Amend 0004_26 25 00.00 26.pdf

PH1 Cubicle Room 15kV Switchgear Upgrade, Fort Peck Dam, MT FP66

SECTION TABLE OF CONTENTS

DIVISION 26 - ELECTRICAL

SECTION 26 25 00.00 26

BUS STRUCTURES

PART 1 GENERAL

1.1 DESCRIPTION

1.2 REFERENCES

1.3 SUBMITTALS

1.4 GENERAL REQUIREMENTS

1.4.1 General

1.4.2 Materials, Equipment and Installation

1.4.3 Standard Products

1.4.4 Corrosion Prevention

1.4.4.1 General

1.4.4.2 Fastenings and Fittings

1.4.4.3 Corrosion-Resisting Materials

1.4.4.4 Corrosion-Resisting Treatments

1.4.4.5 Finish

1.4.5 Storage and Handling

1.5 QUALIFICATIONS

PART 2 PRODUCTS

2.1 GENERAL

2.2 BUS CONDUCTORS

2.3 BUS SUPPORTS

2.4 BONDING

2.5 THREADED CONNECTIONS

2.6 PAINT

2.7 SEGREGATED PHASE BUS

2.7.1 Rating

2.7.2 Insulation Boots

2.7.3 Bus Insulation

2.7.4 Inspection Cover Plates

2.7.5 Transition Compartments

2.8 ACCESSORIES

2.9 SPARE PARTS

2.10 Shop Drawings

PART 3 EXECUTION

3.1 GENERAL

3.1.1 General

3.1.2 Segregated Phase Bus Installation and Field Tests

3.1.3 Design and Manufacturing Coordination

3.2 PAINTING

3.2.1 New Equipment

3.2.2 Existing Equipment

3.3 DISPOSAL OF REMOVED EQUIPMENT

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Am-0004

3.4 FACTORY INSPECTION AND TESTS

3.4.1 General

3.4.2 Metal-Enclosed Bus Design Tests

3.4.3 Factory Inspection and TestsSegregated Phase Bus

3.5 INSTALLATION PLAN AND SCHEDULE

3.6 QUALIFICATIONS OF FIELD ENGINEERING SERVICE PERSONNEL

3.7 COMMISSIONING

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SECTION 26 25 00.00 26 Page 2

SECTION 26 25 00.00 26

BUS STRUCTURES

PART 1 GENERAL

1.1 DESCRIPTION

This section specifies that the Contractor must furnish all supervision, engineering, testing, labor, materials, plant and equipment to perform the following work in strict accordance with the detailed requirements of the specifications and drawings listed on the contract drawings.

a. Design, manufacture, ship, field test, and include all accessories, and install the 15 kV segregated metal enclosed bus.

The buses and all support frames, gaskets, covers, and structural supports required for mounting the buses must be supplied for a completely coordinated connection system under this contract. The removal and disposal of the sections of existing bus and the installation of the new bus with structural supports must be done by the Contractor, as required.

1.2 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.

ASME INTERNATIONAL (ASME)

ASME B1.1 (2003; R 2018) Unified Inch Screw Threads (UN and UNR Thread Form)

ASME B1.20.1 (2013; R 2018) Pipe Threads, General Purpose (Inch)

ASTM INTERNATIONAL (ASTM)

ASTM A123/A123M (2017) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A153/A153M (2016a) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE C2 (2023) National Electrical Safety Code

IEEE C37.20.2 (2015) Standard for Metal-Clad Switchgear

IEEE C37.23 (2015) Standard for Metal-Enclosed Bus

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NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2023) National Electrical Code

1.3 SUBMITTALS

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

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following must be submitted in accordance with SECTION 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Qualifications Of Field Engineering Service Personnel; G, HDC

SD-02 Shop Drawings

Submit items below within 45 days after receipt of Notice to Proceed.

Outline Drawings; G, HDC

Shop Drawings; G, HDC

Assembly and Detail Drawings; G, HDC

Correspondence Records; G, HDC

Within 120 calendar days after date of receipt of Notice to Proceed, provide six (6) copies of assembly and detail drawings and data to demonstrate that all parts of the equipment will conform to the requirements and intent of the specifications. The drawings and data must include sectional views of bus installation, description of removable elements, equipment lists, and nameplate schedules.

