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  • Leader in Electrics & Automation

    Electric Equipment

    Tri-MEC

    Ring Main UnitsMedium Voltage Secondary Distribution

    Ring Main Units Up to 24kV, SF6-Insulated

  • Ring Main Units

    TechnologySafety

    Durability and usefulnessSaving Cost

  • CONTENTS: Applications 4Features 5

    Configurations 6

    Modules 8

    Ring switch module (RPL) 8

    Fuse-switch module (RPF) 9

    Circuit breaker module (RVB) 10

    Outer assembly 11

    RPS 11

    RPF 12

    RPL 13

    RVB 14

    RBR 15

    Cable termination 16

    Ring switch / Circuit breaker 16

    Fuse-switch 16

    Pannel connection 18

    Accessories 19

    Installation 24

    Technical data 25

    Quality assurance 26

    Medium Voltage

    Secondary Distribution

    Ring Main Units

    Up to 24kV,

    SF6-Insulated

  • Applications Tri-MEC

    4

    Tri-MEC is designed for use in the followingapplications:Compact secondary substationsSmall industriesWind power plantsHotels, shopping centers, office buildings, business centers etc.Light mining applications, airports, hospitals, tunnels and underground railways

    Note) Application range.

    Ring Main Units

    Transmission Distribution(24kV)Generation

    Transmission line

    Commercial &Industrialcustomers

    Power plant

    Substation

  • 5

    TechnologyMetal enclosed unit for indoor installation and type tested.Insulated by SF6 GasIndependent of climate.ON-OFF-EARTH, three position load break switch.

    SafetyApproachable and operable safely in the presence of power in the cables.Clear indication of operation status via mimic diagram on front panel.Fully automatic interlocking system.Voltage detector to check the presence of voltage in the cable.

    Durability and usefulnessMetal enclosed tank is hermetically sealed, it means this is independent of

    environmental effects such as dirt, small insects, and moisture and so on.Load break switch operating is possible in the front of Ring Main Units.All switching operations can be made safely to personnel because of interlocking

    system that operates automatically according to the switch position by the operator.Remote operation available in case of using motor mechanism.Fuse LBS will be tripped by a fuse striker pin connected to the mechanism

    in the event of fault happening.Individual panels and panel blocks can be freely combined and extended.

    Saving costOnly a little maintenance is required except replacement of HRC Power fuse after installation.Compact design that requires minimum space to install and operate locally is

    main advantage especially where the space is limited.Materials can be recycled after the end of its service life.

    Features

  • Configurations

    6

    GeneralTri-MEC RMU is an extensible and non-extensible ring main unit for the secondary distributionnetwork. Tri-MEC RMU can be supplied in various different configurations suitable for mostswitching applications in 24 kV distribution networks.When combined with the Tri-MEC RMU, they represent a complete solution for 24kVsecondary distribution networks. Tri-MEC RMU is a completely sealed system with a stainlesssteel tank, gas tight metal enclosure, containing all the live parts, Switching-disconnector, earthswitch, Fuse switch, the circuit breaker. A sealed steel tank filled with SF6 gas ensures a high level of reliability as well as safety and amaintenance-free system. The Tri-MEC RMU offers the user a choice of either a switch-disconnector combined with fuse or circuit breaker with relay for protection of the transformer.Tri-MEC RMU can be controlled completely with an feeder remote unit. Most of this switchgearexists in version that are extensible on the right or on both sides, in order to provide for futuredevelopment.

    Information of model name

    R

    Ring Main Units

    RMU

    P: PufferV :V.IB: Bus

    D: Double feederU: Upside down

    L: LBSF: FuseB: Breaker

    R: RisingS: Standard

    Non-Extensible typeRPS

    LBS

    VD

    LBS

    VD

    LBS

    Fuse

    1535

    1502706

    RPF(1R1F)

    S

    VD

    SA

    LBS

    Fuse

    1537

    695

    706

    880

    1061

    Weight: 400kg

    Weight: 275kgNote) *: Option

    *

    *

  • 7

    Extensible type

    Configurations

    Weight: 210kg

    RPL

    LBS

    VD

    1750

    456730

    Weight: 275kg

    RPF

    LBSS

    Fuse

    1750

    683

    730

    765

    611

    Weight: 260kg

    RVB

    VCB

    2CT

    Trip

    OC 1750

    730520

    Weight: 160kg

    RBR

    VD

    1750

    683

    730456

    765

    *

    *

    Note) *: Option

  • Modules

    8

    Ring switch module (RPL)

    FeatureThree position load break switch and earthing switch.Indicator of switch position for load break switch and earthing switch.Voltage indicator lamp on panel makes it possible to check the presence of voltage in the cables.Pressure gage indicates status of SF6 gas tank and make it check leakage of gas.Intelligent interlock system

