Current Transformers

Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. The transformers consist of a core, a primary and a secondary winding. 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 a "step-down transformers". Once the current has been reduced it can be safely monitored and measured using an ammeter.


Current transformers can perform circuit control and perform roles for safety protection and current limiting.


Current transformers are found in:


  • Generating stations,

  • Electrical substations

  • Commercial electric power distribution.

Types of Current Transformers


Toroidal Current Transformer - These transformers are shaped like a doughnut they do not contain a primary winding. Instead, the line that carries the current flowing in the network is threaded through a window or hole in the toroidal transformer. Toroidal transformers offer high efficiency with minimal excess noise and little excess leakage inductance.


Wound Current Transformer - The transformers primary winding is physically connected in series with the conductor that carries the measured current flowing in the circuit. The magnitude of the secondary current is dependent on the turns ratio of the transformer.


Bar-type Current Transformer – This type of current transformer uses the actual cable or bus-bar of the main circuit as the primary winding, which is equivalent to a single turn. They are fully insulated from the high operating voltage of the system and are usually bolted to the current carrying device.


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Omschrijving Prijs Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS-stocknr. 124-3888
FabrikantRS PRO
1,38 €
Each
Aantal stuks
75:1 - - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS-stocknr. 171-8817
FabrikantRS PRO
39,51 €
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2000:5 80 x 12mm Clip Fit - - 2000A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 171-8813
FabrikantRS PRO
29,61 €
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Aantal stuks
1200:5 80 x 12mm Clip Fit - - 1200A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 171-8815
FabrikantRS PRO
34,95 €
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Aantal stuks
1500:5 80 x 12mm Clip Fit - - 1500A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 171-8753
FabrikantRS PRO
12,01 €
Each
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80:5 21 x 10mm Clip Fit - - 80A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8776
FabrikantRS PRO
18,07 €
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400:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS-stocknr. 171-8808
FabrikantRS PRO
33,43 €
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1500:1 61 x 51mm - - - - - 110mm - 86mm - 45mm 86 x 45 x 110 mm -
RS-stocknr. 171-8797
FabrikantRS PRO
21,26 €
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- - - - - - - - - - - - - -
RS-stocknr. 171-8804
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29,61 €
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1000:5 41 x 41mm Clip Fit - - 1000A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS-stocknr. 171-8859
FabrikantRS PRO
18,84 €
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30:5 62 x 40mm Clip Fit - - 30A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8749
FabrikantRS PRO
17,47 €
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50:1 21 x 10mm - - - - - 65mm - 45mm - 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8772
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16,57 €
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250:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS-stocknr. 171-8842
FabrikantRS PRO
72,78 €
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1500:5 101 x 56mm Clip Fit - - 1500A 5 A 170mm -5°C 130mm +55°C 60mm 130 x 60 x 170 mm -
RS-stocknr. 171-8802
FabrikantRS PRO
28,71 €
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800:5 41 x 41mm Clip Fit - - 800A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS-stocknr. 171-8823
FabrikantRS PRO
49,85 €
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3000:5 100 x 30mm Clip Fit - - 3000A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS-stocknr. 171-8793
FabrikantRS PRO
21,26 €
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400:1 40 x 11mm - - - - - 78mm - 62mm - 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8781
FabrikantRS PRO
18,69 €
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100:5 30 x 11mm Clip Fit - - 100A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 124-3903
FabrikantRS PRO
1,39 €
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Aantal stuks
120:1 - - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8838
FabrikantRS PRO
78,99 €
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Aantal stuks
2000:5 38 x 128mm Base Mounted - - 2000A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS-stocknr. 171-8756
FabrikantRS PRO
12,76 €
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Aantal stuks
125:5 21 x 10mm Clip Fit - - 125A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
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