Number and distribution of MV/LV transformation substations
From Electrical Installation Guide
Main characteristics to consider to determine the transformation substations:
- Surface area of building or site
- Power demand, (to be compared with standardized transformer power),
- Load distribution
The preferred basic configuration comprises one single substation.Certain factors contribute to increasing the number of substations (>1):
- A large surface area (> 25000m²),
- The site configuration: several buildings,
- Total power > 2500kVA,
- Sensitivity to interruption: need for redundancy in the case of a fire.
| Configuration | |||
| Characteristic to consider | 1 substation with N transformers | N substations N transformers (identical substations) | N substations M transformers (different powers) |
| Building configuration | < 25000m² | ≥ 25000m² 1 building with several floors | ≥ 25000m² several buildings |
| Power demand | < 2500kVA | ≥ 2500kVA | ≥ 2500kVA |
| Load distribution | Localized loads | Uniform distribution | Medium density |
Fig. D11: Typical characteristics of the different configurations
