SECTION 16311

SECONDARY UNIT SUBSTATION

PART 1 GENERAL

SECTION INCLUDES

Secondary unit substation.

RELATED WORK

Section 03300 - Concrete: Housekeeping pad for substation.

REFERENCES

ANSI C12 - Code for Electricity Metering.

ANSI C39.1 - Requirements for Electrical Analog Indicating Instruments.

ANSI C57.13 - Requirements for Instrument Transformers.

FS W-C-375 - Circuit Breakers, Molded Case, Branch Circuit and Service.

FS W-F-870 - Fuseholders (For Plug and Enclosed Cartridge Fuses).

FS W-S-865 - Enclosed Knife Switch.

ANSI/IEEE 24 - Performance Characteristics and Dimensions for Outdoor Apparatus Bushings.

IEEE 48 - Test Procedures and Requirements for High-Voltage AC Cable Terminations.

NEMA AB 1 - Molded Case Circuit Breakers.

NEMA KS 1 - Enclosed Switches.

NEMA PB 2 - Dead Front Distribution Switchboards.

NEMA SG 5 - Power Switchgear Assemblies.

NEMA 210 - Secondary Unit Substations.

SUBMITTALS

Submit shop drawings under provisions of Section [01300.] [01340.]

Submit shop drawings indicating front and side views of enclosures with overall dimensions shown; conduit entrance locations and requirements; nameplate legends; size and number of bus bars per phase, [neutral,] and ground; switchboard instrument details; instructions for handling and installation of switchboard; and electrical characteristics including voltage, frame size and trip ratings, withstand ratings, and time-current curves of all equipment and components.

Submit product data under provisions of Section [01300.] [01340.]

Submit product data for each component and accessory specified.

Submit manufacturer's certificate under provisions of Section [01400] [01405] that [products] [__________] meet or exceed [specified requirements.] [__________________.]

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

Submit manufacturer's field reports under provisions of Section [01400.] [01405.]

Submit field reports indicating final adjustments and overcurrent protective device coordination curves.

PROJECT RECORD DOCUMENTS

Submit record documents under provisions of Section [01700.] [01720.]

Accurately record actual locations of substations and circuit connections.

OPERATION AND MAINTENANCE DATA

Submit operation data under provisions of Section [01700.] [01730.]

Include overcurrent protective device adjusting and testing instructions.

Submit maintenance data under provisions of Section [01700.] [01730.]

Include bus tightening intervals and procedures, [transformer insulation liquid sampling and replacement procedures,] and overcurrent protective device maintenance procedures.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum [three] [_____] years [documented] experience.

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Store and protect products under provisions of Section [01600.] [01620.]

Accept products on site in factory shipping splits and verify damage.

Protect products from moisture and debris by storing in a clean, dry heated space. Maintain factory wrapping or provide an additional heavy canvas or heavy plastic cover to protect units. Provide auxiliary heating in switchgear and transformer sections in accordance with manufacturer instructions.

EXTRA MATERIALS

Submit maintenance materials under provisions of Section [01700.] [01750.]

Submit [___________________________________.]

Submit [two] [_____] of each size and type fuse under provisions of Section [01700.] [01750.]

PART 2 PRODUCTS

MANUFACTURERS

[_________________________________] Model [__________.]

[_________________________________] Model [__________.]

[_________________________________] Model [__________.]

Substitutions: Under provisions of Section [01600.] [01630.]

SECONDARY UNIT SUBSTATION

Description: Articulated secondary unit substation manufactured to NEMA 210.

Service Conditions:

Temperature: [___] degrees F ([___] degrees C).

Altitude: [6600] [____] feet ([2000] [____] M).

Exposure to [____________________.]

Seismic Conditions: [______________________________.]

Configuration: [Radial type][,][.] [Distributed network type][,][.] [Spot network type][,][.] [Secondary selective type][,][.] [with indoor-outdoor arrangement.]

INCOMING SECTION EQUIPMENT

Description: [Primary cover bushings.] [Air terminal compartment, [single circuit.] [looped feed.]] [[Fused] [Unfused] distribution oil cutouts.] [Oil-immersed interrupter switch, [single circuit.] [selector circuit.]] [[Fused] [Unfused] air interrupter switch, [two position.] [dual switch.] [selector switch.]] [ Metal clad switchgear, with [one] [two] [three] power circuit breakers.]

Configuration: [One] [Two] incoming lines[.] [,looped.]

System Voltage: [_____] kV, three phase, 60 Hz.

Maximum Design Voltage: [5] [15] [25.8] [38] kV.

Basic Impulse Level: [95] [_____] kV.

Continuous Rating: [_____] amperes.

Main Bus Ampacity: [_____] amperes, continuous.

