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  • CM

    CM

    CM

    Type CM is a classic on-load tap changer composed by diverter switch & tap selector. It covers the widest application range from small power up to large power transformers. After a long history of operation and modifications, today type CM is one of the most reliable tap changers, which is able to withstand heavy duty with over 1,000 daily operations in furnace application.

    Item

    Specification

    CMⅢ 500Y

    CMⅠ500

    CMⅢ 600Y

    CMⅠ600

    CMⅠ800

    CMⅠ1200

    CMⅠ1500

    1

    Max. rated through-current (A)

    500

    600

    800

    1200

    1500

    2

    Rated frequency (Hz)

    50 or 60

    3

    Connection

    Three-phases for neutral point of star connection

    Single-phase for any selectable winding connection

    4

    Max. rated step voltage (V)

    3300

    5

    Rated step capacity (kVA)

    1400

    1500

    2000

    3100

    3500

    6

    Short-circuit

    current test (kA)

    Thermal (3s)

    8

    8

    16

    24

    24

    Dynamic (Peak)

    20

    20

    40

    60

    60

    7

    Max. Operating

    Positions

    Without change-over selector

    18 (special linear regulation can be up to 34)

    With change-over selector

    35 (special multiple coarse regulation can be up to 107)

    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 800,000 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


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