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The story of this book may be traced back to the Winter Meeting that the IEEE Power Engineering Society (now the Power and Energy Society) held in January 1999, when the Task Force (TF) on Data for Modeling Transient Analysis was created. The mandate of this TF was to produce a series of papers that would help users of transient simulation tools (e.g., EMTP-like tools) select an adequate technique or procedure for determining the parameters to be specifi ed in transient models.

The TF wrote seven papers that were published in the July 2005 issue of the IEEE Transactions on Power Delivery. The determination or


estimation of transient parameters is probably the most diffi cult and time-consuming task of many transient studies. Engineers and researchers spend only a small percentage of the time running the simulations; most of their time is dedicated to collecting the information from where the parameters of the transient models will be derived and to testing the complete system model.
Even today, with the availability of powerful numerical techniques, simulation tools, and graphical user interfaces, the selection of the most adequate model and the determination of parameters are very often the weakest point of the whole task. Signifi cant efforts have been made in the last two decades on the development of new transient models and the proposal of modeling guidelines. Currently, users of transient tools can take advantage of several sources to select the study zone and choose the most adequate model for each component involved in the transient process.
However, the following drawbacks must still be resolved: (1) the information required for the determination of some parameters is not always available; (2) some testing setups and measurements to be performed are not recognized in international standards; (3) more studies are required to validate models, mainly those that are to be used in high or very high-frequency transients; and (4) built-in models currently available in simulation tools do not cover all modeling requirements, although most of them are capable of creating custom-made models.




Although procedures and studies of parameter determination are presented for only seven power components, it is obvious that much more information is required to cover all important aspects in creating an adequate and reliable transient model. In some cases, procedures of parameter determination are presented only for low-frequency models; in other cases, all the procedures required for creating the whole model of a component are not analyzed.
In addition, there is a lack of examples to illustrate how parameters can be determined for real-world applications. The core of this book is dedicated to current procedures and techniques for the determination of transient parameters for six basic power components: overhead line, insulated cable, transformer, synchronous machine, surge arrester, and circuit breaker.


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