Transient regimes in electrical networks

This dossier provides an introduction to electromagnetic transients in power systems. It begins with theoretical reminders and definitions, followed by a presentation of modeling principles. The special case of lines and cables is discussed in greater detail. The final section uses examples to describe transient phenomena and present simulation results.

As the range of transient phenomena likely to occur on a network is very wide, this dossier focuses mainly on those which appear to have the greatest impact today. The aim is also to provide a new vision in line with the current sophistication of simulation tools and models.

The analysis of electromagnetic transients is an important subject in the study of electrical networks. Transient phenomena must be analyzed at the design stage of networks to ensure their optimization and robustness. Optimization means operating close to technical limits and reducing costs. Robustness means continuity of service, reliability, safety and quality. Furthermore, understanding transient phenomena is essential in analyses carried out in the event of equipment failure or abnormal operation.

The simulation of electromagnetic transients in power systems is the subject of the dossier [D 4 130].

Readers unfamiliar with the study of electrical networks in general can consult the :

• "Interconnection and transmission networks: how they work" [D 4 091] ;

• "Dynamic power system simulation tools [D 4 120].