A proposed design for the newFurnas 500 kV transmission lines - the high surge impedance loading line

摘要

1. With the present digital tools and results obtained from high voltage laboratories is possible to design the High Surge Impedance Loading Lines according with the needs envisaged in planning stage of an electric system. Those lines have much higher transmission capacity than the conventional designs. 2. Specifically for the situation studied, the studies indicated the alternative of 6 subconductors/phase to transmit 3600 MW through two 500kV HSILL. The surge impedance loading or the natural power of this new line conception is close to 1900 MW. 3. Switching surge insulation tests, overvoltages and insulation coordination statistical studies has been led to 5.5 meters as the minimun phase-to-phase insulation distance between axes for the alternative of 6 subconductors/phase . 4. Radio-interference measurements has also indicated a good performance when compared with the conventional designs. The corrected data obtained from the tests carried out in the experimental span has been indicated for 1MHz frequency and 42 dB above 1μV/m (FURNAS criteria for radio-noise level) a right-of-way width of 36 meters.