Preventive overhaul time for power transformers

Conference · Mon Nov 01 04:00:00 EST 1999

OSTI ID:697192

Sarmadi, M ^[1]; Rouhi, J ^[2]; Fayyaz, A ^[3]

---

1. Pennsylvania State Univ., University Park, PA (United States). Electrical Engineering Dept.
2. Univ. of Mazandaran (Iran, Islamic Republic of)
3. Mazandaran Power Co. (Iran, Islamic Republic of)

Power transformers are the major piece of equipment in high-voltage substations. A considerable number of these transformers exist in Iran`s integrated network. Due to the climate diversity and improper usage, many of these transformers age rapidly, suffer failure and are taken out of service before half their useful life. At the present time the utility companies have no specific time-frame and plan for preventive overhaul. Detection of preventive overhaul time will increase the remaining life of transformers and improve the reliability of substations. An exact check of the remaining lifetime of transformers is not yet possible by available diagnostic techniques. In this paper, the authors present a method of identifying the right time for preventive overhaul in 63 kV power transformers. This method is developed based on 25 year transformer performance records in Northern Iran (subtropical climate) and with the utilization of studies done by electrical engineering communities world-wide.

• Research Organization: Illinois Inst. of Tech., Chicago, IL (United States)
• OSTI ID: 697192
• Report Number(s): CONF-990410--PROC.-Vol.2
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
IRAN
MAINTENANCE
POWER SUBSTATIONS
RECOMMENDATIONS
SERVICE LIFE
TIME DEPENDENCE
TRANSFORMERS