Online monitoring system for gas content in transformer oil by using photoacoustic spectrum

Abstract

The invention relates to an online monitoring system for gas content in transformer oil by using photoacoustic spectrum; the online monitoring system comprises an oil line system, a gas path control module, a photoacoustic spectrum monitoring module and a signal conditioning and analyzing module. The online monitoring system is based on the photoacoustic spectrometry, can replace an offline chromatographic instrument and operate stably for long time on site, can be used for detecting various gases and simultaneously greatly reduces the complexity of detecting the oil line in a transformer on line and the instability of the system.

Description

technical field [0001] The invention relates to the field of on-line monitoring of high-voltage electrical equipment, in particular to a system for on-line monitoring of gas content in transformer oil by using photoacoustic spectroscopy. Background technique [0002] Since the current regular maintenance system commonly implemented in the power system is no longer suitable for the needs of power system reform and development and the requirements of power users for power supply reliability, power companies have urgently needed to implement more advanced condition-based maintenance in the world, that is, according to the equipment The operating status determines whether maintenance is needed and how to maintain it, and online monitoring is a necessary and effective means to implement condition-based maintenance of high-voltage electrical equipment. [0003] Since power transformers, bushings and other electrical equipment are all made of insulating oil or oil paper and cardboa...

AI Technical Summary

Problems solved by technology

The off-line gas chromatograph has the advantages of good selectivity, high separation performance, fast separation time, high sensitivity and wide application range, but there are also a series of shortcomings, such as human error in degassing operation, manual correction of detection curve, etc. It will also increase the error; from oil sampling to oil and gas separation to laboratory analysis, the operation procedure is complicated and takes a long time; in addition, the development of insulation deterioration varies from time to time, and preventive experiments cannot detect faults in real time. On-line monitoring of gas content in oil has become an urgent need

The online gas chromatograph monitoring system solves the shortcomings of the off-line gas chromatograph, such as long detection cycle and long analysis time.

However, most of the current online gas chromatography monitoring systems, such as the method mentioned in the "MGA2000 Transformer Oil Gas Online Monitoring Device" of Ningbo University of Technology, only use gas in oil smart sensors for measurement, which has low measurement accuracy, less gas to be measured, and long-term work. Unstable and heavy maintenance

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