Spec_B.docx

Attachment B Equipment Standard

WAPA ES 8.1

Disconnect and Interrupter switches

SUBSTATION - ELECTRICAL

EQUIPMENT SPECIFICATIONS

WAPA ES 8.1

DISCONNECT AND INTERRUPTER SWITCHES

WAPA ES 8.1 - DISCONNECT AND INTERRUPTER SWITCHES

JULY 2011

TABLE OF CONTENTS

WESTERN AREA POWER ADMINISTRATION

WAPA ES 8.1 STANDARD SPECIFICATIONS

DISCONNECT AND INTERRUPTER SWITCHES

8.1 - i

8.1.1 GENERAL: This standard is for outdoor disconnect and/or interrupter switches as specified in the bidding item descriptions. Disconnecting switches (including selector switches) and interrupter switches shall be furnished in accordance with the applicable parts of these specifications, and except as specified herein, shall be manufactured and tested in accordance with applicable NEMA publication No. SG6 for Power Switching Equipment, applicable ANSI C3730 thru ANSI C37-38, and IEEE C37.34. Only new equipment of current manufacture shall be furnished.

8.1.2 MATERIAL:

SWITCHING DUTY: Switches shall be capable of performing the specified duties. No restrike will be permitted under any interrupting requirements. (Note: A restrike is defined as any current conduction between main contacts following an interval of one-fourth cycle or more duration.)

SWITCH POLE CONSTRUCTION (GROUP-OPERATED SWITCHES): Switches shall be suitable for the specified ratings.

Contacts: Main blade and grounding switch contacts shall be self-aligning, self-wiping contacts. Fixed contacts shall be backed by stainless steel, beryllium copper leaf springs, or be of the reverse current loop shape which eliminates contact burning under fault conditions. Current-carrying path shall not be through any spring. If the current path is through a moving pin, means shall be provided to maintain continuous positive contact pressure on the pin. The shape and material used for contacts shall be such that there will be no galling of contact metals when switch is subjected to 1,000 close/open operations.

Main Switch and Grounding Blades: The blades shall be of hard-drawn copper or aluminum alloy for carrying the specified continuous and short-time currents. Stops, if required on the individual poles, shall be furnished as described in section 3) below. If the blades are attached to castings, the blades and castings shall be connected by welding or by a bolted clamp. A press fit between blade and casting is not acceptable. Main blades of switches shall be counterbalanced to prevent them from falling closed from any position. If spiral springs are used on the hinge end of switch for counterbalancing, the housing shall be designed so that ice cannot build up on spring to impair switch operation. Pressed fits joints shall not be subjected to spring pressure during any part of a switch operation.

The movement of manually group-operated grounding blades shall be in a plane parallel to the main blades. Except for V-type switches, the tip of blades when in the open position shall not extend beyond the base of the switch in a direction parallel to the main blades.

Hinge- and Clip-End Assemblies: Pole unit castings shall be of bronze or aluminum alloy. Bearings in the hinge-end operating levers shall be of the ball, roller, Oilite-sleeve, plastic, or ball-and-socket type. Bearings shall be firmly fixed in place and shall not require replacement or maintenance before performing at least 1,000 operations. Stops shall be provided in the clips-ends of vertical-break switches, and the switch adjustments shall provide for blades to rest against the stops in the closed position.

Rotating Insulator Bearings: Bearings for the rotating insulator stacks shall be of the tapered-roller or double-ball type. If of the latter type, the bearings shall be of the combination radial and thrust type. Bearings shall be provided with a readily adjustable take-up adjustment.

Bases: The bases of switches shall be of metal members of sufficient stiffness to prevent excessive deflection when mounted and operated on supporting structures. Lattice-girder-type bases will not be permitted. Steel material required for the bases shall be galvanized.

Bearings: Ball or roller bearings shall be the sealed, permanently lubricated type or of the type that does not require lubrication, with stainless steel balls or rollers and races.

Construction of Interrupter Switches: The interrupter unit of interrupter switches shall be of the type that confines the arc in an enclosed arcing chamber. If of the oil type, each unit shall be furnished complete with oil, a liquid level gauge, and provisions for filling, draining, and sampling the oil. If of the gas-filled type, each unit shall be furnished with a gas-pressure indicator visible from the ground which will indicate when gas pressure decreases to a point where further loss would impair interrupting performance.

Assembly: Each pole of each switch without insulators shall be completely assembled at the factory for shipment.

