Design of the instrument current transformer for high frequency high power applications

Makky, A.-R.A.M.; Abo-Zied, Hammad; Abdelbar, F.N.; Mutschler, P.

doi:10.1109/mepcon.2008.4562343

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…Two comments are needed before moving on with the discussion. First, from the ideal representation of the CD presented in Figure 1 , it might seem strange to deepen the discussion on the behavior vs. frequency of the CD (like it is crucial for other ITs [ 52 , 53 , 54 , 55 ]). In fact, from Figure 1 and from the left side of Equation (3), it is clear that the divider behavior is not affected by frequency changes.…”

Section: Low-power Voltage Transformers: Capacitive Dividersmentioning

confidence: 99%

Modeling Capacitive Low-Power Voltage Transformer Behavior over Temperature and Frequency

Mingotti

Costa

Pasini

et al. 2021

Sensors

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The use of capacitive dividers (CDs) in medium-voltage (MV) networks started as simple voltage detectors and as rough voltage measurement instruments for protective purposes. Now, with the spread of intelligent electronic devices and renewable energy sources at the distribution level, capacitive dividers are designed and installed to perform accurate voltage measurements. Such a requirement is mandatory when the power quality has to be assessed. Therefore, CDs are currently being used either for power frequency or for high-frequency (supraharmonic- or partial-discharge-level) measurements. In this paper, typical off-the-shelf CDs are studied and modeled to understand how they behave in a wide range of frequencies and when the temperature varies. To this purpose, specific setups and tests have been developed and performed. From the results, it is clear that with proper modeling of CDs, it is possible to exploit them for measuring phenomena in a wide range of frequencies, including the effects due to temperature variations and self-resonances.

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Section: Low-power Voltage Transformers: Capacitive Dividersmentioning

confidence: 99%

Modeling Capacitive Low-Power Voltage Transformer Behavior over Temperature and Frequency

Mingotti

Costa

Pasini

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…Providing a galvanic isolation, low power losses, operation at a high bandwidth, and sufficient voltage levels for output are the other advantages of CTs [3]. Thus, CTs are broadly used in many applications such as detecting and measuring the current or driving switches based on the current signal [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effects of a current transformer''s magnetizing current on the driving voltage in self-oscillating converters

Bal¹,

Öncü²

2014

Turk J Elec Eng & Comp Sci

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Abstract:Magnetizing inductance is one of the parameters that affect the phase and amplitude error of the output current of current transformers (CTs). In this study, the linear circuit model of a CT is developed to be used for driving purposes in power electronics applications. A simulation of the CT and its linear model is achieved. In the model circuit, the effect of the magnetizing inductance on the driving voltage can be examined. The equivalent circuit simulation results and the linear model simulation results along with the calculated results show agreement with each other. These results are compared with experimental results.

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“…CTs are extremely versatile instruments especially fit for the measurement of timevarying currents that flow in a single-conductor (primary); for best coupling results, the secondary winding should be evenly spaced completely around the core, the latter having usually a toroidal shape. High permeability and low core loss materials (ferrite) is recommended to reduce errors due to leakage flux and magnetizing currents, [1]. The utilization of nonmagnetic cores is an obvious strategy to avoid eddy current losses, saturation and hysteresis problems.…”

Section: Introductionmentioning

confidence: 99%

“…A significant amount of scientific and technical literature has been published, [1]- [15], related to CT transient performance, high frequency high power applications, severe nonlinearities and saturation conditions, hysteresis effects, electronic compensation, and also CT metrological methods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Mutual Inductance in Current Transformers Taking Primary Conductors Eccentricity Into Account

2011

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In this work a current transformer (CT) with toroidal core is analyzed from the viewpoint of the eccentricity of the primary circuit where one conductor goes through the core's window and the other is outside the core. The research is focused on the influence of the position of the primary circuit conductors on the evaluation of the mutual inductance between the primary circuit and the secondary winding-an influential factor on the CT's amplitude error. Purely analytical results and closed-form expressions for the mutual inductance are obtained when the core is made of a nonmagnetic material. A finite-element method is also utilized for the numerical computation of the mutual inductance, for nonmagnetic and ferromagnetic cores. Results are cross-validated using both methods. Results are presented and discussed taking into account the system geometry and the number of turns of the secondary winding. This novel contribution shows that the response of nonmagnetic-core current transformers can be significantly affected by the positional eccentricity of the primary circuit, especially when the secondary winding does not possess a large number of turns.Index Terms-Current transformer, finite-element method, magnetic field, mutual inductance, toroidal core.

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Design of the instrument current transformer for high frequency high power applications

Cited by 12 publications

References 3 publications

Modeling Capacitive Low-Power Voltage Transformer Behavior over Temperature and Frequency

Modeling Capacitive Low-Power Voltage Transformer Behavior over Temperature and Frequency

Effects of a current transformer''s magnetizing current on the driving voltage in self-oscillating converters

Analysis of the Mutual Inductance in Current Transformers Taking Primary Conductors Eccentricity Into Account

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