500kV主变高压侧断路器闪络保护配置分析及应用  

Analysis and Application of Flashover Protection Configuration for High Voltage Side Circuit Breaker of 500kV Main Transformer

作　　者：李现启 LI Xian-qi(Yunnan Huadian Jinsha River Midstream Hydropower Development Co.,Ltd.,Liyuan Power Generation Branch,Lijiang 674122,China)

机构地区：[1]云南华电金沙江中游水电开发有限公司梨园发电分公司,云南丽江674122

出　　处：《云南水力发电》2023年第1期190-192,共3页Yunnan Water Power

摘　　要：500kV主变高压侧断路器作为发变组检修后并网的同期点,在并网同步过程中,由于断路器断口耐压能力不足,可能出现一相或两相闪络,产生负序电流损害发电机转子,也可能破坏断路器绝缘,进一步扩大成接地和相间故障,影响电网安全,机组解列,断路器刚断开时也可能出现闪络现象。介绍了500kV主变高压侧断路器装设闪络保护的必要性,并通过分析给出了闪络保护的配置和动作逻辑。As the same time point of grid-connection after generator-transformer overhaul, 500 kV main transformer high-voltage side circuit breaker may cause one or two-phase flashover due to insufficient voltage withstanding capacity of breaker opening during grid-connection synchronization, resulting in negative sequence current damage to generator rotor. It may also destroy the circuit breaker insulation and further expand into earthing and interphase faults, affecting the safety of power grid. When the unit is disjointed, flashover may also occur when the circuit breaker is just disconnected. This paper describes the necessity of installing flashover protection on HV side circuit breaker of 500kV main transformer, and gives the configuration and operation logic of flashover protection through analysis.

关 键 词：同期点 断路器 闪络保护 动作逻辑 

分 类 号：TV734.3[水利工程—水利水电工程]