Spec_A_Updated.doc

Attachment A

Disconnect Switches for Alcova Substation

DE-SOL-0007306

DE-SOL-0007306

Alcova Substation Group-Operated Air Break Switches Material Specification 1 Scope

This material specification states the requirements for 5 (five) each 3 pole, vertical break group-operated selector (tandem mounted) air switches with grounding switch and 6 (six) each vertical break, group operated air 115kV nominal, 2000 ampere switches to be purchased by Western Area Power Administration for application in the Alcova Substation. The switches operate at an elevation of approximately 5,361 feet.

2 Applicable Documents

Except as required otherwise by this material specification, the air switches and tandem mount air switches with associated grounding switches, specified herein shall be furnished in complete accordance with the latest applicable industry codes, ANSI, IEEE, and NEMA standards, OSHA requirements, and Western Area Power Administration standards and material specifications in effect on the date of the request for quote, WAPA ES 8.1 Disconnect and Interrupter Switches.

2.1 Industry Documents

Applicable industry documents may include, but shall not necessarily be limited to, those listed below.

ANSI/IEEE C37.30, Definitions and Requirements for High Voltage Air Switches, Insulators, and Bus Supports

ANSI/IEEE C37.34, Test Code for High Voltage Air Switches

3 General

3.1 Application Information

This material specification along with Western Area Power Administration Equipment Specification WAPA ES 8.1 Disconnect and Interrupter Switches states both the general requirements for group-operated air switches and the switch-specific requirements that vary depending on installation and intended use at the Alcova Substation:

Selector/Tandem Switches are:

a. A 261 (YY6M) and A 265 (YY6A) with common grounding switch A 260 (ZY6C).

b. A 561 (YY5M) and A 565 (YY5A) with common grounding switch A 560 (ZY5C)

c. A 661 (YY8M) and A 665 (YY8A) with common grounding switch A 660 (ZY8C)

d. A 861 (YY9M) and A 865 (YY9A) with common grounding switch A 860 (ZY9C)

e. A 1061 (YY10M) and A 1065 (YY10A) with common grounding switch A1060 (ZY10C) Selector/Tandem switches shall be mounted on the same base.

Single Switches are:

a. A 263 (WY6M)

b. A 563 (WY5M)

c. A 463 (WY7M)

d. A 663 (WY8M)

e. A 863 (WY9M)

f. A1063 (WY10M)

4 Design and Manufacturing Requirements

4.1 Type

a. The tandem mounted air switches and associated grounding switch, specified in 6.6, shall be three-pole, single-throw, group-operated devices.

b. The single air switches shall also be three-pole, single-throw group operated devices.

4.2 Terminals

The air switch shall be equipped to accept a 4-inch by 4-inch NEMA-standard terminal pad with both NEMA four hole and two hole patterns on switch center line at both hinge and jaw ends, suitable for terminal connectors on both pad surfaces. Copper terminal pads, if any, shall be tin plated to 0.001 inch.

4.3 Arcing Horns

All switches shall be furnished with the manufacturer’s standard arcing horns and tips.

4.4 Insulator Strength

All insulators supplied shall be standard strength unless stronger insulators are specified or required by supplier’s design. Also all insulators shall be gray in color and in accordance with ANSI Standards C29 and/or NEMA publication No. HV1 for high-voltage insulators.

4.5 Mounting Hardware and Other Equipment

The switch shall be shipped complete with mounting hardware, operating linkage, and all other parts required for installation and successful operation on the structure shown on the drawings specified in 6.3. This is to include new galvanized steel members to support the operating handle mechanisms, mechanical/key interlocks and vertical operating shaft guides as required. The mounting hardware, leveling method and operating linkage shall be designed so they can be easily bolted (not welded) to the steel structure. The leveling method shall be designed to use a screw-jack principle or shims to provide accurate leveling of the installed air switch.

4.6 Switch Interlocks

A mechanical interlocks shall be provided for the selector/tandem switches so the main blades and ground blades mounted on the same switch base cannot be closed at the same time. The mechanical interlock shall be of the type that is automatically positioned by the relative positions of the operating mechanisms. A chain type or cable type of mechanical interlock is not acceptable.

4.7 Conformance to Western Standard

The rest of the design and manufacturing requirements will comply with Western Equipment Specification WAPA ES 8.1 Disconnect and Interrupter Switches.

