mv metalclad switchgear

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  • 1SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    MV MetalClad Switchgear

    Still The BestMV Solution

    Gary H. Fox, PEGE EnergySenior Specification Engineer

    T 925 969 3608C 510 219 6868E gary.fox@ge.comwww.geindustrial.com/design

    2120 Diamond Blvd., Suite 100Concord, CA 94520General Electric Company

    San Francisco IEEE / IAS Electrical Design and Applications Seminar

    April 29,2011

  • 2SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    SAFETY FEATURESDEAD FRONT CONSTRUCTION CLOSED DOOR RACKINGREMOTE BREAKER RACKING & CONTROL AVAILABLEPT & CPT ROLLOUT TRAYSBREAKERS CANNOT RACK IN/OUT IF CLOSEDCANNOT CLOSE BREAKERS IF NOT FULLY RACKED INSPRINGS DISCHARGE WHEN BREAKER IS MOVEDMECHANICALLY INTERLOCKED SHUTTERSGROUND & TEST DEVICES AVAILABLESAFE AUXILIARY SECONDARY FUSES ACCESSIBILITYEXTERNAL BREAKER POSITION INDICATORFULLY ISOLATED 2-HIGH CABLE COMPARTMENTS

  • 3SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    MetalClad Switchgear & Breakers:ANSI C37.04 - AC Power Circuit Breaker rating Structure

    ANSI C37.06 - 1987 & 2000* - Preferred Ratings of Power Circuit Breakers

    ANSI C37.09 - Test Procedures for Power Circuit breakers

    ANSI C37.54 Conformance Test Procedures

    ANSI C37.010 Application Guide for Power Circuit Breakers

    ANSI C37.11 Power Circuit Breaker Control Requirements

    ANSI C37.20.2 Standards for Switchgear Assemblies

    NEMA SG-4 & 5 - Power Circuit Breakers & Switchgear Assemblies

    Optional: UL & CSA Listing

    *Why is there two years??

    Codes & Standards

  • 4SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    ANSI C37.06-1987

  • 5SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    ANSI C37.06-2000

  • 6SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Voltage - 1.0 kV thru 15 kV Maximum

    Nominal Voltage Classes

    4160V, 7200V, 13800V

    Short Circuit Current Ratings:

    Nominal MVA Classes

    4160-250MVA - 29KA (sym)

    4160-350MVA - 41KA

    4160-450MVA - 63KA*

    7200-500MVA - 33KA

    7200-785MVA - 63KA *

    13800-500MVA - 18KA

    13800-750MVA - 28KA

    13800-1000MVA - 37KA

    13800-1500MVA - 63KA*

    Equipment & Breaker Ratings

    Maximum KA Ratings (ANSI 2000)

    4760-31.5KA (sym) 4760-40KA 4760-50KA 4760-63KA* 8250-40KA 8250-50KA* 8250-63KA* 15000-20KA 15000-25KA 15000-31.5KA 15000-40KA 15000-50KA 15000-63KA

    * Exceed ANSI Preferred Ratings

  • 7SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Vacuum interrupters first conceived in the 1920s, manufacturing of Vacuum Breakers began in 1961Vacuum breakers allowed 2-high drawout designs beginning in 1976

    5 Cycle (std) & 3 Cycle (optional)Interrupting Speed Capability

    Reduced & Easier Maintenance Than Other Interrupting Designs, Such as SF6 & Air Magnetic

    Vacuum Interrupter

  • 8SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    VACUUM BREAKER CONSTRUCTION

    CONTINUOUS CURRENT - 1200A thru 4000A (forced air)Modular Phase Interrupters - Simple ReplacementCopper Ground BarManual Trip/Close ButtonOperations CounterSpring Charge IndicatorRating Interference PlateWheels On Frame For MobilityContact Wear Indicator

    Mechanism

    Interrupter Assemblies

    PrimaryDisconnects

    FrontCover

    SecondaryDisconnect

  • 9SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage SwitchgearAll MetalClad meets Metal Enclosed, but Metal Enclosed gear does not meet MetalClad Requirements!

    Metal Enclosed Switchgear (C37.20.3)Completely enclosedPrimary power circuit switching or interrupting devicesBusesConnectionsControl and auxiliary devices. Access provided by doors or removable covers, or both.

    Metalclad Switchgear (C37.20.2)Main switching and interrupting device must be drawout. Circuit breaker (usual) or a load-break interrupter switch (unusual). Extensive barrieringShuttersAll live parts enclosed within grounded metal barriersInsulation-covered busAll compartments separated by metal barriers with no intentional openings.

  • 10SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    And theres more to C37.20.2!

