEEE C37.081, Guide for Synthetic Fault Testing of AC High -Voltage
Circuit Breakers Rated on a Symmetrical Current Basis
3. ANSIMEE C37.082, Standard Methods for the Measurement of Sound Pressure
Levels of AC Power Circuit Breakers
4. ANSI C37.11, Standard Requirements for AC High -Voltage Circuit Breakers
Rated on a Symmetrical Current Basis or a Total Current Basis
5. ANSMEE C37.13, Standard Requirements for Instrument Transformers
6. ANSI C76.1 and ANSI C76.2, Outdoor Apparatus Bushings
7. American Society of Mechanical Engineering
8. American Society for Testing Materials
9. National Electric Manufacturers Association
10. National Electrical Safety Code
11. National Electric Code
1 Specification No. ST-CB-1.2000
3.0 DEVIATION AND NON-CONFORMANCE -REQUIREMENT
3.1 Omission or error in this or the manufacturer's specification of an item of material
or equipment necessary for the operation and matching of the offered equipment
in conjunction with the other equipment, existing and future, shall not excuse the
bidder from responsibility in this matter.
3.2 Deviation from this specification or changes in the material or design after
purchase order has been placed must be approved by the City's Electrical
Engineering Manager or his designated representative, and acknowledged by an
addendum to the specification which shall be issued as a Purchase Change Order.
3.3 Units received with deviations or changes which are not approved or
acknowledged by the City's Electrical Engineering Manager, or his designated
representative are subject to rejection. The supplier of units rejected is
responsible for any corrective action including but not limited to make the units
conform to this specification.
3.4 Units with defects, discovered before or after installation, that are believed to be
inherent to manufacturing problems or workmanship shall be rejected.
4.0 INSTRUCTION TO BIDDERS
4.1 The bidder shall submit the proposal in accordance with the City's Notice Inviting
Sealed Proposals.
4.2 The bidder shall complete and submit with his proposal, Bidder's Data Sheet.
The bidder shall guarantee all information submitted in the Bidder's Data Sheet as
correct.
4.3 The bidder shall supply proposal information that shall include the complete
design and construction details and is truly representative of any equipment to be
furnished.
4.4 Any exceptions to be taken by the bidder to this specification shall be set forth
clearly by written attachment by the bidder in his proposal.
4.5 The successful bidder shall submit all drawings and diagrams in complying with
the specification to the City for approval within ten (10) weeks after bid award.
The bidder's schedule shall include the time for transmittal of drawings for
approval in addition to a minimum of ten (10) working days for review by the
City. Revisions of the drawings to make them comply with the specifications
shall be at the bidder's expense and without extension of the completion date.
2 Specification No. ST-CB-1-2000
4.6 Each drawing supplied by the bidder shall bear identification showing the City's
purchase order number, date of the drawing release, and whether the drawing is
for approval or approved for construction.
4.7 Shipping and storage shall be accomplished in such a manner as to prevent
damage or deterioration of materials.
5.0 RATINGS
The circuit breaker shall be rated as shown below, as defined in ANSI/IEEE C37.04, AC
High -Voltage Circuit Breakers Rated on a Symmetrical Current Basis, and as listed in
ANSMEE C37.06, Preferred Ratings and Related Required Capabilities for AC High -
Voltage Circuit Breakers Rated on a Symmetrical Current Basis.
1. Maximum Operating Voltage: 72.5 kV
2. Continuous Current: 1200 Amps
3. Basic Impulse Level (BIL): 350 kV
4. Symmetrical Short Circuit Interrupting Current: 31.5 KA
5. Rated Interrupting Time: 5 cycles, maximum
6. Minimum Creepage Distance of External Insulation to Ground: 42"
7. Operating Voltages:
Trip Coil Operating Voltage: 125 Vdc
Close Coil Operating Voltage: 125 Vdc
Motor Operating Voltage: 120 Vdc
Heater Operating Voltage: 120 Vac
6.0 APPLICATION
The circuit breakers shall be operated by protective relays, supplied by others. Supplier
shall provide necessary provisions for connecting relays to the circuit breakers.
7.0 TESTS
Tests shall be conducted on the circuit breaker in accordance with ANSI/IEEE C37.09,
Test Procedure for AC High -Voltage Circuit Breakers Rated on a Symmetrical Current
Basis.
3 Specification No. ST-CB-1-2000
8.0 OPERATING MECHANISM
The circuit breakers and appurtenances shall conform to ANSI C37.11. The operating
mechanism shall be designed with the circuit breakers to ensure positive opening of the
circuit breakers and circuit interruption, whether the tripping impulse is received in the
fully closed or any partially closed position. If the release or tripping circuit is completed
through an auxiliary switch, electrical release or tripping will not take place until such
auxiliary switch is closed.
