33 75 10.00 26 Am-0001.pdf

Switchyard Disconnect Switch Replacement Oahe Dam OAA2

SECTION TABLE OF CONTENTS

DIVISION 33 - UTILITIES

SECTION 33 75 10.00 26

HIGH VOLTAGE GROUP-OPERATED DISCONNECT SWITCHES AND GROUNDING SWITCHES

PART 1 GENERAL

1.1 GENERAL INFORMATION

1.2 REFERENCES

1.3 SUBMITTALS

1.4 ENVIRONMENTAL DESIGN CRITERIA

1.5 MANUFACTURER'S QUALIFICATIONS

1.6 GENERAL REQUIREMENTS

1.6.1 Bill of Materials

1.6.2 Manufacturer's Nameplate

1.6.3 Contractor's Drawings

PART 2 PRODUCTS

2.1 OUTDOOR DISCONNECT AND GROUNDING SWITCH

2.1.1 General Switch Requirements

2.1.2 Support Structure

2.1.3 Structural Design Criteria

2.1.4 Construction

2.1.5 Hardware

2.1.6 Galvanizing

2.1.7 Ratings for 115kV Disconnect Switches

2.1.8 Ratings for 230kV Disconnect Switches

2.1.9 Bases

2.1.10 Blades

2.1.11 Contacts

2.1.12 Hinge Connections

2.1.13 Terminals

2.1.14 Switch Bearings

2.1.15 Switch Insulators

2.1.16 Arcing Horns

2.1.17 Grounding Switch

2.2 OPERATING MECHANISMS

2.2.1 Construction

2.2.2 Bonding Jumper

2.2.3 Operator Bearings

2.2.4 Shafts and Linkages

2.2.5 Drive Train

2.2.6 Manual Operating Mechanisms

2.2.7 Motor Operated Mechanisms

2.2.7.1 Motor

2.2.7.2 Motor Operator Control

2.2.7.3 Motor Limit Switches

2.2.7.4 Motor Operator Housing

2.2.7.5 Motor Operator Isolation

2.2.7.6 Terminal Blocks

2.2.7.7 Wiring

2.2.8 Grounding Switch Operator

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2.3 AUXILIARY SWITCHES

2.4 MECHANICAL INTERLOCK

2.5 SWITCH TOOLS AND ACCESSORIES

2.6 SPARE PARTS

PART 3 EXECUTION

3.1 GENERAL

3.2 SWITCH INTERLOCKING SEQUENCE

3.3 FACTORY TESTS

3.3.1 Routine Test

3.3.2 Group-Operated Disconnect and Grounding Switch Type Tests

3.3.3 Group-Operated Disconnect and Grounding Switch Factory Tests

3.3.4 Motor Operating Mechanisms

3.3.5 Insulator Tests

3.3.5.1 Design

3.3.5.2 Production

3.4 FIELD ACCEPTANCE TESTING

3.4.1 Visual and Mechanical Inspection

3.4.2 Electrical Tests

3.5 OPERATION AND MAINTENANCE (O&M) DATA

3.6 CONTRACTOR-FURNISHED TRAINING OF GOVERNMENT PERSONNEL

3.7 SERVICES OF THE SWITCH MANUFACTURER'S ERECTING ENGINEER

-- End of Section Table of Contents --

SECTION 33 75 10.00 26 Page 2

SECTION 33 75 10.00 26

HIGH VOLTAGE GROUP-OPERATED DISCONNECT SWITCHES AND GROUNDING SWITCHES

PART 1 GENERAL

1.1 GENERAL INFORMATION

This specification covers the new group-operated disconnect switches and grounding switches that will replace the existing 115kV and 230kV switches at Oahe Dam. The switches shall be provided complete with operating mechanisms and accessories as indicated herein.

1.2 REFERENCES

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

AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)

ASCE 7-10 (2010; Errata 2011; Supp 1 2013) Minimum Design Loads for Buildings and Other Structures

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI C29.1 (2018) Test Methods for Electrical Power Insulators

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

ANSI C37.32 (2002) High-Voltage Switches, Bus Supports, and Accessories - Schedules of Preferred Ratings, Construction Guidelines, and Specifications

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

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

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

ASTM INTERNATIONAL (ASTM)

ASTM A36/A36M (2019) Standard Specification for Carbon Structural Steel

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

ASTM A153/A153M (2016) Standard Specification for Zinc

SECTION 33 75 10.00 26 Page 3

Coating (Hot-Dip) on Iron and Steel Hardware

ASTM B98/B98M (2013) Standard Specification for Copper-Silicon Alloy Rod, Bar, and Shapes

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 693 (2018) Recommended Practice for Seismic Design of Substations

IEEE C2 (2017) National Electrical Safety Code

IEEE C37.30.1 (2011) Standard Requirements for AC High-Voltage Air Switches Rated Above 1000 V

IEEE C37.30.2 (2015) Guide for Wind - Loading Evaluation of High - Voltage (>1000 V) Air - Break Switches

