26_11_14.00_10_-_Main_Elec_Supply_Station_&_Substation_-_10Aug2017.pdf

CE0435

20Mar2017 10Aug2017

26 11 14.00 10 – Page 1 of 22

SECTION 26 11 14.00 10

MAIN ELECTRIC SUPPLY STATION AND SUBSTATION

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2015) Structural Welding Code - Steel

ASME INTERNATIONAL (ASME)

ASME B31.3 (2014) Process Piping

ASME BPVC SEC IX (2010) BPVC Section IX-Welding and Brazing Qualifications

ASTM INTERNATIONAL (ASTM)

ASTM A123/A123M (2013) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A153/A153M (2009) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

ASTM A36/A36M (2014) Standard Specification for Carbon Structural Steel

ASTM A572/A572M (2015) Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel

ASTM A575 (1996; E 2013; R 2013) Standard Specification for Steel Bars, Carbon, Merchant Quality, M-Grades

ASTM A576 (1990b; R 2012) Standard Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality

ASTM A633/A633M (2013) Standard Specification for Normalized High-Strength Low-Alloy Structural Steel Plates

ASTM B8 (2011) Standard Specification for Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft

Amendment 0004

10Aug2017

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INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 242 (2001; Errata 2003) Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems - Buff Book

IEEE 399 (1997) Brown Book IEEE Recommended

Practice for Power Systems Analysis

IEEE 525 (2007) Guide for the Design and

Installation of Cable Systems in Substations

IEEE 80 (2013) Guide for Safety in AC Substation

Grounding

IEEE 81 (2012) Guide for Measuring Earth

Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System

IEEE C2 (2012; Errata 2012; INT 1-4 2012; INT 5-7

2013; INT 8-10 2014; INT 11 2015) National Electrical Safety Code

IEEE C37.04 (1999; R 2006; AMD 1 2003; R 2006; ERTA

2005; R 2006; AMD 2 2008; CORR 2009; INT

2010) Standard for Rating Structure for AC High-Voltage Circuit Breakers

IEEE C37.06 (2009) Standard for AC High-Voltage

Circuit Breakers Rated on a Symmetrical Current Basis - Preferred Ratings and Related Required Capabilities for Voltage Above 1000 V

IEEE C37.081 (1981; Supp 1997; R 2007) Guide for

Synthetic Fault Testing of AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis

IEEE C37.09 (1999; AMD 1 2005; Corr 1 2007; R 2007;

Errata 2007; Amendment B 2011) Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis

IEEE C37.20.2 (1999; Corr 2000; R 2005) Standard for

Metal-Clad Switchgear

IEEE C37.34 (1994) Standard Test Code for High-Voltage

Air Switches

IEEE C37.41 (2008; Errata 2009) Standard Design Tests for High-Voltage (>1000 V) Fuses, Fuse and Disconnecting Cutouts, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories Used with These Devices

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IEEE C37.90 (2005; R 2011) Standard for Relays and

Relay Systems Associated With Electric Power Apparatus

IEEE C37.90.1 (2012) Standard for Surge Withstand

Capability (SWC) Tests for Relays and Relay Systems Associated with Electric Power Apparatus

IEEE C57.12.00 (2010) Standard General Requirements for

Liquid-Immersed Distribution, Power, and Regulating Transformers

IEEE C57.13 (2008; INT 2009) Standard Requirements for

Instrument Transformers

IEEE C57.15 (2009) Standard Requirements, Terminology, and Test Code for Step-Voltage Regulators

IEEE C62.11 (2012) Standard for Metal-Oxide Surge

Arresters for Alternating Current Power Circuits (>1kV)

INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)

IEC 60255-21-3 (1993; ED 1.0) Electrical Relays - Part

21: Vibration, Shock, Bump And Seismic Tests On Measuring Relays And Protection Equipment - Section 3: Seismic Tests

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA C12.20 (2010) American National Standard for

Electricity Meters—0.2 and 0.5 Accuracy Classes

ANSI C29.9 (1983; R 2012) American National Standard for Wet-Process Porcelain Insulators - Apparatus, Post-Type

ANSI C29.12 (2013) American National Standard for

Composite Insulators – Transmission Suspension Type.

NEMA 250 (2014) Enclosures for Electrical Equipment

(1000 Volts Maximum)

NEMA LA 1 (2009) Standard for Surge Arresters

NEMA PB 1 (2011) Panelboards

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2014; AMD 1 2013; Errata 1 2013; AMD 2 2013; Errata 2 2013; AMD 3 2014; Errata 3-4 2014; AMD 4-6 2014) National Electrical Code

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UNDERWRITERS LABORATORIES (UL)

UL 467 (2007) Grounding and Bonding Equipment

UL 50 (2007; Reprint Apr 2012) Enclosures for Electrical

Equipment, Non-environmental Considerations

UL 6 (2007; Reprint Nov 2014) Electrical

Rigid Metal Conduit-Steel

UL 67 (2009; Reprint Apr 2015) Standard for Panelboards

UL 797 (2007) Electrical Metallic Tubing - Steel

1.2 SYSTEM DESCRIPTION

1.2.1 General

Configure the system as specified, and include structures, incoming and outgoing lines, transformers, regulators, fuses, circuit breakers, switches, switchgear, and appurtenances to provide a fully functional system.

