Thermal characteristics of a meta-aramid and cellulose insulated transformer at loads beyond nameplate
- E.I. DuPont deNemours and Co., Inc., Wilmington, DE (United States)
- Whearty (R.J.), Marlton, NJ (United States)
Advancement in meta-aramic--a synthetic, aromatic polyamide in which the phenyl molecules are connected in the meta orientation--paper and pressboard technology has lead to production of a high temperature insulation system that can be used in transformers, replacing cellulose materials in the windings, thereby eliminating the cellulose temperature limitation. A medium-power mineral oil-immersed transformer was constructed with a hybrid insulation system comprised of meta-aramid paper and pressboard insulated windings and cellulose bulk insulation. Fiber-optic temperature sensors were installed for direct reading of oil and conductor temperatures at key points throughout the transformer. The transformer was tested and thermal constants were determined in accordance with PC57.119/D12 for both ONAN and ONAF cooling modes at load levels up to 137% of the maximum nameplate rating of an otherwise identically designed all cellulose insulated unit. Temperatures predicted by equations in the ANSI/IEEE C57.92 Loading Guide were compared with measured values. Anomalies in the data are investigated and explanations offered.
- OSTI ID:
- 477206
- Report Number(s):
- CONF-960111-; ISSN 0885-8977; TRN: IM9724%%83
- Journal Information:
- IEEE Transactions on Power Delivery, Vol. 12, Issue 1; Conference: IEEE Power Engineering Society (PES) Winter meeting, Baltimore, MD (United States), 21-25 Jan 1996; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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