Inverter surge insulated enameled wire with high partial discharge inception voltage and excellent thermal aging characteristics without compromising insulation performance at high temperature, by thickening the insulation layer.

The outer periphery of the conductor copper or aluminum is provided with at least one layer of enamel baking varnish, and at least one layer of extruded coating resin is arranged outside the enamel baking varnish layer, and the enamel baking varnish layer and the extrusion coating resin layer are provided. The thickness of the enamel baking paint layer is ≤60μm, the thickness of the extrusion coating resin layer is ≤200μm, and the minimum value of the extrusion tensile modulus at 25-250°C - the coating resin layer is 100MPa or otherwise, the insulation formed by the combination of the enamel baking paint layer and the extrusion coating resin layer The relative dielectric constant of the layer is lower than 3.5 at 25°C and lower than 5.0 at 250°C, while the relative dielectric constant of the enamel baking paint layer is 250°C. Inverter surge insulated wire, where the relationship between the relative permittivity (ε1') at ε and the relative permittivity (ε2') at 250°C is extruded from the covering resin layer, satisfying (ε2'/ε1') >1.

High-quality enameled wire is mainly used in
High-speed switching elements, frequency conversion motors, transformers and other electrical equipment coils. In addition, since the voltage applied to inverter-related equipment is approximately twice the inverter output voltage, inverter surge degradation of enameled wire, one of the materials constituting these electrical equipment, can be minimized.

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