№ 14 (ЕСБЗТ)

Permanent URI for this collection

http://crust.ust.edu.ua/handle/123456789/10675

Browse

Browsing № 14 (ЕСБЗТ) by Author "Havryliuk, Volodymyr I."

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Experimental Determination of Basic Data for Probabilistic Research of Electrical Tonal Track Circuit
    (Дніпропетровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2017) Romantsev, Ivan O.; Havryliuk, Volodymyr I.
    EN: Purpose. Determination of mathematical model with the probabilistic parameters of tonal-frequency railway circuit, leadthrough of the concomitant measurings and their analysis, forming of maximum sizes of the probabilistic states of object. Methodology. At research of the probabilistic states of railway circuit the terms of measurings of probabilistic descriptions, parameters of transformations of frequency-temporal descriptions of signals are certain, the statistical results of the conducted measurings are analyzed, the table of the probabilistic diagnostic is formed, and the probabilistic scopes of diagnostic of the states of tonal-frequency railway circuit are got. Findings. Determination of scopes of premature exit from working condition state of tonal-frequency railway circuit. Originality. Principle of determination of statistical information is presented for the system of the probabilistic diagnosticating of tonal-frequency railway circuit, laws of distributing of parameters and finding of premature exit state and maximum scopes of electric parameters. Practical value. Findings enable to form the system of the probabilistic diagnosticating of tonal-frequency railway circuit.
  • Thumbnail Image
    Item
    A Review of Power Quality Issues in Electrified Rails
    (Дніпропетровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2017) Havryliuk, Volodymyr I.
    EN: Electrified railways are among of the largest consumers of electric energy with longitudinally distributed power supply stations and connected to lines fixed (unmovable) electrical loads (consumers) and moving loads (vehicles), which operate, in general case, in nonlinear pulse modes. Due to the electrical non-linear nature of power stations and loads, current and voltage distortions appear in railway lines that devastating impact on the entire power system and consumers. The development of high-speed railways and the use of new types of rolling stock with power electrical equipment and pulse-width modulation of the traction current lead to problems with electromagnetic compatibility (EMC) and power quality in feeding grids that can adversely influence on train movement safety. The purpose of this article is to give a brief overview of power quality issues in electrified railways and also to consider related PQ standards. The main power quality disturbances are illustrated by using fragments of the traction current and voltage time-dependences measured during tests of the rolling stocks on electromagnetic compatibility with rail circuits. The traction current and voltage were registered in vehicle power equipment circuits, using a current and voltage probes whose signals were converted by analog-to-digital converter and recorded by PC. The different definitions of power quality presented in standards and literature are discussed.The main power quality disturbances were illustrated using specially chosen characteristic fragments of registered traction current, and some their parameters and electrical processes caused them are considered.