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA ICS 1 (2000; R 2015) Industrial Control and Systems - General Requirements

NEMA ICS 2 (2000; R 2005) Industrial Control and Systems Controllers: Contactors and Overload Relays Rated 600 Volts

NEMA MG 1 (2016; SUPP 2016) Motors and Generators

INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA)

NETA ATS (2013) Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2017) National Electrical Code

UNDERWRITERS LABORATORIES (UL)

UL 44 (2014; Reprint Feb 2015) Thermoset-Insulated Wires and Cables

UL 1063 (2017) Machine-Tool Wires and Cables

UL 1581 (2017) Reference Standard for Electrical Wires, Cables, and Flexible Cords

1.3 SUBMITTALS

Government approval is required for all 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. Submit the following in accordance with SECTION 01 33 00 SUBMITTAL PROCEDURES:

SECTION 33 75 10.00 26 Page 4

SD-02 Shop Drawings

Submit within 30 calendar days of Notice to Proceed.

Bill of Materials

Outline Drawings; G HDC

Mounting Details; G HDC

Schematic Diagrams; G HDC

Wiring Diagrams; G HDC

For the approved versions of the above drawings, also submit copies of the MicroStation or AutoCAD files used to generate the drawings.

Manufacturer's Nameplate

SD-03 Product Data

Submit within 30 calendar days of Notice to Proceed.

Disconnect Switch; G HDC

Grounding Switch; G HDC

Manual Switch Operators; G HDC

Motorized Switch Operators; G HDC

Switch Insulators; G HDC

Ground Switch Interlocking; G HDC

Mechanical Interlock; G, HDC

SD-05 Design Data

Submit within 90 calendar days of Notice to Proceed.

Structural Design Criteria and Seismic Calculations; G, HDC

SD-06 Test Reports

Submit within 10 calendar days of completion of test.

Factory Tests; G, HDC

Insulator Tests; G, HDC

Type Tests

*Am-1 SD-07 Certificates

Erecting Engineer's Qualifications; G, HDC **Am-1

SECTION 33 75 10.00 26 Page 5

SD-10 Operation and Maintenance Data

Submit in accordance with Section 01 78 23: OPERATION AND MAINTENANCE DATA.

Operation and Maintenance Manuals; G HDC

Submit 90 days prior to training.

Contractor-Furnished Training of Government Personnel; G, HDC

1.4 ENVIRONMENTAL DESIGN CRITERIA

The switches will be located outdoors in unconfined air in a hydroelectric substation, at an altitude below 3,300 feet, within ambient temperature extremes of -40 degrees C to +50 degrees C, and ice conditions.

1.5 MANUFACTURER'S QUALIFICATIONS

The disconnect switch manufacturer must have a minimum two (2) years experience with the production of equipment of the same type and rating.

1.6 GENERAL REQUIREMENTS

1.6.1 Bill of Materials

Submit a comprehensive bill of materials (schedule of equipment) for each shop drawing set submitted. The schedule must be part of the drawing set, having a title block, border, and sheet number compatible with the drawing set. The schedule must provide a cross reference between manufacturer data and shop drawings, regardless of whether the product data is submitted at the same time as the shop drawing set, and must include the total quantity, manufacturer, part number, and location of each item of equipment supplied. For complete assemblies, provide the serial numbers of each assembly, and a sub-schedule of replaceable components within the assembly.

1.6.2 Manufacturer's Nameplate

Provide at the base of each pole of the switch, and the enclosure of each electric operator, the manufacturer's nameplate showing information in accordance with IEEE C37.30.1 .

1.6.3 Contractor's Drawings

Submit the following drawings in accordance with the descriptions in paragraph: SUBMITTALS:

a. Mounting details and dimensions.

i. Location and dimensional data of switch terminals.

ii. Dimensional data pertaining to the arc of travel of disconnect and grounding switch blades.

iii. Plan and elevation for travel of energized parts during operation showing clearances for existing walls and steel structures.

SECTION 33 75 10.00 26 Page 6

iv. Open-gap (metal-to-metal) distance.

v. Net weight of each complete single pole assembly, including insulators and surge resistors.

vi. Mounting details for limit switches, auxiliary switches, and auxiliary contacts, and provisions for adjustment.

vii. Net weight of the operators.

b. Outline drawings of the switch arrangement for each pole showing installation dimensions, including the operating mechanism.

c. Detailed wiring diagrams showing both the internal and external connections, auxiliary switches, and interlocks.

d. Schematic diagrams for the motor-operator control scheme and auxiliaries, and key interlocking.

PART 2 PRODUCTS

2.1 OUTDOOR DISCONNECT AND GROUNDING SWITCH

2.1.1 General Switch Requirements

Provide three-pole, single-throw, outdoor group-operated non-load break disconnect switches and grounding switches. Provide the disconnect switch, grounding switch, motorized switch operators, and manual switch operators complete with linkages, terminal connectors, hardware, accessories, and necessary mounting devices. The disconnect switches are to be vertical break type, with simultaneous operation of all three poles. The operating linkage and switch frame must be suitable for mounting on the indicated structures. Where mounted to existing structures, the mounting must account for any adaptation necessary to mount the switches to the structures with the coordination and approval of the switch manufacturer.

