Application Of Power Cables in Urban Underground Power Grids

Power cables are widely used in urban underground power grids, primarily for the transmission and distribution of electrical energy. Compared to overhead lines, underground cables offer several advantages: they require less land and occupy no surface space, offer high reliability, are minimally affected by weather and environmental conditions, and provide stable transmission performance. Because they are installed underground, power cables do not take up space above ground, thereby improving urban land-use efficiency while reducing visual pollution and safety risks. Additionally, cable systems require less maintenance and pose a lower risk of electric shock. The basic structure of a power cable consists of four components-the core (conductor), insulation layer, shielding layer, and protective layer-which ensure the safe transmission of electricity. The proportion of cables in urban underground power grids is steadily increasing, making them a vital component of modern urban power systems.