In order to handle the invalidation problem of fault detection when Kernel Principal Component Analysis(KPCA)modeling sample is impure, a new KPCA monitoring model for power transformer fault detection based on Modified Feature Sample(MFS)method is proposed. A new purification algorithm is proposed to eliminate abnormal samples from original database by using eigenvalue variation. Then a Feature Sample(FS)method is adopted to extract modeling samples of KPCA; compound statistics is used to verify the state ...
【基金】
国家科技支撑计划项目(No.2012BAK09B04)
【更新日期】
2014-12-22
【分类号】
TM407
【正文快照】
1引言油中溶解气体分析(Dissolved Gas Analysis,DGA)是大型油浸式电力变压器内部潜伏性故障检测和诊断的有效手段之一。由于累积效应,采用油中溶解气体的注意值[1-2](即含量限值)来监视变压器运行状况,并不是达到注意值就能确定变压器存在某种故障,而是应该注意跟踪分析。在实