8.1 Local operation of the circuit breaker shall be permitted. The breaker shall have
mechanisms which allow for direct mechanical close and trip operations at the
breaker.
8.2 Remote operation of the circuit breaker via SCADA shall be permitted.
8.3 Circuit breaker shall be equipped with an operation counter that operates only
during the opening cycle of the breaker operation.
8.4 Circuit breaker shall be designed such that provisions and mounting facilities for
the application of a time travel device shall be made. Instructions and required
equipment shall be furnished for timing circuit breaker.
8.5 The operating mechanism shall be of the stored energy spring type sufficient for
an Open -Close -Open operation without power supplied to the spring charging
motor. The closing spring shall be charged with a DC motor and shall be
recharged immediately after closing the breaker. The closing spring shall be
capable of being manually charged. An indicator that shows the "charged" or
"discharged" status of the closing spring shall be furnished. Provisions shall be
made to prevent overcharging of the spring and to prevent insufficiently charged
spring from attempting a close operation.
8.6 The circuit breakers shall be furnished complete with all necessary auxiliary relays
for the following operations:
1. An anti -pumping device shall be included to assure that the operating
mechanism makes only one closing operation with each closure of the
control contact device, even though the breaker trips during the closing
operation while the control circuit remains closed.
2. Once the closing control switch has been operated and the first device in
the control scheme has responded, the circuit breaker mechanism shall
make one complete closing operation even though the control switch is
4 Specification No. ST-CB-1-2000
3. The trip coil auxiliary "a" switch shall be so arranged that the trip coil
circuit is opened within 2 cycles after the main breaker contacts part.
Also, on the closing operation, the trip coil auxiliary "a" switch shall close
before the arcing contacts touch.
8.7 The circuit breaker shall be electrically and mechanically trip free.
8.8 Overcurrent protective devices shall not be used in the circuits containing the
closing control devices, the tripping devices, the indicating lights, and the
associated auxiliary relays, wiring and contacts. Direct current motors used for
spring charging shall be furnished with a two -pole, single -throw 250 V, 30 A,
knife switch fused to protect the motor from thermal damage due to overcurrents
caused by a locked rotor.
8.9 The stationary and moving contact assemblies shall be designed so that loading
springs, retaining pins, and parts other than the main or arcing contacts do not
form an essential part of the current -carrying circuit.
8.10 The current interrupting contacts shall be so guided that positive and complete
contact and latching, without rebound, is assured on all closures up to rated
making and latching currents.
8.11 The power -carrying circuit shall be capable of carrying its rated current at rated
frequency continuously without excessive maintenance. The terminals and
connections between parts shall be so designed as to assure permanent low -
resistance connections.
8.12 A latch check switch shall be installed.
8.13 Auxiliary and Momentary Contact Switches
The circuit breaker shall be furnished with the following switches for use
by the City. These contact switches are in addition to any contacts used
for the factory wired operating circuits of the breaker control.
Five single -pole "a" auxiliary switches, closed when the breaker is
closed.
2. Five single -pole "b" auxiliary switches, closed when the breaker is
open.
2. One each of the single -pole "a" and "b" switches will be used for
5 Specification No. ST-CB-1-2000
switchboard indicating lights. They shall be arranged so that they are
connected in series between the positive and negative polarities and so that
both do not close simultaneously during circuit breaker operation. One
wire will be used by City to connect the common of the two auxiliary
switches to the common of the two switchboard indicating lights. The red
switchboard indicating light shall be operated by the "a" switch and the
green light shall be operated by the "b" switch.
8.14 Mechanical Operation Indicator
The operating mechanism of each circuit breaker shall be equipped with a
mechanical operation indicator that will show whether the circuit breaker is open
or closed. The operation indicator shall be located in a visible position.
9.0 BUSHINGS
General
9.1 Bushings shall be copper conductor material with threaded studs. External
bushings studs shall be silver plated. Bushing shells shall be of wet process
porcelain.
9.2 Bushings shall be furnished with terminal connectors. NEMA Standard pads
should be provided to accommodate termination of high and low voltage
conductors.
9.3 Bushings shall have nameplates which show, as a minimum, the information
listed in ANSI Standard C76.2.
9.4 The current ratings of the bushings and bushings leads shall be suitable for the
maximum rating of the circuit breaker.
