Hypothesis testing for fault analysis and the propagation of faulted voltage through transformer connections

Abstract

Power systems fault have been considered as the highest contribution of voltage sags (dips). The occurrence of symmetrical and unsymmetrical fault can not be predicted as its occurrence is highly depended on the unexpected occurrences. Propagating faulted voltage resulting sag voltages are much of concern due to the wideness usage of modern equipment that is sensitive to these types of disturbances. It is important to categorize first the type of fault that is occurring before predicting the type of sag that results from the propagation of faulted voltage. Eventhough the occurrence of fault voltages cannot be predicted, but the resulting propagation of the faulted voltage that introduces sag voltage may necessarily be predicted. Thus the intention of this report being written is to predict the type of fault that occurs in a power system network and the resulting propagated faulted voltage under the influence of transformer connections. A test system consists of synchronous generator, transmission lines and transformers will be used to model a power system network. Power System Simulator for Engineering (PSS/E) will be used to simulate faulted event and test of hypothesis will be conducted to classify type of fault by using data from monitoring equipment that is being installed by utilities at 33/11 kV feeders. It is hope from the results of this work, power system faults can be characterized and be classified to its properties and the propagated faulted voltage that introduces sagged voltage can be monitored to ensure no harm for utilities and consumers.