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Substations cab be classified according to
Service requirement
Constructional features
Both (a) and (b)
Neither (a) or (b)
Both (a) and (b)
Substations are categorized based on their functional role (service requirement) and their physical layout (constructional features). This dual-classification system ensures optimal design based on transmission needs, voltage levels, and geographical constraints.
Substations are categorized based on their functional role (service requirement) and their physical layout (constructional features). This dual-classification system ensures optimal design based on transmission needs, voltage levels, and geographical constraints.
VsтАЛ=VrтАЛ+I(R+jX) тАФ Basic power substation voltage regulation concept
P=3тАЛVLтАЛILтАЛcos╧Х тАФ Power handling capacity calculation for a substation
Substation classification relies on two primary parameters: 1) Service requirement (e.g., step-up, step-down, switching, or converter substations) which dictates the transformer configuration and primary duty; 2) Constructional features (e.g., outdoor, indoor, underground, or GIS) which dictate the insulation level, spacing requirements, and environmental protection.
Classification by service includes Step-up, Step-down, Switching, and Converter substations.
Classification by construction includes Indoor, Outdoor, Underground, and Gas Insulated Substations (GIS).
GIS (Gas Insulated Substations) are favored in urban areas due to compact construction features.
Step-up substations are typically located at generating stations.
Categorization aids in site selection and equipment selection.
Standardization of design improves reliability and maintenance efficiency.
High cost of infrastructure for indoor/GIS substations compared to conventional outdoor types.
Generating stations
Transmission and distribution networks
Industrial power intake points
Service requirement classification: Step-up (Generators), Step-down (Distribution), Switching (Interconnection).
Construction classification: Outdoor (High space, low cost), Indoor (Protected from climate), GIS (Compact, high voltage).
C is correct тАФ Substations are fundamentally classified by both their operational service requirements and their physical constructional design.
In exams, remember that GIS substations are explicitly classified under 'Constructional Features' because their primary advantage is the space-saving physical structure utilizing SF6тАЛ gas.