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.


...
Voir plus Voir moins

Filtres

Afficher 101 - 120 des 769 produits
Nombre de résultats par page
Description Prix Current Ratio Inner Diameter Transformer Type Overall Height Overall Width Overall Depth Input Current Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
N° de stock RS 886-2190
Référence fabricantXM20-335131S000000
25,88 €
Each
Unité
600:5 60mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
N° de stock RS 175-6173
Référence fabricant4NC5225-2DE21
MarqueSiemens
73,89 €
Each
Unité
400:5 - Window 67.6mm 60.6mm 78.4mm 400A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
Nouveau
N° de stock RS 198-4478
Référence fabricantMETSECT5DC200
223,75 €
Each
Unité
2000:5 - Tropicalise 160mm 125mm 87mm 2kA 5 A -25°C +50°C - - Surface Mount -
N° de stock RS 167-0135
Référence fabricantB82801B0205A100
MarqueEPCOS
0,873 €
Each (On a Reel of 900)
Unité
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
N° de stock RS 171-8749
MarqueRS PRO
17,36 €
Each
Unité
50:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
N° de stock RS 122-0548
Référence fabricant48290501
MarqueSocomec
16,18 €
Each
Unité
- 8.6mm - - - - - - -10°C +70°C 45 x 28 x 20 mm DIRIS B-30, DIRIS Digiware DIN Rail TE-18
N° de stock RS 171-8785
MarqueRS PRO
14,19 €
Each
Unité
100:5 40 x 11mm Clip Fit 78mm 62mm 40mm 100A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
N° de stock RS 175-6202
Référence fabricant4NC5432-2DH21
MarqueSiemens
110,70 €
Each
Unité
1000:5 64mm Window 84.1mm 112mm 127.5mm 1kA 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 775-4956
Référence fabricantAP-2000
2,52 €
Each
Unité
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
N° de stock RS 123-6711
Référence fabricantXN25-145011S000000
33,25 €
Each
Unité
60:5 31mm Base Mounted - - - 60A 5 A - - 75 x 60 x 87.5 mm MCCB BusBar, DIN Rail, Plug In Omega
N° de stock RS 171-8763
MarqueRS PRO
10,43 €
Each
Unité
80:5 30 x 10mm Clip Fit 70mm 50mm 31mm 80A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
N° de stock RS 331-468
Référence fabricantCT132M120/5-2.5/1
MarqueHOBUT
15,28 €
Each
Unité
120:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
N° de stock RS 331-547
Référence fabricantCT164M400/5-5/1-001
MarqueHOBUT
22,23 €
Each
Unité
400:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
N° de stock RS 881-7944
Référence fabricant2CSG225865R1101
MarqueABB
30,96 €
Each
Unité
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
N° de stock RS 881-7950
Référence fabricantCTPROXT150SELV
MarqueABB
36,63 €
Each
Unité
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
N° de stock RS 175-6190
Référence fabricant4NC5330-0CE21
MarqueSiemens
81,09 €
Each
Unité
750:1 - Window 84.1mm 82.5mm 98mm 750A 1 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 162-0271
Référence fabricantB82801C1265A150
MarqueEPCOS
1,905 €
Each (On a Reel of 200)
Unité
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
N° de stock RS 171-8858
MarqueRS PRO
18,72 €
Each
Unité
20:5 62 x 40mm Clip Fit 78mm 62mm 40mm 20A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
N° de stock RS 886-2156
Référence fabricantXM13-335111S000000
14,18 €
Each
Unité
600:5 40mm Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
N° de stock RS 772-1212
Référence fabricant5SV8700-0KK
MarqueSiemens
83,34 €
Each
Unité
- 20mm Toroidal Ring 34mm - - - - -10°C +50°C - - - -