Influence of High Voltage DC Transmission on Measuring Accuracy of Current Transformers

Yang, Shihai; Zhou, Gan; Wei, Zhinong

doi:10.1109/access.2018.2874624

Cited by 14 publications

(3 citation statements)

References 11 publications

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“…(iii) The k+1 th voltage compensation can be obtained by adding the compensation voltage to the original AC and DC voltage source, as shown in (9).…”

Section: B Series Resistance and Voltage Compensation Methods (Srvcm)mentioning

confidence: 99%

“…HVDC transmission [6], nonlinear loads such as AC drives, switch-mode power supplies and grid-connected converters, which can cause, the generation of unwanted current harmonics and a DC current component injection into the grid [7], and geomagnetically induced current (GIC) caused by solar magnetic storms, which could attain up to 100 A per phase for 1 min and 50 A per phase for 5 min during the most severe magnetic storm [8]. The main effect of a DC current flowing into a transformer windings is the asymmetric magnetic core saturation during a sinusoidal half-period (half-cycle saturation), as a result, a series of problems occur, such as the serious distortion of excitation current, increased reactive power absorption, partial overheating and increase of vibration and noise [4], [9]- [14]. Thus, precise and in-depth analysis of DC bias for UHV autotransformers is necessary for the safe operation of equipment and transmission systems.…”

Section: Introductionmentioning

confidence: 99%

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No Load Simulation and Downscaled Experiment of UHV Single-Phase Autotransformer Under DC Bias

Wang

Guo

et al. 2020

IEEE Access

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The time-domain field-circuit coupled finite element method (FEM) is widely used to analyze the DC effects on transformers. However, the long transient process of calculation will encounter difficulties due to the tremendous requirement of computer memory and CPU time, especially when it comes to ultrahigh-voltage (UHV) autotransformers, which has a large time constant due to their less resistance and larger inductance. Besides, compared to the AC voltage, the DC voltage is much smaller, miscalculations usually occur as the component of DC bias can be easily neglected in the simulation. In this paper, a time-domain field-circuit coupling FEM combined with the series resistance and voltage compensation method (SRVCM) is proposed, a large resistance is in series in the circuit model to speed up the convergence of transient process and amplify DC component. Afterwards, the voltage supply is increased to compensate for the reduced voltage drop due to series resistance. The excitation waveform and its frequency characteristics of UHV autotransformer under various DC bias are discussed under no-load condition. Its advantages over conventional decrease the numerical miscalculation and the iterations calculation of the transient process. An experimental verification of the proposed method is carried out by a downscaled autotransformer. INDEX TERMS UHV autotransformer, DC bias, field-circuit coupling finite element method, series resistance and voltage compensation method, downscaled experiment.

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“…(iii) The k+1 th voltage compensation can be obtained by adding the compensation voltage to the original AC and DC voltage source, as shown in (9).…”

Section: B Series Resistance and Voltage Compensation Methods (Srvcm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

No Load Simulation and Downscaled Experiment of UHV Single-Phase Autotransformer Under DC Bias

Wang

Guo

et al. 2020

IEEE Access

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“…Even if the measured current is at powerline frequency, it often contains a DC component and higher harmonics. The DC component can be of geomagnetic origin [4], induced from DC power lines [5], or injected from transformerless inverters [6]. Higher harmonics usually come from inverters and from other power electronic devices.…”

Section: Introductionmentioning

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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Field Experiment and Modelling of DC Electronic Current Transformer with Digital Output

Cao,

Tang,

Zhu

et al. 2024

Lecture Notes in Electrical Engineering

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Influence of High Voltage DC Transmission on Measuring Accuracy of Current Transformers

Cited by 14 publications

References 11 publications

No Load Simulation and Downscaled Experiment of UHV Single-Phase Autotransformer Under DC Bias

No Load Simulation and Downscaled Experiment of UHV Single-Phase Autotransformer Under DC Bias

Contactless measurement of electric current using magnetic sensors

Field Experiment and Modelling of DC Electronic Current Transformer with Digital Output

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