Date of Award

4-2016

Degree Name

Master of Science in Engineering

Department

Electrical and Computer Engineering

First Advisor

Dr. Pablo Gomez

Second Advisor

Dr. Johnson Asumadu

Third Advisor

Dr. Ralph Tanner

Keywords

Fault location in transformers, transformer windings model, MTL Theory and zigzag, electromagnetic transients, parameter determination for transformer windings

Access Setting

Masters Thesis-Open Access

Abstract

Power transformers are one of the most important components in electrical power systems. During their lifetime they are exposed to various electrical faults which are originated from transient overvoltages, electromagnetic forces due to over-currents, ageing, etc.

Internal winding faults are among the most common causes of transformer failure. Once a fault occurs, a fast an efficient method for its detection and location is required to avoid further delays in the network operation. This paper introduces a simple method for the location of internal winding faults. This method is based on time domain terminal measurements of wave propagation along the winding. By means of low-cost laboratory components (a low-voltage DC source and an oscilloscope), different types of faults in layer–type windings can be detected and located with high accuracy. A frequency-domain distributed-parameter winding model is used to predict the transient response of the winding subjected to different types of faults. FEM simulations are used to compute the model parameters. A test case is presented to demonstrate the efficacy of the fault location method.

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