The generation of gas in an oil filled transformer is a clear indication of a problem. The gas may be a result of the following:

• Decomposition/degrading of solid or liquid insulation inside the transformer due to the overheating, or arcing.
• From the outside towards the pipeline.
• From the oil itself due to unsatisfactory de-gassing prior filling.

Rapid oil movement in the pipeline towards the conservator is caused by an internal arc short circuit, or hot spot which must be correctly addressed. Oil leaks from the transformer are environmentally unacceptable and a fire hazard will lead to transformer failure.
To indicate any of the above malfunctions Comem has developed a new “Buchholz” relay to comply fully with the latest CENELEC pr EN 50216-1 and 2 standards. The new relay incorporates the very latest technology in its construction and is the result of Comems 40 years experience with these products.