Measuring the True RMS Current in Phase Angle Controlled Loads

Most current transformers suffer from severely inaccurate measurements of the load current in phase angle controlled loads. This is because they tend to respond mainly to the peaks of the signal which have little to do with the actual current present in the load circuit.  A true RMS analysis of the current waveform is required to get an accurate value.

Our RMS Current transformer – NWCT is a True RMS current transducer that can be ordered as 0-10V or 4-20mA output. The output is proportional to the current in the conductor passed through the sense transformer. The advantage to the NWCT is that it can sense distorted sinusoidal signals such as phase control and provide a True RMS output of the signal. The NWCT Current Transformer uses the latest in signal processing technologies to provide true RMS 4-20mA or 0-10V output of distorted AC current signals such as phase angle controlled loads.

True RMS Current Transformer NWCT

 

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