Power transformer oil-level measurement using multiple fiber optic sensors

D. Mahanta, S. Laskar
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引用次数: 5

Abstract

This paper presents two different optical fiber based sensors system for measurement of oil level of a power transformer. One uses a continuously uncladed multimode optical fiber with uncladded portion equals to the measurement range. The other one uses multimode optical fiber with discretized uncladed portions that equals the measurement range. Differential measurement technique has been adopted to eliminate the environmental affect on the measurand using a reference identical multimode optical fiber for both continuous and discrete sensors. A beam splitter is used to split a laser light emitted from He-Ne laser source to produce two identical beams of rays. These two beams are applied to the sensing fiber and to the reference fiber. The sensing principle is based on the evanescent wave interaction. The output intensity of light through the sensing fiber depends on the change in refractive index due to change in relative length of air and transformer oil in proximity of uncladed portion of the sensors. The outputs light from the sensing and reference fibers are applied to two identical potential divider circuits to convert variation of light intensity in to voltages. The voltages of the potential divider circuits are read by a data acquisition card (DAQ) and analysis is carried out using LabView software. The optical sensor has many advantages which includes low cost and simple design, high sensitivity, light weight, immune to electromagnetic interference and radio frequency interference, etc.
电力变压器油位测量采用多个光纤传感器
本文介绍了两种基于光纤的电力变压器油位传感器系统。一种是使用连续无包层多模光纤,其无包层部分等于测量范围。另一种采用多模光纤,离散的无包层部分等于测量范围。采用差分测量技术消除了环境对连续型和离散型传感器测量结果的影响。分束器用于将氦氖激光源发出的激光进行分束,产生两束相同的光束。这两束光分别作用于传感光纤和参考光纤。传感原理基于倏逝波相互作用。通过传感光纤的光输出强度取决于由于传感器未包覆部分附近空气和变压器油的相对长度变化而引起的折射率变化。从传感光纤和参考光纤输出的光被应用到两个相同的电位分压器电路中,以将光强度的变化转换为电压。通过数据采集卡(data acquisition card, DAQ)读取分压器电路的电压,并使用LabView软件进行分析。光学传感器具有成本低、设计简单、灵敏度高、重量轻、不受电磁干扰和射频干扰等优点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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