Hydrogen Concentration Control in Oil-Filled Power Transformers Using Field Effect Capacitive Gas Sensors

A simple method is demonstrated for hydrogen concentrations measurement directly in transformer oil and in the gas space above it use a highly sensitive (at the level of units and fractions of ppm) gas sensor based on a metal-insulator-semiconductor capacitive structure (MIS sensor). The results obtained can be used in online monitoring systems and predicting the power transformers integral performance, in particular those that have been put into operation long ago, by tracking slow and invisible at the initial stage aging processes of current-carrying connections and structural elements.

Automated summary

This article demonstrates a simple method for measuring hydrogen concentrations directly in transformer oil and in the gas space above it using a highly sensitive gas sensor. The results obtained can be used for online monitoring systems and predicting the overall performance of power transformers.