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Study on Transformer DGA Technology Based on Photoacoustic Spectrpscopy Theory

Author: LiYangLiu
Tutor: ZhaoXueZeng
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: DGA Photoacoustic spectroscopy Lock-in amplifier
CLC: TM40
Type: Master's thesis
Year: 2007
Downloads: 174
Quote: 1
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Abstract


DGA technology is an important means of routine monitoring of oil-filled electrical equipment . In this paper, on the basis of the main advantages and disadvantages of the Summary of the current transformer DGA technology to analyze gas photoacoustic spectroscopy detection technique is applied to the advantage of the transformer DGA system and describes the historical background of the photo-acoustic spectroscopy , development status , and Photoacoustic spectroscopy characteristics . Start from the theory of molecular structure and molecular spectroscopy , this paper discusses the detection principle of photoacoustic spectroscopy gas concentrations , including the absorption of light , source of thermal power density generated photoacoustic signal excited . The correspondence relationship of the relationship of the photoacoustic signal and the light intensity, the concentration of gas molecules , and the derivation of the corresponding relationship of the gas concentration with the microphone output electrical signal , applied to the detection method of the gas concentration of Photoascoustics transformer DGA system provides a theoretical basis . Gas concentration detection based on photoacoustic spectroscopy theory , this paper establishes a theoretical model of the transformer DGA system . The analysis of the infrared absorption lines of the six fault gases , the detection wavelength was chosen to avoid interference in the fault gas spectral lines cross , system light source the work wavelength range ; contrast nonresonant photoacoustic cell resonance light the sound of the advantages and disadvantages of the pool based on the design of a small one for non - resonant transformer DGA system volume photoacoustic cell . In this paper, the research on the theory of weak signal detection and noise suppression methods using cross-correlation detection technology designed phase-locked amplifier circuit to replace the lock-in amplifier instrument microphone output signal detection and processing . The design of the circuit using analog multiplier to achieve the function of the phase-sensitive detector , and by the active integrator circuit and the low pass filter and to reduce fluctuations in the output signal , the simulation results show that the circuit can achieve a higher signal - to - noise ratio . Finally, the design system of the experiment of the gas concentration is detected and verified by experimental data the design of the system part of the feasibility, and fitting of the response curve of the detection system .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > General issues
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