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  • CM2

    CM2

    CM2

    Type CM2 on-load tap changer perfectly integrates the proven reliability of type CM and vacuum switching technology. Completely same dimension not only saves the transformer designers from re-designing the transformer for vacuum technology, but also provides a direct retrofit diverter switch for existing tap changer upgrade from conventional to vacuum tap changer. 



    Item

    Specification

    CM2III 500Y

    CM2 I 500

    CM2III 600Y

    CM2 I 600

    CM2 I 800

    CM2 I 1200

    CM2 I 1500

    1

    Max. rated through-current (A)

    500

    600

    800

    1200

    1500

    2

    Rated frequency (Hz)

    50 or 60

    3

    Connection

    3 phases for neutral point of star connection

    1 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

    With change-over selector

    35

    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

    Internal Insulation Level

    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 600,000 operations

    12

    Oil compartment 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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