Abstract

To clarify the accuracy of calculation results between thermal analysis and finite element simulation. 525 kV XLPE insulated cable with copper conductor cross-section of 3000mm2 was selected for model. The current rating capacity of HVDC cable was calculated based on thermal analysis and finite element simulation respectively, then verified by DC current loading test. The calculation current rating capacity of HVDC cable with corrugated aluminum sheath based on thermal analysis was 2836 A, which is 5.3% smaller than that based on finite element simulation and 8.6% smaller than that based on DC current loading test. For thermal analysis, the main reason of smaller current is that only thermal resistance influence of cable heat conduction is considered. This method can’t calculate heat radiation from external air convection which affects current rating capacity. In addition, the influence of internal air in the cable for heat transfer also can’t be taken in consideration. Besides heat conduction, finite element simulation has the ability to recognize thermal radiation effects. So, the calculation results based on finite element simulation are close to testing results. The main deviation is from air intervals insides cable construction and the design of corrugated aluminum sheath. Besides, the finite element simulation can’t simulate the heat radiation on the cable surface caused by air circular during test accurately.

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