OPERATING MECHANISMS (GROUP-OPERATED SWITCHES): Operating mechanisms shall effect a smooth, thoroughly controlled movement throughout the entire opening and closing cycles and all rods, shafts, pipe linkages, connectors, operating levers, supports, and fittings shall show no noticeable deflection. Cable connections in lieu of rigid interphase rods are not acceptable. Means shall be provided on each switch for taking up loose motion in each part of the mechanism and for adjusting the travel of each blade independently. The design of the mechanism shall be such that the main blades are positively toggled when in the fully open or fully closed position. Each switch shall be equipped with adjustable stops for the open and closed positions. The closing stops shall position each blade such that maximum contact pressure will be achieved between the moving and the fixed contacts. When the switch is in the fully closed position, the hinge- and clip-end contacts on each side of the main blades shall be horizontal within plus or minus 5° for vertical-break switches. If stops are required on each pole to meet this limitation, individual, adjustable stops shall be furnished. With the closing stops adjusted for proper closed position of each blade, the three blades of each switch, when fully open, shall conform in position within 5° of the manufacturer’s specified open position. The stop adjustment method shall include means, such as by jam nuts or piercing set screws, to prevent unintentional change in the adjustment.

Embossed- or stamped-metal indicators shall be provided on the vertical operating rod showing when the switch is open or closed. The indicators shall be approximately 7 1/2 inches high and 1 1/2 inches wide, the “closed” indicator painted red and the “open” indicator painted green. The indicators shall be mounted at normal eye level and positioned so that the appropriate indicator directly faces the operator when he is in a normal position for operating the switch. If an auxiliary icebreaking handle is furnished, the open-close indicator shall be located above the disconnecting coupling in the vertical operating rod.

Provisions shall be included for locking the switch in either the open or closed position. The outboard or offset bearing of each mechanism shall include: a cast-metal or fabricated steel housing and crank arm, a steel shaft, and either ball or roller bearing.

1. Manually Group Operated: The length of lever-type operating handles, when furnished shall not exceed 3 feet 0 inch. The force required to operate any manual mechanism shall not exceed 50 pounds. Manually operated main blades, including those using gear mechanisms, shall be capable of being opened and closed under icing conditions when specified, and this capability shall be demonstrated by the ice tests specified in section 8.1.3, paragraph 1.(3). If auxiliary swing handles are required to perform as required under the ice tests, one such handle shall be furnished with each switch. The auxiliary handle shall be readily attachable and detachable and the gearbox disengaged by a method other than removal of driven pins or setscrews when the switch is operate by the icebreaking handle.

The attachment point of operating handles to control rod or pipe and of cranks to operating mechanisms shall be at 40 inches above bottom of the base-supporting structure.

Provisions shall be included for locking the switch in either the open or closed position. The outboard or offset bearing of each mechanism shall include: a cast metal or fabricated steel housing and crank arm a steel shaft, and either ball or roller bearing.

Motor Operated: Each 3-pole motor operated switch shall be operated by one motor for use in operating all three phases simultaneously. The switches shall be operable by local and remote electrical control and by manual handle. Limit switches shall be provided to prevent over travel. During operation of a disconnecting switch, the control shall keep the motor loaded continuously to prevent the mechanism from alternately leading and lagging the motor.

The motor and control circuits shall operate from the voltage available at the motor operator, considering conductor voltage drop. Unless specified otherwise, the motor and control voltage is the 125-V dc battery that has a voltage range of 105 to 140 V at the battery terminals. The electric control shall be completely wired.

Motor-operated switches shall be capable of being opened by their motor under ice conditions and this capability shall be demonstrated by the ice test specified in section 8.1.3, paragraph 1.(3). It is desirable that the switches be capable of also being closed by the same mechanism under the iced conditions. However, closing by manual means under iced conditions will be permitted, provided that a readily attachable manual handle is furnished and means provided for easily detaching the motor mechanism.

Indication of the disconnecting switch position shall be readily visible from the ground, and means of preventing false indication if the blade fails to complete the opening or closing operation shall be furnished. A manual handle socket shall be permanently installed, and handle furnished, with means of disengaging the motor mechanism by movement of the manual handle.

The following features shall be included:

Local control “OPEN”, “CLOSE”, and "STOP” switches.

Local-Remote [Device 43] Selector Switches: Each mechanism shall be equipped with a separately mounted, manually-operated, “Local-Remote” selector switch. Each “Local-Remote” switch shall be furnished with the following minimum numbers of electrically separate contacts wired in the control circuits or to outgoing terminal blocks are required:

A minimum of six contacts that close in the “Remote” and open in the “Local” position to disconnect the following circuits:

One contact in the remote closing circuit.

