Why can't an underground system be operated above?
Understand the Problem
The question is suggesting that there is a limitation or rule regarding the operation of an underground system when it comes to activities above ground. It raises a point about the interplay between underground systems and surface operations.
Answer
Underground systems face insulation issues above 66 kV.
The underground system cannot be operated above 66 kV primarily due to insulation difficulties. Overhead systems, in contrast, can handle higher voltages up to 400 kV or more, as they use air as insulation, which is a good insulator that can handle higher voltages.
Answer for screen readers
The underground system cannot be operated above 66 kV primarily due to insulation difficulties. Overhead systems, in contrast, can handle higher voltages up to 400 kV or more, as they use air as insulation, which is a good insulator that can handle higher voltages.
More Information
When electric cables are placed underground, they require robust insulation to prevent arcing and other electrical hazards. As voltage increases, the insulation requirements also increase in complexity and cost. Overhead cables use air as insulation naturally, allowing for higher voltages without such constraints.
Tips
A common mistake is not considering the role of air as a natural, cost-effective insulator for overhead systems, facilitating higher voltage transmission compared to underground systems.
Sources
- The web page with info on - Example Source - testbook.com
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