Low Cost Procedure for Frequency Characterization of Voltage Instrument Transformers

Letizia, Palma Sara; Crotti, G.; Giordano, D.; Femine, Antonio Delle; Gallo, Daniele; Landi, C.; Luiso, Mario

doi:10.1109/i2mtc.2019.8827018

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…Hence, the measurements are carried out at low voltage levels rather than at the IVT rated voltage level. In [15,[20][21][22], a LV sinusoidal frequency response based compensation technique known as SINDICOMP is used for IVT harmonic measurement error correction. The presented results show the successful implementation of this method for harmonic measurement error correction at lower order harmonic frequencies below the first resonance frequency point of the IVT.…”

Section: ) Ivt Frequency Response Models That Utilize Low Voltage Sin...mentioning

confidence: 99%

See 1 more Smart Citation

Measurement Based Linear and Nonlinear Time Invariant Representations for High Voltage Inductive Transformer Frequency Response up to 10 kHz

Dewayalage,

Robinson,

Elphick

et al. 2024

IEEE Access

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This paper presents the details of the development, evaluation process, and results of linear and nonlinear time-invariant models used to represent the frequency response of inductive high-voltage instrument transformers. The study encompasses both sinusoidal and distorted quasi-sinusoidal test waveform conditions, focusing on harmonic voltage amplitude and phase-angle measurements up to 10 kHz. A linear time-invariant model was derived using a higher-order transfer-function estimation technique that minimized the least-squares error between the measured frequency response of the transformer and the estimated transfer function across harmonic orders ranging from 50 Hz to 10 kHz. Acknowledging the limited validity of the linear time-invariant model under multi-tone distorted waveform conditions, a nonlinear timeinvariant model employing a simplified Volterra series was introduced to represent the instrument transformer frequency response under multi-tone distorted waveform scenarios. The accuracy of both models was rigorously assessed using the experimental frequency responses obtained through sinusoidal lowvoltage-frequency sweep signals and multi-tone-distorted high-voltage waveforms. This study contributes to a comprehensive understanding of the behaviour of instrument transformers at high frequencies under different input voltage conditions, providing valuable insights into the accuracy of high-frequency harmonic measurements up to 10 kHz.INDEX TERMS Frequency domain analysis, frequency response, high-voltage techniques, instrument transformers, nonlinear systems, power quality, power system harmonics, transfer functions.

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Section: ) Ivt Frequency Response Models That Utilize Low Voltage Sin...mentioning

confidence: 99%

“…By considering a 2 nd order approximated Volterra model, the representation shown in ( 15) can be expressed in matrix format according to (19). This representation can be extended to any nonlinear order without the loss of generality, as shown in (20).…”

Section: ) Simplification Of Volterra Series Under Quasi-sinusoidal I...mentioning

confidence: 99%

Measurement Based Linear and Nonlinear Time Invariant Representations for High Voltage Inductive Transformer Frequency Response up to 10 kHz

Dewayalage,

Robinson,

Elphick

et al. 2024

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Therefore, this procedure saves time and is consequently cost-effective compared to other methods, such as frequency sweep or impulse response, which can be time-consuming and technically complex, respectively. It is well known that the characterization of ITs has been addressed by several researchers [ 16 , 17 ] and is partially described in the relevant standards. Specifically, IEC 61869 is fully dedicated to ITs.…”

Section: Introductionmentioning

confidence: 99%

Validation of a Simplified Method for Estimating the Harmonic Response of Rogowski Coils with the Monte Carlo Method

Betti,

Mingotti,

Tinarelli

et al. 2024

Sensors

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The need to monitor the power network is leading to a significant increase in the number of measurement points. These points consist of intelligent electronic devices and instrument transformers (or more in general sensors). However, as the number of devices increases, so does the demand for their characterization and testing. To this end, the authors formulated a new characterization procedure that offers numerous benefits for manufacturers and system operators. These benefits include: (i) reducing testing time (thus lowering costs), (ii) simplifying the existing procedures, and (iii) increasing the number of tested devices. In this study, to complete the validation of the proposed characterization procedure, the authors performed a comprehensive uncertainty evaluation. This included the identification and analysis of the uncertainty sources, the implementation of the Monte Carlo method to obtain the statistical parameters of the quantities of interest, and the final method assessment according to the obtained results. Each step is described in detail, and the results allow one to (i) replicate the uncertainty analysis on other types of instrument transformers and (ii) implement the proposed harmonic characterization procedure with the confidence that the method is accurate, flexible, and scalable.

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“…To the authors’ knowledge, the LV solution for the characterization of LPITs was only addressed in [ 21 , 22 ]. In the former study, authors introduced and described a low-cost and versatile acquisition system which can be used for a variety of ITs.…”

Section: Introductionmentioning

confidence: 99%

Simplified and Low-Cost Characterization of Medium-Voltage Low-Power Voltage Transformers in the Power Quality Frequency Range

Mingotti

Betti

Peretto

et al. 2022

Sensors

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The distribution network is experiencing a massive deployment of intelligent electronic devices (IEDs) such as energy meters, protective devices, and phasor measurement units (PMUs). This phenomenon resulted, on the one hand, in (i) the availability of distributed measurement systems capable of monitoring and collecting measurements from the distribution network, and (ii) increasing awareness of the system operator about the status of the network. On the other hand, such a significant number of devices require to be characterized, over the years, and assessed in both sinusoidal and distorted conditions. However, the characterization process may require a huge investment of money and time considering the low availability of reference instruments and accredited laboratories. To this purpose, this paper presents a simple and fast test procedure, performed with cheap and low-voltage instrumentation, to characterize two off-the-shelf low-power medium-voltage sensors in the power quality frequency range. In detail, the paper describes the measurement setup developed for the characterization and the performed tests. In addition, the method was also reproduced with reference equipment for validation purposes. Lastly, for both tests, an uncertainty evaluation was performed to quantify the goodness of the proposed method. From the results, it is possible to appreciate that the designed cheap and simple test can achieve as accurate results as those of a sophisticated and expensive equipment.

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Low Cost Procedure for Frequency Characterization of Voltage Instrument Transformers

Cited by 10 publications

References 26 publications

Measurement Based Linear and Nonlinear Time Invariant Representations for High Voltage Inductive Transformer Frequency Response up to 10 kHz

Measurement Based Linear and Nonlinear Time Invariant Representations for High Voltage Inductive Transformer Frequency Response up to 10 kHz

Validation of a Simplified Method for Estimating the Harmonic Response of Rogowski Coils with the Monte Carlo Method

Simplified and Low-Cost Characterization of Medium-Voltage Low-Power Voltage Transformers in the Power Quality Frequency Range

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