CircuitBreaker_33-75-23.pdf
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- Solicitation number
- ITB 26-24
- Issued by
- Polk County, Florida
About this file
This is a technical specification document for high-voltage outdoor circuit breakers issued by the City of Bartow, Florida, detailing requirements for the purchase of three new medium voltage vacuum circuit breakers to replace obsolete units at the Church Street Substation. The specification, Section 33-75-23, establishes comprehensive technical design requirements and control systems for distribution feeder breakers, including detailed performance ratings, materials, equipment standards, and operational mechanisms. Pre-approved manufacturers include ABB type R-MAG, Siemens type SDV7-MA, or equal alternatives subject to pre-approval by the City of Bartow prior to the bid submission deadline. Each circuit breaker unit must be a 3-pole outdoor type with a maximum voltage rating of 15 kV, nominal operating voltage of 12.47 kV, continuous current capacity of 1200 amperes, minimum short circuit current of 20 kA at 15 kV, and interrupting time of three cycles, all compliant with IEEE C37.04 and C37.06 standards.
The specification mandates that each circuit breaker be factory-installed with one SEL-351S Protection System Relay, completely wired and integrated into the control cabinet, with all current transformer leads, terminal blocks, and control wiring pre-installed and tested by the manufacturer. The control cabinet must include specific components such as LED indicating lamps, local-remote SCADA switches, mechanical position indicators, operation counters, auxiliary switches, terminal blocks with spare positions, and tripping devices. All current-carrying parts must be copper or copper alloy, external hardware must be stainless steel type 316, and bushings must be dry or sealed-condenser type compliant with IEEE C57.19.00 and C57.19.01. The equipment contractor is responsible for furnishing fully assembled, factory-tested breakers meeting all applicable IEEE, ASTM, and NEMA standards, coordinating delivery, supplying required documentation, and ensuring all materials are new and suitable for utility substation conditions. Bidders are required to submit recommended spare parts, including part numbers and associated costs, as part of their bid tabulation.
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Text version
SECTION 33-75-23
HIGH-VOLTAGE SWITCHGEAR AND PROTECTIVE DEVICES
OUTDOOR CIRCUIT BREAKER
PART 1 -GENERAL
1.01 WORK INCLUDED
This section supplements the Outdoor Circuit Breaker General Requirements Section 33-75-00. The technical design requirements and associated control systems and operating systems for distribution feeder breakers are outlined herein.
1.02 RELATED SECTIONS
A. The bidding documents are a part of this section as if incorporated herein.
B. Other related sections are as listed below:
1. Section 33-75-00, High-Voltage Switchgear and Protective Devices, Outdoor Circuit Breaker General Requirements
1.03 REFERENCES
The work shall conform to the applicable requirements of all Federal, State and local agencies and applicable provisions of the latest edition or revision of the standards set forth in Article 1.03 (References) of Section 33-75-00, except as modified herein.
1.04 RATINGS
The Circuit Breaker shall conform to the ratings as defined in IEEE C37.04 and as listed in IEEE C37.06, and shall meet or exceed the following ratings:
A. Maximum voltage 15 kV B. Nominal Operating voltage 12.47 kV C. Continuous current 1200 A D. Short circuit current, minimum 20 kA at 15 kV E. Interrupting time 3 cycles F. Closing and latching capability, Asymmetrical 31 kA G. Full wave withstand, dielectric 150 kV H. Control voltage 125 Vdc
PART 2-PRODUCTS
2.01 MATERIALS AND EQUIPMENT
Materials and equipment shall comply with the requirements of Section 33-75-00, and the following.
2.02 CIRCUIT BREAKER
A. The following manufacturers and devices are pre-approved. Any manufacturer not on the pre-approved list and wishing to submit a bid shall apply for pre-approval prior to the deadline to submit questions in the bid documents. Approval will be at the sole discretion of the City of Bartow.
a. ABB type R-MAG
b. Siemens type SDV7-MA
c. Or equal
B. The circuit breaker shall be an outdoor type, 3-pole, single throw, frame-mounted, complete with, but not limited to, appurtenances, accessories and spare parts, as hereinafter specified. All current carrying parts shall be copper or appropriate copper alloy.
C. The ampere, voltage, and interrupting ratings of the circuit breaker shall have been established by test on the type breaker proposed. Interrupting medium shall be vacuum. Interrupting capacity shall be based on O - 0.3 Sec. - CO - 15 Sec. - CO duty cycle.
D. The circuit breaker shall be mounted on a hot-dip galvanized steel supporting framework, adjustable in height, with all enclosures securely attached to the frame.
