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. 124-3900
FabrikantRS PRO
3,86 €
Each
Aantal stuks
10:1 - - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 173-0235
FabrikantRS PRO
3,49 €
Each (In a Box of 351)
Aantal stuks
10:1 - - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8776
FabrikantRS PRO
18,07 €
Each
Aantal stuks
400:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS-stocknr. 171-8806
FabrikantRS PRO
33,43 €
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1250:1 61 x 51mm - - - - - 110mm - 86mm - 45mm 86 x 45 x 110 mm -
RS-stocknr. 171-8835
FabrikantRS PRO
62,45 €
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1250:5 38 x 128mm Base Mounted - - 1250A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS-stocknr. 173-0041
FabrikantRS PRO
1,004 €
Each (In a Box of 351)
Aantal stuks
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8777
FabrikantRS PRO
12,29 €
Each
Aantal stuks
400:5 30 x 10mm Clip Fit - - 400A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS-stocknr. 171-8836
FabrikantRS PRO
72,78 €
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Aantal stuks
1500:5 38 x 128mm Base Mounted - - 1500A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 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. 171-8857
FabrikantRS PRO
18,84 €
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Aantal stuks
15:5 62 x 40mm Clip Fit - - 15A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8807
FabrikantRS PRO
27,96 €
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1250:5 61 x 51mm Clip Fit - - 1250A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
RS-stocknr. 171-8760
FabrikantRS PRO
12,76 €
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200:5 21 x 10mm Clip Fit - - 200A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8763
FabrikantRS PRO
10,49 €
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80:5 30 x 10mm Clip Fit - - 80A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS-stocknr. 171-8839
FabrikantRS PRO
85,08 €
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Aantal stuks
2500:5 38 x 128mm Base Mounted - - 2500A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS-stocknr. 173-0045
FabrikantRS PRO
2,129 €
Each (In a Box of 351)
Aantal stuks
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8816
FabrikantRS PRO
36,47 €
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1600:5 80 x 12mm Clip Fit - - 1600A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 171-8858
FabrikantRS PRO
18,84 €
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Aantal stuks
20:5 62 x 40mm Clip Fit - - 20A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 173-0197
FabrikantRS PRO
1,352 €
Each (In a Box of 176)
Aantal stuks
75:1 - - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS-stocknr. 171-8786
FabrikantRS PRO
14,28 €
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Aantal stuks
150:5 40 x 11mm Clip Fit - - 150A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8761
FabrikantRS PRO
12,76 €
Each
Aantal stuks
250:5 21 x 10mm Clip Fit - - 250A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
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