Current-carrying capacity and temperature simulation method for high-voltage alternating-current submarine cable

Abstract

The invention relates to a current-carrying capacity and temperature simulation method for a high-voltage alternating-current submarine cable. Through establishing a submarine cable multi-physical coupling simulation model based on an electromagnetic field, a heat transfer field and a fluid field, a calculation method for calculating the temperature and current-carrying capacity of a submarine cable is provided. The current-carrying capacity and temperature simulation method is based on an electricity-heat-flow multi-physical field coupling equation, is used for monitoring a temperature fieldand current-carrying capacity of the submarine cable by combining with actual laying conditions of the submarine cable, and can perform monitoring and analysis on the operation condition of the submarine cable more conveniently; an APP based on COMSOL simulation can meet the requirements of users to the maximum extent; and an operator can set different parameters according to different conditionsof the submarine cable to obtain the temperature field and the current-carrying capacity of the submarine cable. The current-carrying capacity and temperature simulation method and system overcome thedefects that a submarine cable entity experiment is high in cost, difficult to implement, difficult to measure data and the like, efficiently realizes simulation calculation of the temperature and current-carrying capacity of the submarine cable, and have important significance in guaranteeing completely reliable operation of a power grid and stable operation of the submarine cable.

Description

technical field [0001] The invention relates to the technical field of electrical equipment simulation measurement, and more specifically, to a simulation method for ampacity and temperature of a high-voltage AC submarine cable. Background technique [0002] The power cable is an important part of the power system and bears the responsibility of power transmission. Cables are divided into land cables and submarine cables according to their use environment. Terrestrial cables are widely used in power transmission and distribution systems, especially urban power grids with urban landscape requirements. Submarine power cables are commonly used to power offshore islands, offshore oil rigs and offshore lighthouses. Offshore wind farms are located offshore and require high-capacity, long-distance transmission lines to deliver power to dense areas where power loads are concentrated. Overhead transmission lines are obviously not suitable, but submarine power cables are the best o...

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Problems solved by technology

[0004] At present, the research objects of existing cable temperature and ampacity methods mainly focus on the temperature field analysis and ampacity calculation of AC land cables. Most of the calculation methods are based on IEC-60287 standard thermal circuit analysis or temperature field numerical calculation; There are few studies on environmental factors, and the submarine cable laying environment is harsh, the line span is large, and the differences in marine hydrology, geology, and climate temperature in the routing area may be large. The IEC-60287 standard makes a single, uniform assumption

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