Multi-gas detection in power transformer oil based on tunable diode laser absorption spectrum

Online dissolved gas analysis (DGA) is an effective technique to obtain the health status information of insulation oil in power transformers. The typical hydrocarbon gases (methane, ethyne, ethene, ethane) decomposed from insulation oil, are the key indicators to diagnose the fault type and severit...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2019-02, Vol.26 (1), p.153-161
Main Authors: Jiang, Jun, Wang, Zhuowei, Han, Xiao, Zhang, Chaohai, Ma, Guoming, Li, Chengrong, Luo, Yingting
Format: Article
Language:English
Subjects:
Absorption
Absorption spectra
Dissolved gases
Ethane
Ethene
Gas analysis
gas detectors
Gas lasers
Gases
Hydrocarbons
infrared measurements
Insulation
insulation oil
Methane
Oils
optical beams
Optical sensors
Optical switching
Power transformers
Transformers
Tunable lasers
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Summary:Online dissolved gas analysis (DGA) is an effective technique to obtain the health status information of insulation oil in power transformers. The typical hydrocarbon gases (methane, ethyne, ethene, ethane) decomposed from insulation oil, are the key indicators to diagnose the fault type and severity. To realize contactless and field measurement, a multi-gas detection system based on tunable diode laser absorption spectrum (TDLAS) is proposed in this paper. Critical technique problems on the light source, long path gas cell, and the topology for multi-gas detection are investigated. Individual central wavelengths of hydrocarbon gases are set at as 1653.72 nm for methane, 1530.37 nm for ethyne, 1620.04 nm for ethene and 1679.06 nm for ethane in the near infrared band. A 10.13 m long multi-pass gas cell is developed with the advantage of anti-vibration design. To share the optical absorption path, an optical switch is adopted to merge the multi-gas detection system. The high sensitivity of the TDLAS multi-gas detection system was demonstrated in the laboratory calibrations, with ethyne detection reaching sub-parts per million level, and the other hydrocarbon gases achieving ppm level. Furthermore, the comparison detection in the real 220 kV power transformer gave evidence to the effective monitoring of DGA, proving it an alternative approach to online detection of multiple gases in power transformer oil.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2018.007535