Double Valve Group Blocking Fault and Protection Action Analysis of Chusui UHVDC Power Transmission System

doi:10.3969/j.issn.1000-7229.2014.01.011

Abstract

Abstract:

Based on the blocking fault of monopole double valve group in ±800 kV Chusui UHVDC transmission system happened on Dec. 15, 2012, the analysis of on-site equipment checking, relevant recorded wave and protection actions were carried out. It points out that Pole 1 blocking was caused by the asymmetric operation of two groups of Pole 1. Moreover, the mismatch of the grounding lines and the insulation level of the neutral bus resulted in the flashover and imbalance protection action of grounding lines. Finally, this paper also suggests reasonable improvement measures for the exposed problems.

Key words: UHVDC transmission, overvoltage, blocking, fault analysis

LI Yang. Double Valve Group Blocking Fault and Protection Action Analysis of Chusui UHVDC Power Transmission System[J]. ELECTRIC POWER CONSTRUCTION, 2014, 35(1): 57-61.

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