Electrical parameter calculation method and system of power cable

Abstract

The invention provides an electrical parameter calculation method and system of a power cable. The electrical parameter calculation method of the power cable comprises the steps of acquiring an initial-end voltage, an initial-end current, a tail-end voltage and a tail-end current of the power cable; and calculating equivalent conductance of unit length and equivalent capacitance of unit length ofmain insulation of the power cable and equivalent resistance of unit length and equivalent inductance of unit length of a cable core according to the acquired initial-end voltage, the initial-end current, the tail-end voltage and the tail-end current. According to the electrical parameter calculation method provided by the technical scheme, an electrical parameter of the cable under normal runningcan be obtained by on-line monitoring of voltage signals and current signals of two ends of the power cable; and compared with a traditional calculation method, the electrical parameter calculation method has the advantages that a size parameter of the cable is not needed, and the accuracy of an actual running parameter of the obtained cable electrical parameter is higher than that of the electrical parameter obtained by calculation of a traditional theory.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a method and system for calculating electrical parameters of a power cable. Background technique [0002] The power cable is responsible for the transmission of electric energy. After the cable is put into use, it will be affected by factors such as electric field, machinery, heat and environment. The combined effect of these factors will easily cause the failure of the cable insulation. Once the cable insulation fails, the normal supply of electric energy will present a great potential safety hazard. A large number of cable operation experience shows that cable line failure is an important cause of power grid accidents. How to quickly and accurately find faults and determine the location of faults is an important issue for power cable maintenance. Traditional cable fault location often adopts power outage inspection and single-end information distance measurement. The pro...

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Problems solved by technology

[0009] The loss factor (tanδ) method is to use the current transformer and the voltage transformer to measure the current flowing through the cable insulation and the voltage applied to the cable, and then measure the tanδ value of the cable insulation through a digital measurement device; but due to the XLPE insulation tanδ The value is generally very small, making the method difficult to adopt

[0010] The tradi

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