Improvement of the Insulation System of Unconventional Combined Instrument Transformer Using 3-D Electric-Field Analysis

Leśniewska, E.; Olak, Jan

doi:10.1109/tpwrd.2017.2725381

Cited by 17 publications

(8 citation statements)

References 17 publications

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“…Based on this, voltages as a function of time were calculated in accordance with Formula (12), their RMS values, and then, on the basis of Equation (9), voltage errors, and phase displacement (10) at the passage of primary and secondary voltage through zero. During the testing of the real-world model, it was assumed that the primary voltage contained the first harmonic with a frequency of 50 Hz, and one higher harmonic in the frequency range of 100 Hz to 5 kHz with an effective value of 10% of the main harmonic.…”

Section: Results Of Computations and Testsmentioning

confidence: 99%

“…The differences in the measured transformation errors at different phase shifts between the first and higher harmonic were also considered ( Table 3). Based on this, voltages as a function of time were calculated in accordance with Formula (12), their RMS values, and then, on the basis of Equation 9, voltage errors, and phase displacement (10) at the passage of primary and secondary voltage through zero.…”

Section: Results Of Computations and Testsmentioning

confidence: 99%

“…The 3D finite element method was previously used by the authors in the design of electromagnetic devices such as motors [7], power transformers [8], instrument transformers [9], and other types of converters. It was used both in the design of magnetic circuits [10] and insulation [11,12], as so in steady states as in transient, when supplied with direct and sinusoidal current.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Results Of Computations and Testsmentioning

confidence: 99%

Section: Results Of Computations and Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2020

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“…Ref. [6] carried out the insulation design of the new printed-circuit board (PCB) technology medium voltage combined transformer using electric field analysis. The 3-D FEM numerical method is applied to compute the electric field distributions of the transformer to make sure that the permissible electric field strength for used materials was not exceeded in any part of the insulation system.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Modelling and Simulation of the High-voltage High-frequency Transformer Insulation Applied for Power Electronics Based on Circuit-field Coupling Analysis

Wang

Bak²,

Silva³

et al. 2022

NORD-IS

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This paper established a transient electric field model of a high-voltage high-frequency (HVHF) transformer based on circuit-field coupling analysis. As the key component of power electronic transformers (PETs), the operating conditions of the HVHF transformer are determined by the converter circuit containing it. To find out the electrical stress withstood by the solid insulation, it is essential to model the transient electric field while considering the circuit model of the converter. The circuit model of the converter and the 3-D transient electric field model based on the finite element method (FEM) are built in ANSYS. The voltage and current waveforms on both primary and secondary sides of the HVHF transformer obtained from the converter model are coupled to the transient electric model as the excitations. Based on the established model, a case study of a 60 kHz HVHF transformer used for the dual active bridge (DAB) converter is investigated, and the electric field characteristics of the insulation are analyzed. The electric field distribution inside and on the surfaces of the insulation is present, and magnitude values of the highest electrical stress inside and on the surfaces of the insulation are identified. The theoretical verification is carried out based on the grid convergence index (GCI) method and it verifies the accuracy of the proposed model. This model could be used to calculate the overvoltage capacity of the HVHF transformers in various power electronics applications and it is an essential step in building the digital twin model of the HVHF transformer.

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“…In [ 23 , 24 ], for example, the effect of moisture on ITs was studied. The behavior of ITs when subjected to an electric field was addressed in [ 25 , 26 , 27 ], while temperature as an influential factor was analyzed in [ 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

On the Long-Period Accuracy Behavior of Inductive and Low-Power Instrument Transformers

Mingotti

Bartolomei

Peretto

et al. 2020

Sensors

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The accuracy evaluation of instrument transformers is always a key task when proper control and management of the power network is required. In particular, accuracy becomes a critical aspect when the grid or the instrumentation itself is operating at conditions different from the rated ones. However, before focusing on the above non-rated conditions, it is important to fully understand the instrument transformer behavior at rated conditions. To this end, this work analyzed the accuracy behavior of legacy, inductive, and low-power voltage transformers over long periods of time. The aim was to find patterns and correlations that may be of help during the modelling or the output prediction of voltage transformers. From the results, the main differences between low-power and inductive voltage transformers were pointed out and described in detail.

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Improvement of the Insulation System of Unconventional Combined Instrument Transformer Using 3-D Electric-Field Analysis

Cited by 17 publications

References 17 publications

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

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

Electric Field Modelling and Simulation of the High-voltage High-frequency Transformer Insulation Applied for Power Electronics Based on Circuit-field Coupling Analysis

On the Long-Period Accuracy Behavior of Inductive and Low-Power Instrument Transformers

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