SD-03 Product Data

Submit items below within 30 days after receipt of Notice to Proceed.

Descriptive Data; G, HDC Manufacturers data sheets including manufacturer types and catalog numbers for segregated phase bus Equipment; G, HDC

Test Data; G, HDC Certified copies of bus test data specified in paragraph 3.1.

Nameplates; G, HDC The Contractor will be permitted to supply and attach to the bus assembly a manufacturers nameplate or trademark. A drawing or illustration showing the proposed nameplate, its size and location, must be submitted.

SD-06 Test Reports

Factory Inspection and Tests; G, HDC

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Five certified copies of the reports of all tests, including complete test data.

Field Acceptance Tests; G, HDC Five (5) certified copies of the reports of all field acceptance tests, including complete test data.

Production Tests; G, HDC Five (5) certified copies of the reports of all production tests, including complete test data.

SD-07 Certificates

Factory Test Data; G, HDC Notification of factory test data must be 14 days prior to the proposed date of the tests so that arrangements can be made for the C.O. to be present at the tests.

SD-10 Operation and Maintenance Data

Operation and Maintenance Manuals; G, HDC Within 30 days prior to delivery of equipment, six (6)final copies of the previously approved manufacturer's standard Operation and Maintenance manuals must be provided to the Government on-site representative. .

a. Complete instructions covering the operation, adjustment and maintenance of the equipment. Catalog data or drawings must be provided showing all points where adjustments may be made.

b. Drawings which identify all spare parts by either part number or item and drawing number.

1.4 GENERAL REQUIREMENTS

1.4.1 General

The Contractor is required to accomplish all coordination between new bus manufacturer, new Current Limiting Reactor, new switchgear, and new Disconnect Switch manufacturer, in order to provide assurance to the Government that critical requirements are met. The Contractor is responsible for the coordination of connecting the new bus system to the new equipment provided by the various manufacturers and to the existing bus system.

1.4.2 Materials, Equipment and Installation

Provide new materials and equipment and any defective material or equipment damaged in the course of installation must be replaced or repaired. The installations must be in accordance with the National Electrical Code, NFPA 70 , and the National Electrical Safety Code, IEEE C2 , except where otherwise specifically shown or specified, in which case the drawings and specifications must govern. Omission of details on the drawings or in the specifications must not be construed as permitting deviations from Code requirements. Existing bus, disconnect switches and CLRs removed under this contract must remain the property of the Government, and be turned over to the Government.

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1.4.3 Standard Products

Material and equipment must be the standard products of manufacturers regularly engaged in the manufacture of these products and must essentially duplicate items that have been in satisfactory use for at least 5 years prior to proposal due date.

1.4.4 Corrosion Prevention

1.4.4.1 General

Protect all equipment to prevent deterioration from corrosion. The general requirements are specified below; however, other corrosion-resisting treatments that are the equivalent of those specified may be used. Materials used for corrosion prevention must be submitted for approval under SD-03 Product Data.

1.4.4.2 Fastenings and Fittings

Screws, bolts, nuts, pins, studs, springs, washers and other miscellaneous fastening and fittings must be of corrosion-resistant material or must be treated in an approved manner to render them resistant to corrosion. All fastenings which are to be exposed directly to the weather must be of corrosion-resisting material.

1.4.4.3 Corrosion-Resisting Materials

Corrosion-resisting steel, copper, brass, bronze, copper-nickel-copper alloys are acceptable corrosion-resisting materials.

1.4.4.4 Corrosion-Resisting Treatments

Treatments must be in accordance with ASTM A123/A123M or ASTM A153/A153M .

1.4.4.5 Finish

Final painting must be done in accordance with paragraph "PAINTING".

1.4.5 Storage and Handling

Materials and equipment must be suitably protected from dampness, dust and physical damage.

1.5 QUALIFICATIONS

Each manufacturer must have a minimum of five (5) years experience with the production of equipment of the same type and rating.

PART 2 PRODUCTS

2.1 GENERAL

Submit Descriptive Data and a List of Proposed Products for all equipment to be installed under this contract and provide a current Submittal Register when requested by the COR. All materials, components, and equipment must conform to the requirements of these specifications.

