Multifunctional Coreless Hall-Effect Current Transformer for the Protection and Measurement of Power Systems

Tsai, Yuan-Pin; Chen, Kun‐Long; Chen, Yanru; Chen, Nanming

doi:10.1109/tim.2013.2281555

Cited by 41 publications

(19 citation statements)

References 16 publications

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“…Circular arrays of Hall sensors have received significant attention [81][82][83][84] . The main advantage of a circular array is that it provides much better suppression of external currents than a differential sensor configuration.…”

Section: Circular and Rectangular Sensor Arraysmentioning

confidence: 99%

Contactless measurement of electric current using magnetic sensors

Ripka

2019

Tm - Technisches Messen

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We review recent advances in magnetic sensors for DC/AC current transducers, especially novel AMR sensors and integrated fluxgates, and we make critical comparison of their properties. Most contactless electric current transducers use magnetic cores to concentrate the flux generated by the measured current and to shield the sensor against external magnetic fields. In order to achieve this, the magnetic core should be massive. We present coreless current transducers which are lightweight, linear and free of hysteresis and remanence. We also show how to suppress their weak point: crosstalk from external currents and magnetic fields.

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Section: Circular and Rectangular Sensor Arraysmentioning

confidence: 99%

Contactless measurement of electric current using magnetic sensors

Ripka

2019

Tm - Technisches Messen

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“…Hall sensors, Lorenz-force sensors, Anisotropic magnetoresistors (AMR) and Giant magnetoresistors (GMR), and also microfluxgate sensors, are magnetic sensors that are suitable for yokeless current transducers. Hall sensors are used in [10], and in [14]. Thanks to their range up to 2T, they can measure very high currents in the kA range.…”

Section: Introductionmentioning

confidence: 99%

A 3-phase current transducer based on microfluxgate sensors

2019

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Novel 3-phase DC/AC current transducer for 3-phase current lines is based on 8 integrated fluxgate sensors. Using full information from each sensor rather than gradiometric pairs, we suppress crosstalk between individual phases and external magnetic fields up to the 4th order gradients. The suppression of external currents at a distance of 1 m is 90 dB. The main advantage of the used microfluxgates is excellent temperature stability allowing operation outside the laboratory: the achieved temperature coefficient of the sensitivity is 50 ppm/K, and the offset stability is 1 mA/K. These values are 20-times better than temperature stability achievable with current transducers sensors based on Hall sensors and magnetoresistors.

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“…The second motivation for a yokeless solution may be to increase the safety distance from the high-voltage conductor. And the third reason for avoiding the use of ferromagnetic materials is the danger of saturation by overcurrent [3]. If the DC operation is not required, Rogowski coils or similar devices can be used [4].…”

Section: Introductionmentioning

confidence: 99%

“…Low sensitivity and poor temperature stability of the sensitivity and offset are also disadvantage of magnetoelectric sensors [13]. Hall sensors have very large field range, but they have very poor DC offset temperature stability and limited linearity [3].…”

Section: Introductionmentioning

confidence: 99%

Off-Center Error Correction of AMR Yokeless Current Transducer

Mlejnek

Ripka

2017

Journal of Sensors

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We present a method of calibration and error correction of the AMR yokeless current transducer consisting of a circular array of eight anisotropic magnetoresistors (AMR) with one feedback compensation loop. The main sources of errors are the nonidentical parameters of AMR sensors and off-center position of the measured current. It is well known that AMR sensors from the same batch have 2% spread of the sensitivity; we found that the variation of the factor of the internal compensation coil is the same. We developed a novel calibration process using the readings of individual residual uncompensated voltages of the AMRs. The position of the current inside the measurement hole is estimated from the individual voltages considering the influence of external DC magnetic field such as the Earth's field. During the calibration phase, the sensor outputs are measured for several positions of the current conductor inside the measuring hole. As a result of calibration the lookup table of error corrections is calculated and stored in the memory, and then these values are used for the correction during the measurement of the unknown current. This procedure reduces the off-center error from 0.4% to 0.06%.

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Multifunctional Coreless Hall-Effect Current Transformer for the Protection and Measurement of Power Systems

Cited by 41 publications

References 16 publications

Contactless measurement of electric current using magnetic sensors

Contactless measurement of electric current using magnetic sensors

A 3-phase current transducer based on microfluxgate sensors

Off-Center Error Correction of AMR Yokeless Current Transducer

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