9.5 Bushings shall meet the temperature limitations specified in ANSI Standard
C76.1. Proof of compliance with this requirement shall be furnished.
9.6 The minimum external clearances shall be as specified in NEMA Publication No.
TRl .
9.7 Minimum creepage distance shall be not less than 1.3 inches per kV rms (phase to
ground).
9.8 All bushings shall have provisions for insulation power factor testing.
6 Specification No. ST-CB-1-2000
9.9 Bushings shall withstand ANSI Standard 60 Hz applied potential and impulse test
voltages required for their indicated BIL, rating.
9.10 Bushings shall have electrical characteristics which conform to ANSI Standard
C76.2.
9.11 Bushing shall meet the dimensional requirements of ANSI Standard C76.2.
9.12 Bushings shall be ANSI #70, light gray in color.
10.0 CURRENT TRANSFORMERS
Bushing mounted current transformers with accuracy class of C200 shall be furnished
with the circuit breaker bushings. The current transformers shall have 1200:5 multi -ratio
with 5 taps per ANSI Standard C57.13. Current transformers shall be wired to the
breaker. The secondary wiring shall be free of splices and shall be terminated on shorting
terminal blocks in the breaker mechanism cabinet. Nameplates for the current
transformers shall be mounted in the mechanism cabinet. Provision shall be made at
terminal blocks for convenient and adequate grounding of current transformer secondary
circuits.
11.0 METHOD OF INTERRUPTING
The circuit breaker shall be vacuum or SF6 gas insulated.
11.1 S&Gas
l . There shall be sufficient amount of SF6 gas to fill the breaker to normal
operating levels.
2. SF6 fill connections shall be located inside the mechanism cabinet.
3. Temperature compensated S176 gas pressure gauge or density monitor shall
be provided for each S176 gas space. The gauges or monitors shall be
clearly marked indicating the maximum and minimum range for normal
breaker operation.
4. Low SF6 gas pressure alarm - Two normally open auxiliary alarm contact
that will close when the SF6 gas pressure reaches its minimum for normal
breaker operation.
5. Breaker lockout alarm - Two normally closed auxiliary alarm contacts
that will open when the breaker is locked out due to insufficient SF6 gas
7 Specification No. ST-CB-1-2000
pressure or density, and will prevent breaker closing.
6. Breaker low S176 trip — The SF6 pressure sensing device shall
automatically trip the breaker when S176 pressure drops below minimum
recommended values.
12.0 BREAKER MECHANISM CABINET
All wiring shall be terminated on terminal blocks inside a weatherproof cabinet which
shall be provided as an integral part of the outdoor circuit breaker. Heaters shall be
provided to minimize condensation. Heaters in areas subject to accidental contact shall
\ be equipped with guards.
13.0 CONTROL AND SECONDARY WIRING
13.1 All terminal of control wires and instrument transformer circuits shall be
identified with permanent wire cable markers. Identification shall be the same as
shown on the breaker elementary and wiring diagrams.
13.2 Current transformers, and control and instrument transformer secondary wiring,
where apart of the breaker or its assembly, shall be located or protected by
metallic coverings so as to provide adequate shielding for voltages induced by
switching surges, from arcing in or around the circuit breaker, and to minimize the
possibility of insulation failure introducing line potential on this wiring.
13.3 The insulation class of all control and instrument transformer secondary wiring
shall be coordinated with the voltage conditions it may be expected to encounter
and shall in no case be less than 600 volts.
13.4 The control and instrument transformer secondary wiring shall be oil-, water-, and
flame -resistant, and shall.be provided with oil stops where it enters a chamber and
is exposed to oil vapor. Polarity, phase, and tap identification shall be provided.
13.5 Closing and trip coil leads, instrument transformer secondary leads, solenoid
valve leads, and similar wiring shall be securely anchored to the coil.
13.6 Wire sizes for control wiring and instrument transformer secondary leads shall be
coordinated with the inherent current requirements and voltage drop limitations of
the breaker. Wire shall be stranded copper and in no case shall be smaller that
No. 14 AWG. The wire ends shall be permanently fitted with pressure -type
connectors before attachment to terminal studs. Splices shall be avoided wherever
practicable, but, if required, they shall be brazed or made by permanently fitted
pressure -type connectors.
8 Specification No. ST-CB-1-2000
14.0 DATA, DRAWINGS, MANUALS, INSPECTION, AND TEST PLAN
14.1 All drawings shall be furnished in electronic format using AutoCAD Version 14,
or later.
