最近搜索

    Current Transformers

    Current transformers (CT's), also known as Core Balance Current Transformers or Current Transducers, are instruments that are used to reduce or multiply the current from a high current into a lower current or vice versa. Current transformers, however, work in a slightly different way from voltage transformers. Plus, the amount of reduction in current is dependent upon the turn ratio. Whereas, connecting an ammeter to the CT's terminals will allow you to measure the current easily.

    Current Transformers (CT) consist of a core, a primary and a secondary winding. In some current transformers, the primary winding has a limited number of turns, making it possible for current to be measured without disconnecting it from the supply or load. Since it is arranged in this manner, the current transformer is sometimes called a "series transformer" .

    It is possible, however, that the secondary winding contains many coil turns which are wound atop a laminated core made out of magnetic material that is low-loss. With this core, the cross-sectional area is large, resulting in a low magnetic flux density when coupled with a wire of a smaller cross-section, no matter if it has to step down the current, whatever the load.

    The secondary winding supplies current either to a short circuit, such as an ammeter or a resistive load, up to the point when the secondary becomes saturated or breaks down due to excessive voltage.

    RS offers an extensive range of highly accurate Core Balance Current Transformers in various transformer types, current ratings, CT ratio supply voltages and mounting types to suit every application. Supplied by industry-leading brands including Siemens, Murata Power Solutions LEM and of course RS PRO.

    How does a current transformer work?

    When an alternating current flows through the primary winding, a magnetic flux is created which then induces an alternating current in the secondary winding. This alternating current is proportional to the current in its primary. Current transformers are also known as "step-down transformers". Once the current has been reduced it can be safely monitored and measured using an Ammeters

    Types of current transformer (CT meter)

    #1 - Toroidal Current Transformer

    In the shape of a doughnut, these transformers are designed without having a primary winding as part of their construction. Rather, a toroidal transformer has a window or hole through which the current flowing in the network passes.

    #2 - Wound Current Transformer

    Transformers have primary windings that are connected physically line to line with the conductor bringing the measured current through the circuit.

    #3 - Bar-type Current Transformer

    This type of transformer uses the cable, or busbar, of the main circuit as its primary winding, effectively one turn of the transformer. In most cases, they are bolted directly to current-carrying devices and are fully insulated from high operating voltages.

    Where would I use a Current Transducer?

    CTs are used in a wide range of industrial and commercial measurement applications. Some of the most common are:

    1. Generating Stations
    2. Electrical Substations
    3. Commercial Electric
    4. Power Distribution
    5. Electrical Panels

    Usually, ammeters and current transformers are used in conjunction, with the current transformer being designed to deliver a maximum secondary current equivalent to the ammeter deflection at full scale. It is common for current transformers to have inverse turn ratios between their primary and secondary windings. Therefore, CT calibrations are usually geared towards a specific type of ammeter.

    Browse the broad range of Current Transformers RS have to offer and order today for next-day delivery.

