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The paper describes two specific transient phenomena of different characteristic frequencies. First, a short overview of a calculation of overvoltages in the generator main electrical circuit of a hydro power station is presented. A case of a generator connected to the step-up transformer through encapsulated lines has been studied. The most critical cases have been considered: overvoltages at a single...
The aim of this paper is to analyze the dynamics of diesel generator units with different proportional-integral voltage controller parameters. Effect of changes of gain and time constant of voltage controller, during direct-on-line starting loaded induction motors connected to a synchronous generator in autonomous operation, is considered.
The paper presents the mathematical model of the electric power system with several synchronous generators. It enables the analysis of stability in the circumstances of large disturbance in a power system. The analysis has been performed for the generator with separate excitation and the generator with self-excitation.
The paper analyses dynamics of diesel-generator-unit during direct-on-line starting of induction motors. Mathematical model of integral motor drives has been developed, consisting of: diesel engine, synchronous generator and motor drives fed directly from generator unit terminals. The aim is to compare dynamics during starting loaded induction motors with different loads.
The main objective of this paper is to analyse dynamic behavior of diesel-generator units due to electrical loads and due to torsional strains on the shaft cable. A flexible coupling between generator rotor and rotating mass of diesel engine allows masses to rotate at a different speed in transient. In order to investigate the dynamic behavior of synchronous generator as well as torsional strains...
The paper analyses the dynamics of generator-units during start-up of the induction motor drives. A unique mathematical model of integral motor drives has been developed, consisting of: a diesel engine, a synchronous generator and two non-regulated motor drives fed directly from generator-unit terminals. The aim of this paper is to compare dynamics behaviours of the generator-units during starting...
The influence of TiO 2 addition in sintering magnesium oxide was investigated as a function of the time and temperature of isothermal sintering and of the quantity of the addition. The magnesium oxide used was obtained from sea water by precipitation of magnesium hydroxide with 80% of the stoichiometrical quantity of dolomite lime. It has been noted that the content of B 2 O 3...
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