ZHOU Xiao-qin1, GOU Rui-feng1, LU Jin-zhuang2, et al. Arrester Protection at Valve-side of Highest Potential Converter Transformer in ±800 kV UHVDC Project[J]. High voltageapparatus, 2009, 45(2): 1-3+6.
ZHOU Xiao-qin1, GOU Rui-feng1, LU Jin-zhuang2, et al. Arrester Protection at Valve-side of Highest Potential Converter Transformer in ±800 kV UHVDC Project[J]. High voltageapparatus, 2009, 45(2): 1-3+6.DOI:
The arrangement scheme of surge arresters for ±800 kV UHVDC transmission line converter station is different from the one for ±500 kV HVDC transmission line converter station.For example
additional arresters are adopted in ±800 kV UHVDC converter station to further limit over-voltage at several special locations
including an A2 arrester which is set on the highest potential converter transformer side to protect the equipment at valve-side.Focusing on Yunnan-Guangdong ±800 kV UHVDC project
this paper analyzes the necessity of A2 arrester.Typical fault cases with and without A2 arrester at the valve-side of the converter station are chosen to calculate the over-voltage at relevant positions
respectively.The results show that the scheme with A2 arrester can protect directly the valve-side of the converter transformer at highest potential
and reduces the insulation level of valve-side equipment effectively
which results in lower production cost and manufacture difficulty of UHVDC converter transformers