Insulation Coordination for UHV AC Systems

WG C4.306 has reviewed and discussed insulation coordination practice in the UHV AC range exceeding 800 kV taking into account the state-of-the-art technology, with special reference to higher performance surge arresters. The review has taken into account the accumulated knowledge of various CIGRE working bodies, recent measured data of VFTO and air-gap dielectric characteristics in collaboration with related SC A3 and B3.