Modeling of converter transformers using frequency domain terminal impedance measurements

Liu, Y.; Sebo, S.A.; Caldecott, R.; Kasten, D.G.; Wright, Sue Ellen

doi:10.1109/61.180320

Cited by 29 publications

(9 citation statements)

References 9 publications

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“…12. In the literature [8], the calculation method of each branch parameter of NIF topology is described in detail. Table 1 gives the admittance of each branch of 'N1', 'N2' and 'N3' NIF topology respectively.…”

Section: Advances In Engineering Research Volume 134mentioning

confidence: 99%

“…However, such a port condition seems too simple and it causes some inconvenience of researching the two-port basic theory. According to previous studies [8][9][10], a brand new modeling method named nod-to-nod impedance function (NIF) for multi-terminal networks had been proposed. In this paper, the NIF topology is applied to study of passive and linear timeinvariant two-port network.…”

Section: Introductionmentioning

confidence: 99%

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Research on the two-port network based on the NIF

Zheng¹,

Lan²

2018

Proceedings of the International Symposium on Mechanical Engineering and Material Science (ISMEMS 2017)

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Abstract-The theory of two-port network is an important aspect both of electrical or electronics, in the past, researches of two-port network are mostly about port characteristics, parametric equation or the equivalent circuit derived from the equation parameters. In this paper,an equivalent topology for the multi-terminal network--NIF is introduced, and then derived the establishment condition of two-port network. Issues such as interconnection of two-port networks has been discussed. It proves that the NIF topology has a strong applicability to the two-port network theory. The conclusion of this paper enriches the theory of two-port networks.

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Section: Advances In Engineering Research Volume 134mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the two-port network based on the NIF

Zheng¹,

Lan²

2018

Proceedings of the International Symposium on Mechanical Engineering and Material Science (ISMEMS 2017)

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“…In this case, the black-box modelling method is a good choice. As a powerful wide-band modelling method, the black-box modelling method [4][5][6] is based on the wide-band measurements [7,8]. Therefore, an accurate measurement is the prerequisite for the modelling.…”

Section: Introductionmentioning

confidence: 99%

A novel compensation method for impedance measurement when long feeders are involved

Liu

Feng

2021

IET Science Measure & Tech

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Black-box modelling for the electrical equipment requires accurate admittance/impedance frequency-sweep measurements. In some cases, long test leads are required because of the large size of the electrical equipment under test. It would induce unacceptable measurement errors in high frequency band. In order to solve this problem, first, the measurement principle of the impedance analyzer is studied, based on which the factors affecting the measurement accuracy are fully discussed. Second, a novel compensation method for measuring the wide-band impedance of the large electrical equipment is proposed, in which the long test leads effect and the non-standard characteristics caused by the extra leads connected to the open/short/50Ω-load compensation terminals can both be eliminated. Finally, this method is validated by some experiments with 30 m-long test leads in a frequency band ranging from 40 Hz to 10 MHz.

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“…It is of great theoretical significance and practical value to set up an accurately broadband model. There are several kinds of potential transformer models in use since decades [3][4][5][6][7][8][9]. In general, there are three ways of device modeling.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Model of a Potential Transformer

Liang¹,

Liu²,

Zhang³

et al. 2014

TOMEJ

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In this paper, a broadband circuit model of a potential transformer (PT) based on fractional calculus and circuit augmentation method was proposed to improve the high frequency characteristic while providing physical significance of the existing traditional equivalent circuit model with simple structure. In order to comprehensively reflect on the characteristics of hysteresis of the iron core , a fractional model of the magnetic hysteresis loop in iron core measured by a no-load experiment was set up instead of the single-value magnetization curve of previous model. Besides, the original equivalent circuit model was calculated at low frequencies, and the circuit augmentation method (CAM) was employed to extend the compatibility of the original equivalent circuit model in the wide range of frequency. The element values were calculated by the Brune method of synthesis. For validity, comparisons between the simulation and experiment of a 10 kV single-phase oil-immersed PT with lightning overvoltage and switching overvoltage were conducted, respectively. The results showed that the broadband model presented in the paper had good accuracy while reserving the physical significance of original equivalent circuit model.

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Modeling of converter transformers using frequency domain terminal impedance measurements

Cited by 29 publications

References 9 publications

Research on the two-port network based on the NIF

Research on the two-port network based on the NIF

A novel compensation method for impedance measurement when long feeders are involved

A Broadband Model of a Potential Transformer

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