FUNDAMENTALS OF OVERHEAD TRANSMISSION LINES

Objective:

• Model power systems using appropriate system parameters
• Create and evaluate different load flow scenarios using various switching configurations
• Analyze and interpret power system responses under different operating conditions
• Improve power system performance by optimizing system parameters
• Develop and analyze protection curves to achieve effective coordination between system bays
• Understand different tower types, tower families, and their applications
• Understand tower loading requirements and design considerations
• Apply insulation coordination principles in overhead line systems
• Understand lightning protection systems and their performance requirements
• Understand overhead line foundations, earthing systems, conductors, insulators, and surge arresters
• Analyze electromagnetic fields and electromagnetic compatibility considerations in power systems

Content:

Overview of Overhead Lines and Foundations

• Introduction to overhead transmission lines
• Comparison between overhead lines and underground cables
• Types of support structures
• Steel lattice towers
• Wooden poles and support structures
• Introduction to overhead line foundations
• Soil investigation techniques
• Types of foundations
• Foundation design principles
• Site preparation and construction works

Survey, Structures, Towers and Poles

• Survey equipment requirements
• Aerial and ground survey techniques
• Assessment of soil conditions and terrain characteristics
• Wayleaves, access planning, and terrain optimization
• Detailed line surveys and profile development
• Computer-aided design techniques
• Environmental conditions affecting tower design
• Typical overhead line design parameters
• Impact of conductor loads on tower and support structures
• Substation gantry structure design
• Lattice steel tower design considerations
• Tower testing requirements
• Types of poles and towers
• Pole and tower structural design

Conductors and Lightning Protection

• Environmental factors affecting conductor selection
• Types of conductors used in overhead lines
• Aerial bundled conductors
• Conductor breaking strength considerations
• Bi-metal connectors and applications
• Lightning protection principles
• Insulator arcing horn coordination
• Surge diverters and protection devices
• Load-flow constraints in power networks

Line Rating and Design Span

• Calculated line ratings
• Power carrying capacity of overhead lines
• Corona discharge and line rating calculations
• Practical worked examples and exercises
• Design span considerations
• Clearance and loading requirements
• Distribution voltage clearance requirements
• Transmission voltage clearance requirements
• Overhead line clearance calculations
• Practical design exercises

Line Fittings, Impedance and Maintenance

• Types of overhead line fittings
• Aerodynamic effects on overhead lines
• Suspension clamps and applications
• Sag adjusters and other line fittings
• Understanding overhead line impedance
• Inductive reactance calculations
• Capacitive reactance calculations
• Resistance calculations
• Worked examples and exercises
• Overhead line inspection and maintenance practices

For Whom:

• Project Engineers and Managers
• Electrical Engineers and Technicians
• Power System Operators
• Design Engineers
• Asset Engineers and Managers
• Planning Engineers and Managers
• Protection, Instrumentation, and Commissioning Engineers and Technicians
• Professionals involved in the operation, planning, design, and maintenance of power systems