On-Line Detection of Railway Power Frequency Current Based on Tunnel Magnetoresistance

Xu, X. P.; Chen, H.Y.; Liu, T. Z.; Zhu, Min; Wang, Jianguo

doi:10.1109/tim.2022.3232640

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Among magnetoresistance effect components, sensors based on tunnel magnetoresistance (TMR) effect have been used as the fourth generation magnetoresistance sensors in fields such as power grid current measurement and current monitoring [16][17][18][19]. As the fourth generation magnetoresistance sensor based on tunnel magnetoresistance (TMR) effect, it has been applied in fields such as current measurement in power grid and other current monitoring [16][17][18][19]. However, the sensitivity of TMR is temperature dependent with a negative temperature coefficient.…”

Section: Introductionmentioning

confidence: 99%

Research on TMR Current Transducer With Temperature Compensation Based on Reference Magnetic Field

Li,

Pan,

et al. 2023

IEEE Access

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TMR magnetoresistance sensors have advantages such as small size and low power consumption in the field of current measurement, but their sensitivity temperature dependence limits their application in the field of electric energy metering. A temperature compensation method based on reference magnetic field was proposed, which uses a constant current source and an iron core with an air gap to construct the reference magnetic field. The structures of the reference magnetic field channel and the measurement channel are the same, which the TMR sensors used are the same, and the signal processing circuits are the same. By analyzing the relationship between the air gap magnetic field and the primary current, a mathematical model was established between the input current and the sensor output voltage, thus providing support for the temperature compensation method of the TMR current sensor. The effectiveness of the temperature compensation method for TMR current transducer based on reference magnetic field is verified by the test data of the nonlinear characteristics and temperature characteristics. The results show that the temperature compensation method based on reference magnetic field reduces the temperature dependence of the sensor from -369ppm/℃ to -49ppm/℃. The proposed temperature compensation method does not require additional temperature sensors and does not require prior acquisition of TMR temperature characteristics, making it specific and universal.INDEX TERMS iron core, reference magnetic field, sensitivity temperature dependence, TMR current transducer

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Section: Introductionmentioning

confidence: 99%

Research on TMR Current Transducer With Temperature Compensation Based on Reference Magnetic Field

Li,

Pan,

et al. 2023

IEEE Access

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“…The measurement of the flowing rail current could then be achieved by using Rogowski coils that ensure a complete rejection of common-mode signals and a more favorable signalto-noise ratio. Another method of rail current measurement that allows train circulation, and can be a semi-permanent installation, is by means of close-up sensors, based on the inductive effect [36], with arrays of such elementary sensors for better reconstruction [37], or alternative methods, such as the Hall or magneto-resistive effect [38].…”

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confidence: 99%

Uncertainty of Standardized Track Insulation Measurement Methods for Stray Current Assessment

Bhagat

Bongiorno

Mariscotti

2023

Sensors

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Stray current is a relevant phenomenon in particular for DC electrified transportation systems, affecting track and infrastructure within the right of way and other structures and installations nearby. It worsens with time and the level of protection depends on timely maintenance, as well as correct design choices. The assessment of track insulation is the starting point for both stray current monitoring systems and at commissioning or upon major changes. Standardized methods (ref. EN 50122-2 or IEC 62128-2) have been almost unchanged in the last 20 years but suffer from accuracy issues and variability due to parameters and conditions not under the operator’s control. The uncertainty of test methods is increasingly important now that contractual specifications require a high level of insulation for new systems. A critical discussion and analysis of the sources of variability and practical constraints is proposed, followed by an evaluation of uncertainty, with the objective not only to assess the accuracy of the provided results, but also to foster research on innovative, more flexible and accurate methods.

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Uncertainty of Standardized Track Insulation Measurement Methods for Stray Current Assessment

Bhagat¹,

Bongiorno²,

Mariscotti³

2023

Preprint

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Stray current is a relevant phenomenon in particular for DC electrified transportation systems, affecting the track and infrastructure within the right of way and other structures and installations nearby. It worsens with time and the level of protection depend on timely maintenance, besides correct design choices. The assessment of track insulation is the starting point for both stray current monitoring systems and at commissioning or upon major changes. Standardized methods (ref. EN 50122-2, or IEC 62128-2) are almost unchanged in the last 20 years, but suffer from accuracy issues and variability due to parameters and conditions not under operator’s control. A critical discussion and analysis of the sources of variability and practical constraints is proposed, followed by the evaluation of uncertainty, with the objective not only to assess the accuracy of provided results, but to foster research on innovative, more flexible and accurate, methods.

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On-Line Detection of Railway Power Frequency Current Based on Tunnel Magnetoresistance

Cited by 3 publications

References 13 publications

Research on TMR Current Transducer With Temperature Compensation Based on Reference Magnetic Field

Research on TMR Current Transducer With Temperature Compensation Based on Reference Magnetic Field

Uncertainty of Standardized Track Insulation Measurement Methods for Stray Current Assessment

Uncertainty of Standardized Track Insulation Measurement Methods for Stray Current Assessment

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