Optical methodology for the health assessment of power transformers

John A. Palmer; Xianghui Wang; Rahmat A. Shoureshi; Arthur A. Mander; Duane Torgerson

doi:10.1117/12.387849

9 June 2000 Optical methodology for the health assessment of power transformers

John A. Palmer, Xianghui Wang, Rahmat A. Shoureshi, Arthur A. Mander, Duane Torgerson

Proceedings Volume 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV; (2000) https://doi.org/10.1117/12.387849
Event: SPIE's 5th Annual International Symposium on Nondestructive Evaluation and Health Monitoring of Aging Infrastructure, 2000, Newport Beach, CA, United States

Abstract

Among the most critical components in the electric power system is the power transformer. As such, a significant body of research has been put forward to attempt to anticipate the needs for maintenance to be performed. Traditional health assessment has required sampling of oil for submission to a laboratory for analysis, but this has been deemed undesirable in light of budgetary constraints on maintenance staffing, and new predictive maintenance philosophies for substation equipment. A number of processes have been developed in recent years for online health assessment of transformers, most of which have focused on dissolved gas analysis. This paper describes a novel optical methodology for on-line transformer health assessment that utilizes an ultraviolet absorption measurement to identify the degradation of the transformer oil. An optical system was selected because of its immunity to the electromagnetic noise typical of substations, and because of the minimal impact that non-conducting materials have on the insulation system design of the transformer. The system is designed to identify deterioration and premature aging resulting from overheating, low level arcing or excessive exposure to atmospheric air. The system consists of a light source, filter, guide and detection components, and a very simple computational requirement. The measurements performed with the prototype system are validated with a high precision spectrophotometry measurement and an independent oil-testing laboratory.

Citation Download Citation

John A. Palmer, Xianghui Wang, Rahmat A. Shoureshi, Arthur A. Mander, and Duane Torgerson "Optical methodology for the health assessment of power transformers", Proc. SPIE 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV, (9 June 2000); https://doi.org/10.1117/12.387849

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KEYWORDS

Transformers

Prototyping

Absorbance

Light sources

Waveguides

Absorption

Ultraviolet radiation

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