Transformer oil in operation is often in high temperature (about 85 degrees Celsius), and contact with the atmosphere will occur oxidation. Some substances in oil, such as copper, accelerate the oxidation process. When oil is oxidized, the impurities such as acid and ash are broken down continuously, so that the performance of the oil is degraded. When the impurities in oil reach a certain concentration, oil sludge will be deposited, and oil sludge will accumulate in the windings, iron cores and heat pipes, which will affect the heat dissipation of the transformer. In addition, transformer oil also absorbs moisture from the atmosphere. In the above-mentioned various factors, the quality of transformer oil will gradually deteriorate (ie aging), and its insulation strength gradually reduced, so that the transformer oil aging deterioration.
The false oil level in the transformer may be caused by the following: (1) the oil gauge pipe is blocked. (2) respirator blockage. (3) airway obstruction of safety airway. (4) the film protected oil pillow does not exhaust the air when it is filling.
Thermal aging is present in all transformer oils, where the original residual oxygen is produced and the oxygen is produced when the fiber is broken down. When the operation temperature is high, the oxidation process of transformer oil is faster, which makes the viscosity increase, the color becomes deeper, the mud increases, the TG delta value increases, and the breakdown voltage decreases.
In addition, there is also the problem of electrical aging. As the pressure time increases, the breakdown voltage of the oil gap decreases. In oil immersed power transformers, partial discharges occur at high field strengths, which promote the condensation of oil molecules into more highly polymeric waxes, while escaping low molecular gases. The wax material accumulates in the winding insulation near the high field strength, blocking the oil passage, affecting the heat dissipation, increasing the gas generated, and discharging more easily.
There is a small sum above, hope to help customers, if what you do not understand or seek help please click on our official website: Shandong transformer oil http://www.jnwdsh.com or contact us, we will do our best for you to solve