Low-Power Voltage Transformer Smart Frequency Modeling and Output Prediction up to 2.5 kHz, Using Sinc-Response Approach

Ghaderi, Abbas; Mingotti, Alessandro; Peretto, Lorenzo; Tinarelli, Roberto

doi:10.3390/s20174889

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…For example, models for ITs, and, in particular, for CTs and voltage transformers (VTs), are developed in [ 33 , 34 , 35 ] respectively. As for LPITs, they have been modeled in [ 36 , 37 ] for LPVTs and Rogowski coils, respectively.…”

Section: Importance Of Testingmentioning

confidence: 99%

Accuracy Type Test for Rogowski Coils Subjected to Distorted Signals, Temperature, Humidity, and Position Variations

Mingotti

Costa

Peretto

et al. 2022

Sensors

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Low-Power Instrument Transformers (LPITs) are becoming the first choice for distributed measurement systems for medium voltage networks. However, there are still a lot of challenges related to their operation. Such challenges include their accuracy variation when several influence quantities are acting on them. Among the most significant influence quantities are temperature, electromagnetic field, humidity, etc. Another aspect that increases the importance of studying the LPITs’ accuracy behavior is that, once installed, they cannot be calibrated for several years; hence, one cannot compensate for in-field conditions. Hence, this work aims at introducing a simple type test for a specific LPIT, the Rogowski coil. First, an experimental setup to assess the effect of temperature, humidity, and positioning on the power quality accuracy performance of the Rogowski coil is described. Second, from the results and the experience of the authors it has been possible to design a specific type test. The test has the aim of finding the limits of the accuracy variations of a single Rogowski coil. Afterwards, such limits can be used to compensate for the in-field measurements, obtaining an overall higher accuracy. The results of this work may contribute to the always-evolving standardization work on LPITs.

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Section: Importance Of Testingmentioning

confidence: 99%

Accuracy Type Test for Rogowski Coils Subjected to Distorted Signals, Temperature, Humidity, and Position Variations

Mingotti

Costa

Peretto

et al. 2022

Sensors

Self Cite

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show abstract

“…In general, great differences in terms of frequency performance can be found between conventional inductive ITs and non-inductive Low Power Instrument Transformers (LPITs). The latter are usually characterized by a flat frequency response [25], [26] whereas inductive ITs (especially IVTs) have worse frequency behavior and show distinctive resonance points (because of the stray capacitances), which decrease in frequency with increasing rated primary voltage [16]. However, inductive ITs already installed in MV for metering and protection purposes are often used also for harmonic and, more generally, PQ measurements.…”

Section: B Verification Of It Performance In Pq Measurementsmentioning

confidence: 99%

Instrument Transformers for Power Quality Measurements: a Review of Literature and Standards

Crotti

D’Avanzo

Landi

et al. 2021

2021 IEEE 11th International Workshop on Applied Measurements for Power Systems (AMPS)

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Measurements of Power Quality (PQ) are gaining more importance due to increasing presence of switching power converters that deform the waveform of the distributed voltage further and further away from a sine wave. Especially at medium and high voltage levels, PQ measurements are carried out by means of Instrument Transformers (ITs). A recently started European metrology project, EMPIR 19NRM05 IT4PQ, aims at establishing the methods and procedures for assessing the accuracy of ITs used for PQ measurements. This paper, that is written in the framework of the IT4PQ project, presents a thorough review of the current state-of-the-art of literature and international standards about ITs and PQ. The main results from several papers and the main information from IT and PQ related international standards are summarized.

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“…The secondary rated voltage of the voltage sensor (3.25 V and this voltage divided by √ 3) is lower than the inductive voltage transformer (100-110-115-120-200-230 V and these voltages divided by √ 3). Therefore, considering distributed networks, voltage sensors are preferred in smart grids (Ghaderi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Low Power Electronic Voltage Transformer Design and Construction

KILINÇ,

BOZ

2023

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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The use of advanced low-power sensing technologies instead of traditional solutions used in the distribution, measurement and control of the power grid has introduced core instrument transformers due to their physical limitations and other reasons. This situation has also brought about the design of low-power voltage transformers. As can be understood from here, analogue measurement and control systems used in power centres are approaching the end of their useful life. This substations need digital automation solutions and new technologies for more efficient performance. Since no iron core is used in the low-power electronic voltage transformer structure, it is robust against network disturbances such as ferroresonance and ferroresonance formation is not encountered. In this study, a low-power electronic voltage transformer is designed and performed experiments are presented. The most essential feature expected in a voltage sensor is that the conversion rate is precise and unchanging. For this reason, the temperature coefficient and leakage capacitance values of the voltage sensor have been designed to have the lowest margin of error. Performance tests were applied to the voltage sensor using mains frequency endurance, partial discharge, accuracy class, linearity and temperature distribution tests. The results of the performance tests show that it has been successfully applied for the design of a precision voltage sensor with an accuracy class conforming to the IEC 61689-11 standard.

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Low-Power Voltage Transformer Smart Frequency Modeling and Output Prediction up to 2.5 kHz, Using Sinc-Response Approach

Cited by 8 publications

References 27 publications

Accuracy Type Test for Rogowski Coils Subjected to Distorted Signals, Temperature, Humidity, and Position Variations

Accuracy Type Test for Rogowski Coils Subjected to Distorted Signals, Temperature, Humidity, and Position Variations

Instrument Transformers for Power Quality Measurements: a Review of Literature and Standards

Low Power Electronic Voltage Transformer Design and Construction

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