摘要
结合电力行业标准DL/T 6 2 0— 1997对变压器装设中性点间隙保护的有关规定和要求 ,以枫树坝电厂 2号主变压器中性点出现不接地运行过程中 ,高压侧断路器操作机构故障所引起的主变压器事故为实例 ,对断路器因操作机构故障出现非全相动作或严重不同期所引起的基频、分频及高频铁磁谐振进行验算。分析过程对变压器有关断路操作引起铁磁谐振的核算和中性点间隙保护的选择有指导价值。
No 2 main transformer in Fengshuba Power Plant experienced, when operating with neutral isolated, a failure resulting from faulty control mechanism of HV side circuit breakers (CB). Taking this accident as an example, and in light of the specifications of Chinese Power Standard DL/T 620 1997 on neutral gap protection of transformers, this paper makes a computational check on ferroresonance at basic, divided and high frequencies caused by CBs open phase or seriously nonsynchronous operation arising out of the control mechanism faults. The analytical process can give guidance for computational check on ferroresonance arising from transformer associated CB operation and the choice of neutral gap protection.
出处
《广东电力》
2000年第6期22-24,共3页
Guangdong Electric Power
关键词
铁磁谐振
断路器
操作机构
数学模型
open phase operation of CB
ferroresonance
over voltage
transformer
