Composite sea cable current-carrying capacity calculating method

Abstract

The invention discloses a composite sea cable current-carrying capacity calculating method. The method comprises establishing a geometrical model; outputting physical property parameters of composition materials; performing grid division and establishing a finite element model of a photoelectric composite sea cable; setting value ranges of environment temperatures and heat convection coefficients, an initial environment temperature, an initial heat convection coefficient, a photoelectric composite sea cable working current; calculating temperature field distribution of the photoelectric composite sea cable and acquiring the conductor temperature and the optical fiber temperature in the photoelectric composite sea cable; determining whether |TC-t| is larger than epsilon or not, determining whether TC-t is larger than 0 or not; storing the environment temperatures, the heat convection coefficients, the current-carrying capacity and the optical fiber temperature to a current-carrying capacity database; adjusting the parameters so as to enable the heat coefficient h to be equal to h2; adjusting the parameters so as to enable the environment temperature T to be equal to T2; and calculating the current-carrying capacity of the photoelectric composite sea cable at the optical fiber temperature. The method can flexibly and dynamically adjust the current-carrying capacity of the photoelectric composite sea cable according to season changes and environmental condition changes so that the capability of transmitting electric energy of the photoelectric composite sea cable can be exerted to the utmost.

Description

technical field [0001] The invention relates to a technology for real-time temperature monitoring of a photoelectric composite submarine cable, in particular to a method for calculating the dynamic carrying capacity of a photoelectric composite submarine cable. Background technique [0002] The photoelectric composite submarine cable is responsible for providing power supply and communication between various platforms in offshore oil exploitation. It is the lifeline of each platform, and its safety status is very important to ensure the normal operation of each production platform. Therefore, how to reasonably determine the ampacity of the optoelectronic composite submarine cable on the premise of ensuring its long-term safe and reliable operation is of great significance. [0003] At present, the calculation of cable ampacity is generally based on the IEC60287 standard, but this standard only meets the calculation of ampacity under simple environmental conditions. When the ...

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Problems solved by technology

[0003] At present, the calculation of cable ampacity is generally based on the IEC60287 standard, but this standard only meets the calculation of ampacity under simple environmental conditions. When the actual cable laying environment is different from its set benchmark parameter values, a large number of tests are required. There are certain limitations in determining the corresponding correction coefficient

And IEC60287 does not mention the calculation method of the current carrying capacity of the photoelectric composite submarine cable

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