    Metal barrier in front of or part of switching device to ensure that no live parts are exposed when the outer cover is opened while in the connected position.Mechanical interlocks provided for proper operating sequence

    > Prevent movement while closed> Prevent closing unless disconnects are fully engaged or at safe distance> Prevent disconnection and access to primary fuses on CPT unless secondary open> Stored energy mechanisms cannot be discharged unless fully charged> Complete withdrawal not permitted until closing mechanism is blocked> Automatic discharge of stored energy mechanism before or in process of removal

    from housing> Provisions for locking to prevent moving into Connected position

  • 11SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage SwitchgearSTANDARD Construction & Dimensions

    Typical Indoor

    Dimensions:

    95 H

    36 W

    94 D

    36 Width

    Sections for Indoor

    and Outdoor

    CTs GSCT

    Cable

    Trough

    Surge

    Suppressors

    Main Bus

    Breakers

    Front

    Of

    Gear

    Standard 2-High Sideview

  • 12SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage SwitchgearSWITCHGEAR CONSTRUCTION BASICS Separate Breaker, Bus, & Cable

    Compartments, isolated with 11 gauge steel barriers.

    Bolted Steel Frame Construction, with gusseted corners very rigid, stable

    NEMA 1 & 3R Construction Outdoor with or without aisle Closed Door Breaker Drawout 11 Gauge Steel Doors, (2) 14 Gauge

    Panels Between Sections All steel is either Zinc plated, or

    painted. No bare metal.

    Main Bus CompartmentCable Compartments

    Breaker Compartments

  • 13SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    SWITCHGEAR BUS BASICS

    1200, 2000, 3000, 3500 & 4000* AMPS. (* 4000A breaker section is fan cooled)

    80KA Asym. Bracing, 130KA Peak, Std.6 Copper Bus Bars Full Tin Plate Standard, Silver Available.

    Note Silver is used on all sliding contact surfaces.

    All Phase Bus Fluidized Bed Epoxy Coated1/4 X 2 Ground Bus StandardPolyester-Glass Supports Standard,

    Porcelain OptionalVinyl Boots With Nylon Hardware On JointsFully Isolated with 11-Gauge Steel

    Riser Bus Main Horizontal Bus

    Bus Boot

  • 14SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage SwitchgearBREAKER/AUXILIARY COMPARTMENTSPolyester-Glass Primary Supports (std)Polyester-Glass or Steel Shutters,

    Mechanically Interlocked With Racking Mechanism in Breaker CompartmentsMax of 4 CTs Per Phase, Per Breaker On

    Primary SupportsPT/CPT, 4 Trays Per Section PT/CPT Primary Fuses are Inaccessible unless

    Tray Is DisconnectedOpen / Close / Test Position IndicatorSecondary Disconnect Block

  • 15SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    CABLE COMPARTMENT CONSTRUCTION

    Provision For Cable, Bus Duct, Potheads or REBsNEMA Drilling For 2-750 MCM Per Phase With Space For Stress ConesSteel Isolation Trough For 2-High Breaker CablesFront to Rear Control Wire TroughMounting For Ground Sensor CT (GSCT) Arrestors, CPTS/CTS Surge Suppressors For Switching Transient Suppression on Feeders

  • 16SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Enclosures

    IndoorIndoor Drip-proofOutdoor, No AisleOutdoor Protected AisleOutdoor Common AisleIndoor provided in Equipment Power CenterSite Specific Seismic Withstand Levels: Ss, Sds

  • 17SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Covers

    Bolted rear covers with lifting handlesHinged rear coversProvisions for locks, rear and/or frontIR Scanning Ports on rear covers

  • 18SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Did YOU Notice that ALL MV breakers are electrically operated ???????Ac (120 V, 240 V) vs dc (48 V, 125 V)Trip and close circuits can be differentPG&E requirementsMicroprocessor based relays require control power

    (ac not a good choice)Supplied from ??? CPTs Line or bus connectedThrowover contactors on multiple mainsIntegral branch panels not necessary

  • 19SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Control Wire/ Terminations Options

    Uninsulated spade, CT wiring with ring typeInsulated terminalsRing type for allOrigin/destination sleevesShort circuit type terminal blocks on CT

    secondary

  • 20SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Circuit Breaker

    5 cycle std3 cycleCapacitor Switching dutyAuxiliary Contacts (MOC)Position Switch (TOC)Control voltage

  • 21SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Copper Main Bus

    Polyester bus supportsPorcelain supportsTin plated jointsSilver plated joints

  • 22SF IAS Electrical Design Seminar

    April , 2011

    Medium Voltage Switchgear

    Auxiliary Devices

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