A case study on FRA capability in detection of mechanical defects within a 400MVA transformer

Mehdi Bagheri, Mohammad Salay Naderi, T. R. Blackburn, Toan Phung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Diagnosis of electrical equipment, particularly distribution and power transformers, which are the heart of generation, transmission and distribution of electrical energy, has been an important issue for a long time. In this study, a 400MVA step-up transformer has been taken as a case study in order to clarify the capability of the Frequency Response Analysis (FRA) method for off-line mechanical fault detection. Detecting mechanical defects of windings is investigated in detail and other diagnostics are performed for a comparison of their efficacy in detection. Mechanical defects can occur due to a variety of disturbances such as short circuit currents, severe explosion of combustible gases, earthquakes, or even unsuitable transportation methods or accidents. Other tests performed were no-load loss and no-load current, insulation resistance, dielectric dissipation factor, short circuit impedance, DC resistance, water content analysis using KFT and frequency domain spectroscopy were conducted as diagnostic methods to determine their capabilities to provide information about transformer winding insulation and physical condition. The FRA tests were performed to determine whether or not it is able to give further detailed information on faults. Measurements of transfer function frequency response of the transformer windings were conducted on the HV windings individually. The test results on these very large transformer windings show that the FRA method is capable of providing further information, compared to other more traditional methods, as to the healthy or defective condition and any physical movement of the transformer windings and core.

Original languageEnglish
Title of host publication44th International Conference on Large High Voltage Electric Systems 2012
Publication statusPublished - 2012
Externally publishedYes
Event44th International Conference on Large High Voltage Electric Systems 2012 - Paris, France
Duration: Aug 26 2012Aug 31 2012

Other

Other44th International Conference on Large High Voltage Electric Systems 2012
CountryFrance
CityParis
Period8/26/128/31/12

Fingerprint

Transformer windings
Frequency response
Defects
Short circuit currents
Insulation
Electric load loss
Power transformers
Fault detection
Water content
Explosions
Transfer functions
Earthquakes
Accidents
Spectroscopy
Gases

Keywords

  • Frequency response analysis
  • High voltage
  • Smart transformer
  • Winding deformation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Bagheri, M., Naderi, M. S., Blackburn, T. R., & Phung, T. (2012). A case study on FRA capability in detection of mechanical defects within a 400MVA transformer. In 44th International Conference on Large High Voltage Electric Systems 2012

A case study on FRA capability in detection of mechanical defects within a 400MVA transformer. / Bagheri, Mehdi; Naderi, Mohammad Salay; Blackburn, T. R.; Phung, Toan.

44th International Conference on Large High Voltage Electric Systems 2012. 2012.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bagheri, M, Naderi, MS, Blackburn, TR & Phung, T 2012, A case study on FRA capability in detection of mechanical defects within a 400MVA transformer. in 44th International Conference on Large High Voltage Electric Systems 2012. 44th International Conference on Large High Voltage Electric Systems 2012, Paris, France, 8/26/12.
Bagheri M, Naderi MS, Blackburn TR, Phung T. A case study on FRA capability in detection of mechanical defects within a 400MVA transformer. In 44th International Conference on Large High Voltage Electric Systems 2012. 2012
Bagheri, Mehdi ; Naderi, Mohammad Salay ; Blackburn, T. R. ; Phung, Toan. / A case study on FRA capability in detection of mechanical defects within a 400MVA transformer. 44th International Conference on Large High Voltage Electric Systems 2012. 2012.
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