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

Neville McNeill, Harry Dymond, Phil Mellor

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.
LanguageEnglish
Pages2309-2317
Number of pages9
JournalIEEE Transactions on Power Delivery
Volume26
Issue number4
Early online date26 Jul 2011
DOIs
Publication statusPublished - 31 Oct 2011

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Sensors
Costs
Electric instrument transformers
Hall effect
Magnetic fields
Fluxes
Electric potential

Keywords

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

Cite this

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abstract = "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.",
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High-fidelity low-cost electronic current sensor for utility power metering. / McNeill, Neville; Dymond, Harry; Mellor, Phil.

In: IEEE Transactions on Power Delivery, Vol. 26, No. 4, 31.10.2011, p. 2309-2317.

Research output: Contribution to journalArticle

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