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Transmission voltages in the range 230 kV-765 kV are known as
High voltage (HV)
Extra High Voltage (EHV)
Ultra High Voltage (UHV)
All of these
Extra High Voltage (EHV)
In power system engineering, transmission voltages are categorized based on their magnitude. Voltages in the range of 230 kV to 765 kV are classified as Extra High Voltage (EHV).
In power system engineering, transmission voltages are categorized based on their magnitude. Voltages in the range of 230 kV to 765 kV are classified as Extra High Voltage (EHV).
VEHVтАЛтИИ[230┬аkV,765┬аkV] тАФ Range definition for EHV transmission
The classification of voltage levels is based on the insulation requirements, corona discharge effects, and electrostatic field intensity. As voltage increases, the insulation dimensions and tower configurations change significantly, necessitating this specific terminology to define design standards and protection requirements.
Transmission voltages are categorized into HV, EHV, and UHV based on international standards (IEC/IEEE).
EHV transmission is preferred for long-distance power transfer to reduce I2R losses.
Corona loss increases significantly at EHV levels, necessitating bundle conductors.
765 kV is a standard EHV level widely used in the Indian National Grid.
Higher power transfer capability over long distances
Reduced percentage of transmission line losses
Better voltage regulation and stability
High cost of insulation and substations
Increased corona effect and radio interference
Strict right-of-way requirements
Bulk power transmission between states
Interconnection of regional power grids
In India, the power grid utilizes 400 kV and 765 kV as primary EHV levels for backbone transmission.
Voltages above 765 kV are generally categorized as Ultra High Voltage (UHV).
B is correct тАФ Transmission voltages in the range of 230 kV to 765 kV are officially classified as Extra High Voltage (EHV).
Always remember that UHV generally refers to systems operating at 800 kV and above, while EHV covers the critical 230 kV to 765 kV range used in most national grids.