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Dissolved gas analysis (DGA) is a technique used to determine the concentration and type of gases present in oil or other fluids. DGA is primarily used in the power industry to monitor the health of transformers. It can also be used in other applications such as hydraulic systems and gas insulated switchgear. DGA is a critical tool for preventing transformer failures and minimizing downtime, making it an important aspect of power system maintenance.
Transformers are crucial components in the power grid, converting high-voltage electricity into lower-voltage electricity for distribution to homes and businesses. However, transformers are also susceptible to failure, which can result in costly downtime and even safety hazards. Transformer failures can be caused by a variety of factors, including overheating, overloading, and electrical faults. However, one of the most common causes of transformer failure is the buildup of gases within the transformer oil.
When a transformer begins to fail, it will generate gases such as hydrogen, methane, ethane, and ethylene. These gases can be dissolved in the transformer oil and will accumulate over time. By monitoring the concentration and type of gases present in the oil, DGA can detect the early stages of transformer failure before it becomes a major problem.
DGA works by extracting a sample of the transformer oil and analyzing it for the presence of dissolved gases. The sample is typically collected using a sampling valve, and the analysis is performed using gas chromatography. The results of the analysis are then compared to a set of standards to determine if the transformer is operating within normal parameters or if it requires maintenance.
In Dissolved Gas Analysis, the most common problem of the complex gas mixture analysis is the separation of H2, O2, CO and CO2 mixture without requiring multiple injections and analyses (this complexity is recorded even by ASTM). The Mayura Analytical DGA-II has proved to be the most economical solution for the analysis of H2, O2, N2, CO, CO2, CH4, C2H2, C2H4 and C2H6 mixture using a single injection technique. The column switching mechanism has ensured that the analysis to detect very low to very high PPM levels can be achieved at the press of a button on the sample injection.
The Mayura Analytical DGA Gas Chromatograph comes with both TCD and FID detectors and built in Methanator to measure low concentrations starting with 10 PPM. After the dissolved gas is extracted using our setup, a single shot injection technique is used for the analysis of H2, O2, N2, CO, CO2, CH4, C2H2, C2H4 and C2H6 mixture. The dual column with dual detection technology turns the complexity of analysis into simplicity. The automatic column switching mechanism ensures that columns are selected automatically to analyses the right gases using the right column.
Check out more details about our DGA Gas Chromatograph here
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