Abstract
Acoustic emission monitoring is often used in the diagnosis of electrical and mechanical incipient faults in the high voltage apparatus. Partial discharges are a major source of insulation failure in electric power transformers, and the differentiation from other sources of acoustic emission is of the utmost importance. This paper reports the development of a new sensor concept — a fiber laser sensor based on a phase-shifted chirped fiber grating — for the acoustic emission detection of incipient faults in oil-filled power transformers. These sensors can be placed in the inner surface of the transformer tank wall, not affecting the insulation integrity of the structure and improving fault detection and location. The performance of the sensing head is characterized and compared for different surrounding media: air, water, and oil. The results obtained indicate the feasibility of this sensing approach for the industrial development of practical solutions.
Highlights
Fiber sensors are used in power transformers to detect acoustic emissions (AE) that are generated by electrical and mechanical sources [1]
This paper reports the development of a new sensor concept – a fiber laser sensor based on a phase-shifted chirped fiber grating – for the acoustic emission detection of incipient faults in oil-filled power transformers
With the intrinsic advantages of fiber optics sensors in mind, this paper describes the development of a fiber laser sensor based on a phase-shifted chirped fiber grating for detection of acoustic emission with characteristics adapted to utilization in power transformers
Summary
Fiber sensors are used in power transformers to detect acoustic emissions (AE) that are generated by electrical and mechanical sources [1]. EDFRLs using the phase-shifted linearly chirped FBG (PS-LCFBG) were reported [16] This laser configuration had a simple all-fiber structure and is cost-effective for use in applications as optical sensing. With the intrinsic advantages of fiber optics sensors in mind, this paper describes the development of a fiber laser sensor based on a phase-shifted chirped fiber grating for detection of acoustic emission with characteristics adapted to utilization in power transformers. Data have been collected from literature (front wave pressure, duration, frequency content, repetition rate, etc), which allowed the reproduction of acoustic waves that were generated by partial discharges This procedure, from the acoustic point of view, could be the most reliable way to reproduce, in the lab, the main characteristics of a real PD occurrence.
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