PowlVac 38 Metal-Clad Switchgear Guide Specification



GeneralThe intent of this specification is to have the manufacturer furnish the equipment and material specified herein complete and operable.All standard accessories to the equipment specified shall be supplied even if not specifically mentioned in this specification.Material used in the fabrication of the specified equipment shall be new, unused, and of the highest quality available.ScopeWork IncludedFurnish metal-clad switchgear as detailed in Sections 3.0 through 12.0 of these specifications. Any drawings or data sheets attached to the inquiry shall be considered part of this specification. The equipment shall be complete and operable.Provide production tests and inspections as detailed in Section 13.0 of this specification.To reasonably prevent the possibility of shipping damage, the manufacturer shall prepare the equipment for transportation to the jobsite and monitor the load out of this material.It shall be the responsibility of the manufacturer to furnish all material, connections, splices, links, special tools, and information required to completely reassemble the switchgear in the field or to facilitate the installation of the switchgear when performed by an electrical contractor.Guarantee the performance of the switchgear during a reasonable warranty period. This warranty shall, at a minimum, cover the equipment for eighteen (18) months from time of shipment or twelve (12) months from date of energization whichever occurs first.Supply all drawings, documentation, and information detailed in Section 14.0.Work Not IncludedField installation of switchgear, unless otherwise specified.Connection of incoming cables or bus.Connection of outgoing branch feeder cables or bus.Connection of external control cables or wiring.Applicable Codes and StandardsThe applicable codes and standards listed below should be considered as part of this specification. The latest revision in effect at time of inquiry shall apply for all standards referenced.National Electrical Manufacturers Association (NEMA)Institute of Electrical and Electronic Engineers (IEEE)National Electric Code (NEC)American National Standards Institute, Inc. (ANSI)ANSI C37.04ANSI C37.06ANSI C37.09 ANSI C37.20.2Canadian Standards Association (CSA)International Electrotechnical Commission (IEC)IEC 56 – High-voltage alternating current circuit breakers - 1987It shall be the manufacturer's responsibility to be knowledgeable of these standards and codes.Service and Environmental ConditionsUnless otherwise specified this equipment is intended for use in ambient temperatures that do not exceed a maximum of 40°C (104°F) or a minimum of -30°C (-22°F).This equipment is intended for use in an area where the elevation is less than 3300 feet above sea level. Above 3300 feet a de-rating factor as prescribed by ANSI standards will apply.The switchgear shall be installed in a clean environment that is relatively dust free.The switchgear and major components shall be tested and certified to meet all applicable seismic requirements of Uniform Building Code (UBC) at the installation site. The installing contractor shall follow mounting and installation guidelines as specified by the manufacturer. Basic ConstructionThe equipment supplied shall be of metal-clad construction using welded or bolted sheet steel. The construction shall be self-supporting and free standing. All metal work shall be free from burrs and sharp edges.The equipment shall be suitable for industrial or utility service and constructed with an enclosure as specified on the drawings or data sheets.Each front and rear compartment door shall be provided with a formed steel hinged door with hand operated door latches. Each door shall have provisions for padlocking.The switchgear shall be capable of extension from either end at a future date without modification to existing structural members.It shall be the manufacturer's responsibility to coordinate all necessary alignment and interconnection between component sections. The entire assembly must be electrically and mechanically assembled into one single line-up prior to final inspection and shipment.The equipment must be shipped complete, without missing components or "ship shorts". Purchaser may waive this requirement upon request prior to shipment.To facilitate ease of handling each shipping section will be no more than two (2) vertical structures. Each shipping section shall be provided with lifting lugs adequately sized for the equipment.Power circuit breakers shall be shipped and packaged separately from the switchgear structure unless equipment is installed within a PCR? (Power Control Room).Louvers may be provided in the switchgear for ventilation or cooling purposes. These openings shall be filtered upon request to retard the entrance of dust. Filters shall be easily removable for maintenance. Louvers and filters, when present, shall be located on the front and rear doors.The depth of the finished equipment shall be sufficient to allow for entrance, bending, and termination of power cables. Individual units shall be provided for top or bottom entrance as specified. A minimum of 38 inches of clearance between terminal pads and the cable entrance shall be provided.Each switchgear cubicle shall have, at a minimum, 11 gauge sheet steel side panels. This provides two (2) steel sheets between adjacent sections so as to minimize the chance of fault propagation between sections.Main bus pass through insulators and main bus stand off insulators shall be molded cycloaliphatic epoxy.The main bus joints shall be insulated using vinyl joint cover boots with re-useable hardware.Main bus can be 1200A, 2000A or 3000A rating.All bus shall be covered with epoxy insulation system that is flame retardant and track resistant.Power circuit breakers and voltage transformer assemblies shall be drawout construction to provide maximum operator safety.Safety interlocks and barriers as required by ANSI standards shall