Self-calibration method for coreless Hall effect current transformer

Huang, Guan-Jie; Chen, Nanming; Chen, Kun‐Long

doi:10.1109/pesgm.2016.7741826

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…However, current transformers are prone to saturation [3], which can cause difficulties in the implementation of protection functions [4]. Current transformers, due to the presence of iron cores, are very metal intensive [5]. Errors in transient modes can also occur [6].…”

Section: A Study Of the Functioning Of Reed Switches Under The Influence Of A Magnetic Field Created By A Current In A Conductor In A Tramentioning

confidence: 99%

“…There is a DC offset voltage of about 2.5 V existing in Hall integrated circuits and the thermal drift phenomenon of this DC offset may arise due to ambient temperature. Both are factors affecting the accuracy of the Hall-effect current transformer [5].…”

Section: A Study Of the Functioning Of Reed Switches Under The Influence Of A Magnetic Field Created By A Current In A Conductor In A Tramentioning

confidence: 99%

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Determination of the magnitude of short-circuit surge current for the construction of relay protection on reed switches and microprocessors

Neftissov

Biloshchytskyi

Talipov

et al. 2021

EEJET

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A study of the functioning of reed switches under the influence of a magnetic field created by a current in a conductor in a transient mode with the presence of an aperiodic component has been carried out. A well-known method for determining current using reed switches was implemented. At the same time, it was determined that the originally formulated method did not give the required result within the limits of errors. This is most likely due to the peculiarities of the mechanism of movement of the reed switch contacts. Alternatively, the measurements were taken to take the return currents instead of the pick-up currents and the time between the return times. They are more stable. Simulation is performed, experimental determination of the value of surge current by measuring time is carried out. The main element of the created installation was the power transformer coil with low active and high inductive resistance. As part of the study, the reed switches were placed in a magnetic field with an aperiodic component, as in the transient mode. This study will show the applicability of reed switches for the construction of relay protection devices that will not need current transformers to obtain information about the primary current in the conductor. In the course of the research, it was found that the error in determining the magnitude of current was no more than 10 %. Using microprocessors, it is possible to build relay protection devices with a speed of up to 20 ms. This result makes it possible to build new devices. Since in the well-known developments, it was only said about determining the magnitude of current in a steady state. When building relay protection devices on reed switches, without using current transformers, it will be possible to build backup protections that duplicate not only the devices themselves, but also the primary measuring transformers with other sensitive elements. This will improve the reliability of the power supply.

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Section: A Study Of the Functioning Of Reed Switches Under The Influence Of A Magnetic Field Created By A Current In A Conductor In A Tramentioning

confidence: 99%

Section: A Study Of the Functioning Of Reed Switches Under The Influence Of A Magnetic Field Created By A Current In A Conductor In A Tramentioning

confidence: 99%

Determination of the magnitude of short-circuit surge current for the construction of relay protection on reed switches and microprocessors

Neftissov

Biloshchytskyi

Talipov

et al. 2021

EEJET

View full text Add to dashboard Cite

show abstract

“…The approximate positioning method is aimed at deriving the approximate position of the wire and obtaining the mean value according to equations ( 9) and (10). The precise posi tioning method can calculate a more accurate position based on equation (11).…”

Section: Simulation Of the Algorithmsmentioning

confidence: 99%

“…In order to obtain the current in the wire, Ampère's circuital method is used as an approximate way to derive the current I in the wire. The output of the sensors is connected to a weighted adder, which per forms an 'average' operation to obtain the mean value of the sensors in the array [8,10,11]. However, in practical experi ments there is a nonnegligible error between the mean value and the actual value due to positional deviation of the wire.…”

Section: Introductionmentioning

confidence: 99%

Wire-positioning algorithm for coreless Hall array sensors in current measurement

Chen¹,

Zhang²,

Chen³

et al. 2018

Meas. Sci. Technol.

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This paper presents a scheme of circular-arrayed, coreless Hall-effect current transformers. It can satisfy the demands of wide dynamic range and bandwidth current in the distribution system, as well as the demand of AC and DC simultaneous measurements. In order to improve the signal to noise ratio (SNR) of the sensor, a wire-positioning algorithm is proposed, which can improve the measurement accuracy based on the post-processing of measurement data. The simulation results demonstrate that the maximum errors are 70%, 6.1% and 0.95% corresponding to Ampère’s circuital method, approximate positioning algorithm and precise positioning algorithm, respectively. It is obvious that the accuracy of the positioning algorithm is significantly improved when compared with that of the Ampère’s circuital method. The maximum error of the positioning algorithm is smaller in the experiment.

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“…При этом все они основаны на получении информации о токах в линиях от трансформаторов тока, из-за недостатков которых на сессиях СИГРЭ [4,5], а также в высокорейтинговых журналах [6], неоднократно поднимался вопрос о необходимости построения защит без их использования. Анализ публикаций показал, что в настоящее время для построения некоторых защит в качестве датчиков тока предлагается использовать различные магнитоуправляемые элементы: катушки Роговского [7], датчики Холла [8], герконы [6; 9] и т.д. Для построения защиты двух параллельных линий нами выбраны герконы [10], так как они имеют ряд преимуществ перед другими магнитоуправляемыми элементами [6].…”

Section: Introductionunclassified

Исследование Времени Между Срабатываниями Герконов И Их Помехоустойчивости Для Построения Защит Параллельных Линий

Б. Е. Машрапов,

М. Я. Клецель,

Р. М. Машрапова

2024

BTOUEn

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Отмечено, что построение защит без использования традиционных трансформаторов тока до сих пор остается одной из актуальных задач современной электроэнергетики. Приведены известные предложения по построению таких защит на различных магниточувствительных элементах. Рассмотрен принцип действия защиты двух параллельных линий, использующей в качестве датчиков тока магнитоуправляемые контакты – герконы. Обосновано, почему для получения информации о токах в фазах линий выбраны именно герконы, а не другие магниточувствительные элементы. Приведены методики проведения экспериментов по исследованию времени между срабатываниями герконов, а также их помехоустойчивости к переменным магнитным полям разной частоты. Представлена лабораторная установка для проведения этих экспериментов. Даны экспериментально полученные зависимости интервалов времени с момента перехода синусоиды магнитной индукции через ноль до момента срабатывания герконов от ее кратности к индукции срабатывания. Даны экспериментально полученные зависимости индукции переменного магнитного поля помехи, действующей вдоль оси геркона, от максимальной частоты при которой он не срабатывает. Показано, что частота поля помехи, при которой геркон не замыкает контакты, зависит от его времени срабатывания. Ключевые слова: защита, геркон, время между срабатываниями, помехоустойчивость, частота, время срабатывания.

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Self-calibration method for coreless Hall effect current transformer

Cited by 10 publications

References 7 publications

Determination of the magnitude of short-circuit surge current for the construction of relay protection on reed switches and microprocessors

Determination of the magnitude of short-circuit surge current for the construction of relay protection on reed switches and microprocessors

Wire-positioning algorithm for coreless Hall array sensors in current measurement

Исследование Времени Между Срабатываниями Герконов И Их Помехоустойчивости Для Построения Защит Параллельных Линий

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