Transformer oil as an important mineral oil is widely used in power equipments and its fundamental properties can be obviously presented by the vapor pressure which is difficult to be accurately evaluated due to its complex compounds. According to the testing mechanism of thermal balance, a simple method is proposed to evaluate the vapor pressure of transformer oil at various temperatures. The thermal stability and chemical components of the tested oil are characterized and discussed. The experiment data correlation to the vapor pressure of transformer oil is further performed by the typical Clausius-Clapeyron equation. It reveals that the vapor pressure of transformer oil is positively related to temperature environment. Moreover, a deep comparison between the experiment data and the correlated result confirms that the applied evaluating method is a suitable way to evaluate the vapor pressure of transformer oil and other liquid compounds system.
The 3D model of the oil-paper insulated transformer was constructed by SOLIDWORKS and simulated by Moldflow to optimize its vacuum-degassing technology. The number of the inside oil papers, the space of the adjacent two oil papers, the number and its distribution of the setting oil inlets are discussed in detail and the variation of the relevant formed air bubbles are analyzed. It reveals that the pouring process and the residual air bubbles are seriously influenced by the number and the space of the oil papers. In order to exhaust the inside air, the reserved oil inlets should be set symmetrically on the top of the transformer. Furthermore, the formation mechanism of the residual air bubbles is proposed.
The oil-paper transformer is widely used as the common insulating device in the electrical industry. The transformer with the reserved primary coil and the secondary coils was filled with the transformer oil by the vacuum pouring process. Its insulating property was tested by the partial discharging (PD) system and the testing results are analyzed in detail. The experiment data reveals that the insulating properties of transformer at different positions are diverse due to the specific oil-paper structure. Obviously, the outer part of the transformer shows a much higher insulating property than its inner part. This confirms the residual air or defects are mostly concentrated in the inner part and air in the outer part is easier to be degassed by a viable vacuum pouring technology.
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