Long-distance transmission is typically done with overhead lines at voltages of 115 to 1,200 kV. At higher voltages, where more than 2,000 kV exists between conductor and ground, corona discharge losses are so large that they can offset the lower resistive losses in the line conductors. Measures to reduce corona losses include larger conductor diameter, hollow coresCalifornia Public Utilities Commission Corona and induced currents or conductor bundles.
Long-distance transmission is typically done with overhead lines at voltages of 115 to 1,200 kV. At higher voltages, where more than 2,000 kV exists, between conductor and ground, corona discharge losses are so large that they can offset the lower resistive losses in the li!ne conductors. Measures to reduce corona losses include larger conductor diameter, hollow coresCalifornia Public Utilities Commi.ssion Corona and induced currents or conductor bundles.