Materials, components, and equipment must be free from defects and imperfections, of recent manufacture, and must have mechanical and electrical properties suitable for the intended use. All materials, SECTION 26 25 00.00 26 Page 6 components, and equipment not manufactured by the Contractor must be products of other recognized reputable manufacturers meeting the requirements of this section paragraph QUALIFICATIONS. Insofar as practicable, devices and equipment used for the same or similar services must be of the same make and type, and must be interchangeable when of the same rating. Nameplates if added to the equipment, must be submitted as required in the Submittals paragraph above and in the paragraph titled Nameplates below.

2.2 BUS CONDUCTORS

The bus must be of copper and of shapes that match the existing bus materials and shapes, or as approved. Field verify existing materials and shapes in order to match the new equipment to the existing equipment. The electrical ratings of the new equipment must be 1000 amperes for the segregated phase bus connecting generator 2 bus to the new 15kV switchgear breaker 224 and 2500 amperes for the segregated phase bus connecting generator 1 and 3 bus to the 15kV switchgear breakers 124 and 324, respectively.

2.3 BUS SUPPORTS

Provide all hardware as necessary for supporting the bus structures furnished and for bolting the bus housings to the support structures.

Saddles must be insulated from the surface or support member to which they are attached. Furnish any necessary inserts and associated bolts for attaching bus supports to supports. Supporting structures must be finished to match the bus and all associated ferrous fasteners must have a rust-resistant finish. External supporting members which are not an integral part of the bus housing and all associated ferrous fasteners must be galvanized. The bus supports must be insulated from the concrete anchors/fasteners to prevent heating in the bus support structure due to circulating currents. The recommended method of anchoring, with size and quantity of bolts, must be shown on the Contractor's drawings. The bus support structure must comply with SECTION 13 48 00.00 26 SEISMIC

RESTRAINT FOR MECHANICAL AND ELECTRICAL EQUIPMENT.

2.4 BONDING

All bus housing sections and support structures must be connected to the existing powerhouse ground system. Bus housing sections must be bonded together or connected to a common ground bus to facilitate connection to the powerhouse ground system. The proposed method of grounding must be subject to the COR for approval. Multigrip clamp-type terminals must be provided for connecting to the existing powerhouse ground system. Contact surfaces at points of attachment of terminals must be silver-plated.

2.5 THREADED CONNECTIONS

All bolts, studs, machine screws, nuts, and tapped holes used must be in accordance with ASME B1.1 . Threads for sizes 1/4-inch to l-inch, inclusive, must be NC or UNC series. The sizes and threads of all conduit and fittings, tubing and fittings, and connecting equipment must be in accordance with ASME B1.20.1 . Manufacturers' standard threads and construction may be used on small items which, in the opinion of the C.O., are integrally replaceable, except threads for external connections to these items must meet the requirements outlined above.

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2.6 PAINT

Paint must be quick air-drying lacquer or synthetic enamel with semi-gloss finish, ANSI No. 61 Light Gray. Lead-based paints must not be used.

2.7 SEGREGATED PHASE BUS

2.7.1 Rating

The segregated bus must be copper, rated as per IEEE C37.23 and must have a 3-phase, 15 kV, 110 kV BIL rating, continuous current rating without injury to any part of the bus structure of 1000 ampere for generator 2 and 2500 amperes for generator 1 and 3 and without bus conductors exceeding a maximum temperature rise of 65C above a 40C ambient, short-time withstand current rating not less than 63,000 amperes, and momentary withstand current rating not less than 130,000 amperes, or as otherwise approved.

2.7.2 Insulation Boots

Molded neoprene insulation boots of equivalent mechanical and electrical strength as that enclosing the bus must be provided at bus joints.

2.7.3 Bus Insulation

Taped insulation must not be allowed. The use of polyvinylchloride materials for bus insulation is not acceptable for use in the powerhouse.

The three insulated conductors must be mounted on high strength, wet process porcelain insulators or with insulating supports and spacers inside a common sheet metal enclosure. Alternately, the phase conductors may be bare and each supported on high-strength wet process porcelain insulators.

