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W (1+2) Z double-bridge span(IⅠI) de-energized tap changer

De-energized drum cylindrical tap changer all excellent

W (1+2) Z double-bridge span(IⅠI) de-energized tap changer

The series applies to the oil-insulated transformer highest voltage grade 220kV or less, the rated through-current 3000A or less, in the transformer’s de-energized state, switch the tap changer to change the effective turns of the transformer coil, to achieve the purpose of changing the transformer ratio, adjusting and stabilizing the output voltage.

    Model Meaning


    For example:W(1+2)ZⅡ630/40.5-6X5 S(Y)C W model is de-energized triple-phase cylindrical middle single bridge span, rated through-current 630 A, highest voltage for equipment 40.5kV, manual (with remote gear display), side operation, 6 tap, 5 gears, horizontal installation.


    1.The appearance design is simple, the installation size is small, and the installation method is flexible;
    2.Strong operation feel, reliable contact, not easy to misoperate.
    3.The contact has automatic refunction.
    4.Miniaturizalize transformer’s design, simplizee tap changer and transformer’s connection, the electric field distribution is uniform, flexible layout

    Advice for user selection and Utilization
    It is separately designed from the operation part and the body part, and the installation methods are flexible and diverse. For the selection, please combine the selection according to the required operating mechanism and the model of the body.
    It is standard with lead and operated insulation rod. With special requirements, please clearly indicate in the contract and order notice. The operating insulation rod should be dried with the switch before installation and use, and can be used after drying. The lead wire is covered with insulating paper, please notice its thickness if there exists special requirements.
    No △ symbol in the basic model refers to the neutral point connection method of the transformer.
    Its current level should be selected with a corresponding margin, and it is recommended to reserve a 20% margin.
    The selection of its voltage level shall meet the power frequency and impact requirements of main insulation and longitudinal insulation. 

    Please specify any special requirements
    Before ordering, please request the Order Specification and electronic drawing (PDF or DWG format).
    When installing the clamp tap changer, it and the transformer gripper should be fixed firmly, otherwise the its body will move down after vibration and lead to the control lever clutch.
    Tap changer and transformer coil tap connection, please connect to its body on the transformer, for the radial outlet switch, is not allowed to force when the wiring tap lead root bending wire, lead bending please adopt the way of static rolling, the root insulation will bend after lead, then please users to bandage.
    After it is dry, do not switch without sufficient lubrication to avoid damaging the switch.Its operating mechanism is separated from its body, and the operating mechanism of it is not dried when drying.
    Its operating mechanism is equipped with mechanical limit. Do not exceed the switch limit gear to avoid damage. Please use the impact force operation when working.
    During its operation or the transmission mechanism during the core inspection or field debugging, please remove the mechanism, mark before disassembly, and test the DC resistance and variable ratio to verify that the installation is correct.

    Model Main Technical Specification

    Main performance parameter insulation level(kV) Seal function machinery life span (Time) Rated through-current (A) Short-circuit capacity
    Highest working voltage(KV) Connection method power frequency (1min) Impact(1.2/50μs) Thermal stability(3s)(kA) Dynamic stability(kA)
    To ground Between phase Between contacts Between the first and last To ground Between phase Between contacts
    12 (Y,△) 45 45 20 100 100 70 0.25MPa 24h 2000 250 5 12.5
    40.5 Y 100 40 30 230 120 90 400 6 15
    100 100 30 230 230 90 630 7.5 18.75
    72.5 Y 160 100 30 230 230 90 800 8 20
    160 160 45 350 350 150 1000 10 25
    126 Y 230 140 45 550 350 150 1250 12.5 31.25
    230 230 55 550 550 175 1600 16 40
    252 460 * 90 1050 285 2000 20 50

    Schematic Diagram


    Outline Drawing

    W (1+2) Z single-bredge span(IⅠI) outline install measurement drawing.
    D" phase(1 phase)clamp-type installation; "L" phase(2phase)clamp-type installation.


    Typical installation measurement Voltage (kV) Current (A) Gear Outline,install measurement(mm) Frequency/Impact(kV)
    L L1 L2 D1 D2 d D3
    W(1+2)Ⅲ250~1000/40.5-4X3~6X5 40.5 250、400、630、800、1000、1250、1600 3、5 275 850 1250 180 197 1.5s + package insulation thickness S is the lead cross-sectional area (mm2) Of d2 + d + δ, δ 40~50, where the larger the δ, the more convenient the bending of the lead Between layers and phases:100/230
    W(1+2) Ⅲ1250~1600/40.5-4X3~6X5 315 1500 Between contacts:45/155
    W(1+2) Ⅲ250~1000/72.5-4X3~6X5 72.5 375 1600 Between layers and phases:140/325
    W(1+2) Ⅲ1250~1600/72.5-4X3~6X5 Between contacts:45/155
    W(1+2) Ⅲ250~1000/126-4X3~6X5 126 Between contacts:160/420
    W(1+2) Ⅲ1250~1600/126-4X3~6X5 415 950 Between contacts:45/155
    W(1+2) Ⅲ250~1000/40.5-8X7 40.5 7 275 850 1250 200 217 Between layers and phases:100/230
    W(1+2) Ⅲ1250~1600/40.5-8X7 315 1500 Between contacts:45/155
    W(1+2) Ⅲ250~1000/72.5-8X7 72.5 375 1600 Between contacts:140/325
    W(1+2) Ⅲ1250~1600/72.5-8X7 Between contacts:45/155
    W(1+2) Ⅲ250~1000/126-8X7 126 Between contacts:160/420
    W(1+2) Ⅲ1250~1600/126-8X7 415 950 220 237 Between contacts:45/155

    Notice:Dimensions of 12kV and 20kV are consistent with 40.5kV size class, and 72.5kV size is consistent with 126kV class size. If there are special requirements, please give special instructions when ordering.

    Outline Diagram of the Operating Mechanism

    1. Manual Operation(SS)


    2. Manual Operation(Remote gear display)  S(Y)S


    3. Manual operation(SC)


    4. Electric side operation(DC)

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