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The highest transmission voltage in India is
765 kV
400 kV
220 kV
132 kV
765 kV
In the Indian Power Grid, 765 kV AC is currently the highest operational transmission voltage utilized for long-distance bulk power transmission. This EHV (Extra High Voltage) level helps in reducing transmission losses (I2R) and enhancing power transfer capability over long geographical distances.
In the Indian Power Grid, 765 kV AC is currently the highest operational transmission voltage utilized for long-distance bulk power transmission. This EHV (Extra High Voltage) level helps in reducing transmission losses (I2R) and enhancing power transfer capability over long geographical distances.
P=3тАЛVLтАЛILтАЛcos╧Х тАФ Power transfer equation
PlossтАЛ=I2R тАФ Resistive line losses
The transmission capability of a line is proportional to the square of the operating voltage (PтИЭV2). By increasing the voltage to 765 kV, the current required to transmit a specific amount of power is reduced, which significantly lowers resistive heating losses and decreases the required conductor cross-sectional area for a given power rating.
765 kV is part of the National Grid's backbone for inter-regional bulk power transfer.
Higher voltages require larger clearances and specialized tower designs to manage corona discharge and electrostatic fields.
India is also exploring UHV (Ultra High Voltage) levels like 1200 kV for future expansion.
Power Grid Corporation of India Limited (PGCIL) operates the majority of these 765 kV networks.
Reduced transmission losses per MW of power
Increased thermal capacity of transmission lines
Improved system stability due to lower current for same power
Economical for transmitting large blocks of power over long distances
Higher insulation costs and larger tower footprints
Complex substations requiring high-capacity EHV transformers
Increased corona effect and audible noise levels
High reactive power management requirements
Long-distance inter-state power transmission
Evacuation of power from large thermal and hydro power plants
Backbone of the National Synchronous Grid
While 765 kV is the highest standard AC transmission voltage, India also utilizes ┬▒800 kV HVDC lines for ultra-long-distance transmission.
Option B (400 kV) was historically the backbone of the Indian grid before 765 kV became widespread.
A is correct тАФ The 765 kV level is the highest operational AC transmission voltage currently used in the Indian power system for bulk power delivery.
Always remember that power loss is inversely proportional to the square of voltage; therefore, higher voltages are always preferred for long-distance transmission to maintain grid efficiency.