Submarine umbilical cable conductor current-carrying capacity evaluation method

Abstract

The invention discloses a submarine umbilical cable conductor current-carrying capacity evaluation method, and relates to the field of transmission submarine cable simulation. At present, the internalstructure of the submarine umbilical cable is complex, materials of all layers are different, and the performance difference is too large. When the current-carrying capacity is analyzed through simulation, simulation data are large, calculation is complex, the current-carrying capacity is troublesome to determine, and the risk that an analysis result is uncertain exists. The method comprises thefollowing specific steps: establishing a submarine umbilical cable geometric model; setting an electro-thermal coupling finite element model and material parameters; dividing finite element grids by adopting different methods and grid densities; boundary conditions, the temperature of liquid in the pipe and initial values of voltage and current loads are set; and analyzing the temperature field distribution condition under different current magnitudes, and solving and calculating whether the conductor temperature reaches the maximum allowable temperature during continuous working or not. According to the technical scheme, the defects of difficult test, difficult data collection and the like are overcome, evaluation of the current-carrying capacity of the submarine umbilical cable conductorin a conventional environment is realized, and calculation and analysis are convenient and efficient.

Description

technical field [0001] The invention relates to the field of transmission submarine cable simulation analysis, in particular to a method for evaluating the ampacity of a submarine umbilical cable conductor. Background technique [0002] my country has a long coastline, numerous islands, and frequent maritime activities. Submarine cables play a vital role in remote power supply, high-voltage power transmission and communication. In recent years, as a new product of submarine cables, submarine umbilical cables have attracted more and more attention due to their unique results and excellent performance. The ampacity of the umbilical cable refers to the amount of current that an umbilical cable passes when it transmits electrical energy. Under thermal stability conditions, when the umbilical cable's electrified conductor reaches the long-term allowable working temperature, the umbilical cable ampacity is called the long-term allowable ampacity of the umbilical cable. [0003] I...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology center, the calculation mainstream adopts the calculation standard IEC 60287 of the International Electrotechnical Commission (IEC). The formula can easily calculate the ampacity, but some algorithms are too cumbersome, and the calculation results are conservative

In addition, it only gives the calculation formula for the proximity effect of single-circuit cables, and in practice, multiple circuits are often laid in clusters

For laying forms such as pipes and tunnels, the calculation formulas given in the standards are based on empirical summaries. In practice, there are couplings of heat conduction methods such as natural convection, heat radiation, and heat conduction. Simple empirical formulas will also have certain errors.

Moreover, in the standard, for the submarine cables laid on the seabed, the accurate calculation method for the ampacity is not given

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