Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Capital cost of outdoor substation compared to indoor substation for the same rating is
Low
High
Same
None of above
Low
The capital cost of an outdoor substation is significantly lower than that of an indoor substation for the same power rating because outdoor installations do not require expensive building structures for housing the electrical equipment.
The capital cost of an outdoor substation is significantly lower than that of an indoor substation for the same power rating because outdoor installations do not require expensive building structures for housing the electrical equipment.
CtotalтАЛ=CequipтАЛ+CcivilтАЛ+ClandтАЛ тАФ Total cost equation where CcivilтАЛ is significantly higher for indoor types.
S=VLтАЛILтАЛ3тАЛ тАФ Rating of the substation (MVA/kVA).
Outdoor substations utilize air as the primary insulation medium for busbars and equipment, which requires larger clearances between live parts. Since the equipment is designed for atmospheric exposure, the massive civil costs associated with indoor housing, forced ventilation, and elaborate fire suppression systems are eliminated, significantly reducing the initial investment.
Outdoor substations require more land area due to larger phase-to-phase and phase-to-ground clearances.
Indoor substations are preferred in urban areas where land cost is extremely high and environmental protection is required.
Maintenance cost for outdoor equipment is often higher due to exposure to weather, pollutants, and birds.
Low capital expenditure
Expansion is easier and more flexible
No complex building ventilation required
Requires large land area
Exposure to atmospheric pollution and moisture
Higher risk of failure due to wildlife or environmental hazards
Generation stations
EHV transmission systems
Rural distribution substations
| Feature | Outdoor | Indoor |
|---|---|---|
Civil Structure | Minimal | Extensive (Building) |
Space Required | High | Low |
Cost | Low | High |
For voltages above 66 kV, indoor substations are technically and economically impractical due to insulation requirements.
Option B (High) is the correct cost relative to indoor units, making it wrong for this specific query.
A is correct тАФ The capital cost for an outdoor substation is lower because it avoids the need for extensive structural building work required for indoor counterparts.
Always remember that while outdoor substations have lower capital costs, they generally require more land, making them unsuitable for congested urban environments.