Dielectric loss factor of oil products of insulating oil filter
2018/5/17 Viewers:
Insulating oil is a dielectric, an insulator that can withstand electrical stress. Under the action of alternating electric field generated by alternating current circuit, it will only pass weak capacitive current in the medium. It has an angle of 90 degrees ahead of the applied voltage, so it is reactive current, which only affects the power factor of the electrical equipment and does not generate power loss. But in fact, because of the internal charge imbalance in the oil, or the polar molecules produced by the surface of the electric field, they will act as conductors and lead to the conductive current of the resistive, or leakage current. The current is in phase with the applied voltage, so it is a active current, which can cause power loss, which is called "dielectric loss" of insulating oil, the ratio of conduction current to capacitance current, that is, the greater the loss factor of TGD is called "dielectric loss factor", the higher the power loss of oil is. That is, the loss power of oil is directly proportional to the tangent value of dielectric loss angle. In other words, the insulation characteristics of the oil are determined by the tangent value of the dielectric loss angle, so the dielectric loss of the insulating oil is usually expressed as a loss of the loss power and the tangent value TG0 of the dielectric loss angle.
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