A Guide To Describe The Occurrence and （一个指南描述发生和）.pdf

A Guide To Describe The Occurrence and Mitigation Of Switching Transients Induced By Transformer And Breaker Switching Device Interaction 1.0 Overview 1.1 Scope This Guide addresses the application of transformers in the presence of oscillatory switching transients. These oscillatory transients are typically produced by the interaction of the breakerswitching device, transformer, load, and system. This Guide defines operating conditions that may produce switching voltages damaging to the transformers insulation system. It discusses the electrical characteristics of the system source, breakerswitching device, transformer, and load and the nature of their transient interaction. It outlines several mitigation methods. Two examples are included. This Guide recognizes that many devices and/or system operations, in addition to breakerswitching devicess, can produce the oscillatory transient waveforms addressed in this guide. The focus of this Guide is on the transformer-breaker switching device interaction as a result of several reports of transformer internal winding failures. This guide focuses only on mechanical switching devices and do not cover semiconductor switching devices. 1.2 Purpose When a transformer is switched into or out of a system, the transient voltage produced at the terminals of the transformer may contain a high frequency oscillatory component. When this oscillatory 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 condi