Abstracto

Experimental Evaluation of Water Content In Transformer Oil

PankajShukla, Y.R. Sood, R.K. Jarial

This paper presents experimental research on temperature dependency of water content in mineral transformer oils. Moisture sensor measurements (online measurement) and absolute water content determination by Karl Fisher titration method (off-line method) were performed in the laboratory to investigate solubility of different types of mineral transformer oils. Results of experiments explain that preset moisture solubility model of moisture sensor affects the accuracy of water content determination. Test setup and procedure for verification and calibration of moisture sensor with specific-oil solubility parameters is described then tested and evaluated. This allows greater accuracy of online water content monitoring in the operating transformers under the changing temperature conditions.