A New Method for Power Current Measurement Using a Coreless Hall Effect Current Transformer

Chen, Kun‐Long; Chen, Nanming

doi:10.1109/tim.2010.2049234

Cited by 82 publications

(35 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the sensitivity and the quiescent output voltage of Hall sensors are influenced by the ambient temperature, a few previous works [22,23] focused on how to resolve the thermal drift problems. Additionally, current measurement is one of the main applications related to Hall sensors, and most researches focused on the small current measurement [24] or the large current (fault current) measurement in the three-phase power systems [19,25].…”

Section: Hall-based Electronic Current Transformermentioning

confidence: 99%

“…In a three-phase power system, there is serious magnetic field interference in the space. Regarding the designs concentrating on the magnetic field measurement without using iron cores, the previous works [19,28] recently proposed a coreless Hall-effect current transformer, called an HCT. In this design, four Hall sensors are placed symmetrically around the measured cable without an iron core, and the ambient magnetic field interference can be effectively eliminated by averaging the outputs of these four Hall sensors.…”

Section: Hall-based Electronic Current Transformermentioning

confidence: 99%

“…Nowadays, some ECT technologies are commercialized, and related standards such as International Electrotechnical Commission (IEC) 61850 have been issued for Most sensing components within ECTs are semiconductor materials, meaning the reliability of ECTs would be worse than that of traditional CTs. Our study focuses on proposing a new redundancy mechanism for the coreless Hall-effect current transformer (HCT) [19] to enhance its reliability. The HCT is a sort of ECT, which places four Hall sensors symmetrically around the measured cable.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Redundancy Mechanism Design for Hall-Based Electronic Current Transformers

et al. 2017

Self Cite

View full text Add to dashboard Cite

Abstract:Traditional current transformers (CTs) suffer from DC and AC saturation and remanent magnetization in many industrial applications. Moreover, the drawbacks of traditional CTs, such as closed iron cores, bulky volume, and heavy weight, further limit the development of an intelligent power protection system. In order to compensate for these drawbacks, we proposed a novel current measurement method by using Hall sensors, which is called the Hall-effect current transformer (HCT). The existing commercial Hall sensors are electronic components, so the reliability of the HCT is normally worse than that of the traditional CT. Therefore, our study proposes a redundancy mechanism for the HCT to strengthen its reliability. With multiple sensor modules, the method has the ability to improve the accuracy of the HCT as well. Additionally, the proposed redundancy mechanism monitoring system provides a condition-based maintenance for the HCT. We verify our method with both simulations and an experimental test. The results demonstrate that the proposed HCT with a redundancy mechanism can almost achieve Class 0.2 for measuring CTs according to IEC Standard 60044-8.

show abstract

Section: Hall-based Electronic Current Transformermentioning

confidence: 99%

Section: Hall-based Electronic Current Transformermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Redundancy Mechanism Design for Hall-Based Electronic Current Transformers

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The main disadvantage of using a single pair of sensors is that the suppression of the external currents by the gradiometric sensor is low. Using four sensors around the conductor reduces this error to 6% in the close vicinity [8]. A circular sensor array with 6 and more sensors around the conductor approximates better the closed line integral in Ampere's law.…”

Section: Introductionmentioning

confidence: 99%

Off-Center Error Correction of AMR Yokeless Current Transducer

Mlejnek

Ripka

2017

Journal of Sensors

View full text Add to dashboard Cite

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%.

show abstract

“…6 Circular array of DC magnetic sensors is much more effective in this respect. 7 Circular arrays use Hall sensors, 8,9 but these suffer from poor DC stability. AMR sensors have small offset and drift, but due to their small range they can be used only for current sensors up to tens of Amps.…”

Section: Introductionmentioning

confidence: 99%

The effect of conductor permeability on electric current transducers

et al. 2017

View full text Add to dashboard Cite

In this paper, experimental works and theoretical analysis are presented to analyze the influence of the conductor permeability on the precision of yokeless current sensors. The results of finite-element method (FEM) fit well the measured field values around the conductor. Finally we evaluate the difference in magnetic fields distribution around non-magnetic and magnetic conductor. The calculated values show that the permeability of the ferromagnetic conductor significally affects the reading of the electric current sensors even at DC.

show abstract

A New Method for Power Current Measurement Using a Coreless Hall Effect Current Transformer

Cited by 82 publications

References 6 publications

A Redundancy Mechanism Design for Hall-Based Electronic Current Transformers

A Redundancy Mechanism Design for Hall-Based Electronic Current Transformers

Off-Center Error Correction of AMR Yokeless Current Transducer

The effect of conductor permeability on electric current transducers

Contact Info

Product

Resources

About