    : To switch to Earth position, it should pass "OFF" position from "ON" positionApplied high-speed rotary puffer type for extinction of arc.Dead front structure: It prevents an accident of touching because the live part is not exposed.Electrical (Remote/Local)operation :

    operated by controller which can communicate with FRU (Feeder Remote Unit)Busbars, 630A

    Ring Main Units

    < ON position >

    LBS

    VD

    EAREARTHINGTHINGSWITCHSWITCH

    OpenOpen OpenOpen

    CloseCloseEarEarthth

    LOLOAD BREAKAD BREAKSWITCHSWITCH

    < OFF position >

    EAREARTHINGTHINGSWITCHSWITCH

    OpenOpen OpenOpen

    CloseCloseEarEarthth

    LOLOAD BREAKAD BREAKSWITCHSWITCH

    < EARTH position >

    EAREARTHINGTHINGSWITCHSWITCH

    OpenOpen OpenOpen

    CloseCloseEarEarthth

    LOLOAD BREAKAD BREAKSWITCHSWITCH

  • FeatureFuse rating: 24kV, Max 63A HRC power fuseIndicator of switch position for load break switch and earthing switchThe Fuses conforming to DIN 43625 are used.Automatically tripped to protect from fault current when a fuse is blownApplied high-speed rotary puffer type for extinction of arc.Dead front structure: It prevents an accident of touching because the live part is not exposed.Busbars 200AOption: CTD (Condensor Trip Device)

    9

    Fuse-switch module (RPF)

    LBSS

    Fuse

    A

    B

    C

    < ON position >

    A

    B

    FUSE SWTICHFUSE SWTICH

    EAREARTHING SWITCHTHING SWITCH

    OpenOpenCloseClose

    OpenOpen EarEarthth

    < OFF position >

    FUSE SWTICHFUSE SWTICH

    EAREARTHING SWITCHTHING SWITCH

    OpenOpenCloseClose

    OpenOpen EarEarthth

    < EARTH position >

    B C

    FUSE SWTICHFUSE SWTICH

    EAREARTHING SWITCHTHING SWITCH

    OpenOpenCloseClose

    OpenOpen EarEarthth

    *

    Note) *: Option

  • Modules

    10

    Circuit breaker module (RVB)

    Mechanism operation time

    Ring Main Units

    Feature200A vacuum circuit breakerRated breaking time: 3cycleLatched mechanism - close and open coilProtection as specified by customersMotor charge type and Manual charge typeOption:CTD(Capacitor Trip Device), OCR

    < ON position >

    VCB

    2CT

    Trip

    OC

    < OFF position >< Spring charge

    indicator >

    *

    Note) *: Option

  • 11

    RPS (2LBS + 1Fuse-switch)

    Outer assembly(Non-Extensible)

    LBS operation part

    Chamber

    Control connector

    Fixing bolt for cover

    630A bushing

    Elbow connector

    Cable clamp

    Nameplate

    Gas pressure gauge

    Voltage detector

    Fuse holder Body

    Fuse holder cap

    Fuse strike link

    200A bushing

    Straight connector

    Earth lug

    Earth busbar

    Lift lug

    LBS

    VD

    LBS

    VD

    LBS

    Fuse

  • Outer assembly(Extensible)

    12

    RPF (Fuse-switch)

    Ring Main Units

    630A bushing for connector

    Chamber

    Fuse holder body

    200A bushing

    Operating mechanism

    Straight connector(Option)

    Upper side cover

    Earth connection hole

    Gas pressure gauge

    Control connector

    Cable clamp

    Fuse holder cap

    Fuse strike link

    CTD(option)

    Pressure switch(option)

    Nameplate

    Fixing bolt for cover

    Earthing busbar

    Lift lug

    LBSS

    Fuse

  • 13

    RPL (Ring switch)

    630A bushing for connector

    600A bushing

    Chamber

    Elbow connection (option)

    Cable clamp

    Earth connection Hole

    Upper side cover

    Operation mechanism

    Nameplate

    Voltage detector

    Gas pressure gauge

    Fixing bolt for cover

    Earthing busbar

    Lift lug

    LBS

    VD

  • Outer assembly(Extensible)

    14

    RVB (Circuit breaker)

    Ring Main Units

    630A bushing for connector

    630A bushing

    Chamber

    Elbow connection (Option)

    Cable clamp

    Gas pressure switch (Option)

    Upper side cover

    Operation mechanism

    Gas filling valve

    Nameplate

    Voltage detector

    Gas pressure gauge

    CTVCB

    2CT

    Trip

    OC

    *

    Note) *: Option

  • 15

    RBR (Bus rising)

    630A bushing for connector

    630A bushing

    Chamber

    Elbow connection (Option)

    Earthing busbar

    Upper side cover

    Gas pressure gauge

    Nameplate

    Voltage detector

    Cable clamp

    Fixing bolt for cover