Requirement
For the extension of the EDF Saint Raphael source substation, EDF wished to validate the sizing of the earthing system of the substation.
Realization
CAPSIM built a numerical model of the earthing system of the installation in ETAP software.
Once validated, the model was used for the following analyses :
- Verification of the sizing of the conductors
- Calculation of the step voltages and comparison to expected normative levels
- Calculation of the global impedance level of the earthing system
- Calculation of values regarding earth potential and identification of the following limitation zones :
Earth potential
| 5000V | 1500V | 650V |
| potentiel du sol maximal acceptable afin de ne pas détériorer les équipements présents dans le poste | potentiel maximal du sol acceptable afin de ne pas détériorer les équipements des tiers | potentiel maximal du sol pour ne pas détériorer les relais téléphoniques |
Results
During this study, calculation iterations (increasing in earthing system mesh, addition of earth rods, etc...) were done in order to respect the various constraints.
The calculation report hence emitted by CAPSIM allowed the client to obtain an earthing system which was normatively correctly sized.
Touch voltage
