Transformers Magazine, Vol. 10 No. 2, 2023.
Izvorni znanstveni članak
Dissolved gas analysis: Gas measurement techniques - Part 1
Marius Grisaru
Sažetak
DGA (Dissolved gas analysis) is a chemical method based on chemical measurements of a few
dissolved species in insulating liquids (oils). Although most of the users and diagnose-providing sources consider all DGA measurements as equal, it is important to realize that
different gas measurements of gases from oil matrices possess different advantages and disadvantages. The calibration is sometimes overestimated for several techniques and sub- estimated for others. Also, the linearity and range of factor response should be observed, known, and estimated before trying to use complex diagnostic models. The extrapolation approach is not recommended for DGA, not for the range, and not for substance, meaning that
if a measurement is obtained from one specific matrix, any slight alteration of basic matrix composition may easily affect the DGA measurements. Although today users may find many types of gas measurements in their DGA system, it is necessary to mention only those that are very specific.
Gas chromatography is the only method that is standardized, meaning controlled, and
periodically tested. Even in the case of some public standardization, regulations and limited processes, there are those compulsory for the quality of measurements. It is similarly important to stick to regulated processes for all electrical industries such as power supply or any other crucial domain.
Ključne riječi
phase diagrams, water, organic liquids, boiling temperature, measurement techniques
Hrčak ID:
300156
URI
Datum izdavanja:
13.4.2023.
Posjeta: 209 *