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At secondary transmission substation, electrical power is transmitted at
132┬аkV
66┬аkV
220┬аkV
33┬аkV
66┬аkV
In an Indian power system, the secondary transmission substation is the point where the high voltage from the primary transmission lines is stepped down to lower voltages suitable for regional sub-transmission. For this level, the typical voltage standard employed is 66 kV, acting as a bridge between the backbone transmission (220 kV or 400 kV) and the distribution network.
In an Indian power system, the secondary transmission substation is the point where the high voltage from the primary transmission lines is stepped down to lower voltages suitable for regional sub-transmission. For this level, the typical voltage standard employed is 66 kV, acting as a bridge between the backbone transmission (220 kV or 400 kV) and the distribution network.
VsтАЛ=VpтАЛ├ЧNpтАЛNsтАЛтАЛ тАФ Principle of transformer voltage reduction in substations.
The electrical power is stepped down at the secondary transmission substation using power transformers. This stage is crucial to reduce the voltage level from the transmission level (132 kV, 220 kV, or 400 kV) to a range that is technically and economically feasible for delivery to distribution substations, typically 33 kV or 11 kV.
Primary transmission is usually done at 220 kV, 400 kV, or 765 kV.
Secondary transmission acts as a buffer between high-voltage bulk transmission and lower-voltage sub-transmission.
The 66 kV level is specifically designated as a common secondary transmission voltage in India.
Sub-transmission typically ranges from 33 kV to 66 kV.
Reduces the size and cost of the distribution transformers.
Improves regional stability of the power grid.
Increases the number of conversion stages, leading to cumulative power loss.
Requires significant land and capital investment for substation infrastructure.
Connecting bulk transmission nodes to local industrial feeders.
Supplying large sub-transmission networks in urban areas.
In some regional grids, 132 kV is also used for secondary transmission, but 66 kV is the standard representative value for this classification in many competitive examination contexts.
33 kV is often categorized under sub-transmission or primary distribution depending on the utility architecture.
B is correct тАФ 66 kV is standard for secondary transmission substations in typical Indian power utility hierarchies.
Always remember the order: Transmission (HV) > Secondary Transmission (MV/Sub-transmission) > Primary Distribution (LV) > Secondary Distribution (Utilization Voltage).