Frequency Response of Capacitive Voltage Dividers for Evaluation of Harmonic Components

Campos, Ana C.S.P.; Cardoso, Keyla Rezende; Cruz, Vanessa Pereira; Fortes, Márcio Zamboti

doi:10.1109/isgt-la.2019.8895310

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…Therefore, in [ 56 ], the frequency behavior of CDs in the PQ frequency range was studied. The work focused on harmonic component detection and evaluation.…”

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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“…Therefore, in [ 56 ], the frequency behavior of CDs in the PQ frequency range was studied. The work focused on harmonic component detection and evaluation.…”

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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“…Due to manufacturing procedures and imperfections, the frequency response of inductors, capacitors and resistors is never ideal [5,6]. To take into consideration this effect, the equivalent series inductance (ESL) and the equivalent series resistance (ESR) have been introduced.…”

Section: Variations Due To Parasitic Componentsmentioning

confidence: 99%

“…To take into consideration this effect, the equivalent series inductance (ESL) and the equivalent series resistance (ESR) have been introduced. ESR is used to calculate actual losses in capacitors and inductors, which are proportional to the R value while the ESL is important to consider the combination of Ls and Cs of various resonant circuits [4,5]. It has been practically demonstrated that capacitors ranging from 0.5 pF to 330 pF the ESL do not usually exceed 1 nH [4].…”

Section: Variations Due To Parasitic Componentsmentioning

confidence: 99%

“…It is well known how different parameters can affect electrical components, affecting not only their nominal value, but also increasing their degradation over time and consequently reducing their estimated lifetime [1][2][3][4]. Furthermore, frequency has a strong impact on electrical components and parasitic components can give rise to problems that were not considered in the design phase [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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A Methodology to Analyze and Evaluate the Uncertainty Propagation due to Temperature and Frequency and Design Optimization for EMC Testing Instrumentation

Bosi

Sánchez²,

Pajares³

et al. 2021

Electricity

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This paper presents a study and proposes a new methodology to analyze, evaluate and reduce the overall uncertainty of instrumentations for EMC measurements. For the scope of this work, the front end of a commercial EMI receiver is chosen and variations due to tolerances, temperature and frequency response of the system are evaluated. This paper illustrates in detail how to treat each block composing the model by analyzing each discrete component, and how to evaluate their influence on the measurand. Since a model can have hundreds or even thousands of parameters, the probability distribution functions (PDFs) of some variable might be unknown. So, a method that allows to obtain in a fast and easy way the uncertainty of the measurement despite having so many variables, to then being able to evaluate the influence of each component on the measurand, is necessary for a correct design. In this way, it will be possible to indicate which discrete components have the most influence on the measurand and thus set the maximum tolerances allowed and being able to design a cost-effective solution. Furthermore, this works presents a methodology which can easily be extended and applied to estimate and compute the uncertainty for electromagnetic interferences, energy storage systems (ESS), energy production, electric machines, electric transports and power plants in general.

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“…Consequently, studies on ITs behavior at non-rated conditions, including effects of a low PQ, are always vivid and current. In [37][38][39] effects of the harmonics and mitigation techniques have been developed for current transformers (CTs), while the same issue has been tackled in [40,41] for voltage transformers (VTs). A comparison among MV VTs, for PQ purposes has been completed in [42], while the effects of modulation on CTs has been studied in [43].…”

Section: Introductionmentioning

confidence: 99%

A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class

Mingotti

Peretto

Tinarelli

2020

Sensors

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Power quality is a wide-ranging and current topic that involves a huge effort from the scientific community. Power quality issues have to be avoided or solved in order to preserve the integrity of the network and its assets. To this purpose, several power quality indexes and measurement techniques have been developed and used by experts. This paper aims at solving the issue of having an uncertainty associated to the total harmonic distortion (THD) measurements. The idea is to obtain a close-form expression, which only requires the knowledge of the instrument transformer accuracy class, to estimate the mean value and the variance of THD. After the development of such an expression, it has been tested and stressed to confirm its effectiveness and applicability in a variety of conditions, and for harmonics up to 25th (of 50 Hz), defined by the standards.

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Frequency Response of Capacitive Voltage Dividers for Evaluation of Harmonic Components

Cited by 5 publications

References 7 publications

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

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

A Methodology to Analyze and Evaluate the Uncertainty Propagation due to Temperature and Frequency and Design Optimization for EMC Testing Instrumentation

A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class

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