The motion of the switch blades must be accomplished through the rotation about its axis of one insulator stack per pole in each switch.

2.1.2 Support Structure

Provide mounting plates and/or adapter plates furnished by the switch manufacturer necessary to mount the switches on the structures. Where additions or modifications to existing switch structures are necessary to accommodate the approved switches, design and fabricate such modifications with the participation of the switch manufacturer and a registered Professional Engineer, and include that with the submittal for Structural Design Criteria and Seismic Calculations described in paragraph:

Structural Design Criteria. Provide all bolts, studs, machine screws, nuts, and tapped holes meeting the requirements of ASME B1.1 . Threads for sizes 1/4-inch to 1-inch, inclusive, must be NC or UNC series. The sizes and threads of all pipe fittings must be in accordance with ASME B1.20.1 .

Manufacturers' standard threads and construction may be used on small items which are integrally replaceable, except that threads for external connection to these items must meet the above requirements.

2.1.3 Structural Design Criteria

Submit structural design criteria and seismic calculations for the switch

SECTION 33 75 10.00 26 Page 7 design and switch mounting. The seismic engineering requirements cover the equipment, and anchorage requirements to the supporting structures.

The equipment provided must be shown to comply with the specified seismic parameters when installed. This is to be stamped by a registered professional engineer to certify proof of compliance. The seismic testing requirements may be satisfied by including in the submittal verification that design prototypes for the breakers and switches to be provided have complied with the qualifying requirements of IEEE 693 Annex E for disconnects, either by test or by analysis. If no previous seismic qualification for the equipment to be provided has been performed, then the manufacturer must perform these tests and/or analyses for the equipment to be provided.

Structural design criteria includes the following:

a. Indicate the industry design standards and allowable stresses or capacities to which steel plate, structural steel shapes, welds, bolts and studs conform.

b. Indicate the industry standards used in developing the seismic forces and analysis techniques used in design of the switch and switch components.

c. Meet or exceed the effect of seismic design forces obtained from the requirements and methods referenced in IEEE 693 .

d. Account for the effect of wind load forces based upon Section

26.5.1 "Basic Wind Speed" of ASCE 7-10 , or 40 psf, whichever is greater. The switch must be designed for wind loading in accordance with IEEE C37.30.2 .

2.1.4 Construction

The tie between the hinge and jaw insulator stacks of the switches formed by the switch blade in the closed position must be designed to balance all stresses. Provide a positive tie in the form of a bridge between the rotating and stationary insulator stacks at the hinge end. The switches must open and close smoothly without appreciable jar or vibration, and the poles must allow the blades to be toggled into both the open and closed positions. All current-carrying parts of the switches must use non-ferrous materials of high conductivity and contain not more than ten-percent zinc. Hinge pins must be made of high-grade corrosion-resistant materials. Silver plate all bolted contact surfaces.

Brazing will not be permitted except as necessary for coating the contact surfaces. Avoid points and sharp angles on blades, clips, and terminals that would create corona, or provide adequate shielding against corona discharge.

2.1.5 Hardware

Use silicon bronze bolts, nuts washers and pins conforming to ASTM B98/B98M, Alloy B, silicon bronze, or non-magnetic stainless steel in the assembly of non-ferrous parts. Other corrosion-resistant metals may be used, if approved by the Government. Bolts and pins must have a minimum tensile strength of 75,000 pounds per square inch.

2.1.6 Galvanizing

Perform all galvanizing in accordance with ASTM A123/A123M or

SECTION 33 75 10.00 26 Page 8

ASTM A153/A153M as applicable. The zinc-iron alloy formed at the surface of the bare steel should not exceed approximately 70 percent of the total zinc layer deposited.

2.1.7 Ratings for 115kV Disconnect Switches

Switch ratings must conform to the requirements of ANSI C29.9 and IEEE C37.30.1 . The required ratings of the switches are indicated below.

a. Rated Maximum Voltage, kV rms 123

b. Basic Impulse Insulation Level, kV Crest 550

c. Continuous Current Rating, Amperes, rms 2000

d. Short-Time Current Rating, kA, rms 44

e. Ice-Breaking Ability, inches 0.75

f. Insulator Stacks, Technical Ref. No. TR 287

2.1.8 Ratings for 230kV Disconnect Switches

Switch ratings must conform to the requirements of ANSI C29.9 and IEEE C37.30.1 . The required ratings of the switches are indicated below.

a. Rated Maximum Voltage, kV rms 245

b. Basic Impulse Insulation Level, kV Crest 900

c. Continuous Current Rating, Amperes, rms 2000

d. Short-Time Current Rating, kA, rms 44

e. Ice-Breaking Ability, inches 0.75

f. Insulator Stacks, Technical Ref. No. TR 308

2.1.9 Bases

Fabricate the switch bases and frames from structural steel conforming to the requirements of ASTM A36/A36M. Each single-pole switch element must be assembled on an individual base, preferably to a common frame. The bases must be rigid and self supporting, without cross bracing between phases other than the steel supporting structure. Construct the bases such that the deflection under maximum operating force will not interfere with the successful operation of the switch when the bases are mounted rigidly at the points of support. Provide galvanized mounting bolts and beveled washers for mounting the switches on the steel structure.

