Calibration Procedure to Test the Effects of Multiple Influence Quantities on Low-Power Voltage Transformers

Mingotti, Alessandro; Peretto, Lorenzo; Tinarelli, Roberto

doi:10.3390/s20041172

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…In [ 27 ], the authors studied the calibration of direct current (DC) current transformers (CT); while in [ 28 ] it was conducted for digital ITs. A calibration procedure for legacy CTs was presented in [ 29 ], while different kinds of LPITs were calibrated in [ 30 , 31 , 32 ]. All of these works were extremely important for enhancing knowledge of ITs.…”

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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“…Measurement methods and systems for determining the transformation errors of current and voltage transformers based on various principles are described in the literature [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

3D Electromagnetic Field Analysis Applied to Evaluate the Accuracy of a Voltage Transformer under Distorted Voltage

2020

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Voltage transformers (VTs) are an important element of the measuring system that allows measuring the energy flow in medium and high voltage networks. Additional problems with the accuracy of the measurement introduced by the appearance of sources and nonlinear receivers cause deformation of the voltage shape in the energy system. Due to the high metrological requirements, the design of voltage transformers requires high accuracy (for class 0.2 ΔU ≤ 0.2, phase displacement ≤10 min), which is not possible with the use of analytical methods using approximate models. Therefore, only the application of numerical modeling by the finite element method, taking into account real three-dimensional phenomena, allows achieving high modeling accuracy. The article concerns the phenomenon of the influence of voltage higher harmonics of supply voltage on the accuracy (up to the 100th harmonic) of the measuring inductive voltage transformer (IVT). The applied modeling method takes into account the phenomena in the transformer core and the circuit equations resulting from the winding arrangement, which allows for the study of the deformation voltage transformation. Experimental tests on a real model to evaluate the method used were necessary. The article presents simulations for a model transformer, and results have been confirmed by experimental tests.

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Effects on the Accuracy Performance of Rogowski Coils Due to Temperature and Humidity

Mingotti

Costa

Peretto

et al. 2022

2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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Calibration Procedure to Test the Effects of Multiple Influence Quantities on Low-Power Voltage Transformers

Cited by 4 publications

References 32 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

3D Electromagnetic Field Analysis Applied to Evaluate the Accuracy of a Voltage Transformer under Distorted Voltage

Effects on the Accuracy Performance of Rogowski Coils Due to Temperature and Humidity

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