Testing and modelling of voltage transformer for high order harmonic measurement

Zhao, Sicheng; Li, H. Y.; Crossley, P.A.; Ghassemi, F.

doi:10.1109/drpt.2011.5993894

Cited by 15 publications

(7 citation statements)

References 9 publications

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“…The most common model that takes into account the stray capacitances among the active elements of the transformers is provided e.g. in [17]. Following this approach, the authors adopt the model shown in Figure 7.…”

Section: Circuital Modelmentioning

confidence: 99%

Stray Parameter Evaluation of Voltage Transformers for PQ Measurement in MV Applications

Giordano

Crotti

Letizia

et al. 2022

2022 20th International Conference on Harmonics &Amp; Quality of Power (ICHQP)

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Power Quality (PQ) monitoring is one of the key tasks in modern power systems. In transmission and distribution grids, PQ phenomena are often measured by inductive Voltage Transformers (VTs) installed for metering and/or protection applications. VTs accuracy requirements should be ideally met under actual operating conditions, which can differ from the calibration ones, in particular for the presence of environmental or circuital influence factors. The impact of such influence factors on the VT performance in PQ measurements is an open issue, not fully addressed in the literature. In this respect, this paper presents a simplified numerical-experimental model of inductive MV VTs, which can be used for the analysis of VT wideband behaviour in PQ applications, also in presence of one or more influence factors. The results provided by the model are experimentally validated and future applications are discussed.

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Section: Circuital Modelmentioning

confidence: 99%

Stray Parameter Evaluation of Voltage Transformers for PQ Measurement in MV Applications

Giordano

Crotti

Letizia

et al. 2022

2022 20th International Conference on Harmonics &Amp; Quality of Power (ICHQP)

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“…In previous publications, such as in [5], voltage transformers have often been modeled by using the well-known transformer equivalent circuit, which is extended with some capacitances. This simulation has almost no practical relation to the design of a voltage transformer, as it is virtually impossible to assign geometrical values to the elements of the equivalent circuit for a calculation without measuring them.…”

Section: Layer Based Equivalent Circuitmentioning

confidence: 99%

Calculation of the frequency response of inductive medium voltage transformers

Buchhagen

Reese

Hofmann

et al. 2012

2012 IEEE International Energy Conference and Exhibition (ENERGYCON)

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“…For each primary test signal, the corresponding secondary voltage spectrum predicted by the model can be used as in (7). Considering a spectral component, the TVE has been evaluated for all the test signals, and its 95 th percentile has been computed.…”

Section: B Model Validationmentioning

confidence: 99%

“…Rated measurement performance of conventional inductive power transformers, summarized by their accuracy class, is guaranteed only at the nominal frequency [2]. Furthermore, in many works the frequency response function of instrument transformers is measured [3]- [7], thus neglecting nonlinearities.…”

Section: Introductionmentioning

confidence: 99%

Overcoming Frequency Response Measurements of Voltage Transformers: An Approach Based on Quasi-Sinusoidal Volterra Models

Faifer

Laurano

Ottoboni

et al. 2019

IEEE Trans. Instrum. Meas.

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The most recent IEC standards about voltage transformers warn about nonlinearity, which may have significantly impact on the harmonic measurement performance. However, there is a lack of scientific literature about this topic: usually their characterization consists of frequency response measurements, which are clearly not able to capture the nonlinear behavior.In this paper, an innovative approach based on simplified frequency domain polynomial models developed by the authors is proposed. The method is applied to two different medium voltage inductive transformers. Models are identified and validated with a large set of realistic primary waveforms injected by a proper setup. Experimental results confirm the remarkable accuracy of the proposed models especially for low-order harmonics, which are the most affected by nonlinearity.

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Testing and modelling of voltage transformer for high order harmonic measurement

Cited by 15 publications

References 9 publications

Stray Parameter Evaluation of Voltage Transformers for PQ Measurement in MV Applications

Stray Parameter Evaluation of Voltage Transformers for PQ Measurement in MV Applications

Calculation of the frequency response of inductive medium voltage transformers

Overcoming Frequency Response Measurements of Voltage Transformers: An Approach Based on Quasi-Sinusoidal Volterra Models

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