1.2.2 Incoming and Outgoing Circuit Compliance

Aerial line circuits shall comply with the requirements of Section 33 71

01.00 40 OVERHEAD ELECTRICAL DISTRIBUTION. Underground circuits shall comply with the requirements of Section 33 71 02 UNDERGROUND ELECTRICAL DISTRIBUTION. Other circuits shall comply with the requirements of Section 26 20 00 ELECTRICAL DISTRIBUTION SYSTEM.

1.2.3 Detail Drawings

Submit detail drawings consisting of equipment drawings, illustrations, schedules, instructions, diagrams, and other information necessary to define the installation. Show on the detail drawings the ratings of items and systems and how the components of an item and system are assembled, function together, and how they will be installed on the project. Data and drawings for component parts of an item or system shall be coordinated and submitted as a unit. Multiple submissions for the same equipment or system are not acceptable except where prior approval has been obtained from the Contracting Officer. In such cases, a list of data to be submitted later shall be included with the first submission. Detail drawings shall show physical arrangement, construction details, connections, finishes, materials used in fabrication, provisions for conduit or busway entrance, access requirements for installation and maintenance, physical size, electrical characteristics, foundation and support details, and equipment weight. Drawings shall be drawn to scale and/or dimensioned. Optional items shall be clearly identified as included or excluded. Detail drawings shall as a minimum include:

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a. Incoming line and station bus structures and integral equipment.

b. Transformers.

c. Switchgear.

d. Battery system including calculations for the battery and charger.

e. Voltage regulators.

f. Grounding resistors.

g. Station single line electrical diagrams including primary, metering, sensing and relaying, control wiring, and control logic.

h. Structural or physical features of major items of station equipment and components of equipment or equipment assemblies and structures, including foundations or other types of supports for equipment and conductors. Those structural drawings shall include accurately scaled or dimensioned outline and arrangement or layout drawings to show the physical size of station equipment and component parts of the equipment and the relative arrangement of components and any physical connection of related components. Weights of equipment and components of equipment assemblies shall be provided when required to verify the adequacy of design and proposed construction of foundations or other types of supports. Dynamic forces shall be stated for switching devices when such forces must be considered in the design of support structures. The appropriate detail drawings shall show the provisions for leveling, anchoring, and connecting all items of station equipment during installation, and shall include any recommendations made by the manufacturer of the equipment.

i. Electrical drawings shall include single-line and three-line diagrams of the station and station equipment, schematics or elementary diagrams of each electrical system; internal wiring and external connection diagrams of each electrical device when published by the manufacturer; wiring diagrams of cabinets, panels, units, or other separate mountings; interconnection diagrams that show the wiring between separate components of assemblies; external connection diagrams that show the termination of wiring routed between separate items of station equipment; internal wiring diagrams of equipment showing wiring as actually provided for this project. External wiring connections shall be clearly identified.

j. If departures from the contract drawings are deemed necessary, submit complete details of such departures, including changes in related portions of the project and the reasons therefore. Approved departures shall be made at no additional cost to the Government.

1.2.4 As-Built Drawings

The as-built drawings shall be kept at the job site and updated daily.

The as-built drawings shall be a full sized set of prints marked to reflect all deviations, modifications, and changes. The as-built drawings shall be complete and show the location, size, dimensions, part identification, and other information. Additional sheets may be added.

The as-built drawings shall be jointly inspected for accuracy and completeness by the Contractor's quality control representative and by the Contracting Officer prior to the submission of each monthly pay estimate.

Upon completion of the work, submit three full sized sets of the marked prints to the Contracting Officer for approval. Keep as-built drawings prepared as a record of the construction as installed. Include in the drawings all the information shown on the contract drawings as well as all deviations, modifications, and changes from the contract drawings, however minor. If upon review, the as-built drawings are found to contain errors

26 11 14.00 10 – Page 6 of 22 and/or omissions, they will be returned to the Contractor for correction.

Correct and return the as-built drawings to the Contracting Officer for approval within ten calendar days from the time the drawings are returned to the Contractor.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Detail Drawings; G As-Built Drawings

SD-03 Product Data

Materials and Equipment Support Structures; G Fault Current Analysis Coordination Study Medium Voltage Circuit Breakers Protective Relay Style Number Worksheets; G Battery; G Battery Charger; G Nameplates Onsite Tests Procedures; G

SD-06 Test Reports

Factory Tests Field Testing Field Test Reports NETA Acceptance Tests Protective Relay Tests

SD-10 Operation and Maintenance Data

Operation and Maintenance Manuals; G

1.4 DELIVERY, STORAGE, AND HANDLING

Visually inspect devices and equipment when received and prior to acceptance from conveyance. Protect stored items from the environment in accordance with the manufacturer's published instructions. Replace damaged items. Oil filled transformers and switches shall be stored in accordance with the manufacturer's requirements.

1.5 EXTRA MATERIALS

One additional spare fuse or fuse element for each furnished fuse or fuse element shall be delivered to the Contracting Officer when the electrical system is accepted. Provide two complete sets of all special tools required for maintenance, complete with a suitable tool box. Special tools are those that only the manufacturer provides, for special purposes (to access compartments, or operate, adjust, or maintain special parts).

