The induction motor equivalent circuit parameters are required for many performance and planning studies involving induction motors. These parameters are typically calculated from standardized motor performance tests, such as the no load, full load, and locked rotor tests. However, standardized test data is not typically available to the end user. Alternatively, the equivalent circuit parameters may be estimated based on published performance data for the motor. Methodologies for obtaining the parameters of the equivalent circuit for an induction motor from the information on the nameplate and an analysis is presented so that the typical parameters of an equivalent circuit can be readily estimated.
Induction motors are considered nowadays the most commonly used electrical machines, which are mainly used as electrical induction motors and sometimes as generators. This is mainly due to the simplicity of composition, low price, light weight, high reliability, easy to command and control performance and not containing parts that could easily breakdown compared with DC machines and synchronous machines. Starting the IM is the most important and dangerous step, where the motor properties play a major role in the evaluation of all electrical motors, and these properties are defined by the following factors:Starting torque. starting current. transient state. smoothness of the starting, simplicity and economics of starting.In this paper, three different methods of starting three-phase Induction Motor are discussed and compared through curves of currents, torque, speed. These methods are Direct On Line, Auto Transformer, Star-Delta, for a constant power load condition. Simulation is made in MATLAB/SIMULINK and comparatively results are estimated to evaluate the best starting method for different range of induction motor rating.
Single line to ground faults are the most prominent faults in the power system. This may damage the generators and transformers in the system ultimately leading to its failure. Introducing a neutral grounding reactor between the neutral and ground in the high voltage system, will reduce the fault current and hence will protect the power system components. . This paper will discuss the advantages, operation, application and selection of the neutral grounding reactor for transformer.
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