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According to constructional feature a substation can be classified as
Outdoor substation
Indoor substation
Pole mounted substation
All of above
All of above
Substations are classified based on their constructional features, operational voltages, and service requirements. The classification into outdoor, indoor, and pole-mounted types depends on the environmental setting, equipment size, and voltage levels.
Substations are classified based on their constructional features, operational voltages, and service requirements. The classification into outdoor, indoor, and pole-mounted types depends on the environmental setting, equipment size, and voltage levels.
VlineтАЛ=3тАЛVphaseтАЛ тАФ fundamental relationship for high voltage substation transmission systems.
Outdoor substations are used for voltages above 66kV where large spacing between live parts is mandatory. Indoor substations are preferred in densely populated urban areas for medium voltages (up to 11kV) to save space and ensure safety. Pole-mounted substations are specialized outdoor structures used primarily for distribution transformers (typically up to 100 kVA) in rural or semi-urban areas to reduce civil infrastructure costs.
Outdoor substations are ideal for high-voltage transmission lines (66kV and above).
Indoor substations use gas-insulated switchgear (GIS) to minimize footprint in city centers.
Pole-mounted units are cost-effective for localized low-voltage distribution.
Selection is governed by availability of land, voltage level, and local environment.
Outdoor: Lower initial cost due to less civil work.
Indoor: Protection against atmospheric pollution and weather conditions.
Pole-mounted: Minimal land acquisition required.
Outdoor: Requires large space and equipment is exposed to environmental factors.
Indoor: High maintenance and construction costs compared to outdoor types.
Pole-mounted: Limited capacity and safety concerns.
Outdoor: Bulk power transmission and grid interconnection.
Indoor: City power supply and industrial plants.
Pole-mounted: Distribution to rural villages and small housing colonies.
Indoor substations typically operate at voltage levels тЙд33kV due to insulation clearance requirements.
Option D is the correct choice as all listed types are recognized categories in electrical power distribution engineering.
D is correct тАФ Substations are categorized into indoor, outdoor, and pole-mounted types based on their construction and environmental installation requirements.
Always recall that insulation clearance distances increase exponentially with voltage, which is why EHV (Extra High Voltage) substations are exclusively outdoor.