2.1.10 Blades

Blades must be of tubular construction able to withstand operation under the weather and ice conditions specified in paragraph: ENVIRONMENTAL DESIGN CRITERIAand to provide maximum strength with minimum weight. They must also be sufficiently rigid to prevent whip or vibration, and of a configuration that will minimize an accumulation of ice, sleet or other foreign matter. All blades on disconnects must be counter-balanced to insure optimum ease of operation and smooth control.

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2.1.11 Contacts

All main switch contacts must be high-pressure type, with self-cleaning contacts such that the wiping action will not cause scarring or abrasion of the contact surfaces. If contact surfaces are of silver, the silver must be at least 10 mils thick. Provide fixed guides so that proper seating of contacts will be obtained when a blade is out of line by one inch or less in any direction.

2.1.12 Hinge Connections

The current-carrying path through the hinge mechanism of the switches must utilize movable pressure type contacts of proven configuration. The entire hinge mechanism of the switch must be configured and constructed such that nesting of birds and insects is prevented or does not interfere with proper operation of the switch.

2.1.13 Terminals

Switch terminal pads must be of high-strength aluminum alloy or high-copper alloy with silver-plated contact surfaces suitable for connection of copper or aluminum conductors, NEMA six hole type per ANSI C37.32 Figure 1(c), able to accommodate NEMA two or four hole connections. Terminal loading must meet the requirements of IEEE C37.30.1 Table 4 for the switch type and rating.

2.1.14 Switch Bearings

All bearings must be ample in size to sustain the imposed loads, and must ensure continued ease of operation and long life. Bearings provided at the base of the rotating insulator column for each switch pole may be of the ball or roller type, and be adequately protected from the weather to prevent the entrance of dirt or moisture and resulting corrosion. All other bearings must maintain proper alignment, ensure ease of operations, and ensure against corrosion and seizing under the operating conditions specified in paragraph: ENVIRONMENTAL DESIGN CRITERIA. Enclose all gears in weatherproof cases to retain the necessary lubrication to cover the gears. All main switches must have bearings at the base of each rotating insulator stack and, if necessary, additional bearings at the top of the stack.

2.1.15 Switch Insulators

Provide each pole of each switch with insulator units as described in paragraph: General Switch Requirements complete with hardware, with technical reference number as specified in paragraph: Ratings. Each insulator unit must be porcelain or composite material of a type and style being currently produced by the switch manufacturer, conforming to the applicable requirements of ANSI C29.9 . Provide suitable means to adjust the vertical axis on all insulator stacks when assembled.

2.1.16 Arcing Horns

Provide arcing horns on the switch jaw and the blade end. The arcing horns must be the manufacturer's standard for switches of the ratings provided. Include arc horn details and the associated equipment spacings on the manufacturer's submitted drawings.

SECTION 33 75 10.00 26 Page 10

2.1.17 Grounding Switch

Provide a 3-pole grounding switch with a manual operating mechanism for the grounding blades, installed on the jaw end of the disconnect switch.

The ground switch must lay parallel to the disconnect switch while open.

The grounding switch stationary contacts must have a short-time current rating of 44k amperes. The contact surfaces must have sufficient wiping action to be self-cleaning. Grounding blades must be of the same quality of material and workmanship as the main switch blades. Provide ground switch interlocking to prevent the closing of the main disconnect switch when the grounding switch is in the closed position, as well as to prevent the closing of the grounding switch when the main disconnect switch is in the closed position.

2.2 OPERATING MECHANISMS

2.2.1 Construction

Provide a manual hand-crank and/oran electrically operated operating mechanism for group operation of the three blades as shown on the contract drawings. Manual lever-type mechanisms and Hydraulic or pneumatic mechanisms will not be allowed. All operating mechanisms must be suitable for operating the switches without the use of special tools and be complete with linkages, cranks, gears, bearings, interlocks, and levers.

