Copula-based statistical health grade system against mechanical faults of power transformers

Chao Hu, Pingfeng Wang, Byeng D. Youn, Wook Ryun Lee, Joung Taek Yoon

Research output: Contribution to journalArticlepeer-review

Abstract

A health grade system against mechanical faults of power transformers has been little investigated compared to those for chemical and electrical faults. This paper thus presents a statistical health grade system against mechanical faults in power transformers used in nuclear powerplant sites where the mechanical joints and/or parts are the ones used for constraining transformer cores. Two health metricsRMS and root mean square deviation of spectral responses at harmonic frequenciesare first defined using vibration signals acquired via insite sensors on 54 power transformers in several nuclear powerplants in 16 months. We then investigate a novel multivariate statistical model, namely copula, to statistically model the populated data of the health metrics. The preliminary study shows that the proposed health metrics and statistical health grade system are feasible to monitor and predict the health condition of the mechanical faults in the power transformers.

Original languageEnglish (US)
Article number6301803
Pages (from-to)1809-1819
Number of pages11
JournalIEEE Transactions on Power Delivery
Volume27
Issue number4
DOIs
StatePublished - 2012
Externally publishedYes

Keywords

  • Copula
  • health grade system
  • health monitoring
  • power transformer
  • vibration

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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