Distribution transformers not subject to destructive failure: Phase 3, Design improvements and preliminary market analyses: Final report
This research project investigated the substitution of inorganic high temperature insulating materials for the oil/paper system in present transformer designs. A variety of designs for a transformer were studied and the processing techniques necessary to fabricate transformers were developed. Materials were found that could function successfully as turn-to-turn insulations and barrier insulations. But in order to utilize these materials effectively a pancake coil design had to be developed along with the necessary fabrication techniques. Twenty 25 kVA field test transformers were constructed and supplied to host utilities across the country. This report describes work to improve the transformer efficiency and to examine the feasibility of commercializing the non-destructive transformer technology. The initial market penetration would be limited to special utility and industrial market applications in competition with cast coil and open ventilated, dry-type transformers. This would involve larger kVA sizes and as a result, larger wide foil concentric designs were considered. It was expected that by building volume in this specialty market the cost of the inorganic materials would be reduced so that eventually this technology could compete in the distribution transformer market.
- Research Organization:
- McGraw-Edison Power Systems Div., Franksville, WI (USA). Thomas A. Edison Technical Center; Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 5913259
- Report Number(s):
- EPRI-EL-5442; ON: DE88920069
- Country of Publication:
- United States
- Language:
- English
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