Abstract
In contrast to conventional HVDC transmission projects where only a single 12-pulse converter is connected per pole, UHVDC transmission projects generally require more than one 12-pulse converter, which are connected in series per pole due to the restriction of equipment manufacturing and transport conditions. As such, a UHVDC transmission systems have more operation modes than conventional DC transmission projects and the operating voltage of a DC transmission system is significantly different from that of an AC transmission system. This chapter therefore considers system overvoltage and insulation coordination as these relate to engineering design and operation modes, including: steady-state operating voltage; configuration of surge arresters; overvoltage and suppression measures; lightning protection and insulation; and the coordination of UHVDC transmission systems.
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