An On-Line Monitoring Device for Dissolved Gas in Transformer Oil Based on Spectrum Technology

Abstract

On-line monitoring of dissolved gas in transformer oil can effectively judge the early fault of transformer. The existing monitoring devices are generally based on gas chromatography, which need to be replaced carrier gas and calibrated periodically, therefore, the maintenance work is heavy. In recent years, photoacoustic spectrum technology with the advantages of high accuracy and no carrier gas required is gradually stressed, but its measurement accuracy is susceptible to mechanical vibration and noise, and its main components such as modulation disk is prone to failure. For this reason, this paper proposes an on-line monitoring device for dissolved gas in transformer oil based on spectrum technology, which doesn’t need carrier gas and maintenance during operation. The device is simpler and lighter in structure and better in performance. The device can on-line monitor 7 kinds of dissolved gas in transformer oil, and has functions such as transformer fault diagnosis, remote alarm, local man-machine interaction, local storage, and supports multiple communication modes such as IEC61850 protocol. The field application shows that the device can provide the basis for transformer fault diagnosis.