One contact in the remote opening circuit (including remote red lamp). One contact for each opening coil.

One contact wired to the “b” contact for the remote green lamp.

One contact wired to the auxiliary switch “a” and “b” contacts provided for supervisory control (Scada) position indication. One “a” contact and one “b” contact shall be wired together at one end, and that end connected to the “Remote” contact, allowing the “Remote” contact to disconnect both the “a” and “b” contacts.*

* The “a” and “b” contacts are the auxiliary switches required by section 6. below.

Two contacts for future use, wired to external terminal block points.

A minimum of four contacts that close in the “Local” and open in the “Remote” position:

1. One connected to the local close switch.

One connected to the local open switch.

Two contacts for future use, wired to external terminal block points.

A fused knife switch, readily detachable fuse clip assembly, or circuit breaker shall be installed in each cabinet as over current protection and disconnect device for the cabinet heaters, convenience outlet and the motor power circuit.

Provide form “C” loss-of-voltage/under voltage alarm contacts to indicate loss of dc and ac control, heater, and motor voltage at the load side of any local fused-knife disconnect switches, detachable fuse clip assembly, or circuit breakers. Separate alarms shall be provided for ac and dc circuits. The ac alarm shall have a time delay of approximately 10 seconds.

Operation Counters (Motor Operated Interrupter Switches): Each motor-operated interrupter switch shall be furnished with an electric operation counter mounted inside the cabinet. The counter shall have a minimum 3-digit readout and shall register once for each complete open-and-close cycle.

Outlet: Each motor-mechanism cabinet shall contain a convenience outlet. The outlet shall be weatherproof, separately fused, 20 amps, 125 V, 2 pole, 3 wire, polarized duplex, grounded with a built-in ground-fault interrupter. The outlet shall have provisions for test and reset of the ground-fault interrupter. The outlet shall be Pass & Seymour/Legrand Catalog No. 2091, or equal, and mounted so it shall be available for use from outside the cabinet without opening the cabinet door.

Cabinet heaters shall be for use on a 230-V, single-phase, ac power supply and be thermostatically controlled. The heaters shall have guards to protect personnel from burns and electrical shock.

SUPPLEMENTAL STEEL MEMBERS: The Contractor shall furnish supplemental steel members required to secure the switch-operating mechanism to the switch-supporting structure without drilling any tubular member in the supporting structure. The steel members required for mounting the operating handle or gearbox assembly for the switches shall extend the full length of lattice steel supporting structure and shall not be terminated on an intermediate bracing member.

GALVANIZING: Exposed steel material required for the operating mechanisms and supplemental steel members required to secure the mechanisms to the supporting structures shall be galvanized.

AUXILIARY SWITCHES: When specified, switches shall be equipped with an auxiliary switch or the equivalent thereof having at least 10 independent single-pole auxiliary switches which can be changed readily to “Circuit opening” or “Circuit closing”. These switches are for use by Western and are in addition to those used by the manufacturer for the motor operator control scheme. Each auxiliary switch shall be mechanically actuated by the operating mechanism of its associated switch and shall follow the position of the switch. Each set of auxiliary switches shall be mounted in a weatherproof metal housing with a conduit entrance for 1 1/2-inch rigid conduit. Auxiliary switches shall be insulated for 600 V, have contacts with a minimum continuous current rating of 10 amps, be readily adjusted without disassembly (either continuously or in not greater than 15°increments) form “circuit opening” to “circuit closing”, and have an interrupting capacity in an inductive circuit of at least 2 amps at 125 V dc and 20 amps at 120 V ac.

The furnishing of 16 nonadjustable and two adjustable single-pole auxiliary switches is an acceptable equivalent to furnishing the 10 adjustable single-pole auxiliary switches described above.

INSULATORS: Unless otherwise specified, all insulators shall be gray in color and in accordance with ANSI Standards C29 and/or NEMA publication No. HV1 for high-voltage insulators.

OPERATING MECHANISM BONDING (GROUP-OPERATED SWITCHES): A copper braid shall be furnished for bonding operating mechanism to a switch-operating platform.

INTERLOCKS (GROUP-OPERATED SWITCHES): For other than interrupter switches, a mechanical interlock, arranged so the main blades grounding blades mounted on the same switch base cannot be closed at the same time, shall be provided. The mechanical interlock shall be of the type that is automatically positioned by the relative positions of the operating mechanisms. For interrupter switches a key interlock shall be provided so that grounding blades cannot be closed when main blades or interrupters are closed.

