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...

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Bibliographic Details
Published in:IET science, measurement & technology measurement & technology, 2020-12, Vol.14 (10), p.901-905
Main Authors: Razzaq, Alaa, Zainuddin, Hidayat, Hanaffi, Farhan, Chyad, Radhi M, Latiff, Anas A, Rahim, H.R.A
Format: Article
Language:English
Subjects:
absorbance curve
cooling medium
correlation analysis
dissolved decay products
electrical stresses
evanescent field D‐shaped plastic optical fibre sensor
fibre optic sensors
high‐voltage transformers
insulation paper
laser light source
optical fibre fabrication
optical polymers
plastics
POF sensor
polishing
power meter
power transformer insulation
refractive index measurement
Research Article
sensor output power
sensor sensitivity
side‐polishing technique
thermal stresses
transformer oil
transformer oil refractive index
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Summary: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.
ISSN:1751-8822
1751-8830
DOI:10.1049/iet-smt.2019.0399