2.7.4 Inspection Cover Plates

Readily removable cover plates of the same material as the metal enclosure must be provided for access to all bus conductors. All bus cover plates must be connected to the housing with machine screws, lockwashers, and captive nuts. The bus enclosure must be non-ventilated weatherproof/dustproof.

2.7.5 Transition Compartments

Transition compartments must be provided, if required, to connect the bus enclosure to the metal-clad switchgear assemblies. Internal busing of such compartments must have continuous current carrying capacities and momentary ratings not less than required for the adjacent bus structure.

Flexible connectors must be installed in the bus where expansion joints are required.

2.8 ACCESSORIES

The accessories to be furnished, which must be packed and marked ,must include:

1 (one) - Complete set of all special wrenches and tools required for the installation, maintenance, and repair of the segregated phase bus system.

1 (one) - Gallon of paint to match the finish of the bus equipment

SECTION 26 25 00.00 26 Page 8 housing and support structures (quart containers).

2.9 SPARE PARTS

All spare parts for the buses must be duplicates of the original parts furnished and interchangeable therewith and are as follows:

3 (three)- Insulating bus supports, of each type and size used.

3 (three) - Insulating covers for bolted bus splices.

12 (twelve) - Bolts with washers for bolted bus splices.

3 (three) - Porcelain insulators, of each type used.

1 (one) - Insulating gasket of each type used.

1 (one) - Dozen bolt insulation insert/washer sets of each type used.

1 (one) - Container of bolted joint grease if used, sufficient for two treatments of all equipment. ]

2.10 Shop Drawings

Submit the following shop drawings:

Outline drawings of all equipment to be furnished under this specification, together with weights, detail dimensions, and complete mounting details must be submitted. Drawings are for design details and for installation and must be furnished with any provisions for adjustments of connections to new or existing equipment. Provide complete shop drawings showing detailed design of all bus sections, connections, terminations, grounding, structural supports, hardware, and fittings. Provide details showing, the new bus connections, housing supports and anchoring.

Provide detail drawings of each size and type of joint.

PART 3 EXECUTION

3.1 GENERAL

3.1.1 General

a. The Contractor must field verify all dimensions and details of the existing bus associated with the electrical configuration shown to develop the bus design. Caution must be taken to prevent damage to the retained bus structures during the disconnection and removal or modifications of the existing bus structures as well as in the installation of the new bus structures. Newsegregated phase bus must be anchored to the powerhouse concrete foundation in accordance with

SECTION 13 48 00.00 26.

b. Outline Drawings, Assembly and detail drawings, Schematic Diagrams, and connection diagrams, Test Data, Field Acceptance Tests, Operation and Maintenance Manuals must be prepared and submitted as described in paragraph "SUBMITTALS".

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3.1.2 Segregated Phase Bus Installation and Field Tests

a. The segregated bus must be installed from the the existing generator bus to the new 15kV switchgear breakers in Cubicle Room, as shown on the drawings.

b. The installation must include making all bus conductor and housing connections and must also include attaching plates at bus passages through concrete openings and at bus terminations. Plates must be drilled to line up with matching enclosures or frames. The Contractor must be responsible for verifying that all bus fittings, connections, and hardware are of the correct material, ampacity, and shape for a correct installation.

c. The installation must also include high-potential tests on both the switchgear assembly and the segregated phase bus, with breaker isolated, consisting of 60 HZ, 27 kV AC potential applied for one minute between each phase and ground and between adjacent phases.

3.1.3 Design and Manufacturing Coordination

The Contractor must coordinate with the switchgear,] manufacturer, through the Government for the exchange of all the dimensions, necessary drawings, templates, gauges, and other information required to insure a complete and proper design and manufacture of all connecting or related parts. The Contractor must also field verify all dimensions and details of the existing bus associated with the system electrical reconfiguration shown to develop the bus design. Two (2) copies of all Shop Drawings and all correspondence records relating to drawings and specifications interchanged between manufacturers must be submitted.

