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At receiving end of primary grid substation electrical power is reduced to 66 kV for
Primary distribution purpose
Secondary transmission purpose
Secondary distribution purpose
Primary transmission purpose
Secondary transmission purpose
Electrical power transmission is divided into tiers based on voltage levels to optimize efficiency and insulation costs. A 66 kV level is typically classified as secondary transmission, which bridges the gap between high-voltage primary transmission (e.g., 220 kV or 400 kV) and distribution substations.
Electrical power transmission is divided into tiers based on voltage levels to optimize efficiency and insulation costs. A 66 kV level is typically classified as secondary transmission, which bridges the gap between high-voltage primary transmission (e.g., 220 kV or 400 kV) and distribution substations.
VlineтАЛ=3тАЛVphaseтАЛ тАФ Relation between line and phase voltage in 3-phase systems
P=3тАЛVLтАЛILтАЛcos╧Х тАФ Real power transmission formula
In the standard power system hierarchy, bulk power generated at 11 kV or 33 kV is stepped up to 220/400/765 kV for primary transmission over long distances. To reduce the massive insulation requirements at distribution points, this voltage is stepped down to sub-transmission levels (66 kV or 33 kV) at a primary grid substation. This voltage is then further stepped down to 11 kV or 6.6 kV at secondary substations for local distribution.
Primary transmission typically occurs at 220┬аkV and above.
Secondary transmission voltage levels are standardly 33┬аkV,66┬аkV,or┬а132┬аkV.
Primary distribution is generally handled at 11┬аkV or 33┬аkV.
Secondary distribution is the final step to consumers at 400┬аV/230┬аV.
Reduced insulation costs compared to primary transmission
Allows for local tapping of power near industrial centers
Requires additional substation infrastructure
Lower voltage increases line current for same power transfer
Supplying power to large industrial complexes
Interconnecting small regional substations
In some regions, 33 kV is also categorized under secondary transmission depending on local network practices.
Option A is incorrect because primary distribution occurs at lower voltages, typically 11 kV or 33 kV.
B is correct тАФ 66 kV is standardized as a secondary transmission voltage level in power system engineering.
Remember the hierarchy: Generation тЖТ Primary Transmission тЖТ Secondary Transmission тЖТ Primary Distribution тЖТ Secondary Distribution. Memorizing the specific voltage brackets (kV) is high-yield for competitive exams.