be provided to prevent personnel from inadvertent exposure to the bus while the switchgear is energized.A continuous silver-plated or tin-plated copper ground bus measuring ?" x 2" shall be provided for the full length of the switchgear assembly. The ground bus shall be capable of carrying the rated short circuit current of the installed circuit breakers for a minimum of 2 seconds.In order to minimize condensation, each cubicle designed for outdoor application shall have a space heater. Space heaters may be wired with other space heaters in parallel and shall be provided with a single adjustable thermostat to maintain cubicle temperature at desired levels.Power Circuit BreakersThe power circuit breakers shall be electrically operated, three-pole, drawout type. The interrupting medium shall be vacuum.The circuit breakers shall have an ANSI rating structure based on a K factor of 1.0 and interrupting rating of 40kA rms sym.The basic insulation level (BIL) of the power circuit breakers shall be not less than 150kV.The continuous current capacity of each power circuit breaker shall be 1200A, 2000A, or 3000A as indicated on the drawings or data sheets. The 3000A shall be achieved without fan cooling.The circuit breakers are available with 5 cycles standard interrupting time or 3 cycles as an option.Primary line and load connections shall be self-aligning.The drawout mechanism shall be fully functional with the front cubicle door closed and shall hold the power circuit breaker rigidly in the fully connected position.The drawout mechanism shall require less than 25 turns to move the circuit breaker from the connected to the disconnected positions.Each circuit breaker will have four (4) wheels to allow for easy maintenance and movement.No lift truck, rails, ramps, channels, or transport device of any kind shall be required in order to move a circuit breaker from floor level to the fully connected position.Interlocks shall be provided to prevent the circuit breaker from disconnecting from the main bus stabs unless the circuit breaker is open.The power circuit breaker ground connection must be capable of carrying the short circuit rating of the circuit breaker for a minimum of 2 seconds and must also be capable of withstanding the peak current value (or 2.7 times the rated short circuit current) of the circuit breaker.A grounded metal shutter system shall automatically cover the line and load stab connections when the circuit breaker unit is moved to the disconnected position. The shutter shall be pad-lockable in the closed position.Auxiliary contacts to provide circuit breaker element position indication (Truck Operated Cell switch or TOC) and to provide circuit breaker contact position (Mechanism Operated Cell switch or MOC) shall be available when specified. Both switch operator and switch must be visible and accessible from the front of compartment when the circuit breaker is in the fully connected position.Circuit breaker operating mechanism shall be completely trip free both mechanically and electrically. Mechanical tripping of a closed circuit breaker shall be possible with the front cubicle door closed.Control power and control circuit wiring shall be connected to the power circuit breaker by means of a 24 pin front connected umbilical cord and plug. This plug shall be mechanically interlocked. The plug shall not be removable while the circuit breaker is in the connected position. The circuit breaker cannot be inserted without the plug in place.For operator safety the circuit breaker shall have provision for padlocking it in the disconnected position.Each circuit breaker shall have a mechanical operations counter.Each circuit breaker shall have an easily accessible means for contact wear indication.Each breaker shall be operated by a motor-charged stored energy spring mechanism, charged normally by a universal electric motor and in an emergency by a manual handle.The Breaker front cover shall be removable when the breaker is withdrawn for ease of inspection and maintenance.The breakers shall be electrically operated by the following control voltages.[120 or 240 volt AC close and AC capacitor trip]. AC control voltage shall be supplied by customer or derived from a control power transformer mounted in the switchgear and backed by a capacitor trip device.[48-] [125-] [250-] volt DC close and [48] [125] [250] volt DC trip. DC control voltage shall be supplied by purchaser.Each breaker shall be complete with control switch and red and green indicating lights to indicate breaker contact position.Power Bus Main power bus shall be tubular or full round edge rectangular bar type copper with silver-plated or tin-plated joints.Main power bus shall be silver-plated or tin-plated along the entire length to a thickness between 0.0001 inches and 0.0005 inches.The entire bus, except for terminations, shall be completely isolated with metal barriers and insulated with epoxy based bus insulation system.The main power bus shall be supported on molded cycloaliphatic epoxy insulators and mechanically braced to withstand stresses resulting from current values equivalent to the close and latch rating of the largest circuit breaker in the assembly.Molded cycloaliphatic epoxy inserts are required whenever bus passes through a barrier of any type.Bus joints shall be made with sufficient bolts and torqued to preserve initial contact pressure over the service life of the equipment. Bolts that are torqued to appropriate levels at the factory shall be identified with paint markings. Bolts shall be rated Grade 5 and plated for corrosion resistance.Power bus orientation shall be A-B-C top to bottom, front to back, and left to right when viewed from the front of the switchgear.Main bus can be 1200A, 2000A or 3000A. The temperature rise of the bus and connections shall be in accordance with ANSI standards and documented by design tests.A bare copper ground bus shall extend the entire length of the switchgear and be rated to withstand for 2 