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PART 2 PRODUCTS

2.1 MATERIALS AND EQUIPMENT

Provide materials and equipment which are the standard product of a manufacturer regularly engaged in the manufacture of the product and that essentially duplicate items that have been in satisfactory use for at least 2 years prior to bid opening.

a. Submit a complete itemized listing of equipment and materials proposed for incorporation into the work. Each entry shall include an item number, the quantity of items proposed, and the name of the manufacturer of each such item. Products shall conform to the following requirements. Items of the same classification shall be identical including equipment, assemblies, parts, and components.

b. Where materials or equipment are specified to conform to the standards of the Underwriters Laboratories, Inc., (UL) or to be constructed or tested, or both, in accordance with the standards of the American National Standards Institute (ANSI), the Institute of Electrical and Electronics Engineers (IEEE), or the National Electrical Manufacturers Association (NEMA), submit proof that the items provided under this section of the specifications conform to such requirements.

c. The label of, or listing by, UL will be acceptable evidence that the items conform thereto. Either a certification or a published catalog specification data statement, to the effect that the item is in accordance with the referenced ANSI or IEEE standard, will be acceptable evidence that the item conforms thereto. A similar certification or published catalog specification data statement to the effect that the item is in accordance with the referenced NEMA standard, by a company listed as a member company of NEMA, will be acceptable evidence that the item conforms thereto.

d. In lieu of such certification or published data, the Contractor may submit a certificate from a recognized testing agency equipped and competent to perform such services, stating that the items have been tested and that they conform to the requirements listed, including methods of testing of the specified agencies. Compliance with above-named requirements does not relieve the Contractor from compliance with any other requirements of the specifications.

2.2 NAMEPLATES

Submit data composed of catalog cuts, brochures, circulars, specifications, product data, and printed information in sufficient detail and scope to verify compliance with the requirements of the contract documents.

2.2.1 General

Each major component of this specification shall have the manufacturer's name, address, type or style, model or serial number, and catalog number on a nameplate securely attached to the equipment. Nameplates shall be made of noncorrosive metal. As a minimum, provide nameplates for transformers, regulators, circuit breakers, capacitors, meters, switches, switchgear, and grounding resistors.

2.2.2 Liquid-Filled Transformer Nameplates

Provide power transformers, with Nameplate C information in accordance

26 11 14.00 10 – Page 8 of 22 with IEEE C57.12.00, indicating the number of gallons and composition of liquid-dielectric, permanently marked with a statement that the transformer dielectric to be supplied is non-polychlorinated biphenyl. If transformer nameplate is not so marked, furnish manufacturer's certification for each transformer that the dielectric is non-PCB classified, with less than 2 ppm PCB content in accordance with paragraph MISCELLANEOUS Liquid Dielectrics. Certifications shall be related to serial numbers on transformer nameplates. Transformer dielectric exceeding the 2 ppm PCB content or transformers without certification will be considered as PCB insulated and will not be accepted.

2.2.3 Liquid-filled Voltage Regulator Nameplates

Provide voltage regulators with two nameplates with all information in accordance with IEEE C57.15. Nameplates shall be stainless steel.

Nameplates shall indicate the number of gallons and composition of the liquid dielectric, and be permanently marked with a statement that the liquid dielectric contains no detectable level (i.e., less than 2 ppm) of PCBs (polychlorinated biphenyls) at the time of manufacture. If the naameplates are not so marked, then the voltage regulators will be considered as PCB insulated or contaminated, and will not be accepted.

2.3 CORROSION PROTECTION

Equipment and component items not hot-dip galvanized or porcelain enamel finished shall be provided with corrosion-resistant finishes. Provide corrosion resistant baked dry powder coat finish for all surfaces. All exterior surfaces shall be ANSI 61 gray. Switchgear compartment interior surfaces shall be white.

2.4 MAIN SUBSTATION AND SWITCHING STATION

Provide substation support structures, voltage regulator, bypass and interrupter switches, and associated buswork and hardware, and outdoor switchgear extension at the existing Gingko Substation.

2.4.1 Support Structures

Provide structures as shown to support incoming line conductors, switches, instrument transformers, air terminals and aerial buses. Steel structural items shall conform to Section 05 50 13 MISCELLANEOUS METAL FABRICATIONS.

Structures shall be of the low-profile type. Structures shall utilize round or rectangular tubular steel construction or equivalent H/I-beam support elements. Lattice type supports for new structures are not acceptable. Submit manufacturer's design analysis and calculations for structures, foundations, anchor bolts, and supports differing from those indicated in the contract drawings. Calculations shall be made by a registered professional engineer with demonstrated experience in substation structural design in the last three years. The manufacturer shall provide a list of projects complete with points of contact, addresses and telephone numbers. Structural steel and miscellaneous items shall comply with ASTM A36/A36M, ASTM A572/A572M, ASTM A575, ASTM A576or ASTM A633/A633M, or equivalent aluminum. General configurations are indicated. Exact dimensions and arrangements may be varied, dependent upon site limitations, to permit use of a manufacturer's standard equipment and structures. Steel structures shall be hot-dip galvanized in accordance with ASTM A123/A123M after drilling is completed and shall not be painted. Air terminals, not less than 6 feet in length, shall be provided on each structure column for lightning protection.