Provide galvanized or corrosion-resistant brackets, plates, channels, angles, bolts, nuts, and washers, bearings, housings, and auxiliary switches for mounting the mechanisms on the steel structures. The operating mechanism must provide smooth simultaneous movement of the switch blades throughout the entire cycle of operation. The entire configuration must be such that cantilever or torsional stresses imposed upon any insulator column by the operation of the switch will not exceed the safe limits of the column. Provide a means of individual adjustment at each pole to compensate for misalignments of the switch bases and operating shafts. After final adjustments, it must be mechanically impossible for any blade to remain in the open or closed position when the mechanism has been operated at any speed. All hinge pins, cotter pins, piercing set screws, and lock washers must be of corrosion-resistant metal. All holes in cranks and linkages having moving pins must be drilled (not punched) to accurate fit. Attach all fittings to connecting rods or pipes with through-bolts or self-tapping set screws in addition to other means of attachment to insure that there will be no slipping of connections. Gears and bearings made of corrosion-resistant metal must be covered with a waterproof silicone-type grease at the time of factory assembly, or be completely immersed in a suitable lubricant. Gears and bearings of non-corrosion resistant metal must be completely immersed in a suitable lubricant, or may be covered with a silicon-type grease, subject to approval of the Government. The gears, bearings and lubricant must be sealed in the case to produce a mechanism which does not require maintenance.

2.2.2 Bonding Jumper

For each operating mechanism, include a 24-inch flexible copper braid conductor, equal in current-carrying capacity to No. 4/0 AWG copper cable, for grounding the lower end of the operating shaft or operating lever.

2.2.3 Operator Bearings

The weight of the shaft must be supported by a roller or ball bearing at

SECTION 33 75 10.00 26 Page 11 the bottom and/or at the top of the shaft. Provide the shaft with a guide or steady bearing so constructed that accumulations of foreign materials will not interfere with the operation, and repeated operations will not affect the corrosion-resisting coating on the shaft and the stationary part of the bearing.

2.2.4 Shafts and Linkages

All pole-to-pole and controller-to-pole connecting operating shafts and linkages must be continuous, with only the necessary fittings located at their extremities. The vertical operating shafts must be of the torsional type with suitable pipe guides or bearings at intervals of not more than ten (10) feet. Provide a mechanical device indicating the "OPEN" and "CLOSED" positions of the blades of the switch at the lower end of the vertical operating shaft for the blades. The indicator must be of corrosion-resistant metal and located where it will be readily visible from the ground. All vertical and horizontal operating shafts, and connecting pipe or shafting between phases must be constructed of corrosion-resistant material. Provide provision for padlocking each mechanism in both the open and closed positions.

2.2.5 Drive Train

All operating mechanisms must be enclosed in a weatherproof case made of corrosion-resistant metal, or metal hot-dip galvanized in accordance with ASTM A153/A153M . All gears and worms must be lubricated and completely enclosed in gear cases. A rain-tight shield must be provided where the vertical shaft extends through the gear case. All cases must retain the necessary lubrication to cover the gears, must be fitted with a drain hole and captive plug in the bottom, and be provided with pressure fittings if parts require periodic grease lubrication.

2.2.6 Manual Operating Mechanisms

Geared type manual operators for disconnect switches must be operated by a non-detachable crank. Lever-type mechanisms will not be accepted. The motion of the handle must be clockwise to close and counterclockwise to open the switch. The crank must be not more than 15 inches nor less than 12 inches in length. Grounding switch operators may be lever type if that is the manufacturer's standard for the grounding switch operators.

2.2.7 Motor Operated Mechanisms

The motor operated mechanism must be a reversing type with provision for manual operation in an emergency by means of a hand crank. Provide a means to automatically disconnect the electrical control circuit when the crank is inserted for manual operation, with a suitable hanger with fastening devices to hold the crank when not in use. The motor and controls must conform to applicable portions of NEMA MG 1 and NEMA ICS 2 .

Reversing contactors must be mechanically interlocked so that the opening and closing contactors cannot be closed at the same time. Provide NEMA Size 1 or larger contactors with operating coils suitable for continuous operation at rated voltage. A mechanical or other positive means to stop the operation of the disconnect and to hold it in the open or closed position must also be included. The motor control for a motor operated mechanism must be continuously loaded throughout the entire operating cycle to prevent the switch from alternately leading or lagging the control. An operation counter is also required.

SECTION 33 75 10.00 26 Page 12

2.2.7.1 Motor

Motors must be of the ball bearing type suitable for operation on 125 volt DC and must operate the switch satisfactorily at 5 percent overvoltage and 25 percent undervoltage for closing and opening. Protect the motor with overloads, sized as required, and have a molded case circuit breaker with magnetic trip unit for use as a disconnect means within the enclosure.

2.2.7.2 Motor Operator Control

Provide local motor operator control with a two-button, momentary contact, "OPEN-CLOSE" push-button station or a switchboard type control switch, accessible only when the housing door is open. Include an emergency stop button. The controls must be a heavy-duty type rated 600 volts AC, 250 volts DC, 20 amperes continuous, with single-break inductive load interrupting rating of not less than 1.5 amperes for 125 volts DC.

Controls must include a knife switch for visibly disconnecting the control voltage power supply. Include provisions for remote operation from the control room with "OPEN-CLOSE" handle and remote indicating lights, and a "LOCAL-REMOTE" switch transferring control to the remote operating station in the control room. Provide eight normally open and eight normally closed auxiliary contacts with each operator.

