三相短路故障时小容量发电机出口断路器瞬态恢复电压  

Transient recovery voltage of circuit breaker at small-capacity generator outlet during three-phase short circuit

作　　者：刘渝根[1] 米宏伟[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电力自动化设备》2015年第6期136-142,共7页Electric Power Automation Equipment

基　　金：国家创新研究群体基金资助项目(51021005)~~

摘　　要：利用PSCAD/EMTDC软件计算分析了在开断条件最恶劣的故障情况下,12~30 MW小容量发电机出口断路器的瞬态恢复电压（TRV）,并利用TRV上升率确定普通配电型断路器可以替代发电机断路器（GCB）安装在发电机出口处的条件。计算结果表明：当发电机出线端发生三相短路故障时,普通配电型断路器可以替代GCB安装在12~24 MW的发电机出口处,而24~30 MW的发电机出口处必须安装GCB;当变压器低压侧出线端发生三相短路故障时,普通配电型断路器可以替代GCB安装在12~30 MW的发电机出口处。给出了TRV的手算公式。The TRV （Transient Recovery Voltage） of outlet circuit breaker for generator with 12 to 30 MW capacity under the worst open condition is calculated and analyzed with PSCAD/EMTDC software,and its rising rate is used to deduce the condition that the distribution circuit breaker,instead of the generator circuit breaker,can be installed at the outlet of generator. The calculative results indicate：during the three- phase short circuit of generator outlet,the generator circuit breaker can be replaced by the distribution circuit breaker only when the generator capacity is 12 to 24 MW,while during the three-phase short circuit of transformer low-voltage outlet,the generator circuit breaker can also be replaced by the distribution circuit breaker when the generator capacity is 12 to 30 MW. The manual calculation formula of TRV is given.

关 键 词：小容量发电机 配电断路器 发电机断路器 三相短路故障 瞬态恢复电压 断路器 模型 

分 类 号：TM56[电气工程—电器]