2.4.2 Conductors

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Conductors shall be aluminum-conductor-steel-reinforced (ACSR) with sizes as indicated, and shall comply with IEEE 525. The overhead line conductor for the Main-to-Gingko tie line is 795 kcmil ACSR (bare conductor)(1 per phase). The underground portions of the same line will be 500 kcmil MV-105 copper conductors (2 per phase). Base span lengths on a limiting deflection of 1/150 for spans having two supports and 1/200 forspans having three supports, under maximum wind, ice, and short-circuit loadings, including suitable allowances for any taps. Where required, install larger or stronger bus to maintain specified deflections for the indicated span lengths. Other bus shapes for electrical conductors may be used if detail drawing submittals indicate equivalent ampacity and strength. Short connections, consisting of bare stranded conductors of equivalent bus ampacity, may be used between incoming line conductors and buses or between buses and equipment. Copper flexible braid or aluminum strap expansion couplers, as required to match the bus material, shall be installed in bus runs where required to allow for expansion and contraction, and at all connections to transformer bushings.

2.4.2.1 Suspension Insulators

Provide polymer suspension insulators (ANSI/NEMA C29.12) for dead-ending incoming line conductors. Suspension insulators shall match insulators used for pole-mounted deadends as indicated on the drawings and specified in Section 33 71 01.00 40 OVERHEAD

ELECTRICAL DISTRIBUTION.

2.4.2.2 Apparatus Post Insulators

ANSI C29.9. Polymer post insulators shall be provided to support conductors on low-profile structures, and their mechanical strength shall exceed the ultimate strength of the conductor supported. Where necessary, high-strength or ultra-high-strength insulators shall be provided.

2.4.2.3 Pin Insulators

ANSI C29.9. ANSI/NEMA C29.12 Polymer pin insulators shall be provided to support conductors on existing lattice type structures.

2.5 SUBSTATION EQUIPMENT

2.5.1 Outdoor 3-Phase Voltage Regulators

Voltage regulators shall comply with IEEE C57.15 and shall be of the outdoor, self-cooled, three-phase station-type. Single-phase units are not acceptable. When operating under load, the regulator shall provide plus and minus 10 percent automatic voltage regulation in approximately 5/8 percent steps, with 16 steps above and 16 steps below rated voltage.

Automatic control equipment for load tap changing (LTC) shall provide Class 1 accuracy. Bypass surge arresters shall be suitable for an ungrounded system and for the associated regulator voltage. Distribution class surge arresters shall be mounted next to each incoming line bushing on a regulator tank-mounted bracket and connected to a surge arrester ground pad-mounted on the regulator tank. Voltage regulator shall be Virginia Transformer Corporation 3-phase, substation type, or approved equal. Voltage regulator shall conform to the features provided for the existing voltage regulator SL# 44002MA001U-HA176 at the site, except that both the main tank and the LTC tank shall be filled with less-flammable Envirotemp FR3 fluid.

2.5.1.1 Ratings and Construction

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Rated voltage: 13,800 volts +/- 10 percent, 3-phase, 60 Hertz BIL: 110 kV kVA: 2100/2800 kVA, 65 C temperature rise, KNAN/KNAF Winding material: Copper

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Insulating fluid: Envirotemp FR3 (main tank) Insulating fluid: Envirotemp FR3 (LTC tank) Tank finish: ANSI 70 light gray

2.5.1.2 Bypass and Isolation Switches

Switches shall be of the outdoor, hookstick-operated, single-pole, single-throw, vertical-break type suitable for the indicted mounting. One switch stick of adequate length shall be provided. Switch shall consist of two disconnect switches plus one bypass switch mounted on a common base. Switch shall be of a type designed to provide bypass of a single-phase regulator circuit by an integral sequence which always occurs when each switch is opened or closed. Switch shall be Hubbell BP3-A7 or approved equal Ratings at 60 Hz shall be in accordance with IEEE C37.41 and as follows:

Maximum voltage: 25 kV Operating voltage: 13.8 kV BIL: 150 kV Peak Withstand current: 65 kA Continuous current: 900 amperes, make or break

2.5.1.3 Miscellaneous

Standard accessories and components in accordance with IEEE C57.15 shall be provided. The regulator subbase shall elevate the lowest live part of the regulator to a height of at least 9 feet above the concrete pad on which it is mounted.

Provide cover mounted 13,800-120 volt potential transformer (PT) with dual high voltage fuses. Provide cover-mounted 13,800-240/120 volt control power transformer (CPT) with dual high voltage bushings. PT and CPT secondaries shall be factory wired into the voltage regulator control cabinets. Provide transmitter for remote digital indication of tap position.

2.5.2 Not Used

2.6 METAL-CLAD SWITCHGEAR

Switchgear shall be indoor, two-high, metal-clad type conforming to IEEE C37.20.2. Switchgear shall be Eaton VCP-W or approved equal.

Switchgear shall have relaying, metering, instrument transformers, and control devices as shown.

2.6.1 Ratings

Switchgear ratings shall be in accordance with IEEE C37.06, IEEE C37.04, and as follows:

Rated maximum voltage............................15 kV Frequency........................................60 Hz BIL..............................................60 kV Maximum symmetrical interrupting current.........50 kA Maximum close and latch current, peak...........130 kA Continuous current...........................2000 amps

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2.6.2 Medium Voltage Circuit Breakers

Circuit breakers shall be drawout vacuum-type rated for 1200 amps continuous current. Breakers shall be Eaton VCP-W or approved equal.

Circuit breaker control voltage shall be 125 V dc.

Instrument transformers shall comply with IEEE C57.13. Instrument transformers shall be configured for mounting in/on the device to which they are applied. Polarity marks on instrument transformers shall be visually evident and shown on drawings.

2.6.3 Instrument Transformers

Instrument transformers (current and voltage) shall comply with IEEE C57.13.