2.2.7.3 Motor Limit Switches

Motor limit switches must be heavy-duty snap-action type with sufficient contacts to provide the specified control functions. "OPEN" and "CLOSED" must accurately indicate the point during the main switch operating cycle when each blade reaches the end of its stroke and has successfully attained its fully open or fully closed limit position. The limit switches must positively hold their adjustment setting under all ambient operating conditions, in severe dust locations, and over indefinite periods of time to assure maximum integrity of position indication. Each limit switch must also be easily adjustable and easily accessible, and be electrically independent.

2.2.7.4 Motor Operator Housing

The motor operator housing must be deadfront with means for locking with a padlock when closed. The housing must be drilled for the entrance of conduits and include a208 volt, single-phase, AC heating unit of approximately 100 watts capacity, with an automatic thermostat control and a molded case circuit breaker or switch to disconnect the heating unit from the source of power. Doors must provide easy access to all parts.

Provide screened louvers with dust filters for ventilation, and a drain to prevent accumulation of moisture at the bottom of the housing.

2.2.7.5 Motor Operator Isolation

Provide a means to maintain an air gap between each motor operator and the vertical operating shaft while the switch is in its open or closed positions. The air gap system must be configured so that it can be padlocked in both the engaged and disengaged positions and be easily operated and locked from the ground by one person using no tools or accessories. When this mechanism is in its disengaged position, the switch blades must be capable of being padlocked in the open and closed positions. Although a disengagement featuring a visible air gap is preferred, other methods are acceptable, provided a position indicator is included. A combination padlocking arrangement meeting all the above

SECTION 33 75 10.00 26 Page 13 requirements is acceptable. The means of detaching the motor-operating mechanisms from the vertical operating shaft must be configured such that the switch must be in the same relative position to the motor-operating mechanism when the motor-operating mechanism is reconnected to the vertical operating shaft. Chance for error in reconnecting must be positively prevented.

2.2.7.6 Terminal Blocks

Provide sufficient terminal blocks in the motor operator for connection of the external wiring, including a minimum of ten percent spare terminals, but in no case less than four spare terminals may remain after completed installation. Terminal blocks must be of molded or fabricated type with barriers, rated not less than 600 volts, 30 amp. The terminals must be removable, binding, fillister, or washer head screw type terminals, or stud type with contact and locking nuts. Terminals must be suitable for connecting at least two No. 10 AWG conductors, with indented terminal connectors, to one terminal. Wiring must be complete between all equipment within the housing and the terminal blocks. Provide terminal block marking strips.

2.2.7.7 Wiring

Insulated wire for internal wiring of the operating mechanism controls and ancillary systems and devices must meet UL 1581 VW-1 flame test requirements and be Underwriters Laboratories listed, either type SIS, in accordance with UL 44 , or type MTW with heavy insulation thickness (Column A), in accordance with UL 1063 , except where heater circuit wire may require greater thermal withstand capacity. In such exceptions, the insulation must be non-asbestos, flame retardant, moisture and heat resistant and suitable for the maximum expected conductor temperatures.

All wires must be single-conductor, of stranded coated annealed copper, insulated for not less than 600 volt service. Standing must be Class B or Class C, except hinge wire stranding must be Class K. Conductor size may be not less than No. 14 AWG, except for current transformer secondary leads, which must be not less than No. 10 AWG. Make all connections to device terminal studs or blocks with pressure-indented terminals. Short, well-protected and well-supported runs of smaller wire sizes may be used only if specifically approved for each application, and only for internal functions which retain at least a 30% safety factor in wire ampacity.

2.2.8 Grounding Switch Operator

Provide a manual operated grounding switch operator, meeting the requirements of paragraph: Manual Operating Mechanisms.

2.3 AUXILIARY SWITCHES

Provide auxiliary switches on motor-operated disconnect switches as required for interlocking functions as described in this specification.

If multiple operating mechanisms and/or shafts are used on a single switch, then each operator mechanism and/or shaft must have the same auxiliary switches. Contacts must be rated 125 volts DC, and not less than 15 amperes continuous. All auxiliary switches must be adjustable for timing with the switch blades and be complete with all connecting links and fittings. False indication through the auxiliary switch must not be given if the switch blades fail to make a complete stroke. Provide terminal blocks in the auxiliary switches for external wire connections.

Auxiliary switches must be directly connected to linkage and keyed to

SECTION 33 75 10.00 26 Page 14 prevent slippage.

2.4 MECHANICAL INTERLOCK

Line and/or bus sectionalizing disconnect switches must have their operating mechanisms and enclosures fitted with keyed mechanical interlocks featuring auxiliary contacts rated 125VDC and 2.5 amperes continuous, installed to provide the interlocking described in paragraph, SWITCH INTERLOCKING SEQUENCE. Keys at the bus sectionalizing switches must be capable of accepting one of two keys as required for the scheme shown on the contract drawings.

