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This paper analyzes the way the different number of short-circuited turns during an inter-turn stator fault affects the functional behavior of a salient pole synchronous machine, while this is connected to an infinite bus. In order to achieve more accurate results, two subcases have been examined. In the first one, different number of turns belonging to the same phase is short-circuited, while in...
In this paper an investigation of the synchronous machine behavior during a field short-circuit as the generator is connected to the 50 Hz grid is presented. The behavior analysis has been carried out using the Finite Element Method (FEM) for two cases. In the first one the rotor speed is held constant and equal to the synchronous one, while in the second case the rotor speed is controlled by a PI-controller...
Broken rotor bar/ end-ring is a common fault in squirrel cage induction motors and has been thoroughly investigated in the case of AC grid supply. In this paper, this type of fault is studied in case of inverter driven motor. Induction motor is driven using scalar Volts/ Hz control method. Motor stator current and inverter input current spectra are studied for frequency components due to fault. Inverter...
Analysis, simulation, realization and results of a new kiln drive system consisting of two a.c. Motors, 315 kW size each on common tooth gear are presented in this work. Two separate inverter units control the motors with common rectifier. Illustration of how backlash problems on tooth gear and generally other high cost and maintenance needs are eliminated together with reducing down times and cost...
This paper presents an investigation of transient phenomena of a Salient Poles Synchronous Machine connected to an infinite bus, focusing on the currents of the damper bars, the electromagnetic torque oscillation and the stator currents, during two kinds of short-circuits: (a) an inter-turn in the stator of the synchronous machine between two conductors of different phases and (b) between two conductors...
This paper examines the torsional behaviour of the subsynchronous cascade drive. A four-mass model of the mechanical subsystem is considered in order to study the torsional oscillations of the shaft train due to the - characteristic for this drive - pulsation of the electromagnetic torque. A theoretical analysis is carried out and some guidelines are proposed regarding the design of the mechanical...
The existence of severe mechanical malfunctions and the appearance of mechanical vibrations due to these malfunctions is very critical especially for a high power electromechanical system working in an industrial environment. The reliable diagnosis and the early fixing of these malfunctions is authoritative concerning the demands of the industry. Such a critical electromechanical system for the cement...
During the transient operation of a synchronous generator, a lot of variations in the operation of the machine appear, which are unavoidable and can cause significant oscillations of the load angle θ and the electromagnetic torque. These oscillations can lead the generator to pole slipping. A fault, which is possible to occur, is a short-circuit at the supply of the excitation system of the synchronous...
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