Evaluation of Temporary Overvoltages in Power Systems due to Low Order Harmonic Resonances

Temporary overvoltages (TOV) are capable of imposing severe dielectric and thermal stresses on equipment. Although a well-known phenomenon, it is considered only for power frequency, typically. Recent years have shown that low order harmonics during a TOV event should be considered in some scenarios.

Apart from the metal-oxide surge arresters, there are no standardized testing procedures related to the TOV capability of the equipment. Consequently, the TOV withstand characteristics of the equipment is unclear, especially under voltage stresses with harmonic content.

The tutorial will:

• Introduce the phenomenon and the possible consequences for key apparatus;
• Discuss grid modelling aspects so that the phenomenon can be properly simulated and captured;
• Introduce different assessment…