南桥换流站阀侧套管故障录波分析及阀短路保护改进建议  

TFR Analysis of Nanqiao Tonverter Cransformer Fault and Proposal for Improving Valve Short Circuit Protection

作　　者：沈志刚 张海燕 

机构地区：[1]国网运行有限公司上海超高压管理处,上海201402

出　　处：《高压电器》2010年第6期98-102,共5页High Voltage Apparatus

摘　　要：2008年12月21葛洲坝—南桥±500 kV直流输电工程南桥换流站极2换流变C相阀侧2.1套管箱体内油浸部分爆裂。笔者通过对故障跳闸相关保护录波图的分析,推断出故障性质及故障点位置,为迅速查清故障提供了支持。换流变现场吊套管调查进一步证实了波形分析结论。对故障录波图的进一步分析,发现阀短路保护在桥臂接地故障发生时不能快速动作,会导致故障范围扩大,因此提出通过修改差动电流检测逻辑完善该保护的建议。该建议对葛—南、龙—政、宜—华三个超高压直流输电工程均具有指导意义。The valve-side HV bushing（No.2.1） inside the converter transformer,phase C pole Ⅱ in ±500 kV Nanqiao converter station（Shanghai） blasted during operation on Dec.21 2008.By analyzing the TFR diagram,the fault characteristics and its location was deduced and then the fault was found out soon.One defect in valve short circuit protection design was picked up by the analysis which would have the fault escalated while the valve bridge is earthed.To overcome the defect one proposal to improve the logic of the differential current caculation is described which will benefit the projects of Gezhouba-Nanqiao,Three Gorges-Changzhou and three Gorges-Shanghai HVDC links.

关 键 词：换流变 阀侧套管 故障 波形分析 阀短路保护 改进建议 

分 类 号：TM772[电气工程—电力系统及自动化]