abb mv switchgear overview 2009 (nxpowerlite).ppt

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  • February 2008

    MV Metal-Clad SwitchgearThe safest, most reliable Switchgear in the market today

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  • Arc-Resistant StandardsIntroduction Todays TopicsWhat is Arc Flash and the risks it representsArc-Resistant Switchgear StandardsABB Switchgear OfferingCharacteristics of SafeGear Arc-Resistant SwitchgearOther Safety Features available in Switchgear today

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  • What is an Arc Flash? The result of a rapid release of energy due to an arcing fault between phases, neutral or a ground. An arc arises when at least part of the current passes through a dielectric, usually air Maximum peak power up to 40 MW Arc temperature up to five times the surface temperature of the sun (20,000C) Light intensity more than 2000 times that of normal office light Volumetric expansion approximately 40,000+ - 1

    Temperature of the sun surface is about 5000C.

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  • Arcing Incidents Do HappenFault characteristicsAn arc arises when at least part of the current passes through a dielectric, usually airMaximum peak power up to 40 MWArc temperature up to five times the surface temperature of the sun (20 000C)Light intensity more than 2000 times that of normal office light

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  • Arc Flash Danger StatisticsCurrently, OSHA lumps Arc Flash incidents in with electrical incidents.A recent survey showed that 5-10 people per day go to burn centers due to arc flash incidents that does not include those going to local and regional hospitalsThat is 2000-3500 people a year in the US!With the high mortality rate of burn injuries, this can translate to hundreds of deaths a yearIEEE did a study with a large utility and over the last 53 years, they have had 1 arc flash incident every 18 months.

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  • Arcing Incidents Do HappenSecurity Video of Arc flash incidentDistributed by NFPA

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  • Arc-Resistant SwitchgearCauses of internal arc faultsImproper maintenance, mechanical, and interlock failuresFailure to follow proceduresGradual component or insulation breakdownForeign objects, rodents, snakes, etc.Effects of an internal arc faultPressure increase in an enclosed compartmentFunction of arc voltage, current, number, and duration of arcs, volumeRapid onset (10-15 ms) results in explosive forcesThermal effects, hot gasesCatastrophic to nearby personnel and equipment

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  • Evolution of Arc-Resistant StandardsInterest in Europe uninsulated bus was commonAnnex AA to IEC 298 was approved in 1981EEMAC G14-1 was published in 1987 in CanadaType A arc-resistant construction at the front onlyType B arc-resistant construction at the front, back, and sidesType C arc-resistant construction at the front, back, and sides, and between compartmentsIEEE C37.20.7-2007 includesType 1 similar to EEMAC Type A aboveType 2 similar to EEMAC Type B aboveAnnex A addresses suffixes B and CType 1C Type 1, but also with arc-resistance designs or features between adjacent compartmentsType 2B Type 2 with LV instrument compartment door open relay and maintenance personnel surviveType 2C Type 2 with arc-resistance features between adjacent compartments switchgear survives with minimum damageType 2BC The ultimate in protection combines types 2B and 2C

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  • Industry Recognized Arc-Resistant StandardsOSHA 29 Code of Federal Regulations (CFR) Part 1910, Subpart SNFPA 70E-2004, Standard for Electrical Safety in the WorkplaceIEEE 1584-2002, Guide for Arc Flash Hazard AnalysisIEEE C37.20.7-2007, IEEE Guide for Testing Medium-Voltage Metal-Enclosed Switchgear for Internal Arcing Faults

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  • Arc-Resistant StandardsCurrent Requirements and How They ApplyOSHA 29 Code of Federal Regulations (CFR) Part 1910, Subpart SSafe practices to prevent electrical shock or burns must be implementedMandates that exposed workers must be qualifiedRequires provisions for the appropriate personnel protective equipment (PPE)NFPA 70E-2004, Standard for Electrical Safety in the WorkplaceDetails steps to comply with the OSHA requirementsWorker trainingAppropriate, safe toolsSafety programArc flash hazard calculationsPPEEquipment warning labels

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  • THE NEW NFPA 70E 2009, TABLE 130.7 (C) (9) Arc-Resistant SWITCHGEAR TYPE 1 OR 2Hazard/Risk Category for Arc-Resistant Switchgear

    Applies to clearing times of

  • Arc Flash Introduction - Mitigation TechniquesRedirecting energy away from workersReducing the arcing current (En ~Ia)Not effective method as test data is required for current limiting devices (fuses)Increasing the working distance (E~1/D)Using remore racking device, remote operating devices incident energy might be reducedReducing the clearing time (E~t)Zone selective interlocking slow (100ms) + breaker operate time)can not be used for retrofit installationsBus bar protectionexpensive to install due to number of CTsLight Detection

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  • ANSI C37.20.7 Accessibility Types1Front only1CFront plus between compartments within a section or between adjacent vertical sections (except main bus compartment)2Front, back, and sides2BIsolation of the Low Voltage Compartment with the instrument door open2CFront, back, and sides, plus between compartments within a section or between adjacent vertical sections (except main bus compartment)2BCOffers compartment to compartment and low voltage isolation. Offers the very best solution for personnel protection and system reliability.

