Abstract
In terms of overvoltage and insulation coordination, a UHV system is similar to an extra-high-voltage (EHV) system. However, as UHV system lines are characterized by a larger transmission capacity, longer transmission distances, and large reactive power (the reactive power per 100km of 1000-kV lines reaches up to about 530Mvar) such that: (1) load rejection may cause serious temporary overvoltage; (2) changes in load during normal operation may cause many problems in respect of reactive power regulation, voltage control, and extinction of secondary arc resulting from single-phase reclosing. Additionally, considerations such as the saturation of large air gaps under high-voltage and high-altitude installation, etc., have resulted in complicated insulation structures and increased equipment size, affecting manufacturing costs and other indices of the equipment. This chapter addresses how more stringent requirements can be placed on overvoltage suppression and insulation coordination.
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