Measure tan δ The principle and significance of
Tan δ It is called the loss factor or the tangent value of the loss angle, which measures the residual angle between the current phasor and voltage phasor flowing through insulation materials under the action of an electric field. Simply put, it measures the internal energy loss of insulation materials.
Tan δ The term can be used to explain related electrical equipment such as transformers, bushings, etc. The dielectric loss value of the measured object is usually measured using a high-voltage high-frequency dielectric loss tester.
Transformer tan δ Dielectric loss test
Measuring the angle of dielectric loss plays an important role and significance in determining the insulation properties of equipment. By measuring tan δ It can be used to determine the aging and deterioration of insulation, the accumulation of oil sludge on the winding, check for bubble ionization inside, insulation layering, and reflect whether the insulation oil is dirty. It can also be used to check whether there are penetrating conductive channels in the winding. However, the following three defects cannot be detected in a timely manner.
1. Non penetrating local defects;
2. Minor insulation aging;
3. Individual insulation weak points.