Summary

For a line the dimensions of the tower top are determined by phase-to-earth and phase-to-phase clearances. The position of conductors and earth wire at tower and the sag at mid span change with climatic conditions. Practices of several countries are compared. The study results in the proposal to consider "still air" and "high wind" cases to withstand respectively overvoltages and power frequency voltages.

Additional informations

Publication type Technical Brochures
Reference 348
Publication year
Publisher CIGRE
Study committees
  • Overhead lines (B2)
Working groups WG B2.06
File size 1 MB
Pages number 114
Price for non member 210 €
Price for member Free
Tower Top Geometry and Mid Span Clearances
Tower Top Geometry and Mid Span Clearances