Short Circuit Rating: [_____] rms symmetrical amperes; [_____] rms symmetrical MVA at rated nominal voltage.

Provide spring-charged stored energy [electric] operator.

TRANSFORMER SECTION EQUIPMENT

Description: [Oil-immersed] [Ventilated] type distribution transformer.

Capacity: [_____] kVA, self cooled [;][.] [[_____] kVA, fan cooled] [include provisions for future fan cooling to [_____] kVA].]

Voltage: [_____] kV primary; [_____] volts secondary.

Connections: [Delta-Wye.] [____________________.]

Temperature Rise: [65 degrees C.] [220 degree C insulation class with [85] [115] [150] degree C rise over 40 degree C ambient.]

OUTGOING SECTION EQUIPMENT

Description: [Switchboard manufactured to NEMA PB 2.] [Power switchgear manufactured to NEMA SG 5.]

Line and Load Terminations: Accessible from the [front only] [rear], suitable for the conductor materials used.

Main Section Devices: [Panel mounted.] [Individually mounted.] [Individually mounted and compartmented.]

Distribution Section Devices: [Panel mounted.] [Individually mounted.] [Individually mounted and compartmented.]

Auxiliary Section Devices: [Individually mounted.] [Individually mounted and compartmented.]

Bus Material: [Copper] [Aluminum with tin plating], sized in accordance with NEMA PB 2.

Bus Connections: [Bolted] [Welded], accessible from [front] [rear only] for maintenance.

Fully insulate bus bars [throughout, with [reduced bus spacing.] [bus spacing based on air insulation.] [on load side in rear accessible compartments.] Insulate using [____________________.]

Fusible Switch Assemblies: [NEMA KS 1] [FS W-S-865]; quick-make, quick-break, load interrupter enclosed knife switch with externally operable handle. Provide interlock to prevent opening front cover with switch in ON position. Handle lockable in OFF position. Fuse clips: [FS W-F-870.] [Designed to accommodate Class [R] [J] fuses, type as specified.]

Fusible Switch Assemblies, 800 Amperes and Larger: Bolted pressure contact switches. Fuse clips: [FS W-F-870.] [Designed to accommodate Class L fuses.]

Molded Case Circuit Breakers: [NEMA AB 1;] [FS W-C-375;] [Inverse time automatic tripping.] [Integrally fused with inverse time automatic tripping.] [Integrally fused with instantaneous automatic tripping.]

Field-Adjustable Trip Circuit Breaker: [Provide circuit breakers with frame sizes [200] [___] amperes and larger with mechanism for adjusting [long time] [short time] [continuous current] [[short time] [long time] pickup current] setting for automatic operation. Range of Adjustment: [____________________] [seconds.] [amperes.] [percent.]

Field-Changeable Ampere Rating Circuit Breaker: Provide circuit breakers with frame sizes [200] [___] amperes and larger with changeable trip units.

Current Limiting Circuit Breaker: Provide circuit breaker [as scheduled] with automatically-resetting current limiting elements in each pole. Let-through current and energy shall be less than permitted for same size Class RK-5 fuse.

Solid-State Circuit Breaker: Provide circuit breaker [as scheduled] with electronic sensing, timing and tripping circuits for adjustable current settings; [ground fault trip with [integral ground fault sensing] [zero sequence type ground fault sensor];] instantaneous trip; and adjustable short time trip.

Current Limiter: Designed for application with molded case circuit breaker.

Coordinate limiter size with trip rating of circuit breaker to prevent nuisance tripping and to achieve interrupting current rating specified for circuit breaker.

Provide interlocks to trip circuit breaker and to prevent closing circuit breaker when limiter compartment cover is removed or when one or more limiters is not in place or has operated.

Power Circuit Breakers: NEMA SG 5; factory-assembled [electrically-] [mechanically-] operated low-voltage air circuit breakers, [stationary mounting.] [drawout construction.] Include electronic sensing, timing and tripping circuits for adjustable current, long-time pickup and long-time delay; [ground-fault pickup and delay;] adjustable instantaneous pickup; short-time pickup and delay. [[Ground fault sensing shall be integral with circuit breaker.] [Provide zero sequence type ground fault sensor.]]

Fuses 600 Amperes and Less: [Dual element,] current limiting, [time delay,] one-time fuse, [250] [600] volt, UL Class [RK 1.] [RK 5.] [J.] [as scheduled [on Drawings].] [; Model [__________],] manufactured by [____________________.]

Fuses 601 Amperes an Larger: Current limiting, [time delay] [fast-acting] one time fuse, 600 volt, UL Class L. [; Model [__________],] manufactured by [____________________.]

INSTRUMENTS AND SENSORS

Ammeters: ANSI C39.1; indicating ammeters with 4.5 inch (115 mm) square recessed case and 250 degree scale, white dial with black figures and pointer, 5 ampere, 60 Hertz movement, 1 percent accuracy.

