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Primary grid type substation is
Step down substation
Step up substation
Distribution substation
None of above
Step up substation
A primary grid substation is a high-voltage facility designed to step up the voltage level generated by power plants for efficient long-distance bulk power transmission. These substations act as the entry point into the high-voltage transmission network, linking generating stations to the primary transmission grid.
A primary grid substation is a high-voltage facility designed to step up the voltage level generated by power plants for efficient long-distance bulk power transmission. These substations act as the entry point into the high-voltage transmission network, linking generating stations to the primary transmission grid.
P=3тАЛVLтАЛILтАЛcos╧Х тАФ Power in a three-phase system
PlossтАЛ=I2R тАФ Power loss in transmission lines
The principle relies on electromagnetic induction through large power transformers. By increasing the voltage (V) and reducing the current (I) for a given power level (P=VIcos╧Х), the I2R (ohmic) losses in the transmission lines are significantly minimized, and the conductor cross-sectional area required is reduced.
Primary grid substations are typically located near power generating stations.
They increase voltage to levels such as 220 kV, 400 kV, or 765 kV for bulk power transmission.
The primary grid connects multiple generating plants to the national load centers.
Reduction in transmission line conductor material (copper/aluminum) requirements.
Significant reduction in power losses during transmission.
Improvement in overall power system regulation.
High insulation costs due to extreme high voltage levels.
Requirement for large land areas and specialized switchgear.
Need for advanced protection and control systems.
Bulk power transmission between states or regions.
Grid integration of large-scale renewable energy farms.
A distribution substation is a step-down station that reduces voltage to levels like 11 kV or 33 kV for localized distribution.
Option A (Step-down) describes a load-center or secondary substation, not a primary grid substation.
B is correct тАФ A primary grid substation is essentially a step-up substation that prepares electrical energy for long-distance bulk transmission.
Always remember that in power systems, 'Primary' usually refers to high voltage/transmission, while 'Secondary' or 'Distribution' refers to low voltage/consumer-end.