Abstract
Power cable lines are usually buried in the ground. However, in some cases, their ending sections are mounted along the supports of overhead lines. This leads to a situation where the cables are exposed to direct solar radiation and, consequentially, overheat. The paper presents the advanced computer modelling of power cables’ heating, considering their insolation as well as the effect of wind. The temperature and current-carrying capacity of power cables—during exposure to direct solar radiation—are evaluated. An effective method of limiting the unfavourable impact of the sun is discussed. In the presence of solar radiation, the proposed method enables a significant increase in the power cables current-carrying capacity.
Highlights
One of the most important parameters of power cable lines is their current-carrying capacity.The rated load of the power cable line, in given external conditions, should not result in the temperature of cables being higher than the maximum permissible temperature specified in the standard
Power cables located in free air can be exposed to wind and solar radiation
The riskiest configuration of the power cable line is the case in which almost the entire length of the line is buried in the ground, but at some cable line is the case in which almost the entire length of the line is buried in the ground, but at some
Summary
One of the most important parameters of power cable lines is their current-carrying capacity. The current-carrying capacity values determined on the basis of these standards are divergent in comparison with the current-carrying capacity based on the experience and numerical calculations [3,14,15,16,17,18] This is especially important in the case of the complicated layouts of cable systems or in the presence of unfavourable environmental conditions. The impact of bare windconductor direction of and speed on the turn, the author of the paper [21] presents an analysis of the current-carrying capacityofofthe anoverhead overhead current-carrying capacity of conductors This applied to one bare conductor line in of the impact of wind and solaranradiation analytical formulas, butofdoes line. The authors’ capacity proposal of is economically attractive because it doesisnot require an attractive because it does not require an additional power supply and, does not consume additional power supply and, does not consume energy for the intensification of the favourable energy along for thethe intensification airflow channels. of the favourable airflow along the channels
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