Abstract
In this paper, we present the preliminary results of our study on the use of a fiber optic sensor as a diagnostic and monitoring tool for evaluating the condition of transformer oil. An all-optical-fiber sensing system using a Mach-Zehnder interferometry technique was constructed to monitor acoustic wave propagation properties in differently aged transformer oil. It was found that the measured sound attenuation in the oil varies as it degrades, suggesting that the observation of sound attenuation with the fiber optic sensor can indicate the condition of service-aged transformer oil.
Highlights
IntroductionThe evaluation of the condition of transformer oil is carried out by a method of analyzing the acidity, applying a breakdown voltage, and analyzing the resulting gas at the laboratory
An ultrasound source was placed in the test cell filled with transformer oil, and a piezoelectric sensor and a fiber optic sensor coil were positioned at a distance of 0.1 m from the acoustic emitter
We have proposed the use of fiber optic sensors for monitoring the condition of transformers
Summary
The evaluation of the condition of transformer oil is carried out by a method of analyzing the acidity, applying a breakdown voltage, and analyzing the resulting gas at the laboratory These tests are only performed for sample materials without testing them immediately on the spot, and appropriate action cannot be taken before failures occur through a faster-than-normal aging process. Effective diagnostics are those that can be carried out without interrupting the operation of the equipment so that if there is a problem, the transformer oil can be replaced before it fails. In addition to the use of fiber optic sensors for the detection of a partial discharge, these sensors can be used to assess the condition of transformer oil in the same way that they detect the variation of acoustic wave attenuation in the aged oil
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