Submarine cable impulse voltage testing device and testing method

The testing device, consisting of a DC generator, an impulse voltage generator, and a control resistor, solves the problems of high cost and long cycle in high-voltage DC submarine cable impulse voltage testing, and realizes rapid and low-cost research on the electrical characteristics of submarine cable samples under impulse voltage.

CN121633752APending Publication Date: 2026-03-10ELECTRIC POWER RES INST OF GUANGDONG POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-24
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

Existing high-voltage DC submarine cable impulse voltage testing equipment is expensive and has a long testing cycle, making it difficult to quickly and cost-effectively study the electrical characteristics of the insulation system under impulse voltage in the laboratory.

Method used

A test device consisting of a DC generator, an impulse voltage generator, a first control resistor, and a DC blocking capacitor is used to measure the time interval between voltage rise to peak value and the overvoltage decay time by applying DC voltage and impulse voltage. Combined with the heater to simulate the operating temperature, the impact resistance strength of the cable insulation is calculated.

Benefits of technology

This technology enables rapid and low-cost overvoltage testing of submarine cable samples in the laboratory, allowing for faster research into the electrical characteristics of insulation systems under impulse voltage, and reducing testing costs and time.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of submarine cable testing, in particular to an impulse voltage testing device and method for a submarine cable. The impulse voltage testing device for the submarine cable comprises a direct current generator, an impulse voltage generator, a first control resistor and a blocking capacitor. The DC generator is used for applying DC voltage to the to-be-tested sample; the impulse voltage generator is used for applying impulse voltage to the to-be-tested sample; the first control resistor is used for measuring a time interval when the voltage of the to-be-measured sample rises to a peak value; the blocking capacitor is used for measuring the overvoltage decay time. According to the invention, the impulse voltage generator applies the impulse voltage to the to-be-tested sample, and the first control resistor and the blocking capacitor are used to measure the time interval when the voltage of the to-be-tested sample rises to the peak value and the overvoltage decay time. According to the invention, an overvoltage test can be carried out on a sample of an insulation sheet or a cable in a laboratory, so that the electrical characteristics of an insulation system experiencing such unusual waveforms can be researched more quickly and at lower cost.
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