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  • CMD

    CMD

    CMD

    Type CMD is designed with state-of-the-art technology and concept. Its unique contact system ensures superior performance for carrying heavy load and enduring short circuit current. In large power and ultra high voltage transformers, Type CMD is the natural choice to achieve high reliability.

    Item

    Specification

    CMDIII

    CMDI

    1

    Max. rated through-current (A)

    400

    600

    1000

    400

    600

    1000

    1600

    2400

    2

    Rated frequency (Hz)

    50 or 60

    3

    Connection

    3-phases Y connection for neutral point only

    Single-phase for any selectable winding connection

    4

    Max. rated step voltage (V)

    3300

    4000

    3300

    4000

    5

    Rated step capacity (kVA)

    1500

    1600

    3000

    1500

    1600

    3000

    4400

    5600

    6

    Short-circuit

    current test (kA)

    Thermal (3s)

    6

    8

    12

    6

    8

    12

    24

    24

    Dynamic (Peak)

    15

    20

    30

    15

    20

    30

    60

    60

    7

    Max. Operating Positions

    14 without change-over selector; 27 with change-over selector

    8

    Insulation

    to ground

    (kV)

    Highest voltage for

    equipment Um

    72.5

    126

    170

    252

    Rated separate source AC

    withstand voltage (kV/50Hz,1min)

    140

        230

             325

        460

    Rated lightning impulse

    withstand voltage (kV,1.2/50μs)

    350

        550

                750

           1050

    9

    Tap selector

    4 grades of B, C, D and DE according to insulation level

    10

    Mechanical life

    Not less than 1,500,000 operations

    11

    Contact life

    Not less than 200,000 operations

    12

    Oil compartm-ent of diverter switch

    Service pressure

    0.03Mpa

    Leakage test

    No leakage under 0.08Mpa for 24 hours

    Over pressure protection

    Bursting cap busts at 300 ± 20%kPa

    Protection relay

    Oil flow speed set at 1.0m/s ±10%

    13

    Motor drive unit

    SHM-D or CMA7

    14

    Oil filter plant

    ZXJY-1 / ZXJY-2 / ZXJY-3 according to requirement (Necessary when max. rated through current is 1000A and above or OLTC used for industrial applications)


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