Q. What is a Buchholz relay?

Answer

It's not unusual for a Buchholz relay to trip for no reason. If the transformer has been turned off for an extended period of time without being checked, the oil level in the conservator may have dropped below the output of the Buchholz relay. As obvious as it is that using an open flame to test the gas in the Buchholz for the presence of short-chain hydrocarbons is a low-tech method, sometimes the simplest solutions are the best. Under fault conditions, transformer oil breaks down and releases short-chain hydrocarbons (methane, ethane, etc.). laboratory analysis of oil and gas samples constitutes au.