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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RS庫存編號 175-6161
製造零件編號4NC5222-2DE21
BrandSiemens
HK$553.45
單位
200:5 - Window 67.6mm 60.6mm 78.4mm 200A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 914-5326
製造零件編號CT140F-600/5-2.5/1-31
BrandHOBUT
HK$271.47
單位
- 31mm - - - - - - -30°C +80°C 140 x 90 x 38 mm - Foot CT140
RS庫存編號 175-6140
製造零件編號4NC5121-0CC21
BrandSiemens
HK$528.28
單位
150:1 - Window 65.6mm 60mm 75.3mm 150A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
全新
RS庫存編號 203-2054
製造零件編號3RB2906-2DG1
BrandSiemens
HK$1,609.70
單位
- - Straight Through 83mm 45.3mm - 2.4 → 25A 25 A - - - - Stand Alone SIRIUS
RS庫存編號 173-0060
製造零件編號AC-1200
HK$72.776
個 (以毎盒:27)
單位
- - - - - - 200A - -40°C +120°C 55.6 x 20.6 x 55.6 mm - Through Hole -
RS庫存編號 181-0077
製造零件編號MR-2
BrandKEMET
HK$105.68
單位
- - - - - - - - - - - - - -
RS庫存編號 173-0055
製造零件編號AX-1500
HK$31.083
個 (以毎盒:250)
單位
- - - - - - 15A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS庫存編號 136-6362
製造零件編號XM07-275081S000000
HK$105.06
單位
250:5 26mm - 70mm 50mm 44.5mm 250A 5 A - - 50 x 44.5 x 70 mm - BusBar, Cable Mount, DIN Rail, Wall Mount Omega
RS庫存編號 124-3890
BrandRS PRO
HK$28.85
單位
- - - - - - 40 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS庫存編號 124-3902
BrandRS PRO
HK$28.05
單位
- - - - - - 50A - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS庫存編號 171-8785
BrandRS PRO
HK$117.47
單位
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 -
RS庫存編號 123-9532
製造零件編號4NC5328-2CE20
BrandSiemens
HK$721.50
單位
750:5 36mm Window - - - 750A 5 A -10°C 55°C 82.5 x 80 x 98 mm Measuring Devices Panel Mount 4NC
全新
RS庫存編號 198-4496
製造零件編號METSECT5MA040
HK$515.72
單位
400:5 27mm Tropicalise 80mm 56mm 63mm 400A 5 A -25°C +60°C - - DIN rail -
RS庫存編號 381-0816
製造零件編號CT196M1200/5-5/1
BrandHOBUT
HK$241.50
單位
1200:5 45mm Base Mounted 126mm 90mm 60mm - - -30°C +85°C - - - -
全新
RS庫存編號 198-4508
製造零件編號METSECT5MD060
HK$675.42
單位
600:5 40mm Tropicalise 95mm 70mm 65mm 600A 5 A -25°C +60°C - - DIN rail -
RS庫存編號 775-2705
製造零件編號CTSCMICRO19-150/5-T-S
BrandHOBUT
HK$440.35
單位
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS庫存編號 175-6160
製造零件編號4NC5222-2CE21
BrandSiemens
HK$478.62
單位
200:5 - Window 67.6mm 60.6mm 78.4mm 200A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 537-4508
製造零件編號AC-1015
HK$31.172
/個 (每包:5個)
單位
- - - - - - 15A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS庫存編號 171-8788
BrandRS PRO
HK$117.47
單位
250:5 40 x 11mm Clip Fit 78mm 62mm 40mm 250A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS庫存編號 729-5508
製造零件編號AC-1025
HK$36.49
單位
- - - - - - 25A - -40°C +120°C 30.2 x 14.3 x 30.2 mm - Through Hole -