Work

Development of a proximity contactless ammeter based on GMR sensors for measuring direct currents

Year: 2024

Type: article

Abstract: Conventional ammeters are inserted in series with the element in which the current is to be measured, constituting an invasive measurement form. Clamp ammeters measure non-invasively but are limited to alternating currents. For continuous currents measurements, Hall-based clamp ammeters are used, with low output voltages and little stability to temperature. Also, the need to involve the conductor in a magnetic core makes it impractical for some situations. This manuscript describes a proximity contactless ammeter based on giant magnetoresistance sensors capable of measuring direct currents some centimeters away from the conductor, non-invasively and with high resolution. Sixty tests were performed, with currents varying from −3 A to 3 A, with steps of 0.1 A. The prototype was able to estimate the current with type A expanded uncertainties of 100 mA and 0.19 cm for the distance. The results demonstrate the feasibility of conducting contactless current measurements using GMR sensors.

Source: Measurement Sensors

DOI: 10.1016/j.measen.2024.101444

Authors: Camila Schuina Neves, Carlos Roberto Hall Barbosa, Eduardo Costa da Silva, Daniel Prado de Magalhães, Luiz Antonio Pereira Gusmão

Institution: Pontifícia Universidade Católica do Rio de Janeiro

Language: English

Topic: Magnetic Field Sensors Techniques

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,800

Funders: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Financiadora de Estudos e Projetos