What is transformer dielectric loss?

Dielectric loss in transformers refers to the energy loss caused by the hysteresis effect of dielectric conductivity and polarization on the insulation material inside the transformer under the action of an electric field. This type of loss, also known as dielectric loss or dielectric loss, is one of the important indicators for measuring the insulation performance of electrical equipment. The magnitude of dielectric loss can be characterized by the tangent value of dielectric loss angle (tg δ), which reflects the process of insulating materials converting electrical energy into thermal energy under the action of an electric field.
The purpose of testing transformer dielectric loss is to determine the insulation condition of electrical equipment by measuring the dielectric loss value, which is a traditional and highly effective method. The decrease in insulation capacity directly reflects an increase in dielectric loss, and further analysis can be conducted on the reasons for insulation decline, such as insulation moisture, insulation oil contamination, aging and deterioration, etc.
The increase in transformer dielectric loss may be caused by various reasons, including aging of transformer oil, moisture and impurities in the oil, temperature rise of the oil, oxidation of the oil, excessive electric field strength, gas in the oil, improper operation and maintenance, equipment failure and damage, etc. In order to reduce the increase of medium loss, it is necessary to regularly inspect and maintain the quality of transformer oil, timely replace aged oil and treat pollutants in the oil, keep the oil dry and clean, and control the operating temperature of the transformer.
The ways to reduce transformer dielectric loss include optimizing transformer structure, environmental conditions, and material selection, which can effectively reduce dielectric loss, improve transformer operating efficiency, save energy, and reduce system costs.