Incipient Transformer Fault Detected by Combustible Gas Monitoring Program and Ultra-Sound Tests

This paper describes the test methods used to monitor 26 power transformers rated 100,000 kva (kilovoltamperes) for combustible gas in the nitrogen, and the investigation of an incipient fault that was detected by these methods. Screen tests are performed with a combustible gas indicating meter, and gas analysis is done by mass spectrometry.