Open AccessThe method of power transformers and autotransformers windings condition determination
Author(s) -
Elmira Gayfutdinova,
V M Bulatova,
A R Ilkevich
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/791/1/012028
Subject(s) - autotransformer , electromagnetic coil , transformer , linear variable differential transformer , amplitude , delta wye transformer , rotary variable differential transformer , electrical engineering , isolation transformer , engineering , acoustics , distribution transformer , electronic engineering , voltage , physics , quantum mechanics
In article advantages and shortcomings of a method of the frequency analysis of a condition of windings of transformers are considered. This control method of a condition of windings of the transformer is based on comparison of the amplitude-frequency characteristics (AFC) of the diagnosed transformer with its amplitude-frequency characteristics in good repair. It is reported that in various frequency ranges it is possible to find manifestations of various defects and bruises of windings of power transformers and autotransformers. Using a pulse frequency analysis method, the amplitude frequency response spectrum is examined in frequency ranges from zero to 2 MHz. Types and places of defects of transformer winding are determined from value and direction of frequency offset of amplitude-frequency characteristic lines. Such types of defects can include changes in the state of windings, violations of the pressing mechanism, displacement of winding turns relative to each other. In order to determine the type and magnitude of the defect, this method creates a mathematical model of the transformer. An important task in the simulation of transformer windings is the connection between strain types and transformer elements.