Abstract
Control of the formation and behavior of water in a liquid dielectric during the operation of high-voltage equipment is of paramount importance because water provokes intensive oxidation and aging of the entire oil-solid insulation system. The electrophoretic ability of water has a strong effect on the insulating properties of dielectrics inside a high-voltage apparatus, and, in general, on its uninterrupted long-term operation. Problems associated with the determination of moisture in the complex hydrocarbon matrix of transformer oil by all available methods are considered. It is shown how different states of water in transformer oil of various grades can be determined by varying the temperature in the evaporator of the chromatographic unit. Chromatographic data are compared with data obtained by conventional methods (Karl-Fischer coulometric titration, calcium-hydride method, coulometric sensor based electrolysis).
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