Title :
A study of failure of pole mounted distribution transformers
Author :
Al-Arainy, A.A. ; Malik, N.H. ; Qureshi, M.I.
Author_Institution :
Electr. Eng. Dept., King Saud Univ., Riyadh, Saudi Arabia
Abstract :
This paper reports on the findings of a field study carried out to determine the causes of premature failures of pole mounted distribution transformers installed in mountainous regions of Saudi Arabia that have comparatively high isokauranic level. The study consisted of transformer failure data analysis, field surveys to inspect installation of transformers, protective devices and grounding arrangements and measurements of grounding resistances, and laboratory measurements on new and used transformers as well as on surge arresters. Based on the study, several possible causes were identified as contributory factors for high failure rates. Recommendations were extended both to power utility as well as local transformer manufacturers. With the implementations of these recommendations, the failure incidences reduced significantly. This paper provides a summary of the study and main findings.
Keywords :
data analysis; earthing; electric resistance; electrical installation; failure analysis; power transformers; Saudi Arabia; grounding arrangements; grounding resistances; high failure rates; high isokauranic level; laboratory measurements; local transformer manufacturers; mountainous regions; pole mounted distribution transformer failure; power utility; premature failures; transformer failure data analysis; transformer installation; Arresters; Conductivity; Grounding; Power transformer insulation; Resistance; Surges; Grounding; Insulation failure; Lightning; Pole mounted transformers; Surge arresters;
Conference_Titel :
High Voltage Engineering and Application (ICHVE), 2012 International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4673-4747-1
DOI :
10.1109/ICHVE.2012.6357062