DGA is the single most comprehensive asset condition assessment and management tool for an oil-filled power transformers. Dissolved Gas Analysis (DGA) is a powerful diagnostic tool used to monitor the health of transformers and other oil-filled electrical equipment. The technique involves analyzing the gases dissolved in the transformer oil to identify and quantify any abnormal by-products of electrical and thermal stress.
Purpose of DGA
• To provide a non-intrusive means to determine if a transformer incipient fault condition exists or not
• To have a high probability that when entering a transformer a problem is apparent
• To prevent an unexpected outage
• To reduce risk to the unit, to the system it connected, to the company and most of all to the personnel monitoring that transformer.
DGA Application
• Oil immersed transformer
• Oil immersed shunt reactors
• Oil type OLTC, Regulators
• Oil circuit breakers
• Oil type instrument transformers (CT,PT)
Gas Analyzed by DGA
The total analysis of seven gas components dissolved in insulating oil can be completed by one injection(H2, CH4, C2H2, C2H4, C2H6, CO, CO2), if necessary can do full analysis of nine components (H2, O2, N2, CH4, C2H2, C2H4, C2H6, CO, CO2). The minimum detection concentration of acetylene reached 0.05ppm, and the stabilization time was less than 40 minutes.