Performance parameters of German standard transformer bushing

Performance parameters of German standard transformer bushing

The tangent value of dielectric loss angle (tan δ) is one of the important indicators reflecting the insulation performance of casing. German standard casing usually requires a tan δ value within a certain range, generally less than or equal to 0.5%, to ensure that the energy loss of the insulation material under alternating electric fields is small, and to avoid insulation aging or damage caused by heating.

Creepage distance: Different requirements for creepage distance are specified based on the pollution level of the usage environment. For example, in lightly polluted areas, a creepage distance of 20mm/kV may be required; In heavily polluted areas, higher requirements are required, such as 25mm/kV or 31mm/kV, to prevent contamination flashover accidents on the surface of the casing.