Fault case analysis and simulation research of neutral-bus arresters multi-column parallel connected in converter station

Abstract

High-voltage DC arrester is one of the key equipment for overvoltage protection of ultra-high voltage DC (UHVDC) transmission system. This device plays a decisive role in the insulation level of the whole process. The current distribution between resistance pieces of multi-column parallel arresters is non-uniform, which affects the overall energy absorption capacity of arresters. First, a real failure case of ±500 kV Xiluodu-Nuozhadu HVDC project is introduced. Then, the analysis of the specific failure case is proposed. Finally, a corresponding model is built on PSCAD/EMTDC to study the current distribution characteristics.

Keywords

• HVDC power transmission
• overvoltage protection
• current distribution
• arresters
• HVDC power convertors
• high-voltage DC arrester
• key equipment
• overvoltage protection
• ultra-high voltage DC transmission system
• decisive role
• insulation level
• resistance pieces
• multicolumn parallel arresters
• nonuniform
• Xiluodu-Nuozhadu HVDC project
• specific failure case
• current distribution characteristics
• fault case analysis
• simulation research
• neutral-bus arresters multicolumn parallel
• converter station
• voltage 500.0 kV