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When lightning strikes the DC transmission line and causes flashover, the transients propagating in the primary circuit and impulse electromagnetic field generated in the station might cause interference or even block fault of the UHVDC system. In this paper, artificial short-circuit (DC line to ground) experiments are conducted out on an operating ± 800 kV DC system at different distances to the...
Abnormal bipolar block accidents caused by single-pole DC line lightning strikes happened several times in the Yunnan-Guangdong ±800kV UHVDC system in South China, which are serious threats to system security. In this paper, the lightning transients in the primary and secondary circuits of both faulted and sound poles in UHVDC system are studied, in order to reveal the mechanism of such accidents...
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