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With the advent of increased industrial the automation and microprocessor applications, the interest in digital motion control systems has also expanded. Hybrid Stepper Motors are widely used in open-loop position applications. This article presents a description and a functional model of a hybrid stepping motor. The motor drive methods of full stepping and back stepping are presented in this paper...
The paper deals with behavior of Czech traction power supply system of AC 25 kV. The main goal of this paper is analysis of transient effects during operation of traction vehicles in various modes which can arise during short-circuits in traction system. The protection settings have to be done for all possible states in traction system including identification of short-circuits in the case of recuperation...
This paper introduces the method of setting up of the 750kV line model, in accordance with the model of 750kV lines running in different systems under various fault happened a detailed simulation, and according to the simulation results discussed in the transient process of 750kV line and the impact of the protection algorithm of the transient course is discussed.
The Modeling methods for elements (equipments) in the primary circuits of Gas Insulated Substation (GIS) are discussed and summarized. The EMTP is used to set up the simulation model of the primary and secondary circuits of an 110kV GIS and the Very Fast Transient Overvoltage (VFTO) and conducted interference caused by swiching operations traveling to the secondary circuits are calculated. The so-formed...
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