The main differences between overhead cables and buried cables lie in their installation methods, applicable scenarios, maintenance costs, and sensitivity to environmental impact.
Overhead cables refer to power and communication lines installed on supports such as towers and poles. Buried cables, on the other hand, are cables installed underground. These two installation methods differ, resulting in different characteristics and application scenarios.
Overhead cables are simple and practical to install, requiring no large-scale civil engineering, making them more common in areas with abundant land resources. They offer advantages such as lower installation and maintenance costs, and easier fault detection and repair. However, they are susceptible to weather conditions and external damage.
On the other hand, buried cables are more complex and costly to install due to the extensive civil engineering required. However, they are aesthetically pleasing, reliable, and pose no threat to the environment or personnel safety. Buried cables effectively prevent damage from external forces, are unaffected by weather conditions, and are suitable for urban and residential areas. Furthermore, they reduce electromagnetic radiation, minimizing interference with the surrounding environment.
1. Installation Methods:
Overhead Cables: Installed above ground, the transmission conductors are fixed to vertical poles or towers by insulators to transmit electricity.
Underground Cables: Installed underground, consisting of one or more insulated conductors covered with insulation and protective layers to ensure uninterrupted transmission of energy or information.
2. Application Scenarios:
Overhead Cables: Suitable for areas with lush vegetation, severe pollution, and frequent lightning strikes. Their structure and maintenance are relatively simple, and their cost is low, making them ideal for these environments.
Underground Cables: Widely used in power plants, substations, and densely populated urban areas where the reliability of power supply is extremely important. Their high stability and minimal environmental impact enhance the reliability of power supply.
3. Maintenance Costs:
Overhead Cables: Relatively simple to maintain and repair, with lower costs. Faults can be quickly located and repaired.
Buried Cables: Although construction costs are higher, their operation is more reliable due to their immunity to weather conditions or external environmental factors, resulting in relatively lower maintenance costs. 4. Environmental Impact
Overhead Cables: Susceptible to strong winds, lightning, snowfall, and other natural factors, which can lead to malfunctions. Furthermore, overhead line conductors are affected by temperature changes, causing thermal expansion and contraction, which can jeopardize the safe operation of the line.
Underground Cables: Unaffected by weather conditions or external environmental factors, underground cables provide a more reliable power supply. These cables typically use flame-retardant materials, possessing excellent fire resistance and effectively reducing the risk of fire.