seconds the short circuit current rating of the lineup.Instrument TransformersCurrent Transformers (CT)Current transformers shall be installed so that they can be easily maintained or replaced from the front of the switchgear without entering the power bus or cable termination compartments. Unless specified otherwise, the polarity marking shall be toward the circuit breaker.Each current transformer shall be rated to withstand the thermal and mechanical stresses imposed by the short circuit rating of the applied circuit breaker.The secondary termination of current transformers shall be on a shorting terminal block.Current transformers shall have a rated 5 ampere secondary current unless otherwise specified.Metering and relaying accuracy classification shall be as specified in the data sheets and shall be suitable for the connected burden.Current transformers, when installed, shall be fully rated for the appropriate voltage class. Current transformers with 600 volt insulation levels may be used if installed with fully rated insulation barriers such as around primary disconnect bushing assemblies.Voltage Transformers (VT)Voltage transformers and associated fuse assemblies shall be installed in drawout assemblies so that they may be readily disengaged from the power bus.Where physical size restrictions do not allow the voltage transformer to be mounted in a drawout assembly, the voltage transformer may be stationary mounted with the fuses only mounted in the drawout unit. The appropriate interlocks shall be provided to insure maximum operator safety.When moved to the withdrawn position, the transformer drawout unit shall automatically ground the transformer primary windings and the fuses. A visible indication of positive ground is required. The ground may not be a momentary or sweeping action, but must be maintained as long as the drawout assembly is not in the connected position. The ground must be maintained even in the event of blown fuses.The voltage transformer primary connections shall utilize epoxy insulated bus bar.An insulating shutter system shall automatically cover the line and load stab connections when the voltage transformer unit is moved to the disconnected position.Voltage transformers shall have 120 volt secondaries unless otherwise specified.Voltage transformers shall have an accuracy rating comparable to the metering equipment and a burden capacity equal to twice the initial load.Current limiting fuse protection shall be provided on the primary side of each voltage transformer.Voltage transformers shall be designed to withstand the basic impulse level of the switchgear.Control Power Transformers (CPT)Control power transformers shall be fixed mounted with the primary current limiting fuses mounted in a drawout unit.When moved to the withdrawn position, the fuse drawout unit shall automatically ground the fuses. A visible indication of positive ground is required. The ground may not be a momentary or sweeping action, but must be maintained while the drawout assembly is not in the connected position.Each control power transformer shall have a secondary molded case circuit breaker interlocked with the drawout assembly so that the load is disconnected prior to drawout.All control power transformers shall be provided with one (1) 5% tap above and below rated voltage.Secondary winding shall be 120/240Vac, single phase, 60Hz, 3 wire unless otherwise specified.Control Power Transformer larger than 50kVA shall be mounted external and remote form the switchgearControl and Secondary WiringControl wiring shall be SIS type #14 AWG, 41 strand extra flexible, stranded copper or larger.Current transformer secondary wiring shall be SIS type #12 or 10 AWG, 65-strand, extra flexible, stranded copper or larger.Current transformer secondary wiring shall terminate on shorting type terminal blocks.All control wiring shall be UL listed and have a VW-1 flame retardant rating.Exposed wiring shall be suitably protected against contact with sharp edges. Throughout the assembly it must be neatly bundled and secured with nylon wire ties. Where control wiring passes from cubicle to door it must be wrapped with suitable protection so as to prevent damage. Holes cut to allow control wires to pass from cubicle to cubicle will have a grommet for protection.Splicing of control wire is not permitted. Control wiring must be a continuous length from terminal to terminal.Each control wire shall be marked at both terminations to agree with wiring diagrams. Plastic wire markers of either the slip on or heat shrink variety shall be provided.Control wires leaving the cubicle of origin must first terminate on a terminal block. No control wire may leave a cubicle directly from any other device.Control wire tags shall follow “destination method” and must match the drawings.Space heater circuits, if included, are an exception Section 9.8 above.Where possible, a minimum of 10% spare terminals shall be provided in each cubicle.Meters, Switches, and RelaysIndicating meters shall be three phase large digital display type visible 6 feet away from the front of the lineup and require minimum operator interface.Control switches shall be rotary cam type with engraved face plates.Ammeter and voltmeter transfer switches shall have an off position and shall be provided with knurled knob handles.Selector type control switches (Auto-Manual or Hand-Off-Auto) shall have oval handles.Circuit breaker control switches shall have pistol grip handles.Protective relays shall be of the type, model, and manufacturer specified by the purchaser.Current and voltage test switches for field monitoring and maintenance shall be provided when specified.Indicating lights shall be provided as shown on the control schemes. Lamps shall be replaceable from the front of the switchgear without opening the cubicle door.NameplatesLaminated plastic engraved nameplates shall be provided.Identification nameplates shall be white with black letters, caution nameplates shall be yellow