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Dielectric response of paper-oil insulation of power transformers

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Subocz J. , Gielniak J. , Ossowski M. , Walczak K.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

2004

tom Vol. 40, nr 15

102-105

Recently diagnostic techniques using measurements in time and low frequency domain are very intensive developed. There are used various methods (RVM, FDS, PDC), which allow to evaluate the moisture content of paper insulation or its degradation degree. However up to now in the most cases the interpretation of measurement results is ambiguous. The paper presents field measurement results of different operating time power transformers. The measurement of power transformers were taken using three methods: RVM, FDS, PDC. Analysis of dielectric dispersion in time and frequency domain was also presented. Then the analysis results were compared. It was obtained, that the calculated relaxation time of primary relaxation structure for both measurements in time and frequency domain was the same.

A general probabilistic approach to the universal relaxation response of complex systems

100%

Jurlewicz A. , Weron K.

Cellular and Molecular Biology Letters

1999

tom 04

nr 1

A new probabilistic representation of the multichannel relaxation mechanism, which generates the universal two power-law relaxation response with the stretched exponential and the classical exponential decays as special cases, is presented. The consideration of irreversible stochastic transitions of complex systems is based on a general probabilistic formalism applied to the analysis of the first passage of a system. By means of limit theorems the origins of the universality of relaxation responses are indicated. This approach, without referring to the conventional stochastic transition description, allows us to derive explicitly the intensity of transition from an initial state for a complex system in the most general case of parallel channel relaxation with a random number of transition channels, each characterized by an individual relaxation rate. The nonexponential relaxation is shown to result from general properties of transition channels only, namely, from the asymptotical self-similar behavior of their relaxation rate distributions. For the reader’s convenience a survey of limit theorems of probability theory is included in the Appendix.