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Clamp-on Current Transducers
There are five basic types, with popular devices available ex-stock. All can be manufactured to customer’s exact specification.
Sales Team: +44 7871 375037
1. Hall Effect
Combined AC & DC input sensor with a voltage output.
These sensors combines a magnetic core with a gap into which is inserted a Hall Effect sensor — an electronic device which responds to a magnetic field. With associated electronic circuitry, the output is an image of the measured current. These devices can be supplied powered either from an external source or, for portable applications, a battery. A special model providing just a DC output is available.
Different models are available covering a range from 100Amp to 7,500Amp peak or DC.
2. Clamp-on Current Transformer
Since with a clamp-on CT the input has just one turn, the amplitude of the output current is reduced by the number of secondary turns. E.g. with a 1000 turns and a current of 1000 Amps, the output would be 1 Amp. Such basic CTs are therefore ideal for interfacing to legacy instruments which require 5 Amp or 1 Amp inputs, such as traditional kWh Meters.
For a 5 Amp output, medium & large models are available from ~ 250 Amp (depending on application) to 3000 Amp; with a 1 Amp output, small models are available at 100 & 200 Amp while medium & large as above.
3. Injection Clamps
Designed to inject an AC voltage signal into a cable to allow the route of the cable to be traced. Custom designed for each application.
4. Clamp-On Current Transformer or Transducer With AC Voltage Output.
Here, a resistor is fitted across the output terminals of the transformer to provide an AC voltage signal. The output depends both on the number of turns & the resistor, which allows the sensor design to be optimised for performance. Different models cover a range from 1 Amp to 3000 Amp. Output level of 1V is common but can vary from 100mV to 10V.
These are recommended for new designs.