access icon free Measurement of dissolved decay products of transformer oil using D-shaped plastic optical fibre as a sensor

Transformer oil is widely used in high-voltage transformers as a cooling and insulation medium. Electrical and thermal stresses expose transformer oil to degradation, which may produce dissolved decay products (DDPs) that are partially adsorbed on the insulation paper and accelerate the degradation of oil and paper. An evanescent field D-shaped plastic optical fibre (POF) sensor was fabricated using the side-polishing technique to detect DDPs in transformer oil. A laser light source and power meter were used in the prototype to measure the output power of the POF sensor. The measurement of DDPs was conducted on seven samples of insulating oil collected from the field. The sensor performance was evaluated based on different sensing areas, and the sensor sensitivity was measured. Results show an excellent correlation between the output power and DDPs. A correlation analysis was conducted amongst sensor output power, transformer oil refractive index and area under the absorbance curve. The performance of the sensor demonstrates improved linearity and sensitivity of 97.49% and 26.6779 µW/RIU, respectively. The POF sensor is easily fabricated, low cost and can be used for real-time monitoring of high-voltage transformers.

Inspec keywords: optical polymers; refractive index measurement; plastics; transformer oil; paper; polishing; power transformer insulation; optical fibre fabrication; fibre optic sensors; thermal stresses

Other keywords: sensor sensitivity; evanescent field D-shaped plastic optical fibre sensor; POF sensor; electrical stresses; thermal stresses; sensor output power; cooling medium; correlation analysis; dissolved decay products; side-polishing technique; insulation paper; transformer oil refractive index; laser light source; absorbance curve; high-voltage transformers; power meter

Subjects: Fibre optic sensors; fibre gyros; Optical polymers and other organic optical materials; Optical refractometry and reflectometry; Optical materials; Fibre optic sensors; Optical variables measurement; Fibre optics; Organic insulation; Optical fibre fabrication, cladding, splicing, joining

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