What is the benefit of installing grounded shields on certain underground cables?

Grounded shields on underground cables serve several important functions, with one of the primary benefits being the prevention of eddy and circulating currents. When electrical current flows through a conductor, it can create electromagnetic fields that may induce unwanted currents in surrounding conductors or metallic structures. By installing a grounded shield, these unwanted currents can be redirected safely to ground, which reduces the risks of interference and ensures a more stable and efficient power distribution system.

This grounding also protects the integrity of the cable itself, as excessive eddy currents can lead to overheating or erosion of conductors over time. Additionally, by minimizing circulating currents, the grounded shield helps maintain proper signal integrity in communication lines that might be running in parallel.

To summarize, the installation of grounded shields on underground cables is crucial for maintaining system efficiency and safety by preventing eddy and circulating currents, which can otherwise lead to complications in both power delivery and cable integrity.