2.5 SWITCH TOOLS AND ACCESSORIES

Furnish one complete set of all special tools, wrenches, and other appurtenant equipment that may be necessary or convenient for assembling, aligning or disassembling the switches.

2.6 SPARE PARTS

All spare parts must be of the same material and manufacture as the original parts, and be interchangeable therewith. Furnish the following spare parts:

a. Three (3) complete assemblies of stationary and moving shoes, or tip assemblies, for main contacts of one pole of each voltage class of disconnect switch and also for the grounding switch.

b. One (1) complete set of auxiliary contacts and springs for the disconnect switch and also for the grounding switch.

c. Six (6) complete switch insulator stacks of each size and rating.

d. One (1) set of limit switches and auxiliary switches of each rating.

e. One (1) motor for each switch rating for the motor operating mechanisms.

f. One (1) motor contactor of each rating.

g. One (1) coil for electrical brake release.

h. Three (3) solenoid coil for solenoid release unit.

i. One (1) complete set of auxiliary contacts and contact springs for the solenoid release unit.

j. One (1) breaker for each type and rating.

PART 3 EXECUTION

3.1 GENERAL

The finished installation must comply with the applicable requirements of NFPA 70 , and the IEEE C2 . All existing ground connections from the grounding grid and from the switch operator's platform shall be recommected to the new switch ground leads.

SECTION 33 75 10.00 26 Page 15

3.2 SWITCH INTERLOCKING SEQUENCE

Each grounding switch operating mechanism shall be interlocked with the two paired disconnect switch mechanisms as shown on the contract drawings to prevent the closing of either disconnect switch when the grounding switch is in the closed position, as well as to prevent the closing of the grounding switch when either of the disconnect switches is in the closed position. The interlocking system shall match the existing interlock system in use at Oahe.

3.3 FACTORY TESTS

3.3.1 Routine Test

Each item of equipment must receive the manufacturer's routine factory testsand other tests specified below. The factory test equipment and the test methods used must conform to the applicable requirements of ANSI Standards, IEEE Standards, and NEMA Publications and are subject to the approval of the Government. All tests required will be witnessed by the Government unless waived in writing. No equipment may be shipped until it has been approved for shipment by the Government. Notify the Government a minimum of 30 days in advance of the date of the tests so that arrangements can be made for the Government representative to be present at the tests. The cost of performing all tests must be borne by the Contractor.

3.3.2 Group-Operated Disconnect and Grounding Switch Type Tests

The switch manufacturer must have performed the specified design tests or type tests on switches of identical construction and of the same voltage, continuous current and momentary current ratings as those specified. The following tests must have been performed in accordance with the applicable provisions of IEEE C37.30.1 :

a. Dielectric tests including low-frequency, dry-withstand, and impulse-withstand, temperature rise tests, and short time current tests.

b. Switching impulse test.

c. Ice test.

d. Radio influence test.

e. Corona test.

f. Hinge mechanism tests demonstrating momentary and continuous current capacity as specified.

3.3.3 Group-Operated Disconnect and Grounding Switch Factory Tests

All tests will be witnessed by the Government, unless waived in writing.

No equipment may be shipped until it has been released for shipment by the Government. Perform the following tests in accordance with the applicable provisions of IEEE C37.30.1 :

a. Each single-pole of the disconnect switch must be assembled without insulators, inspected and given the manufacturer's routine

SECTION 33 75 10.00 26 Page 16 production and operating tests. Perform the tests with switch mounted in a position as shown on the contract drawings. Make factory adjustments so made that field changes will not be required on the switch beyond the point where interphase connections are attached to the rotating insulators.

b. All parts must be properly marked and identified for ease of field assembly.

c. Verify all dimensions in accordance with the applicable contract and manufacturer's drawings.

3.3.4 Motor Operating Mechanisms

Perform the following tests on the motor operators to be furnished:

a. Inspection and operation tests on each electrical operating mechanism. The completely assembled motor-operator must be given electrical operational tests to verify electrical connections, operation free of misalignment or binding, and satisfactory overall assembly and performance.

b. Dielectric test on each motor in accordance with NEMA MG 1.

c. Dielectric test on the control equipment for each motor in accordance with NEMA ICS 1 .

3.3.5 Insulator Tests

Perform the following tests on the specified insulators in accordance with ANSI C29.1 and as specified below.

3.3.5.1 Design

The original design tests of insulators of identical construction and ratings as those specified must have been made in accordance with the requirements of ANSI C29.9 .

3.3.5.2 Production

Insulators must be given routine tests as specified in ANSI C29.9 .

Quality Conformance Tests described in ANSI C29.9 will be required for insulators furnished under the contract, unless waived in writing.

3.4 FIELD ACCEPTANCE TESTING

3.4.1 Visual and Mechanical Inspection

a. Perform mechanical operator tests in accordance with manufacturer's published data.

b. Verify correct operation and adjustment of motor operator limit switches and mechanical interlocks.

c. Verify correct blade alignment, blade penetration, travel stops, arc interrupter operation, and mechanical operation.

d. Verify correct operation of all indicating and control devices.