with black letters, and warning nameplates shall be red with white letters.Each externally visible device or component shall have an identification nameplate. Lettering shall be, at a minimum, 5/32 inches in height.Each internal device or component shall have an identification marking.A single large permanent metal nameplate shall identify the job reference number, switchgear ratings and date and place of manufacture.FinishAll steel structure members shall be cleaned, rinsed, and phosphatized prior to painting.Coating process shall be an electrostatically applied polyester powder with a final baked on average thickness between 1.5 and 2.0 mils.Interior instrument compartments shall be White finish for enhanced visibility.All internal parts shall be painted for corrosion protection, no bare parts allowed.Standard exterior finish will be ANSI 61 light gray.Inspection and TestingEach circuit breaker shall be tested for proper adjustment and operation prior to shipment. The circuit breaker shall be given a minimum of 100 mechanical operations. Test reports shall be available upon request.Each vacuum interrupter shall receive a vacuum integrity test by means of the system ac high potential test prior to shipment.Each circuit breaker shall have a contact timing and contact motion velocity test.Each circuit breaker shall be identified with an individual serial number permanently mounted on the breaker by means of a metal nameplate.Manufacturer shall maintain permanent records of each circuit breaker produced and the production test ponent bill of material shall be checked for proper quantity, description, and part number.Physical dimensions shall be checked against approved drawings.Equipment shall be subjected to a primary current injection procedure to determine proper operation of all current sensitive components.Equipment shall be subjected to a primary voltage injection procedure to determine proper operation of all voltage sensitive plete assembly shall have a low frequency withstand (an ac high potential) test performed to assure insulation system integrity.Manufacturer shall have in place a system of recording, correcting, and verifying resolution of discrepancies discovered during the inspection and testing process. The manufacturer shall be ISO 9001 certified.Certified production test reports indicating satisfactory completion of all inspection and test procedures shall be available upon request.Upon request the equipment shall be made available for customer inspection prior to shipment.Production tests shall be performed in accordance with ANSI standards C37.20.2 and C37.09.Test reports for design tests shall be available upon request.Switchgear accessories and options available upon request.Standard maintenance and operation tools shall be supplied with the switchgear.Test cabinet for testing electrically operated breakers outside housingManual Ground and Test Device can be supplied.Electrically Operated Ground and Test device can be supplied.Portable motor for remote racking can be suppliedIntegral motor mounted internal to the breaker (OnBoard Racking) racking can be supplied.A remote panel to open and close the breaker can be supplied (Mimic Panel)A female receptacle on the face of the gear can be supplied to allow remote (Open/Close).Live thermal bus monitoring and alarm system can be supplied (BriteSpot).. DocumentationDrawingsPrior to fabrication the following drawings shall be submitted by the manufacturer for approval.Front elevation view.Base plan including mounting details, cable entry area, and door swing requirements.Cross section view of each different section.Three line ponent bill of material indicating quantity, description, and part number.Control or schematic diagram for each different unit.Following the return of approval drawings the manufacturer shall prepare and submit wiring diagrams indicating physical location of secondary control components and the appropriate wiring connections. Each control wire will be labeled. Copies of these drawings shall be submitted to the customer, upon completion, for record.After the return of approval drawings or after any change made to previously approved drawings, the manufacturer shall submit a record copy of any and all drawings that contained revisions.After completion of the inspection and testing procedures the manufacturer shall submit a complete set of "as built" drawings. These drawings shall function as a record of the final construction of the equipment at the time it left the factory.Drawings may be provided in any of the following forms as requested by the customer:Full size plotted reproducible drawings size as required. "D size" measuring approximately 34" x 22", "C size" measuring approximately 22" x 17", "B size" measuring approximately 17" x 11", or "A size" measuring approximately 11" x 8?".Three (3) reduced photocopies of original plotted drawings.Digital files in the latest version of Autodesk AutoCAD.Digital file format may be dwf, pdf, dgn, or dwg as specified.Each drawing prepared by manufacturer shall show, at a minimum, the name, jobsite location, purchase order or contract number, and equipment identification number in addition to any information required by manufacturer.Operating and Maintenance ManualsAt time of shipment the manufacturer shall provide a copy of the operating and maintenance instructions for all major components contained in the switchgear assembly.Manuals shall contain a table of contents to allow for easy reference.Operating and maintenance manual will be provided as pdf files on a CD for easy reference.Spare Parts ListUpon completion of the engineering phase, a quotation for one (1) year's recommended spare parts shall be submitted.For assistance regarding these specifications or with support questions, please contact Powell directly:Powell Electrical Systems, Inc.8550 Mosley RoadHouston, TX 77075713.944.6900Email: info@Website: ................
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