Use of composite insulators for HVDC disconnectors in seismic areas

Proper sizing for withstanding in polluted conditions is one of the main challenges for HVDC installations: requirements from [1], Contractors and End-Users lead to an overall dimensioning liked to insulators creepage distance parameters rather than to dielectric withstanding need. As a result, insulators for this purpose are noticeably taller than the standard sizes for traditional porjects. On the other side, seismic requirements are becoming more and more severe in many countries worldwide: different classes are recalled in dedicated standards such as [2] & [3].