Application of High-Temperature, Low-Sag (HTLS) Conductors


The range of materials and commercially available high-temperature, low-sag (HTLS) conductors is studied in depth. Installation procedures and problems are discussed and field results examined. Deterioration of HTLS conductors at temperatures above their design limits is explained. The peculiar but important issues involving the use of annealed aluminum wires in combination with steel and carbon fiber composite cores are explored. Limitations of HTLS use in corrosive and extreme ice loading regions are explained.


8:30AM Continental Breakfast
9:00AM Introductions & Discussion
• Instructor background & experience
• Student interest and experiences in HTLS
9:15AM Power System Analysis – Where are HTLS conductors useful?
• Why most transmission line loads are low?
• What causes emergency loads?
9:15AM Limitations of Conventional ACSR
• Annealing of aluminum
• Creep of Aluminum
• Sag at maximum temp
10:15AM Break
10:30AM HTLS materials – Aluminum (for Current)
• Annealed aluminum
• Annealed aluminum
11:00AM HTLS materials – Core (for Load)
• Steel core – HS, EHS & UHS
• Invar Steel
• Carbon Epoxy Composite
• Aluminum Metal Composite
11:30AM Sag-tension Calculations
• All aluminum conductor
12:30PM Lunch
1:30PM Commercial HTLS conductor designs
• Making your own ACSS
2:00PM Qualification Testing of HTLS
• ASTM & IEC Specs
• CIGRE TB 426
• Running Field Trials
2:30PM Installation concerns
• Shear stress limits of ACCC & ACCR
• Installation of ACSS
• Connections
2:45PM Break
3:00PM Practical evaluation of Conductor Alternatives
• IEEE Test Case for HTLS Comparison
• CIGRE Evaluation of Alternatives
• Practical utility applications of HTLS
4:00PM Where are we going from here?
4:30PM End of Seminar