Application of the Field-Circuit Method for the Computation of Measurement Properties of Current Transformers With Cores Consisting of Different Magnetic Materials

Leśniewska, E.; Rajchert, R.

doi:10.1109/tmag.2010.2050068

Cited by 32 publications

(24 citation statements)

References 8 publications

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“…The mesh for the 3D model resulted from the accuracy analysis (Lesniewska, 2012;Lesniewska and Rajchert, 2010;Lesniewska and Tulodziecki, 2012).…”

Section: Influence Of External Fieldmentioning

confidence: 99%

Immunity of current-to-voltage transducer, with coils manufactured by means of multilayered PCB technology, to external magnetic fields

Leśniewska

2015

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose – The purpose of this paper is to discuss the operation of new generation electromagnetic current-to-voltage transducer. The aim of research was analysis of behaviour of considered current-to-voltage transducers during operation. The main problem was to estimate whether the external fields are able to change the value of the secondary voltage and that the replacement of the casing material by a conductive or ferromagnetic material will increase the immunity of the transducer to external magnetic fields. The immunity of current-to-voltage transducers to the external fields is very important because it influences the proper functioning of the protection system. Design/methodology/approach – The use of analytical methods to assess the influence of external fields was impossible due to the complexity of the geometry. The 3D computations were necessary because of different cross sections of circuit boards at different heights. Therefore the numerical 3D field-and-circuit method based on finite element method was applied. The wide range of dimensions in computation system, ranging from 0.15 mm (print paths) to 0.22 m, made it necessary to use the mesh of millions of elements. The division of this type of system into elements requires a diverse and extremely dense mesh in the area of printed circuits board (PCBs). Findings – The 3D analysis of magnetic field distribution was performed for different external field effect upon a current-to-voltage transducer. The magnetic field distributions and the induced secondary voltage for several different cases were presented. As a conclusion it can be said that in this particular case the magnetic shield is most effective. The influence of external magnetic fields caused by currents passing through the other neighbouring phase bars near are insignificant for the transducer with non-magnetic core. Practical implications – Commonly used in measuring and protection systems of the transmission lines are induction instrument transformers. The instrument transformers are very precise devices and their errors are counted in tenths of a per cent, and phase displacement of signals in minutes. Especially in HV systems they are very big and their cores are heavy. Replacement of instrument transformers by the current to voltage transducers cooperating with electronic measuring systems will reduce the size and cost of devices. Originality/value – The requirements set for protective current transformers concern the transformation of currents, with high accuracy, especially at transient states. Therefore magnetic characteristics of their cores should be linear. It causes that cores are large and have some air gaps. Current-to-voltage transducers based on Rogowski coil are particularly suitable for the replacement of the protective current transformers because of their linearity. The traditional technologies used for making Rogowski coil consisted in winding a wire on a non-magnetic carcass. The development of technology has enabled the use of new technologies PCB high density interconnect in the production of Rogowski coil.

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“…The mesh for the 3D model resulted from the accuracy analysis (Lesniewska, 2012;Lesniewska and Rajchert, 2010;Lesniewska and Tulodziecki, 2012).…”

Section: Influence Of External Fieldmentioning

confidence: 99%

Immunity of current-to-voltage transducer, with coils manufactured by means of multilayered PCB technology, to external magnetic fields

Leśniewska

2015

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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“…Analysis has been carried out using the 3D field-and-circuit method (Lesniewska, 2010;Lesniewska and Rajchert, 2010). The harmonic electromagnetic field in an instrument transformer may be described using the magnetic vector potentialÃB ¼ 7 £Ã , by Helmholtz type equation:…”

Section: The Mathematical Model Of the Investigated Problemmentioning

confidence: 99%

Optimization of the magnetic circuits of the column voltage transformers using the field‐circuit method

Leśniewska

Tulodziecki²

2012

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to consider a constructional solution of the combined instrument transformer: constructed so that the voltage part is a column transformer, which means that the magnetic circuit of it is open and situated into a composite insulator. The aim of this research was to achieve optimal configuration of open magnetic circuit of the column voltage transformer. Design/methodology/approach -The authors made analyses of electromagnetic field distribution and computed the voltage error and phase displacement for many different cases of magnetic circuits of the column voltage transformers. The analyses of the electromagnetic field distribution and computations were carried out using the 3D field-circuit method based on the finite-element numerical method. The results were compared with tests of a real-life model. Findings -The result of research is the selection of the best constructional version of the column voltage transformer; the research also gives some guidelines for design and manufacture of this construction of combined transformers. Originality/value -The paper is meant for constructors of instrument transformers and presents results of research into new constructional solutions of combined transformer.

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“…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%

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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Application of the Field-Circuit Method for the Computation of Measurement Properties of Current Transformers With Cores Consisting of Different Magnetic Materials

Cited by 32 publications

References 8 publications

Immunity of current-to-voltage transducer, with coils manufactured by means of multilayered PCB technology, to external magnetic fields

Immunity of current-to-voltage transducer, with coils manufactured by means of multilayered PCB technology, to external magnetic fields

Optimization of the magnetic circuits of the column voltage transformers using the field‐circuit method

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

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