Instrument transformers shall be configured for mounting in/on the device to which they are applied. Polarity marks on instrument transformers shall be visually evident and shown on drawings.

2.6.4 Protective Relays

Protective relays shall be digital, multi-function type conforming to IEEE C37.90. Provide protective relays as indicated. Feeder protective relays (FPRs) shall be Schweitzer SEL 751 with front target indicators, pushbuttons, relay inputs and relay outputs programmed as indicated on the drawings. Submit protective relay style number worksheets for each relay.

2.6.5 Metering Units

Metering units shall be electronic power meters with triple LED display and integral navigation/function switches, nominal 4 x 4 inch size. Meter accuracy shall be 0.2 percent conforming to NEMA C12.20. The use of separate meter selector switches is not permitted. Metering units shall be Eaton IQ-250 or approved equal.

2.6.6 Control Switches

Control switches shall be Electroswitch Series 24 with red and green LED indicating lamps (for breaker closed and open indication) mounted on the escutcheon.

2.6.7 Test Switches

Test blocks and their associated testing accessories shall be provided for testing of protective relays and metering units.

2.6.8 Duplex Receptacles

Duplex receptacles shall be installed on the front door of each lower compartment. Receptacles shall be NEMA 5-20R type with gray face and stainless steel cover plate.

2.6.9 Surge Arresters

Surge arresters shall conform to IEEE C62.11 and shall be provided as indicated. Arresters shall be distribution class, rated as shown.

Arresters shall be equipped with mounting brackets for the indicated installations. Arresters shall be of the metal-oxide varistor type.

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2.6.10 Accessories

Accessories shall be provided for the inspection, testing, maintenance, and repair of circuit breakers, and shall include one set of any special tools, as necessary to repair and maintain circuit breakers and major switchgear components. Maintenance and testing accessories shall include, but are not limited to the following:

a. Portable gear motor for electric-power positioning of circuit breakers, if required by the breaker design.

b. Secondary test coupler for testing of drawout circuit breakers in the test position.

c. Hand crank for positioning of circuit breakers.

d. Transfer truck, for movement of circuit breaker units.

e. Test cabinet for closing and tripping of circuit breakers by electrical control operations.

f. Lifting and transfer device for two-high circuit breaker units.

2.7 NOT USED

2.8 SWITCHGEAR BUILDING EXTENSION

Expand the existing Gingko Substation switchgear building by two bays as indicated. Provide indoor 3-phase automatic transfer switch for building auxiliary power circuit as indicated.

2.9 CABINETS AND ENCLOSURES

Cabinets and enclosures shall comply with NEMA 250 and shall be of galvanized steel, shall be provided with hinged doors, and shall be suitable for indoor or outdoor installation as indicated. Where locations are not indicated, cabinets shall be suitable for outdoor installation.

Thickness of metal and outdoor construction shall be in accordance with UL 50. An indoor cabinet exterior shall have one finish coat and an outdoor cabinet exterior shall have two finish coats. Finish colors shall be manufacturer's standard dark gray or sky gray for outdoor cabinets and light gray for indoor cabinets, unless otherwise specified. The finish color of outdoor equipment shall be the same unless otherwise approved.

Finish coats shall be applied over a prepared substrate. Each cabinet shall be a freestanding type or may be supported by attachment to an enclosure fence or a switchgear interior wall where located adjacent thereto. A concrete pad shall be provided to support any outdoor cabinet whose base extends to within 3 inches of grade level and pads shall extend at least 4 inches below grade.

2.10 MISCELLANEOUS

2.10.1 NOT USED

2.10.2 Wiring

Solid wiring may be used for convenience outlets, heating elements, and lighting circuits. Otherwise, the minimum class of stranding shall be Class C. Class K stranding shall be used for wiring between items of equipment mounted on swinging panels or doors and items mounted on fixed panels or parts of fixed assemblies. The insulation type shall be the type SIS unless otherwise specified, indicated, or proposed and approved for use. The minimum wire gauge shall be No. 12 AWG. All wiring shall be rated for 600 volts ac and 250 volts dc. Current transformer circuit

26 11 14.00 10 – Page 13 of 22 wiring shall be not less than No. 10 AWG. Wiring for Close and Trip circuits shall be not less than No. 12 AWG. Wire markers shall be affixed to each end of wires and shall contain wire number or designations shown on contract or detail drawings, or as otherwise approved. Wire numbers shall also be permanently marked on terminal block marking strips where wires are connected. Only insulated-barrel, crimp-type, ring lugs shall be used.

2.10.3 Single-Line Electrical Diagram

A single-line electrical diagram of the station shall be provided. The diagram shall be enclosed between matte-surface thermoplastic sheets buttoned or otherwise suitably fastened together to allow easy access to the diagram for making any future changes. The diagram shall be suitable for outdoor mounting and shall be approximately 14 by 21 inches unless another size is approved. The diagram shall be attached with temperature-and moisture-resistant, pressure-sensitive adhesive or with other suitable means to the indicated location at the metal-clad switchgear lineup, except when otherwise shown or directed.

2.10.4 Danger Signs

One danger sign inscribed "DANGER-HIGH VOLTAGE" shall be permanently and securely mounted approximately 5 feet above finished grade on each outward side of the fence enclosure. Fasteners shall be of stainless steel.

Signs shall be of metal and shall have letters of at least 3 inches in height. Voltage warning signs shall comply with IEEE C2.

