浅析特高压交流站的母线保护

摘要

特高压交流试验示范工程扩建工程，新增1000kV母线并配置了相应的母线保护，这是全球最高电压等级（1000kV）的第一套母线保护。特高压交流南阳站，500kV本期为“母线不分段+3/2断路器接线”，终期为“母线分段+3/2断路器接线”，500kV母线保护装置适用于本期、终期、远景等多个阶段的接线要求，此为该类接线在华中500kV电网的首次应用；在国内第一次将专用负荷开关用于低容和低抗等无功设备的投切，特别考虑了110kV母线保护的回路设计，以适应大、小两种不同整定值的故障电流。%In the extension project of Ultra High Voltage Alternating Current trial and demonstration project, the 1000kVbusbars are newly built and 1000kV bus bar protection is equipped. It is the first time for the 1000kV busbar protection to put into commercial operation on the highest voltage level of power grid around the world. The 1st Phase of 500kV main connection scheme is Single Busbar without Breaker Section plus 3/2 Circuit Breakers scheme, and the final phase is Single Busbar with Breaker Section plus 3/2 Circuit Breakers scheme. The 500kV busbar protection should be adapted to various stages of the UHV AC substation, and this 500kV single line scheme is the 1st one of this kind in the Central China region. It is the 1st time in the China area, Load Breaker Switch is used for switching on or off the Reactive Power device, and it can be also applied for two different situations of fault current, the Large Setting Value and the Small Setting Value.