Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line
A power cable and characteristic technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring electrical variables, etc., can solve problems such as system influence, difficulty in realization, background interference, etc., and achieve the effect of preventing accidents
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[0071] The embodiments of the present invention will be further described below in conjunction with the drawings.
[0072] A method for judging the online insulation characteristics of XLPE power cables. Its analysis basis is the thermal circuit model of the power cable. The structure of XLPE power cable (cross-linked polyethylene insulated cable and cable) is as follows figure 1 As shown, the power cable includes a conductor 1 and an outer sheath 8. Between the conductor 1 and the outer sheath 8, a conductor shield 2, an insulating layer 3, an insulating shield 4, a metal shield 5, and an inner Lining layer 6, armor layer 7. The main heating element in the power cable is the conductor. In addition, the various losses of the cable itself are eventually emitted in the form of heat, such as dielectric loss, metal shielding loss, and armor loss. Therefore, the heat source in the thermal circuit model of the power cable should be Including conductor power loss, dielectric loss, met...
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