E. All external hardware such as nuts, bolts, washers, hinges, door handles, etc., shall be stainless steel type 316.
F. The circuit breaker shall have gauges for pertinent systems, if applicable. Enclosures shall have window glass to view any gauges contained within.
G. A typical elementary diagram is shown on Figure No. AA-2, appended to this Section of the specifications. This elementary shows the basic functional operation requirements, but is not necessarily complete.
H. The manufacturer shall furnish one (1) SEL-351S Protection System Relay for each circuit breaker. The relay shall be factory-installed, completely wired, configured for Owner-furnished settings, tested, and fully integrated into the breaker control cabinet. All CT, PT, control, trip, close, alarm, communications, terminal blocks, test switches and auxiliary relay wiring required for a complete operational protection and control system shall be provided by the manufacturer.
I. The circuit breaker cabinet shall have two copper-faced or stainless steel ground pads, diagonally opposite, with two 0.50-13 tapped holes on 1.75-inch centers[, each equipped with a clamp type grounding connector, for #4/0 AWG copper cable, Hubbell/Anderson Cat. No. SWL-025B or approved equal].
2.03 OPERATING MECHANISM
A. The circuit breaker shall include an operating mechanism arranged to close and trip the breaker by local or remote electrical control. The equipment shall be trip-free mechanically and electrically.
B. Operating mechanism shall be magnetically-actuated, and shall have a 125 VDC closing coil and two 125 VDC shunt trip coils.
C. The closing mechanism shall be stored energy type. Closing of the circuit breaker shall completely charge all stored energy devices so that the circuit breaker is ready for all subsequent operations that may be required.
D. The circuit breaker shall provide local and remote alarms for failure of the stored energy devices to fully charge subsequent to a close operation of the circuit breaker. Alarm must activate when stored energy devices fail to charge, regardless of whether the breaker contacts are open or closed.
2.04 BUSHINGS
A. The bushings shall be dry or sealed-condenser type with oil impregnated paper, wet process porcelain of manufacturer's standard design for the particular application. Bushings shall have uniform smooth hard glaze, light gray in color. The glaze shall be free from imperfections. The bushing’s shall be impervious to moisture. The bushings shall comply in full with performance and test requirements of the applicable ANSI and NEMA standards.
B. Bushings shall be equipped with 1-1/2”-12 threaded studs.
C. Bushings shall comply with the dimensions, performance and test requirements of IEEE C57.19.00 and IEEE C57.19.01 and shall have minimum ratings as follows:
1. Voltage Class 15 kV
2. Continuous Current 1200 A
3. BIL 150 kV
4. Low frequency dielectric, one minute dry 60 kV
5. Low frequency dielectric, 10 second wet 50 kV
6. Minimum Creep 20 inches
2.05 CURRENT TRANSFORMERS
The circuit breaker shall be equipped with twelve 1200/5 ampere bushing-type, five tap multi-ratio, current transformers as shown on Figure No. AA-1, appended to this Section of the specifications. The bushing current transformers shall have an accuracy classification of not less than C200. Polarity marks on BCT's shall be toward external bushing terminals.
A. The following data shall be furnished with shop drawing submittals for multi-ratio transformers:
1. Typical ratio correction factor curves for each ratio for the ANSI Standard B2 burden (50 VA at 0.5 PF) over a range of 0.25 to 2.0 times rated primary current.
2. Typical ANSI excitation curve for each ratio.
3. Actual turns ratio for each tap.
B. Secondary leads shall be installed in weatherproof rigid galvanized steel or aluminum conduit from the current transformers to the terminal blocks in the control cabinet.
1. CT wiring shall be #10 AWG stranded copper conductor with type SIS insulation.
2. The leads from the current transformers shall be marked to indicate the taps and polarity and shall be brought out to shorting terminal blocks within the control mechanism housing.
2.06 CONTROL AND RELAY CABINET
The control and relay cabinet shall be equipped with the following:
A. one (1) SEL-351S Protection System Relay and Test switches.
B. One circuit breaker control switch, with spring return operation, pistol grip handle, and target escutcheon. Number of stages and contact arrangements will be as required. General Electric Type 16SB1, or similar. ANSI Device No. 52CS.
C. Two LED indicating lamps, complete with resistor for 125 Vdc. One red lens (left) for OCB "close" position indication and one green lens (right) for OCB "open" position indication. General Electric Type ET-16, or similar.
D. One “local-remote” SCADA cut-out switch, minimum four-stage, 8 contacts (half of the contacts closed in "local," half closed in "remote"), with knurled handle. General Electric Type 16SB1, or similar. ANSI Device No. 43.
