Current Transducers / Current Clamps
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Current Transducers / Current Clamps
Current Transducers, or current sensors are a sensor that detects electric current in a wire. The current is converted into an electrical signal proportional to the current value. This section includes dedicated AC and DC current clamps, or combined AC & DC current measurements. Technologies include Zero Flux current transducers or Rogowski coil current transducers, but all are high performance, high accuracy. All sensors are isolated for high electrical safety rating. Sensors are available in configurable measurement range with power supplies and cabling also supplied. Applications include power measurement and analysis, motor, drive and generator testing.
A current transducer is a transducer used for measuring the current flowing in a wire or conductor. Current transducers can be used to measure DC and / or AC current. The output from the transducer is an analogue current or voltage signal. This can be used as an input to a power analyzer, data acquisition system or meter or control system. Current sensor technologies include current shunts, Rogowski coils, fluxgate sensors (zero flux) and current clamps.
A current sensor is a sensor used for measuring the current flowing in a wire or conductor. Current sensors can be used to measure DC or AC current. The output from the sensor is an analogue current or voltage signal. This can be used as an input to a power analyzer, data acquisition system or meter or control system.
A current clamp is a clamp used for measuring the current flowing in a wire or conductor. Current clamps can be used to measure DC or AC current. The output from the clamp is an analogue current or voltage signal. This can be used as an input to a power analyzer, data acquisition system or meter or control system.
A current sensor is a sensor used to measure the current flowing in a wire or conductor. They are known by several names such as current sensor, current transducer or current clamp. Applications include power measurement and current monitoring on motors, generators, transformers and any electrical installation. A current sensor can be used to measure AC and DC current, depending on the measurement technology.
Once current is supplied through a wire or a conductor, then a voltage drop takes place and a magnetic field will be generated around the current carrying conductor. There are two kinds of current sensing, these are direct current sensing & indirect current sensing. Direct sensing uses Ohm’s law whereas indirect sensing uses Ampere’s & Faraday’s law.
Direct sensing is used to measure the voltage drop associated with the flow of current throughout passive electrical components known as shunt resistors. Direct sensing is used to measure current up to 20ARMS. This is based on Ohm’s law.
Similarly, indirect sensing is used to measure the magnetic field nearby a current-carrying conductor. After that, the magnetic field which is produced is used for inducing proportional current or voltage which is afterward changed to use for measurement or control purposes.
Our current sensor product range consists of fluxgate transducers and Rogowski coil sensors. Zeroflux transducers have the highest accuracy and very high bandwidth, whilst Rogowski coil sensors have excellent accuracy and ultra high bandwidth. Our power analyzers have direct current inputs for current measurement up to 20A RMS.
A current transformer steps the current up or down from its source. It can be used for measuring current, with a lot of turns, for example, 1000 to 1 turns ratio. A current transducer on the other hand directly converts the energy into another type of energy. For example, electric current into a voltage output signal.
Current sensors can be made using several techniques and each has its own pros and cons. Selection of the current sensor to be used depends on requirements such as magnitude, accuracy, bandwidth, robustness, cost, isolation or size. The user also needs to consider the installation environment.
The accuracy of current sensors is dependent on the technology used with the sensor. The highest accuracy is achieved with fluxgate sensors which have an accuracy of 1ppm. Rogowski coil sensors are calibrated to an accuracy of ±0.2% with the conductor central in the coil. High bandwidth burden resistors have an accuracy of ±0.03% of reading from 0.5 Hz to 1 kHz.
Current Overview
