Monitoring method of submarine cable insulation fault based on temperature field of photoelectric composite submarine cable

Abstract

The invention discloses a sea cable insulation fault monitoring method based on a temperature field of a photoelectric hybrid submarine cable. The method comprises the steps of calculating heat generation rate parameters of an armor layer and a metal shielding layer 6 according to the current-carrying capacity of the submarine cable, establishing a submarine cable temperature field model based ona thermoelectric coupling module, calculating a temperature field of the submarine cable in operation, calculating a dielectric loss factor tan delta, and evaluating the insulation status of the submarine cable. According to the method, the insulation status of the submarine cable can be effectively monitored, the monitoring is not susceptible to the influence of electromagnetic interference, through establishing a physical model, a numerical calculation method is used to solve the temperature field, the determination of a correction coefficient is not needed, the heat generation rates of thearmor layer and the metal shielding layer 6 are calculated based on an iterative method, the accuracy of a modeling calculation result is high, and the accuracy of subsequent temperature field calculation is ensured while the amount of calculation is reduced.

Description

technical field [0001] The invention relates to a submarine cable insulation fault monitoring method, in particular to a submarine cable insulation fault monitoring method based on a photoelectric composite submarine cable temperature field, and belongs to the technical field of submarine cable fault monitoring. Background technique [0002] With the development and utilization of marine resources, people pay more and more attention to marine rights and interests, and submarine power cables have been widely used. Monitoring its operating status and performing fault diagnosis are the prerequisites for subsequent fault prevention and maintenance, and are very important to ensure the safe and stable operation of submarine cables. [0003] The insulation part of the submarine cable is prone to damage, and its condition is directly related to its safe and stable operation. There is a certain development period for the decline of cross-linked polyethylene (XLPE, Cross-linkedpolye...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the submarine cable laying environment and many variable factors affecting heat transfer, the empirical formulas and parameters adopted by the IEC standard, such as calculating the thermal resistance parameters of the equivalent cable non-circular layer stranded structure and the thermal resistance of the soil, etc. , which reduces the accuracy of the calculation results to a certain extent

Moreover, the IEC standard simplifies the complex and more accurate field problem into a simpler path problem, which inevitably introduces errors

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