5 Drawings and Other Information

The supplier shall provide to the engineering document control person named in the terms and conditions of the attached solicitation DE-SOL-0007306 and 6.1.2 of the Specification per WAPA ES 8.1, pages 8.1-7 to 8.1-9 and an instruction book shall be attached to the air switch in a waterproof envelope. AutoCAD drawings up to version 2013 or Word or Excel documents will be considered acceptable.

6 Air Switch – Specific Requirements The air switch information and specifications in this section are for the items in the Solicitation DE-SOL-0007306, and shall be used in conjunction with the other requirements of this material specification.

6.1 Equipment Identification and Order Requirements

6.1.1 Equipment Identification

Equipment numbers:

a. A 261, A 265, A 260: A 263

b. A 561, A 565, A 560: A 563

c. :A 463

d. A 661, A 665, A 660: A 663

e. A 861, A 865, A 860: A 863

f. A 1061, A 1065, A 1060: A 1063 Location: Alcova Substation Project number: A 0031B

6.1.2 Technical Application Questions

Technical questions regarding this material specification, or notice of any other technical matters which arise during the quote process or during equipment design, manufacture, or test shall be directed to the Contracting Officer.

6.1.3 Drawing Destination

All drawings and other information specified in section 5 shall be mailed to the person in the office below:

C. S. Engstrom

Western Area Power Administration 5600 Poison Spider Road

Casper, Wyoming 82604

6.2 Action Type

The air switch action type shall be provided below:

a. 5 each, 3 pole, vertical break, gang operated, selector switch (tandem mount), horizontally mounted with arcing horns combined with a grounding switch. This disconnecting switch shall have two blades per pole, with each blade hinged at an opposite end of the base, and with a common clip stack of insulators located at the center of the base. Each set of three gang-operated, single-throw blades shall have an individual operating mechanism.

b. 6 each, 3 pole, vertical break, gang operated disconnect switches horizontally mounted with arcing horns.

6.3 Alcova (A) Structures

The following drawings are attached:

Drawing numbers:

A 1011

115kV Bus Structure - Plan

A 1013

Equipment Key Plan A 1112

Section D-D Elevation Bay Y7 A 1113

Section E-E Elevation Bay Y8 & Y9 A 1015

Section F-F Elevation Bay Y10 A 1116

Section C-C Elevation Bay Y5

A 1118

Section B-B Elevation Bay Y6 A 2025 115kV Switch Supports (Types III and IV—phase to phase spacing is 7’ 0”). The switch base drilling shall be 4.125” on either side of switch pole center line for all switches. All operating handles for the selector/tandem switches shall be on the East side of support structure. Single disconnect switch operating handle shall be one the Northwest corner of the switch support.

6.4 Voltage and BIL Ratings

The air switch shall be rated for 115kV system with a Basic Insulation Level (BIL) rating of 550kV at 3300 feet above mean sea level.

6.5 Air Switch Current Ratings and Temperature Rise

6.5.1 Continuous and Momentary Current Ratings

The continuous and momentary current ratings of the air switch shall be at a minimum:

2000 continuous amperes; 70,000 momentary amperes (14,000 A peak)

6.5.2 Temperature Rise

The temperature rise of switch components at rated continuous current shall be in accordance with IEEE C37.34-1994 or most recent version.

6.6 Grounding Switch

A grounding switch shall be provided with the tandem mount air disconnect switches. The requirements in 6.6.1 through 6.6.3 shall apply.

6.6.1 Location

The location of the grounding switch contact on the air switches shall be on the center common jaw point.

6.6.2 Interlock

A mechanical interlock shall be provided with the tandem mount disconnect switches.

6.6.3 Momentary Rating

The minimum rated momentary current of the grounding switch contacts shall be: 70,000 amperes.

6.7 Wind Design Requirement

The disconnect switches shall be designed to meet or exceed the wind loads specified in the latest version of ASCE-7, using an importance factor of 1.15, Exposure C, and a minimum basic wind speed of 90 miles per hour.

6.8 Ice Breaking Design Requirement

3/4 inch (19 mm) clear ice, based on ice testing per Spec B - Equipment Standard 8.1.3.e.

6.9 Operating Mechanism Type:

The switch operators shall be manual swing handle operator. Refer to Specification B - Equipment Standard ES 8.1, paragraph 8.1.2.3.a.