    SafeGear meets IEEE C37.20.7-2007 Type 2, 2B, 2C and 2BC!

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  • Arc FaultsSafeGearConventional Switchgear

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  • Pressure Buildupenclosure rupturePressure measurementsvent flap opensSuccessful SafeGear testSafeGearconventional

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  • Introduction to ABB ANSI Switchgear5 to 15 kV metal clad switchgearAdvanceTraditional non-arc-resistant switchgearSafeGearMeets ANSI Standard C37.20.7-2007 for arc-resistanceFour versions Types 2, 2B, 2C and 2BC availableVacuum circuit breakersAMVACMagnetically actuated mechanismADVACSpring operated mechanism

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  • Ratings4000 A rating available for Advance only.

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  • ABB Metal-Clad SwitchgearFeaturesGalvanic constructionHem bendingModular designBolted frameInstrument compartmentBreaker compartmentBus and cable compartmentPotential transformer compartmentArc-resistant switchgearSafeGearPower distribution centerPlenumCircuit breaker technologyADVACAMVAC magnetically actuated circuit breaker option

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  • Galvanic ConstructionResistant to rust, corrosion and scratchesNo paint requiredHighly reflective(Side view with covers removed)

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  • Hem BendingNo sharp edges for increased safetyImproved rigidityReduces arc propagationForms a self-supporting structure

    Hem bending creates a rigid structure and sturdyconstruction in metal-clad switchgear (reinforced,arc-resistant door construction shown).

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  • Modular DesignBolted construction enables faster replacement and modification in the fieldAllows for easy replacements, repairs, and specialized configurationsMaintains the smallest, compact product

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  • Instrument CompartmentTotal isolation from medium voltage components No instruments on breaker doorGalvanic interiors provide superior reflectivity inside compartmentsAvailable in four sizes19, 38, 57, 95Gasketed doorEasy accessibility for operatorsTruck operated cell switches located in the low voltage compartment for easy access and to minimize exposure

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  • Breaker CompartmentDual safety shutter actuators Interlock prevents manual operation Mechanically forced by breaker movementShutters grounded by cableClear Lexan shutters availablePosition indicatorConnectedTestDisconnected

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  • Breaker CompartmentAutomatic secondary disconnectProvides improved safety for workers while operating the breakers when using SafeGearSingle or double plug secondary contactsGrounding contactInterference blockPrevents installing undersized breakers

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  • Bus & Cable CompartmentsCopper busEpoxy coated bus insulation systemNo sleeve insulationSilver plating standardTin plating availablePorcelain or glass polyester standoff insulatorsMolded vinyl boots with re-useable hardwareCatalog number embossed on each boot to make reordering easyNo tape used

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  • PT CompartmentsOne to three potential transformers (PTs)In SafeGear, less than 40kA duty is 19 inches high. 40kA and 50kA duty is 38 inches high Closed door racking in and out adds element of safetyDrawout construction with extension rails makes the compartment easily accessibleLift truck not required to replace fusesDelrin snuffer contact technology

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  • CPT Compartments15 kVA, single-phase, truck mountedLarger size CPTs are fixed mounted in the rear compartmentFuse truck with fixed mounted CPTClosed door racking adds element of safetyDrawout construction with extension rails makes the compartment easily accessible for fuse replacement. Compartment is 38 inches highLift truck not required to replace fusesDelrin snuffer contact technology

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  • Arrangements

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  • SafeGear Arc-Resistant SwitchgearEnhanced safety for personnel and equipmentFlap/vent system to relieve pressurePatented collection chamberGases are safely expelled out the roof through the plenumBuilt to EEMAC G14-1 1987 type B and C construction and IEEE C37.20.7-2007 Types 2, 2B, 2C and 2BCMore than 25 years experience in arc- resistant switchgearDesign allows for flexibility in configurations and promotes superior safety performanceCertified by an independent test lab

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  • SafeGear Demonstration

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  • Location of Flaps and Vents in SafeGear

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  • SafeGear Patented Internal Collection Chamber

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  • SafeGear ConstructionBreaker doors secured with heavy duty hinges and boltsMulti-point handle and latching available Double thickness of steel Gasketed constructionSeals gases insideLexan arc-resistant window largest in industry allows the operator to check position and status of circuit breaker without opening the cell door

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  • Plenum BenefitsChannels gases out of PDCProvides room for flap operationAllows gases to expandProtects cable traysMaintains weather protectionAllows lower building height

