Grounding System in PowerStations.

Hi guys,

I need help in the grounding system for PowerStations. We have a Combined Cycle Gas Turbine Project with 2-250 MVA Gas Turbine and 1-250 MVA Steam Turbine. I have a few questions.

1. How do I design the grounding grid for the PowerStation?
2. How to compute for the max fault current and fault clearing time for the Grounding design?
3. Shall I consider the schedule of loads of the plant?
4. Is the grid for LV/MV and EHV systems separate?

I couldn't find a book which discussed the grounding systems for powerstations. Thanks for the help.

The best and most complete guide for any earthing system is the IEEE 80-2000

The Ground Bus Should be common to all the Levels of Voltage except Instrument Earthing (Clean Earthing), Refer to IEEE 80, this is a good standard for Grounding

see IEEE 837 Grounding substation

use ETAP software

or free

IEEE-80 TOOL v1.0b

hxxp://search.4shared.com/postDownload/MyFwHtWW/IEEE-80_TOOL_v10b.html