Cable defect identification method based on F-N curve under fixed oscillation cycle frequency

Abstract

The invention relates to a cable defect identification method based on an F-N curve under fixed oscillation cycle frequency. The method is characterized by comprising the following steps of making different types of tested defect cables; when an oscillation wave voltage is applied, keeping an effective value of the oscillation wave voltage constant; through adjusting a capacitance of a frequency modulation capacitor connected in parallel with the tested defect cables, changing an oscillation voltage frequency; when pressurization is started each time, collecting a partial discharge amount pulse number in each cycle in alpha oscillation cycle frequencies after the pressurization is started, and calculating and acquiring a single-cycle average partial discharge pulse number; according to F values and N values of different oscillation wave voltage frequency pressurization phases, drawing the F-N curves of different defect types; and through comparing characteristics of the F-N relation curves of the different defect types, identifying the different types of cable defects. A function of effectively detecting the types of the cable defects in actual engineering is realized and an identification problem of the cable defect types under an oscillation wave partial discharge test is solved.

Description

technical field [0001] The invention belongs to the technical field of cables and measurement and testing, in particular to a method for identifying cable defects based on F-N curves under a fixed frequency of oscillation. Background technique [0002] At present, urban power transmission networks basically use cable transmission lines, which have the characteristics of stable transmission performance, high safety and strong adaptability. In cable transmission lines, XLPE cables are widely used due to their good physical, chemical and mechanical properties. , its safety and reliability are directly related to the normal operation of the urban power system. As an important equipment in the power system, the insulation condition of the cable is very important to the stable operation of the power system. The evaluation of the insulation condition of the power cable is very important for the maintenance of the power grid. The safety and stability of the cable insulation is of gr...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a reasonable design, fast and accurate and reliable cable defect identification method based on the F-N curve under the fixed frequency of oscillation, and solve the problem of the type of cable defects in actual engineering. Problems with Effective Detection

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