Since the presence of the dissolved gases reveals the faults of a transformer, these gases are also known as Faulty Gases. Examples of the faulty gases are:
- Inert Gases: Hydrogen, Nitrogen, Oxygen, Carbon Dioxide & Carbon Monoxide
- Hydrocarbons: Acetylene, Ethylene, Ethane. Methane
Several test methods are available to measure the dissolved or faulty gases in transformer oil:
- IEC 60567 based on an Oil-Filled Electrical Equipment for the Sampling of Gases and of Oil including a gas chromatographic analysis of Free and Dissolved Gases
- ASTM D3612-C based on a Gas Chromatographic analysis combined with a Headspace Sampler
The DVLS TOGA analyzer complies with IEC 60567 & ASTM D3612-C to extract and measure gases dissolved in electrical insulating oil and to identify the individual gas component extracted.