Abstract
In recent years, with the rapid development of large-length ultra-high-pressure voltage extrusion insulated submarine cable technology, the cable system in the medium-length offshore power grid interconnection project has been gradually replaced by XLPE insulation by traditional oil-paper insulation. There are many large cross-section conductors used in long-distance power transmission cables, and according to the IEC 60287-1-1, it is recommended to use Milliken conductors to reduce the AC resistance of conductors, at the same time, in submarine cables, there is a high requirement on the water-blocking performance of conductors and the water resistance of Milliken conductors is poor, so it is not used in submarine cable conductors. This paper puts forward a layering enamelled stranded conductor and a calculation method of AC / DC resistance ratio for it. The validity of the calculation method is verified by experimental tests. At the same time, the calculation shows that the AC / DC resistance of the conductor at 1800 mm2 nominal cross section can be reduced by 16% compared with the conventional round compacted conductor in the prior art. The effectiveness of this conductor in reducing AC resistance is verified by finite element simulation.
Highlights
IntroductionThe engineering application of large-length ultra-high voltage cross-linked polyethylene insulated (XLPE) submarine cable technology can eliminate the marine leakage of oil-filled cables and the protecting forests anxiety, and has the advantages of environmental protection, high reliability and low cost
The engineering application of large-length ultra-high voltage cross-linked polyethylene insulated (XLPE) submarine cable technology can eliminate the marine leakage of oil-filled cables and the protecting forests anxiety, and has the advantages of environmental protection, high reliability and low cost.Some experts and scholars at home and abroad have studied the AC resistance characteristics of conductors with different structures
This paper presents a calculation method of conductor AC resistance based on radial conductance fitting of conductor stranded monofilaments
Summary
The engineering application of large-length ultra-high voltage cross-linked polyethylene insulated (XLPE) submarine cable technology can eliminate the marine leakage of oil-filled cables and the protecting forests anxiety, and has the advantages of environmental protection, high reliability and low cost. Some experts and scholars at home and abroad have studied the AC resistance characteristics of conductors with different structures. Many scholars use complicated models and complicated electromagnetic field formulas to calculate the AC resistance of segmented cable conductors, as in K. The file 272 of CIGRE B1.03[2] working group gives a detailed introduction about the theoretical calculation, finite element simulation and actual measurement of ks for the split conductors with various monofilament surface states. As of there is no literature to report the calculation method of AC resistance and the distribution of conductor currents of insulated stranded round conductors with layered enameled wires. This paper presents a new low AC resistance conductor that is compatible with the traditional cable insulation structure and has the same appearance. The current distribution under the alternating electric field of the conductor is analyzed though finite element simulation
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