2.10.5 Conduits, Rigid Metal

Outdoor conduits shall be galvanized rigid steel complying with UL 6.

Indoor conduits shall be electrical metallic tubing (EMT) complying with

UL 797.

2.10.6 Hardware

Ferrous metal threaded items shall comply with ASTM A153/A153M and miscellaneous nonthreaded items shall comply with ASTM A123/A123M. Other equivalent protective treatment, as required by ASTM A123/A123M or ASTM A153/A153M, or ferrous metals designed to meet ASTM Standards covering corrosion-resisting steel, will be permitted if approved in writing.

2.10.7 Panelboards, Circuit-Breaker Type

Panelboards shall comply with NEMA PB 1, UL 50 and UL 67.

2.11 GROUNDING AND BONDING

2.11.1 Driven Ground Rods

Ground rods shall be copper-clad steel conforming to UL 467 not less than 3/4 inch in diameter by 10 feet in length.

2.11.2 Grounding Conductors

Grounding conductors shall be bare, except where installed in conduit with associated phase conductors. Insulated conductors shall be of the same material as the phase conductors and green color-coded, except that

26 11 14.00 10 – Page 14 of 22 conductors shall be rated no more than 600 volts. Bare conductors shall be ASTM B8 soft-drawn unless otherwise indicated. Aluminum is not acceptable.

2.12 SURGE ARRESTERS

Surge arresters shall comply with NEMA LA 1, and IEEE C62.11, and shall be provided as indicated. Arresters shall be distribution class, metal-oxide varistor type, rated as shown. Arresters shall be equipped with mounting brackets for the indicated installations. .

2.13 COORDINATED POWER SYSTEM PROTECTION

Analyses shall be prepared to demonstrate that the equipment selected and system constructed meet the contract requirements for equipment ratings, coordination, and protection. They shall include a load flow analysis, a fault current analysis, and a protective device coordination study. The studies shall be performed by a registered professional engineer with demonstrated experience in power system coordination in the last three years. Provide a list of references complete with points of contact, addresses, and telephone numbers. The selection of the engineer is subject to the approval of the Contracting Officer.

2.13.1 Scope of Analyses

The fault current analysis, and protective device coordination study shall begin at: the source bus and extended through medium voltage feeders installed or modified under this project, and extended through to the secondary side of transformers connected to these medium voltage feeders.

2.13.2 Determination of Facts

The time-current characteristics, features, and nameplate data for each existing protective device shall be determined and documented. Coordinate with the commercial power company for fault current availability at the site.

2.13.3 Single Line Diagram

A single line diagram shall be prepared to show the electrical system buses, devices, transformation points, and all sources of fault current (including generator and motor contributions). A fault-impedance diagram or a computer analysis diagram may be provided. Each bus, device, or transformation point shall have a unique identifier. If a fault-impedance diagram is provided, impedance data shall be shown. Locations of switches, breakers, and circuit interrupting devices shall be shown on the diagram together with available fault data, and the device interrupting rating.

2.13.4 Fault Current Analysis

2.13.4.1 Method

The fault current analysis shall be performed in accordance with methods described in IEEE 242, and IEEE 399.

2.13.4.2 Data

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Actual data shall be utilized in fault calculations. Bus characteristics and transformer impedances shall be those proposed. Data shall be documented in the report.

2.13.4.3 Fault Current Availability

Balanced three-phase fault, bolted line-to-line, and line-to-ground fault current values shall be provided at each voltage transformation point and at each power distribution bus. The maximum and minimum values of fault available at each location shall be shown in tabular form on the diagram or in the report.

2.13.5 Coordination Study

Submit Coordination Study along with protective device equipment submittals. No time extensions or similar contract modifications will be granted for work arising out of the requirements for this study. Approval of protective devices proposed shall be based on recommendations of this study. The Government will not be held responsible for any changes to equipment, device ratings, settings, or additional labor for installation of equipment or devices ordered and/or procured prior to approval of the study. The study shall demonstrate that the maximum possible degree of selectivity has been obtained between devices specified, consistent with protection of equipment and conductors from damage from overloads and fault conditions. The study shall include a description of the coordination of the protective devices in this project. Provide a written narrative that describes: which devices may operate in the event of a fault at each bus; the logic used to arrive at device ratings and settings; situations where system coordination is not achievable due to device limitations (an analysis of any device curves which overlap);

coordination between upstream and downstream devices; and relay settings.

Recommendations to improve or enhance system reliability, and detail where such changes would involve additions or modifications to the contract and cost changes (addition or reduction) shall be provided. Composite coordination plots shall be provided on log-log graph paper.

2.13.6 Study Report

a. The report shall include a narrative describing: the analyses performed; the bases and methods used; and the desired method of coordinated protection of the power system.

b. The study shall include descriptive and technical data for existing devices and new protective devices proposed. The data shall include manufacturers published data, nameplate data, and definition of the fixed or adjustable features of the existing or new protective devices.

c. The report shall document utility company data including system voltages, fault MVA, system X/R ratio, time-current characteristic curves, current transformer ratios, and relay device numbers and settings; and existing power system data including time-current characteristic curves and protective device ratings and settings.

d. The report shall contain fully coordinated composite time-current characteristic curves for each bus in the system, as required to ensure coordinated power system protection between protective devices or equipment. The report shall include recommended ratings and settings of all protective devices in tabulated form.

e. The report shall provide the calculations performed for the analyses, 26 11 14.00 10 – Page 16 of 22 including computer analysis programs utilized. The name of the software package, developer, and version number shall be provided.

