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C57.142 - Guide to Describe the Occurrence and Mitigation of Switching Transients Induced by Transformers, Switching Device, and System Interaction

When a transformer is switched into or out of a system, the transient voltage produced at the terminals of the transformer may contain several high frequency oscillatory components. When this oscillatory transformer terminal voltage has a frequency component near one of the natural frequencies of the transformer and is of sufficient magnitude and duration, permanent damage to the transformer internal insulation structure may result. The purpose of this Guide is to provide aid in the recognition of conditions and applications where transformers are subjected to terminal oscillatory switching transients that may produce internal winding voltages damaging to their internal insulation structure. This is accomplished by developing necessary expressions that characterize this interaction. This guide also characterizes the transformer, switching device, system, and load during this type of event. Many of the parameters that influence this system are presented, to assist the user in developing an understanding when a potential concern exists. Finally, several mitigation methods are outlined.
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