3.2 PAINTING

3.2.1 New Equipment

New equipment interior and exterior steel surfaces of the equipment housing must be thoroughly cleaned and then receive a rust-inhibitive phosphatizing or equivalent treatment prior to painting in accordance with IEEE C37.20.2 . Exterior surfaces must be free from holes, seams, dents, weld marks, loose scale, or other imperfections. Interior surfaces must receive not less than one coat of corrosion-resisting paint in accordance with the manufacturer's standard practice. Exterior surfaces must be primed, filled where necessary, and given not less than two coats of paint.

3.2.2 Existing Equipment

Any paint damaged during modifications to existing equipment must be repaired by degreasing, sanding, feather-edging, priming, and finishing with an approved paint of matching color. Tiny nicks and other similar damage may, if approved, be repaired with matching finish color alone.

3.3 DISPOSAL OF REMOVED EQUIPMENT

All removed equipment not retained for Government reuse must become the property of the Contractor.

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3.4 FACTORY INSPECTION AND TESTS

3.4.1 General

Factory Test Data must be prepared and submitted as described in paragraph

"SUBMITTALS".

3.4.2 Metal-Enclosed Bus Design Tests

The metal-enclosed buses must be subjected to design tests in accordance with paragraph 6.2.1 of IEEE C37.23 and manufactures recommendations.

Representative sections of the buses must be design tested if the tests specified below have not been made previously. These tests will not be required if satisfactory tests have previously been made on metal enclosed buses of the same design, construction and rating as that specified, in which case the Contractor must furnish certified copies of these tests to prove adequacy of design. Tests must be in accordance with IEEE C37.23 as follows:

a. Impulse Withstand Dielectric Test (full-wave), paragraph 6.2.1.2.

b. Rated Continuous Current Test, paragraph 6.2.2.

c. Short-Circuit Withstand Current Test, paragraph 6.2.3.

3.4.3 Factory Inspection and TestsSegregated

Phase Bus

All tests required herein must be witnessed by the C.O., unless waived in writing, and no equipment must be shipped until it has been released for shipment by the Government. The Government must be notified a minimum of 15 days in advance of the date of the tests, so that arrangements can be made for the C.O. to be present at and witness the tests. The cost of performing all tests must be borne by the Contractor and must be included in the price bid. The Contractor must furnish five certified copies of the reports of all design and factory tests for approval. All test reports must be signed by the manufacturer, and the reports of all tests made to be furnished under the contract must be signed by the C.O.. The factory test equipment and the test methods used must conform to the applied requirement of ANSI, IEEE Standards and NEMA Publications and must be subject to approval. ]

3.5 INSTALLATION PLAN AND SCHEDULE

Not later than 60 calendar days prior start of work six (6) copies of a detailed removal and installation plan to include a Construction Progress Schedule. The plan must include the installation of the bus and 15kV equipment at each location as shown on the contract drawings. The Contractor must provide a Removal and Installation Plan and schedule or Work Plan, which gives a procedure indicating the schedule for replacement of each piece of equipment. The schedule must indicate the expected length of each outage. The plan must indicate how one bus and/or bus duct is to be isolated from the other bus and/or bus duct when existing equipment is being removed and new equipment installed. If an existing pad is to be removed, include in the schedule when this work is to be performed. The Contractor will not be permitted to begin work at the project site until the installation plans have been "Approved" or "Approved Except as Noted."

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3.6 QUALIFICATIONS OF FIELD ENGINEERING SERVICE PERSONNEL

The Contractor must provide qualified field engineering service personnel who are fluent in the English language to supervise, test, and install the new equipment specified in this section and related equipment of the same manufacturer during installation. The personnel must have a minimum of two (2) years experience in the installation and testing of new equipment made by the manufacturer used. The Field Engineering Service Supervisor must certify that the equipment has been installed in accordance with the manufacturers recommendations and all warranties are in effect. The field engineering service personnel must be present during both the Contractor's commissioning of equipment and for the Government's commissioning of the system, per Section 26 08 01.00 26, SYSTEMS TESTING AND COMMISSIONING.

The Contractor must provide the Contracting Officer with a current resume for all field engineering service personnel.

3.7 COMMISSIONING

The Contractor must be responsible for performing all equipment commissioning required by the equipment manufacturers and as noted in Section 26 08 01.00 26, SYSTEMS TESTING AND COMMISSIONING.

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