2.14 FACTORY TESTS

Factory tests shall be performed, as follows, in accordance with the applicable publications and with other requirements of these specifications. The Contracting Officer shall be notified at least 10 days before the equipment is ready for testing. The Contracting Officer reserves the right to witness the tests.

2.14.1 High-Voltage Circuit Breakers

Manufacturer's standard tests in accordance with IEEE C37.09 and

IEEE C37.081.

2.14.2 High-Voltage Air Switches

Manufacturer's standard tests in accordance with IEEE C37.34 and

IEEE C37.41.

2.14.3 Protective Relays

Seismic tests in accordance with IEC 60255-21-3. Surge withstand tests in accordance with IEEE C37.90.1.

2.14.4 Relaying Current Transformers

Manufacturer's standard tests in accordance with IEEE C57.13.

2.14.5 Instrument Current Transformers

Manufacturer's standard tests in accordance with IEEE C57.13.

2.14.6 Voltage Regulators

Manufacturer's standard tests in accordance with IEEE C57.15.

2.14.7 High-Voltage Fuses

Manufacturer's standard tests in accordance with IEEE C37.41.

2.14.8 Factory Test Submittal Package

Submit 6 copies of the information described below in 8-1/2 by 11 inch binders having a minimum of 5 rings from which material may readily be removed and replaced, including a separate section for each test.

Sections shall be separated by heavy plastic dividers with tabs.

a. A list of all equipment used, with calibration certifications.

b. A copy of all measurements taken.

c. The dates of testing.

d. The equipment and values to be verified.

e. The condition specified for the test.

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f. The test results, signed and dated.

g. A description of all adjustments made.

PART 3 EXECUTION

3.1 EXAMINATION

After becoming familiar with details of the work, verify dimensions in the field, and notify the Contracting Officer of any discrepancy before performing any work.

3.2 GENERAL INSTALLATION REQUIREMENTS

Install and energize equipment and devices in accordance with the manufacturer's published instructions. Submit installation procedures for station buses and insulators, station structures, transformers, switchgear, battery system, voltage regulators and grounding resistors, as a minimum. Procedures shall include diagrams, instructions, and precautions required to install, adjust, calibrate, and test the devices and equipment. Circuits installed in conduits or underground and splices and terminations for medium-voltage cable shall conform to the requirements of Section 33 71 02 UNDERGROUND ELECTRICAL DISTRIBUTION.

Secondary circuits installed in conduit on poles shall conform to the requirements of Section 26 20 00 ELECTRICAL DISTRIBUTION SYSTEM.

3.2.1 Conformance to Codes

The installation shall comply with the requirements and recommendations of NFPA 70 and IEEE C2.

3.2.2 Concrete Foundations

Construct foundations and pads for electrical equipment as indicated.

Tops of concrete pads shall be level. Set conduits for primary, secondary, and grounding conductors in place prior to placing of concrete pads. Concrete work shall comply with the requirements of Section 03 30 53

MISCELLANEOUS CAST-IN-PLACE CONCRETE.

3.2.3 Field Welding

Procedures and welders shall be qualified in accordance with AWS D1.1/D1.1M for structural welding and ASME BPVC SEC IX for welding of equipment.

Welding procedures qualified by others, and welders and welding operators qualified by a previously qualified employer may be accepted as permitted by ASME B31.3. Notify the Contracting Officer 24 hours in advance of tests; perform the tests at the work site if practical. The Contracting Officer shall be provided with a copy of qualifying procedures and a list of names and identification symbols of qualified welders and welding operators. The welder or welding operator shall apply his assigned symbol near each weld he makes as a permanent record.

3.2.4 Connections to Utility Lines

Coordinate the work with the Contracting Officer and provide final connections to the utility electric lines.

3.2.5 Disposal of Liquid Dielectrics

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PCB contaminated dielectrics must be marked as PCB and transported to and incinerated by an approved EPA waste disposal facility. Furnish certification of proper disposal. Contaminated dielectric shall not be diluted to lower the contamination level.

3.3 EQUIPMENT INSTALLATION

3.3.1 Equipment Finishes

Equipment shall be carefully installed so as not to scratch finishes.

After installation, finished surfaces shall be inspected and scratches touched up with a finish provided by the manufacturer especially for this purpose.

3.3.2 Supports

Install enclosures and enclosure supports in accordance with manufacturer's instructions. Supports shall consist of anchored channels leveled and then embedded in the concrete foundation. Channels, anchors, shims, or other leveling items shall be installed in accordance with the recommendations of the equipment manufacturer.

3.3.3 Switchgear Leveling

After leveling items are correctly installed, switchgear lineups shall be out-of-plumb by not more than 1/4 inch for the entire length and width.

Insertion or withdrawal of removable elements shall be easily accomplished, and component devices shall operate properly after the switchgear assembly is completely installed.

3.4 ELECTRICAL BUS CONNECTIONS

All connections to aluminum bus shall be cleaned and coated with an inhibitor in accordance with manufacturer's recommended methods. All bolted connections shall be torqued to the correct tightness. Establish a checklist to insure that bolted connections have been properly coated and correctly torqued. All welded connections on aluminum buswork shall be by the gas metal-arc welding process. The shield inert gas shall be argon.

The welder shall be certified for gas metal-arc welding.

