neduet said:
neduet said:
The number of earthing rods needed for a 132kV switch yard depends on several factors such as soil resistivity, fault current, and the desired level of protection. Conducting a thorough site survey and calculation based on these factors can help determine the optimal number of earthing rods for the switch yard.
The length of earthing rods for a 132kV switch yard should be determined based on the depth of the soil and the required grounding resistance. Generally, a length of 8-10 feet is recommended for effective grounding in most soil conditions.
Using multiple shorter earthing rods can be an effective alternative to using one long rod. However, it is important to ensure that the rods are properly interconnected and spaced out to achieve the desired grounding resistance.
Copper and galvanized steel are commonly used materials for earthing rods in a 132kV switch yard. These materials have high conductivity and corrosion resistance, making them ideal for use in grounding systems.
Earthing rods should be inspected and maintained at least once a year to ensure their effectiveness. However, if there are any changes in the soil conditions or the switch yard's electrical system, more frequent inspections may be necessary to ensure proper grounding.