14.2 Supplier shall furnish four full sets of outline and bushing drawings, wiring
diagrams, conduit and terminal details for all control and auxiliary devices; and
any other drawings and documents that clearly describe the construction,
installation and operation of the circuit breaker. Data furnished shall include a
listing of guide values for,static and dynamic forces that influence the foundation
loading requirements.
14.3 Supplier shall submit complete instruction manuals, including part numbers of
assemblies, components, and all devices furnished with the circuit breaker. The
manuals shall provide complete and detailed instructions for erection, installation,
operation, adjustment, and maintenance. One manual shall be located in a pocket
attached inside the mechanism cabinet when the circuit breaker is shipped. Then
manual shall be furnished in electronic format using MicrosoftTM Word.
14.4 Copies of the certified test reports for all specified tests shall be submitted by the
supplier. Data shall include:
1. Actual contact opening time from energization of trip coil to contact
parting.
2. Travel record curve for application of a time travel device.
3. Maximum do resistance of power carrying circuit from terminal to
terminal.
4. Power factor of bushings.
14.5 A detailed inspection and test plan shall be submitted by the supplier.
14.6 Supplier shall provide a list of recommended spare parts with price schedule to be
maintained as spares by the City.
14.7 Supplier shall submit detailed inspection and test plan. City shall have the right to
witness testing of the circuit breaker.
15.0 SPARE PARTS
Supplier shall furnish, on request, repair replacement parts for a period of at least 20
9 Specification No. ST-CB-1-2000
years, by maintaining an inventory of all necessary spare parts.
16.0 PROPOSAL REQUIREMENTS
Vendors responding to the request for proposal shall furnish all information necessary to
completely describe the circuit breaker intended to be supplied in accordance with this
specification. The information required shall include but not limited to:
16.1 Circuit breaker type and manufacturer's model number.
16.2 Drawings and photographs that clearly describe the construction and operation of
the circuit breaker, including a listing of guide values that affect the foundation
loading requirements.
16.3 Ratings and Required Capabilities
1. Voltage Ratings
1. Rated maximum voltage (kV)
2. Rated voltage range factor (k)
2. Insulation Level Withstand Tests
1. Rated low frequency withstand voltage (rms kV)
2. Rated full wave impulse withstand voltage (crest kV)
3. Current Ratings
1. Continuous
2. Closing and latching capability
3. Short -time carrying capability
4. Interrupting Ratings
1. Rated short circuit current
2. Maximum symmetrical interrupting capability
3. Maximum asymmetrical interrupting capability
10 Specification No. ST-CB-1-2000
4. Percent of rating for specified reclosing duty cycle
5. Time Characteristics at Rated Control Voltage and Operating Pressure
1. Opening time from energization of trip coil to contact parting
2. Closing time
3. Maximum Interrupting time
4. Additional time for interrupting of resistor current
6. Electrical Data
1. Phase spacing
2. Phase to ground external creepage distance
3. External striking distance
1. Phase to phase
2. Phase to ground
g. Operating Mechanism and Auxiliaries Data
1. Number of close -open operations before recharging spring
2. Rated voltage, frequency, and current and maximum starting
current required to operate spring -charging motor
3. Description of control circuit
4. Time required to charge the spring
3. Bushing Data
1. Name of bushing manufacturer, type designation, and model
number
2. Outline drawing
3. Voltage rating
11 Specification No. ST-CB-1-2000
4.
Current Rating
5.
Wet withstand voltage test at operating frequency
6.
Dry withstand voltage test at operating frequency
7.
Full wave impulse withstand voltage test
8.
Permissible safe cantilever loading at external terminal of bushing
9.
Provisions for power factor test
4. General Information
1.
Net weight of circuit breaker with and without gas
2.
Quantity of gas
3.
Provisions for filling and removing gas
4.
Handling provisions
5.
Provisions for lifting and removing bushings and vertical clearance
required for bushing removal
6.
Facilities for removing and replacing interrupter assemblies
7.
Impact loading of circuit breaker during opening and closing
operations
12 Specification No. ST-CB-1-2000
SUPPORTING
DOCUMENTS
OFFICE OF THE CITY ADMINISTRATOR/CITY CLERK
INTER -OFFICE MEMORANDUM
Date: January 24, 2001
To: Dolores Fonseca, Purchasing Assistant
From: Gloria J. Orosco, Chief Deputy City Clerk
Re: Resolution No. 7690
Transmitted herewith is a copy of Resolution No. 7690 that was
approved by City Council on January 17, 2001 approving and
authorizing notice inviting sealed proposals or bids for the
purchase of six (6) circuit breakers to replace the existing
ones.
GJO/ng