Voltmeters: ANSI C39.1 indicating voltmeter with 4.5 inch (115 mm) square recessed case and 250 degree scale, white dial with black figures and pointer, 120 volt, 60 Hertz movement, 1 percent accuracy.

Ammeter Transfer Switch: Rotary multistage snap-action type with 600 volt AC-DC silver plated contacts, engraved escutcheon plate, [pistol-grip] [oval type] handle, and four positions including OFF.

Voltmeter Transfer Switch: Rotary multistage snap-action type with 600 volt AC-DC silver plated contacts, engraved escutcheon plate, [pistol-grip] [oval type] handle, and [four] [seven] positions including OFF.

Watt-hour Meters and Wattmeters: ANSI C12; three phase induction type with two stators, each with current and potential coil, rated 5 amperes and 120 volts at 60 Hertz. Meter suitable for connection to 3- and 4-wire circuits. Include potential indicating lamps; adjustments for light and full load, phase balance, and power factor; four-dial clock register; [integral demand indicator] [contact devices to operate remote impulse-totalizing demand meter]; ratchets to prevent reverse rotation; removable meter with draw-out test plug; semi-flush mounted case with matching cover.

Impulse-Totalizing Demand Meter: ANSI C12; suitable for use with switchboard watt-hour meter, including two circuit totalizing relay; cyclometer: [four dial totalizing kilowatt-hour register;] positive chart drive mechanism; capillary pen holding minimum one-month ink supply; and a roll chart with minimum 31-day capacity. Indicate and record [five minute] [fifteen minute] [30 minute] [_____] integrated demand of the totalized system.

Current Transformers: ANSI C57.13; 5 ampere secondary, [would] [bushing] [bar or window] type, with [single] [double] secondary winding and secondary shorting device, primary/secondary ratio as [required] [shown on Drawings], burden and accuracy consistent with connected metering and relay devices, 60 Hertz.

Potential Transformers: ANSI C57.13; 120 volt (single] [tapped] [double] secondary, disconnecting type with integral fuse mountings, primary/secondary ratio as [required] [shown on Drawings], burden and accuracy consistent with connected metering and relay devices, 60 Hertz.

Ground Fault Sensor: [Zero sequence] [Ground return] type.

Ground Fault Relay: Adjustable ground fault sensitivity from 200 to 1200 amperes, time delay [__________] [adjustable from 0 to 15] seconds. Provide monitor panel with lamp to indicate relay operation, TEST and RESET control switches.

FABRICATION

Provide a [1 x 1/4] [__________] inch ([25 x 6] [_____x_____] mm) copper ground bus through the length of the switchboard.

Align sections at [front and rear.] [rear only.] [front only.]

Finish: Manufacturer's standard light gray enamel over external surfaces. Coat internal surfaces with minimum one coat corrosion-resisting paint, or plate with cadmium or zinc.

Mimic Bus: Indicate bussing, connections and devices in single line form on the front panels of the switchboard using [blue] [black] [__________] color [factory painting] [plastic strips] [light metal strips] [__________][,][.] [fastened flat against the panel face with [screws or rivets.] [adhesive.]]

Future Provisions: Fully equip spaces indicated for future devices with bussing and bus connections.

ACCESSORIES

Surge Arrestors: [Station] [Intermediate] [Distribution] class, rated [___] kV; mount in incoming line compartment.

Incoming Cable Terminations: [Clamp-type.] [Potheads to IEEE 48.] [Roof bushing to ANSI/IEEE 24.]

Space Heaters: For (120] [___] volt external source, sized by substation manufacturer.

Key Interlocks: [___________________________________.]

Circuit Breaker Lifting Device: [Portable, floor supported, elevating carriage with a roller base, for movement of circuit breakers in and out of switchgear structure.] [Carriage and track on top of each switchgear with lifting device to serve draw-out circuit breakers.]

PART 3 EXECUTION

EXAMINATION

Verify that surfaces are ready to receive work.

Verify field measurements are as [shown on Drawings.] [instructed by manufacturer.]

Verify that required utilities are available, in proper location, and ready for use.

Beginning of installation means installer accepts conditions.

PREPARATION

Provide [4] [6] inch high concrete pad [2] [___] inches wider and longer than substation, under the provisions of Section 03300.

INSTALLATION

Install in accordance with manufacturer's instructions.

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400.] [01410.]

Test to NEMA 210.

ADJUSTING

Adjust work under provisions of Section [01650.] [01660.]

Adjust transformer taps to provide acceptable voltage at utilization equipment connected to substation.

Adjust [trip units] [protective relays] to provide adequate overcurrent protection and selective tripping with downstream protective devices.

END OF SECTION