On-line monitoring method for submarine cables

Abstract

The invention provides an on-line monitoring method for submarine cables. The method includes the steps of building a fault diagnosis model according to pressure field information, temperature field information, electric field information and the fault type when the submarine cables fail; distributing distributed optical fiber sensors for the submarine cables coaxially; monitoring and obtaining the pressure field information, the temperature field information and the electric field information of the submarine cables through the distributed optical fiber sensors; and determining whether the submarine cables fail and the type of faults according to the pressure field information, the temperature field information, the electric field information and the fault diagnosis model of the submarine cables. The method can perform accurate state on-line monitoring on the submarine cables and obtain state parameters of the submarine cables for fault diagnosis, and is provided with good identification degree.

Description

technical field [0001] The invention relates to the field of electric power safety monitoring technology, in particular to an on-line monitoring method of a submarine cable. Background technique [0002] The development of offshore energy such as offshore wind power has promoted the formation of offshore transmission networks, and high-voltage submarine power cables have increasingly broad application space, mainly including offshore wind power transmission, power supply for offshore oil and gas platforms, island networking, and coastal country networking. As the most important equipment in the offshore transmission network, the safe operation of submarine cables is very important to the power system. [0003] The quality of cable insulation is a key factor affecting the safe and reliable operation of cables. In the past, the widely used preventive measure was to use periodic power outages for detection, which belonged to offline detection. This preventive detection of ins...

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Problems solved by technology

This preventive detection of insulation is obviously unreasonable: first, the power must be cut off for detection, which often results in interruption of power supply; second, it cannot be selectively detected according to the cable insulation status, and all cables are often detected. As a result, cables with intact insulation undergo multiple testing processes, resulting in accelerated deterioration of the cable insulation performance; third, when testing, a high voltage higher than the operating voltage is often applied to the cable insulation, which will accelerate the deterioration of the cable insulation

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