Testing method of high-voltage cable oscillatory wave partial discharge testing machine

Abstract

The invention discloses a test method of a high-voltage cable oscillatory wave partial discharge test machine, which comprises the following steps: step 1, firstly boosting by a DC transformer in the discharge test machine, switching on an electronic switch when the voltage is boosted to a test voltage, generating resonance with a tested cable capacitor through an inductance device, generating damped oscillation at the end of the tested cable, and starting the electronic switch when the voltage is boosted to the test voltage; a partial discharge signal is obtained by combining an oscillatory wave circuit and a capacitive voltage divider on a test cable, a positioning result is displayed after positioning is performed according to the partial discharge signal and a discharge quantity value, a cable partial discharge detection positioning process is simulated based on an oscillatory wave method, the simulation cost is low, the efficiency is high, experiments and training are performed in an electric power system simulation platform, and the simulation accuracy is high. The method is suitable for being widely popularized and used, the safety operation and maintenance technology level of cables of our companies is improved in a more economical mode, sudden faults of cable operation are prevented, and guarantee and support are provided for improving economic benefits and social benefits of the companies.

Description

technical field [0001] The invention relates to the technical field of cable testing, in particular to a testing method of a high-voltage cable oscillating wave partial discharge testing machine. Background technique [0002] With the continuous development of my country's economy and the continuous expansion of urban construction, the electricity load is also increasing. At present, the proportion of power cables used in my country's power transmission and distribution systems continues to increase. The XLPE cable has the advantages of good insulation performance, good heat dissipation performance and mechanical performance, and high power supply reliability. With the development of the high-voltage field, in order to ensure the safe operation of high-voltage cables, industry regulations have proposed handover test standards, and the AC withstand voltage test is a test method that must be performed at present. [0003] The AC withstand voltage test is a handover test meth...

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Problems solved by technology

[0003] The AC withstand voltage test is a handover test method stipulated in the national standard. It mainly adopts the series frequency conversion resonance withstand voltage test method, which has been widely used. degree, or the leakage current is too large, which will seriously affect the accuracy of the test structure

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