Key interlocks, when specified, shall be located on vertical operating rods above disconnecting couplings for any icebreaking handles and arranged so that the grounding blades on one switch and the main blades on a separately mounted switch cannot be closed at the same time. Key shall be removable in open position only.

Electrical interlocks, when specified, shall be furnished on the operating blade mechanism of all motor operating disconnect switches. The controls of each motor operated disconnect switch shall be wired to external terminal block points to accommodate an electrical interlock with associated power circuit breakers. The electrical wiring to the external terminal block shall require at least four terminal block points, with two points needed for wiring from each of two power circuit breakers. The disconnect switches shall not be electrically operable (opened or closed) locally nor remotely unless the associated power circuit breaker is open. This would be done by using an auxiliary "b" contact from the associated power circuit breakers.

TERMINALS: Terminals shall be standard line terminal pads conforming to the requirements of NEMA CC1-1993.

GROUNDING: Grounding pads in accordance with ANSI C37.12 shall be provided. In addition, each grounding pad shall be provided with a clamp-type terminal connector suitable for No. 4/0 to 500 kcmil cable.

8.1.3 TESTS (GROUP OPERATED SWITCHES): Applicable tests listed below shall be performed at the factory or other facilities available to the manufacturer. One switch of each type, voltage, and current rating furnished under these specifications shall be tested per the design tests. Design tests on switches identical to those being furnished under these specifications will be accepted. Ice testing will also be accepted on a higher-voltage-rated switch, provided the switch tested is the same in all the following respects as the switch being furnished:

Clip- and hinge-end mechanism Blade material and cross section Interrupter unit type Motor operator

1. DESIGN TESTS: The basic design of the switch furnished shall have met the requirement of this Subdivision in tests previously performed, or the Contractor shall perform the tests specified in this Subdivision for the switch. If identical switches have been previously tested as below, the Contractor may omit tests and furnish certified copies of reports of results of such previous tests.

1. Mechanical Design Life Test for Interrupter Switches: The basic mechanical design of the interrupter switch and operating mechanism being furnished shall be proved by not less than 1,000 close-open operations at the factory, at recommended contact speeds. These operations shall be performed on a completely assembled 3-pole [interrupter] switch with recommended spring and contact adjustments. Certified test reports shall be furnished which shall certify that the operations were accomplished without failure of any component part and without mechanical difficulties. At the successful completion of this design test, the switch shall be capable of being brought within optimum mechanical adjustment and shall be in satisfactory mechanical condition without replacement of component parts. These tests shall be performed on an identical separate test switch for which certified test reports will be acceptable. Such tests shall not be performed on an actual switch to be furnished to Western under this or any other contract.

Temperature Rise Tests: Temperature rise test in accordance with IEEE C37.34-1994, Section 6. This test shall be performed on the main blade and components and interrupter unit of a single pole. The temperature rise test report shall include a diagram indicating the points on the switch where the temperatures are determined and the composition of the switch material, including type of plating on contact surfaces at these points.

Ice Test: Ice testing in accordance with IEEE C37.34-1994, Section 10. The test shall be a 3-pole test and shall be performed on an assembled switch including the main blades, interrupter units, and grounding blades when furnished. The switch under test shall be mounted horizontally upright. Interphase connections and connections between the group-operated switch and manual handle or power unit may be shortened to suit conditions. A switch equipped with stacked insulators may be tested with only one unit per stack except switches with ground blades shall be tested with full stacks. The switch shall be tested with the same type operating mechanism and with the use of the same type handle, gear, power unit, etc. as furnished under the contract. Hammering on the blades, operating mechanism, or pipe is not permitted during any part of this test.

PRODUCTION TESTS: The switches shall be subjected to and pass the manufacturer’s standard production tests, which shall include:

1. Leak Test: Each porcelain-clad interrupter unit shall be subjected to a test to disclose leaks.

Operating Speed Test: Each interrupter unit shall be completely assembled and checked for proper operating speed.

Dielectric Test: The completely assembled control circuit shall be given a dielectric test in accordance with Industrial Control and Systems, NEMA publication No. ICS 1-109.20.

SEISMIC QUALIFICATION: When seismic qualification is required, data and requirements shall be provided in accordance with the latest IEEE 693. The data required on metal tags to be attached to equipment may be provided on equipment nameplate. A seismic report is not required for the low seismic performance level.

8.1.4 DRAWINGS AND DATA:

1. GENERAL: Drawings and technical data required to be furnished by the Contractor shall be in English, with dimensions in feet and inches, weight in pounds, and volume in cubic feet or cubic inches.