SECTION 33 75 10.00 26 Page 17

e. Verify appropriate lubrication on moving current-carrying parts and on moving and sliding surfaces.

f. Verify operation and sequencing of interlocking systems.

3.4.2 Electrical Tests

a. Perform contact-resistance test across each switchblade and fuseholder.

b. Perform insulation-resistance tests for one minute on each pole, phase-to-phase and phase-to ground with switch closed, and across each open pole. Apply voltage in accordance with manufacturer's published data. In the absence of manufacturer's published data, use NETA ATS Table 100.1.

c. Perform a dielectric withstand voltage test on each pole with switch closed. Test each pole to ground with all other poles grounded. Test voltage must be in accordance with manufacturer's published data. In the absence of manufacturer's published data, use NETA ATS Table 100.19.

3.5 OPERATION AND MAINTENANCE (O&M) DATA

Submit Operation and Maintenance Manuals in accordance with Section 01 78 23: OPERATION AND MAINTENANCE DATA. The O&M manual must contain all information that may be needed or useful for operation, maintenance tasks with specific instructions and associated frequencies, repair, dismantling or assembling, and for identification of parts for ordering replacements, including step-by-step operating instructions, description of individual operating parts as well as the systems as a whole, and identification of lockout/tagout points. The address, telephone, and website (if available) for the manufacturers' service organization must be clearly identified in the manual.

Manuals must contain the following information for the switch, operators, and any accessory equipment included therewith:

a. Complete instructions covering the operation, adjustment and maintenance of the equipment. Provide cuts or drawings showing all points where adjustments may be made.

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

c. Information and drawings on insulators provided with the switches.

d. For motor operated mechanisms, a detailed wiring diagram showing both the internal and external connections, and a complete three-pole schematic diagram for the motor-operator control scheme and auxiliaries.

3.6 CONTRACTOR-FURNISHED TRAINING OF GOVERNMENT PERSONNEL

After the disconnect switches have been placed in service, conduct a course in their theory, operation and maintenance. The course will be of 8 hours minimum duration (one full working days) for approximately eight Government employees at the project. The course must include disconnect switch, grounding switch, and motorized operator design and theory of

SECTION 33 75 10.00 26 Page 18 operation, construction of the actual switches furnished, routine maintenance, trouble analysis, any special shipping and handling procedures, and safety precautions. Perform demonstrations on the actual switches and operators furnished, to the maximum extent possible. Major overhaul procedures should be covered briefly, with greater emphasis on emergency procedures. Course material must use to the maximum extent possible, the site-specific operation and maintenance data provided in the Operations and Maintenance manuals. The Government may videotape the training sessions for future use.

3.7 SERVICES OF THE SWITCH MANUFACTURER'S ERECTING ENGINEER

*Am-1

Furnish the services of one or more erecting engineers that speak, read, and write fluently in the English language and has been trained by the disconnect switch manufacturer in the installation of the disconnect switches furnished under this contract. The erecting engineer willl supervise and be responsible for the testing, erecting, starting, and operation of the equipment until field tests are completed and the equipment is ready for normal operation. The work and operations of the erecting engineer must be coordinated with the program of installation construction at the job site.

Furnish the services of one or more erecting engineers that speak, read, and write fluently in the English language and has been trained and has documented experience in the installation of the disconnect switches of similar ratings as those furnished under this contract. The erecting engineer will supervise and be responsible for the testing, erecting, starting, and operation of the equipment until field tests are completed and the equipment is ready for normal operation. The work and operations of the erecting engineer must be coordinated with the program of installation construction at the job site. If the approved erecting engineer is a subcontracted employee of the switch manufacturer or a NETA-certified technician employed by a subcontractor, the erecting engineer need only be on site to supervise the installation of the first disconnect switch of each voltage class and train the Contractor's supervisory installation electrician in proper installation. The erecting engineer must do likewise on site for the commissioning of the first disconnect switch of each voltage class. Submit for approval the Erecting Engineer's Qualifications including documentation of certification or past experience. As a minimum, a qualified erecting engineer must meet at least one of the following criteria:

a. Be employed and certified by the switch manufacturer for the purpose of supervising, inspecting, and testing the disconnect switches provided.

b. Be a NETA-certified technician employed by either the Contractor or a subcontractor with at least three years' experience of inspecting or supervising 230kV electrical installation and/or a minimum of three jobs supervising the installation of disconnect switches rated at least 230kV.

c. Be a supervisory-level or other similarly documented electrical position employed by the Contractor, having had at least five years' experience of inspecting or supervising 230kV electrical installation and/or a minimum of five jobs supervising the installation of disconnect switches rated at least 230kV. In this case, the erecting

SECTION 33 75 10.00 26 Page 19 engineer need not be NETA-certified.

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