E. One mechanical position indicator, clearly visible with the control cabinet door closed, to indicate whether the breaker is in the open or closed position.
F. One mechanically actuated operation counter, advancing upon breaker opening, visible with the control cabinet door closed.
G. One tripping device for manually tripping the breaker without opening the control cabinet, protected to prevent inadvertent operation, with an automatic lockout switch to prevent electrical reclosing.
H. One sixteen-pole (minimum) auxiliary switch. The switch shall provide a minimum of five N.O.
and five N.C. contacts in addition to those necessary to operate the circuit breaker.
I. One lot of terminal blocks. The control cabinet shall be provided with adequate terminal blocks for each conductor entering or leaving the cabinet, Penn-Union (Cat. No. 6006-SC for current transformer and 6012 for controls), or equivalent GE or Marathon. Terminal positions shall be provided for each conductor, and shall be conveniently located for making connections to external power and control wiring entering.
1. Terminal blocks shall have an engraved phenolic type white marker strip having the terminal point identification in black as shown on the Manufacturer’s certified drawings. The Owner’s standard terminal numbering shall be used for interconnection terminal points, and will be provided to the successful Bidder.
2. In addition to those terminals required for internal purposes and those required for external conductors to be connected at the time the circuit breaker is installed, a minimum of two twelve-point terminal blocks shall be provided as spare positions for use of the Owner.
J. One lot of internal control wiring, including one lot wiring provisions for tripping and close circuit blocking by transformer and/or bus differential lockout relays. Switchboard control wiring shall be #14 AWG, minimum, stranded copper conductor with type SIS insulation material.
1. Manufacturer shall not terminate more than two internal wires on any single terminal position.
2. Factory wiring shall be arranged neatly, grouped and tie-wrapped, or in appropriate raceways.
K. Connectors for control wiring shall be seamless non-insulated ring tongue of appropriate size, Burndy Type YAV or approved equal.
L. All control wiring shall be identified at both ends with wrap around markers carrying the same wire marks as shown on the Manufacturer’s certified drawings and shall be supported in such a manner as to permit visual tracing of all the wires. Wire marking shall be performed by the use of T & B “E-Z Code” self-laminating adhesive material or equal.
M. A plastic nameplate shall be furnished for each control device, instrument and protective relay.
Nameplates shall be black with white lettering, engraved as specified at time of shop drawing review. Nameplates shall be permanently attached adjacent to and above the corresponding device.
N. One latch checking switch, if applicable.
O. Elapsed time meters for pertinent systems, if applicable.
P. Pressure lockout/alarm switches, if applicable.
2.07 APPLICATION
The Circuit Breaker will be installed as a feeder breaker. Trip Coil 1 will interface with microprocessor based feeder overcurrent relaying. Trip Coil 2 will interface with under-frequency relaying.
2.08 ELECTRICAL
A. All operating devices shall be suitable for 120/240VAC single-phase and/or 125VDC, as specified.
B. AC service voltages listed are nominal. The following voltage ranges shall be used in designing and selecting the components:
Nominal Voltage Operating Voltage 120 volts 110 volts to 140 volts 240 volts 220 volts to 280 volts
C. All heaters shall be connected with or without thermostats to a separately fused 240 VAC source, with provision for reconnection at 120 VAC. All heaters shall be supplied with high temperature insulated wire, and shall have personnel protective barriers.
D. Fused knife switches shall be provided for the trip circuits, close control circuit, motor circuit (if applicable), and heater circuit. The knife switches shall be located in a finger safe or guarded position. All protective devices for other circuits shall be approved circuit breakers. Control circuit breakers shall be thermal magnetic with front adjustable, non-interchangeable, ambient and enclosure compensation.
a. The wiring shall be such that the charging motor is separately protected by a circuit breaker from the close control circuit.
E. The Manufacturer shall supply a spare fuse block, modular type. with two spare fuses for the close circuit and two spare fuses for the trip circuit.
F. One duplex G.F.C.I., 15 ampere, 120 VAC 3-wire grounding utility outlet (NEMA 5-15R) and one cabinet light with switch shall be installed inside the control cabinet on a dedicated power circuit.
2.09 SPARE PARTS
If applicable, the Bidder shall list their recommended spare parts for the Circuit Breaker described herein on Bid Tabulation Form Appendix 3, Sheet 2, including description, part numbers, cost of each, and total cost.
Figure AA-1
Circuit Breaker Current Transformer Connection Diagram
Figure AA-2
Circuit Breaker Control Elementary
END OF SECTION
1.02 RELATED SECTIONS
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