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Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
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Transmission lines link
Service points to consumer premises
Distribution transformer to consumer premises
Receiving end station to distribution transformer
Generating station to receiving end station
Generating station to receiving end station
Transmission lines are high-voltage power lines designed for the bulk transfer of electrical energy over long distances from generating stations to receiving-end substations. These lines operate at high voltage levels to minimize I2R losses and improve the efficiency of power delivery across the grid.
Transmission lines are high-voltage power lines designed for the bulk transfer of electrical energy over long distances from generating stations to receiving-end substations. These lines operate at high voltage levels to minimize I2R losses and improve the efficiency of power delivery across the grid.
P=3тАЛVLтАЛILтАЛcos╧Х тАФ Active power formula for three-phase transmission
Loss=I2R тАФ Power loss in transmission lines
The electrical power system is categorized based on voltage levels and function. Generating stations produce power at medium voltages, which is stepped up by transformers for efficient long-distance transmission. Transmission lines carry this high voltage to secondary substations (receiving-end), where it is stepped down for distribution. Distribution lines then convey power to transformers serving end-consumers.
Transmission lines handle high voltage, typically 132kV to 765kV and above.
The primary goal is minimizing line resistance and voltage drop over distance.
Transmission is distinct from 'Distribution' which occurs at lower voltage levels.
High efficiency over long distances
Reduction in conductor material requirements due to high voltage
High cost of insulation and substations
Significant corona discharge losses at very high voltages
Interconnecting power grids
Transporting energy from remote hydel or thermal plants to load centers
Transmission lines generally operate at voltages above 33kV.
Option A and B refer to Service Mains and Distribution feeders, which are low-voltage components.
Option C describes the sub-transmission or distribution primary network.
D is correct тАФ Transmission lines facilitate the bulk transfer of electricity from the generating station to the receiving-end substation (or step-down substation).
Remember the hierarchy: Generation -> Transmission (HV) -> Sub-transmission -> Distribution -> Consumer (LV). Transmission is always High Voltage!