    PlenumPDC ceilingPDC AisleTwo-high SafeGear

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  • Plenum DesignSealed duct across top of switchgear, covering all vent flapsSized and shaped to minimize turbulence and back-pressureAllows room for cable trays and conduit entryChannels gases safely out of building, through wall penetration and vent

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  • Plenum End FlapFlaps normally closedOpens with pressure in case of arc fault

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  • Circuit BreakerClosed door racking to all positions adds element of safetyThree position breakerPositive stop in all positionsBreaker positively latched in the compartment (Disconnect)Racking mechanism is integral to the breaker elementAuxiliary switches are breaker-mounted and wired out through the secondary disconnect, eliminating the need for separately mounted mechanism operated cell switchesFront access mechanismCentered racking mechanism for easy alignmentEmbedded pole design

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  • ADVAC Circuit BreakerManual open andclose push buttonsNon-re-settableoperations counterOpen/close indicatorRacking access portManual springcharge portSpring chargestatus indicatorCell locking tabsand handlesRacking release leverRacking padlock provision forlockout and safety procedures

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  • ADVAC Circuit BreakerPrecision camOn-board auxiliary contactseliminate the need for cell-mounted MOC switches and related mechanical linkages 4a, 4b standard 9a, 8b optional

    Auxiliary switchoperating shaft

    Main drive shaft

    Charging motor

    Toroidalspring

    Close &trip coils

    Simple, front-accessible operating mechanism and control components

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  • AMVAC Circuit BreakerOperating mechanism rated for 100,000 operations10 times ANSI requirementInterrupter assemblies rated for 30,000 full load operationsVirtually maintenance free (minor lubrication needed)Only seven moving parts90% less partsPermanent magnet for holding force and latchDual capacitors store energyFull operation for up to 90 seconds after loss of control powerInterchangeable with ADVAC

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  • AMVAC Circuit Breaker1.Upper Primary Terminal2.Vacuum Interrupter3.Epoxy Potting Compound4.Lower Primary Terminal5.Flexible Connector6.Wipe Springs7.Insulated Pushrod8.Jackshaft9.Stroke Adjustment10.Position Sensors11.Close Coil12.Permanent Magnets13.Armature14.Open Coil15.Manual Opening Actuator16.Mechanism Enclosure

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  • AMVAC Circuit BreakerManual opening mechanismAuxiliary contactsSensor for switching position detectionMagnetic actuatorElectronic controllerElectrical energy storage

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  • AMVAC vs. ADVACAMVACs simple design reduces moving elements and the need for spare parts

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  • AccessoriesRacking crank, manual close barTest cabinetTest jumperGround & test deviceElectric racking deviceLift truckRampShutter actuator truckBreaker release handleWear test deviceDummy circuit breakersSlow close deviceIR Viewing Ports

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  • Arc Flash Mitigation RelaysREA 101 Arc Protection RelayFast trip time (< 2.5 ms)Unique fiber optic sensor technology with self supervisionCurrent supervision for secure and reliable arc detectionEasy to configure via front mounted dip switchesSuitable for existing LV / MV switchgear installations or new applicationsMinimize potential risk of injury or death while increasing reliability Includes standard 12 year warranty

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  • Arc in the right bus compartment with the tie breaker openRight REA 101 detects overcurrent Right REA 101 detects lightREA 101s send the current information to all connected unitsRight bus is disconnectedREA Application Example #1

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  • IR viewing PortsSAFE: Successfully Arc-Flash tested in accordance with IEEE C37.20.7RUDGGED: Certified by UL, SIRA and Lloyds of London for installation into both indoor and outdoor equipmentFLEXIBLE: Broadband optic suitable for all IR cameras.SECURE: Unique mounting system allows for safe, single person installation & retro-fitting with No dangerous internal fasteners required. Eliminate need to enter the switchgear while energized. Frequent monitoring possible without impacting production. Easy to use system requires little training

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  • Product description Applicable to any unshielded medium voltage system from 3 kV to 36 kVFor permanent installation information on voltage presence available all the time Outdoor and indoor applicationGood visibility under all lighting conditionsMaintenance free; passive device no power supply neededSimple and robust construction resistant to overvoltages (does not use electronic elements)Very compact constructionEasy to installEconomical solutionIndicator of voltage presence installed directly on bus bars, conductors etc.Advantages of VisiVolt

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  • In SummaryAdvance & SafeGear available at 5 and 15kVSafeGear arc-resistant switchgear Types 2, 2B, 2C and 2BC provide the highest level of personnel protectionAMVAC breaker100,000 mechanical operations mechanism30,000 load break operations interrupterVirtually maintenance freeREA RelaysProtects you personnel and equipment with the most advanced arc flash mitigation relays on the market.

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  • ABB

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    how many have seen or know of switchgear incident in your organization

    how many know of use of arc-res switchgear in your organization