High-fidelity low-cost electronic current sensor for utility power metering

Neville McNeill, Harry Dymond, Phil Mellor

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The design of a high-fidelity electronic current sensor for utility power-metering applications is described. The sensor is based around a current transformer with a low-permeability core material in order to yield a high dc tolerance and improved immunity to extraneous dc magnetic fields. The transformer is configured with a flux-change sense winding and feedforward of the voltage developed across the secondary winding and burden resistances. This minimizes the error due to magnetizing current which would otherwise be high with a low-permeability core material. Experimental results are given for a 60-A sensor designed for single-phase 50- and 60-Hz systems. Measured phase error is less than 0.6° at 50 Hz with 60-A dc current superimposed onto the current under measurement. No Hall-effect sensors or core-gapping operations are required. Combined with simple analog electronic circuitry, this provides a low-cost solution.
Original languageEnglish
Pages (from-to)2309-2317
Number of pages9
JournalIEEE Transactions on Power Delivery
Issue number4
Early online date26 Jul 2011
Publication statusPublished - 31 Oct 2011


  • smart meter
  • current sensor
  • current transformer (CT)


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