The drawings and data shall be complete and accurate in their content. Originals and all copies shall be legible. Drawings shall be prepared using drafting equipment, shall be drawn to scale, and shall have neat lettering. Freehand sketches will not be accepted. Western will require 40 calendar days to answer correspondence pertaining to each submittal of data or drawings. Original drawings prepared under this contract will remain the property of the Contractor.

Schematic and wiring diagrams shall have graphical symbols and device function numbers conforming with the latest applicable standards of ANSI Y32.2/IEEE 315, ANSI/IEEE 315A, and ANSI C37.2.

Reproducible prints shall be of such quality as to permit clear, sharp, legible prints or other reproductions to be made by direct contact methods.

Western shall have the right to require the Contractor to make any changes in the drawings and data that may be necessary to show the equipment furnished conforms to the requirements of the specifications and these standards. The design and coordination of this electrical equipment shall be the responsibility of the Contractor and Western assumes no responsibility to approve or review drawings and data that are submitted. Western’s review of the Contractor’s drawings shall not relieve the Contractor of meeting all requirements of these specifications or for the correctness of his drawings. Revised drawings shall show revision dates and all changes and revisions circled on the drawings. Drawings shall not exceed 22 inches in height by 36 inches in width.

Procurement and construction specifications include the delivery times, quantities, and destinations for drawings and data submittals. The following Table – A shows the normal delivery time and quality requirements.

TABLE-A

DRAWINGS AND DATA SCHEDULE

8.1.4 Paragraph Delivery Time (Calendar Days)

Prints

* Furnish one print of each final drawing with each copy of instructions.

† Seismic qualification report may be submitted within 150 calendar days after date of contract award, if equipment not previously qualified per latest IEEE 693. A seismic report is not required for the low seismic performance level.

INSTALLATION DRAWINGS AND DATA: The required delivery time and quantity of installation drawings and data are listed in Table-A. The installation drawings and data are required to prepare final design of foundations and, when applicable, support structures. Drawings and data required include all of the following that are applicable:

1. Outlines, dimensions and weights of equipment and, when applicable, associated support structure.

Base type, dimensions, and mounting details.

Location, types, sizes, and projections of required embedded anchor bolts or material. The Government will furnish the foundations, anchor bolts, and embedded material.

Orientation of all equipment and a complete anchor bolt setting plan.

Seismic qualification report, in accordance with IEEE 693.

INFORMATIONAL DRAWINGS AND DATA: The required delivery time and quantity of informational drawings and data are listed in Table-A. The drawings and data shall:

1. Include outlines, details, schematic diagrams, wiring diagrams, and instructions.

Specifically verify conformance with equipment requirements.

Be sufficiently complete to allow preparation of final design and installation drawings including wiring diagrams.

FINAL DRAWINGS AND DATA: The minimum delivery time and quantity of final drawings and data are listed Table-A. The drawings and data shall include the following:

1. Final Drawings for the Equipment: The drawings shall show all changes, and revision dates therefore, made up to the time the drawings and data are furnished.

Final drawings shall be furnished, rolled or flat, not folded. Drawings shall be printed on quality bond paper; be full-size; and be clear, sharp, and legible.

Final drawings shall include the following:

Outlines.

Mounting of switches and operating mechanisms.

Control and schematic wiring diagrams.

Control cabinet physical layout drawing (showing the layout of all components in the cabinet).

Nameplate drawing.

1. Sets of Parts Identification Lists or Bills of Materials for the Equipment: Each part shall be assigned an identifying number which can be used for ordering replacements, and a reference number that locates the part on the appropriate outline drawing.

Sets of manufacturer’s instruction books or pamphlets covering installation, operation, and maintenance repair for the equipment and for each device appurtenant to the equipment. A print of each final drawing as required above shall be included in the instruction book.

g. Test reports required for the electrical equipment shall be furnished prior to shipment of the equipment. The Contractor shall furnish certified copies of all test reports. Any equipment which does not successfully pass the testing requirements will be rejected.

RIGHT TO USE CONTRACTOR’S DRAWINGS: Western expressly reserves the right to use, to reproduce in whole or in part, to distribute, and to reuse any and all such drawings, whether copyrighted or not, in connection with the following:

1. Installation, maintenance, replacement, and repair of the articles to be furnished under this contract.

Making any and all such drawings and reproductions thereof available to subsequent bidders and Contractors, where necessary, for fabricating and furnishing articles connected with or dependent upon information shown on the drawings and duplicating the drawings to be furnished hereunder.

The depositing of all such drawings with Western shall constitute a license to Western to use said drawings in the manner hereinabove stated.

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