3.5 GROUNDING

A grounding loop consisting 4/0 AWG bare copper conductors and driven ground rods shall be installed around switchgear, pad-mounted transformers, outdoor circuit breakers, and voltage regulators.

Grounding grid shall comply with IEEE 80. Equipment frames of metal-enclosed equipment, medium-voltage cable terminations, chain-link fencing, metal-structures, and other noncurrent-carrying metal items shall be connected to the ground grid as shown. At least two connections shall be provided from a switchgear ground bus, an outdoor circuit breaker enclosure, a voltage regulator, and a steel switch operating platform to the ground grid. Fences shall be grounded at each fixed gate post, each corner post, and at intermediate posts as indicated. Each gate section shall be bonded to its gate posts with a 1/8 by 1 inch flexible braided copper strap and ground post clamps. Fence ground clamps shall be of a type that inhibits corrosion between metal parts.

3.5.1 Ground Rods

Ground rods shall be driven into the earth until the tops of the rods are

26 11 14.00 10 – Page 19 of 22 approximately one foot below finished grade. Ground loop conductors shall be bonded to all ground rods.

3.5.2 Grounding and Bonding Connections

Connections above grade shall be made with bolted solderless connectors, in compliance with UL 467, and those below grade shall be made by the exothermic welding process. Where grounding conductors are connected to aluminum-composition conductors, specially treated or lined copper-to-aluminum connectors suitable for this purpose shall be used.

3.5.3 Grounding and Bonding Conductors

Grounding and bonding conductors include all conductors used to bond transformer enclosures, equipment frames and structural members to the grounding grid. Grounding and bonding conductors shall be sized as shown.

After being located to provide maximum physical protection, exposed grounding conductors shall be securely attached to structural supports at not more than two foot intervals with suitable fasteners.

Bends greater than 45 degrees in ground conductors are not permitted.

Routing of ground conductors through concrete should be avoided. When concrete penetration is necessary, nonmetallic conduit shall be cast flush with the points of concrete entrance and exit so as to provide an opening for the ground conductor, and the opening shall be sealed with a suitable compound after installation.

3.5.4 Surge Arrester Grounding

Surge arresters and neutrals shall be bonded directly to the transformer enclosure and then to the grounding grid with a bare copper conductor, minimum size #2 AWG. Lead lengths shall be kept as short as practicable with no kinks or sharp bends.

3.6 TRAINING

Conduct a training course for the operating staff as designated by the Contracting Officer. The training period will consist of a total of 8 hours of normal working time and shall start after the system is functionally completed but prior to final acceptance tests. The course instruction shall cover pertinent points involved in operating, starting, stopping, servicing the equipment, as well as all major elements of the operation and maintenance manuals. Additionally, the course instructions shall demonstrate all routine maintenance operations.

a. Submit 6 copies of operation and maintenance manuals, within 7 calendar days following the completion of tests and including assembly, installation, operation and maintenance instructions, spare parts data which provides supplier name, current cost, catalog order number, and a recommended list of spare parts to be stocked.

b. Manuals shall also include data outlining detailed procedures for system startup and operation, and a troubleshooting guide which lists possible operational problems and corrective action to be taken. A brief description of all equipment, basic operating features, and routine maintenance requirements shall also be included. Documents shall be bound in a binder marked or identified on the spine and front cover. A table of contents page shall be included and marked with pertinent contract information and contents of the manual. Tabs shall be provided to separate different types of documents, such as catalog

26 11 14.00 10 – Page 20 of 22 ordering information, drawings, instructions, and spare-parts data.

Index sheets shall be provided for each section of the manual when warranted by the quantity of documents included under separate tabs or dividers.

c. Submit a digital video recording of the entire training session and three additional copies of the instructions manual within 30 days following the approval of the manuals.

3.7 FIELD TESTING

3.7.1 General

a. Submit a detailed description of the Contractor's proposed procedures for onsite tests submitted 30 days prior to testing the installed system. No field test will be performed until the test plan is approved. The test plan shall consist of complete field test procedures including tests to be performed, test equipment required, and tolerance limits.

b. Field testing shall be performed in the presence of the Contracting

Officer. Notify the Contracting Officer 7 days prior to conducting tests. Furnish all materials, labor, and equipment necessary to conduct field tests. Perform all tests and inspections recommended by the manufacturer unless specifically waived by the Contracting Officer. Maintain a written record of all tests which includes date, test performed, personnel involved, devices tested, serial number and name of test equipment, and test results.

c. All field test reports will be signed and dated by the Contractor.

Submit 6 copies of the information described below in 8-1/2 by 11 inch binders having a minimum of 5 rings from which material may readily be removed and replaced, including a separate section for each test.

Sections shall be separated by heavy plastic dividers with tabs.

(1) A list of all equipment used, with calibration certifications.

(2) A copy of all measurements taken.

(3) The dates of testing.

(4) The equipment and values verified.

(5) The condition specified for the test.

(6) The test results, signed and dated.

(7) A description of all adjustments made.

(8) Final position of controls, and device settings.

d. Tests shall be performed by an independent third party.

3.7.2 Safety

Provide and use safety devices such as rubber gloves, protective barriers, and danger signs to protect and warn personnel in the test vicinity.

Replace any devices or equipment which are damaged due to improper test procedures or handling.

3.7.3 Ground-Resistance Tests

The resistance of each grounding electrode shall be measured using the fall-of-potential method defined in IEEE 81.