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  • W□G

    W□G

    W□G

    Type WDG is a drum type de-energized tap changer. It is often designed by the combination of one single-phase and one two-phase tap changers. These two tap changers are to be installed in the clearance between the three winding in one transformer, which is a dramatic saving of transformer space and oil.   


    Item

    Specification

    WDG (single phase), WLG (two phases) Type A

    1

    Max. rated through-current (A)

    250

    300

    400

    500

    600

    800

    1000

    1250

    1600

    2000

    2

    Short-circuit

    current test (kA)

    Thermal (3s)

    5

    5.4

    6

    7

    8

    10

    12

    14

    16

    20

    Dynamic (Peak)

    12.5

    13.5

    15

    17.5

    20

    25

    30

    35

    40

    50

    3

    Rated frequency (Hz)

    50 or 60

    4

    Connection

    Liner (IV), single bridging (V), Y-D change-over (VI), double-bridging (VII), series-parallel (VIII), reversing (II)

    5

    Max. Operating Positions

    5 (IV), 7 (V, VII), 2 (VI, VIII), 7 (II)

    6

    Insulation

    to ground

    (kV)

    Highest voltage for

    equipment Um

    12

    40.5

    72.5

    126

    Rated separate source AC

    withstand voltage (kV/50Hz,1min)

    35

    95

    140

    230

    Rated lightning impulse

    withstand voltage (kV,1.2/50μs)

    75

    200

    325

    550

    7

    Mechanical life

    Not less than 20,000 operations for manual driving

    Not less than 100,000 operations for motor driving

    8

    Operation method

    Manual operation on top or at side, motor driving at side


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