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

Temporary Overvoltage (TOV) is a typical phenomenon accounted for in insulation coordination studies. This overvoltage is defined by IEC as a “power frequency overvoltage of relatively long duration” and the standard testing waveform follows this definition by consisting of a “short-duration power frequency test”.

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C4

System technical performance

This Technical Brochure has been created by a Working Group from the CIGRE System technical performance Study Committee which is one of CIGRE's 16 domains of work.
The scope of SC C4 covers system technical performance phenomena that range from nanoseconds to many hours. SC C4 has been engaged in the following topics: Power Quality, EMC/EMI, Electromagnetic Transients and Insulation Coordination, Lightning, Power Systems Dynamics Performance, and Numerical Analysis. Study Committee C4 deals with methods and tools for analysis related to the technical performance of power systems, with particular reference to dynamic and transient conditions and to the interaction between the power system and its apparatus/sub-systems, between the power system and external causes of stress and between the power system and other installations.

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