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A pod is a propeller propulsion device installed externally to the ship's hull. The pod system comprises a short propulsion shaft, on which the propulsion electric motor is mounted. In most cases, propulsion is achieved by means of fixed pitch propellers powered by an AC synchronous motor (conventional, permanent magnet) or asynchronous electric motor, fitted inside the pod. Amongst the highest failure...
This paper presents a methodology for installing an electric power quality monitoring system onboard a ship in order to manage and optimize the power consumption of electric loads which are considered critical for the overall ship efficiency. The aftermath is a system comprises measuring devices for recording both voltage and current. The loggers are interconnected via a local intranet-preferably...
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...
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...
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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