Simulation analysis method for temperature distribution of optical fiber composite undersea cable during earth faults
A submarine cable and grounding fault technology, applied in design optimization/simulation, electrical digital data processing, special data processing applications, etc., can solve problems such as inaccurate analysis results, complex calculations, complex submarine cable structures, etc., to overcome the physical test The effect of high cost and convenient calculation and analysis
Active Publication Date: 2017-08-18
ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER +2
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The structure of the submarine cable is complex, and the material difference of each layer is too large. When the simulation analysis is used for simulation, the amount of data is large, the calculation is complicated, the analysis of the temperature distribution is extremely troublesome, and there is a risk of inaccurate analysis results.
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[0041] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0042] Such as Figure 11 Shown, the present invention comprises the following steps:
[0043] 1. Establish the geometric model of submarine cable ground fault
[0044] The ZS-YJQF41 type 36 kV three-core XLPE insulated optical fiber composite submarine cable is used, which is made of three identical conductive cores, two optical units and outer materials. The cross section of the submarine cable is shown in Figure 1 (a). The core section is shown in Figure 1(b); the light unit section is shown in Figure 1(c).
[0045]The conductive cores are arranged in the shape of "pin" in the submarine cable, and from the inside to the outside are the water-blocking copper conductor 6, the conductor shield 7, the XLPE insulation 8, the insulation shield 9, the semi-conductive resistance water layer 10, and the lead alloy sheath 11 , asphalt an...
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The invention discloses a simulation analysis method for temperature distribution of an optical fiber composite undersea cable during earth faults and relates to the field of fault simulation analysis. At present, an undersea cable has a complex structure, and huge difference exists among various layers of materials; when simulation is performed by adopting simulation analysis, the conditions of large data volume, complex calculation, extremely-tedious analysis of a temperature distribution rule and accurate analysis results possibly occur. The simulation analysis method comprises the following steps: establishing a geometrical model of the earth faults of the undersea cable; setting the type of an electrothermal coupling finite element unit and material parameters; dividing finite element meshes by adopting multiple methods; setting seabed boundary conditions and voltage and current loads; analyzing temperature distribution data and a time varying rule after the earth faults occur. According to the technical scheme, the defects of a full-scale experiment that experimental cost is high, implementation is difficult to realize, data are difficult to acquire and the like are effectively overcome, simulation of the earth faults of the undersea cable is efficiently realized, and temperature distribution and the time varying rule of all layers of structures of the undersea cable when the faults occur are obtained; in addition, convenience and quickness in calculation and analysis are realized.
Description
technical field [0001] The invention relates to the field of fault simulation analysis, in particular to a temperature distribution simulation analysis method for a grounding fault of an optical fiber composite submarine cable. 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, three-core submarine cables have been widely used in submarine distribution networks, and the most widely used ones are cross-linked polyethylene (XLPE) three-core optical fiber composite submarine cables. However, the submarine cables in actual operation are buried under the seabed and have been subjected to seawater erosion and erosion for a long time, which can easily cause the water resistance performance of the submarine cable to deteriorate, which in turn leads to electrical failures such as insulation defec...
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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/08
Inventor 陈振新林晓波汪洋陈国志高震卢志飞李世强张磊张娜飞吕安强
Owner ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER
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