    1719 產品顯示為 Current Transformers

    Better World
    HK$1,754.50
    Schneider Electric
    3000:5
    -
    METSECT
    Tropicalise
    -
    -
    3000A
    5 A
    160mm
    99mm
    78.4mm
    -25°C
    +60°C
    Yes
    Green Premium
    Surface Mount
    Better World
    • RS庫存編號 219-8415
    • 製造零件編號 LV480885
    HK$468.55
    Schneider Electric
    150:5
    -
    LV48
    -
    -
    -
    -
    -
    78mm
    60mm
    -
    -
    -
    Yes
    Green Premium
    -
    HK$894.11
    Lovato
    150:5
    32 x 21mm
    DM
    Split Core
    Current Transformer
    -
    -
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,134.55
    Lovato
    400:5
    80 x 80mm
    DM
    Split Core
    Current Transformer
    -
    -
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 279-2424
    • 製造零件編號 855-3001/060-003
    HK$973.40
    WAGO
    60:1
    -
    855
    Split Core
    Current Transformer
    -
    60A
    1 A
    -
    -
    -
    -
    -
    -
    -
    -
    HK$814.50
    LEM
    10:1
    16mm
    AT
    -
    -
    20 → 30 V dc
    10A
    4 → 20 mA
    67mm
    44.5mm
    36.5mm
    -20°C
    +60°C
    -
    -
    Cable Tie
    HK$692.80
    LEM
    20:1
    16mm
    AT
    -
    -
    20 → 30 V dc
    20A
    4 → 20 mA
    67mm
    44.5mm
    114.5mm
    -20°C
    +60°C
    -
    -
    Cable Tie
    HK$2,000.20
    Siemens
    -
    13mm
    7KT12
    Straight Through
    -
    -
    100A
    -
    90mm
    105mm
    64mm
    -
    -
    -
    -
    DIN Rail
    • RS庫存編號 775-2714
    • 製造零件編號 CTSCMICRO19-200/5-T-S
    HK$477.40
    HOBUT
    200:5
    -
    CTSCM
    Split Core
    -
    -
    -
    -
    78mm
    58mm
    49mm
    -30°C
    +55°C
    -
    -
    -
    • RS庫存編號 729-5508
    • 製造零件編號 AC-1025
    HK$39.30
    Nuvotem Talema
    25:1
    -
    AC-1
    -
    -
    -
    25A
    -
    -
    15.9mm
    30.2mm
    -40°C
    +120°C
    -
    -
    Through Hole
    HK$1,632.10
    LEM
    100:1
    32mm
    DHR
    -
    Open Loop
    20 → 50 V dc
    100A
    4 → 20 mA
    70mm
    90mm
    25mm
    -40°C
    +70°C
    -
    -
    Panel Mount
    HK$994.00
    LEM
    100:1
    18mm
    APR
    -
    Closed Loop
    24 V dc
    50 A, 75 A, 100A
    0 → 5 V, 0 → 10 V
    69mm
    67mm
    55mm
    -20°C
    +60°C
    -
    -
    DIN Rail
    HK$994.00
    LEM
    50:1
    18mm
    APR
    -
    Closed Loop
    24 V dc
    10 A, 25 A, 50A
    0 → 5 V, 0 → 10 V
    69mm
    67mm
    55mm
    -20°C
    +60°C
    -
    -
    DIN Rail
    • RS庫存編號 914-5272
    • 製造零件編號 CT160-5-L7
    HK$237.90
    HOBUT
    -
    -
    Series 16
    -
    -
    -
    -
    -
    -
    -
    -
    -30°C
    +85°C
    -
    -
    DIN Rail
    HK$398.50
    LEM
    1200:1
    40.5 x 30.5mm
    HAT
    -
    Open Loop
    15 V
    400A
    -
    65mm
    90mm
    37mm
    -10°C
    +80°C
    -
    -
    Busbar, Plug In
    • RS庫存編號 351-910
    • 製造零件編號 MI100
    HK$782.00
    Carlo Gavazzi
    100:1
    -
    M
    -
    -
    -
    100A
    -
    67.5mm
    95mm
    20mm
    -20°C
    +60°C
    -
    -
    -
    HK$387.40
    LEM
    600:1
    40.5 x 30.5mm
    HAT
    -
    Open Loop
    15 V
    200A
    -
    65mm
    90mm
    10mm
    -10°C
    +80°C
    -
    -
    Busbar, Plug In
    HK$140.40
    HOBUT
    40:5
    21mm
    CT132
    DIN Rail Mounted
    -
    -
    40A
    5 A
    65mm
    45mm
    30mm
    -30°C
    +85°C
    -
    -
    DIN Rail Mounted
    HK$448.10
    Honeywell
    90:1
    -
    CSNP
    -
    Closed Loop
    12 → 15 V dc
    90A
    50 mA
    29.6mm
    36.6mm
    14.45mm
    -40°C
    +85°C
    -
    -
    PCB Mount
    整套:1 个
    HK$3,533.83
    Chauvin Arnoux Energy
    100:1
    24mm
    TC CLIP
    Split Core
    -
    -
    100A
    1 A
    -
    -
    -
    -20°C
    +50°C
    -
    -
    Plug In
    每頁顯示的結果