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ICTD International Centre for Training and Development

Overhead Transmission Lines Problems and Maintenance

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Description

Transmission line towers constitute about 28 to 42 percent of the cost of the transmission line. The increasing demand for electrical energy can be met more economically by developing different light-weight configurations of transmission line towers.

Foundation of any structure plays an important role in safety and satisfactory performance of the structure as it transmits mechanical loads of the electrical transmission system to earth. A transmission structure without having a sound and safe foundation, it cannot perform the functions for which it has been designed. The foundations in various types of soils have to be designed to suit the soil conditions of particular type.

In addition to foundations of normal towers, there are situations where considering techno-economical aspect for special towers required or river crossing which may be located either on the bank of the river or in the mind stream or both, pile foundation may be provided.

Course Objectives

Upon completion of the course, participants should be able to:

  • Select the type of tower depending on antenna load, footprint, height needed and financial budget.
  • To have a base good quality foundation essential for a safe tower with long lift time
  • Know that working at high height does always imply danger.
  • Use good equipment and play safe.
  • Make sure that you have the time that you need. Stress will allow you to make mistakes which can be very costly.
  • Plan for continuous inspections for corrosion and other defects.
  • To exchange information on the state of the art in research, technology, materials, maintenance, manufacturing, and design

Course Outline

Module 1: Introduction

  • Power System
  • Types of OHTL
  • Cheek Survey

Module 2: Tower Foundation

  • Planning stages
  • Types of Soil
  • Types of foundation
  • Foundation in water
  • Foundation in hard Soil

Module 3: The Concrete Foundation

  • Concrete composition
  • Mixing concrete
  • Pouring the concrete
  • Hydration
  • Curing
  • Concrete strength

Module 4: Excavation

  • General
  • Type of Excavation
  • Very poor soil Excavation
  • Normal soil Excavation
  • Hard soil Excavation
  • Excavation in water

Module 5: How to Choose Tower Type

  • Antenna Load
  • Tower Footprint
  • Height of Tower
  • Budget

Module 6: Corrosion

  • Corrosion Prevention
  • Antioxidant joint compound
  • Cathodic Protection

Module 7: Assembling Towers

  • Methods of Tower election
  • Election members

  • Election by parts

  • Election by sections

  • Election by air Planes

  • Election by cranes

  • Inspection of tower sections

  • Preassembly on the ground

  • Assembling of high towers

Module 8: Inspection and Assessment

  • Inspection Technologies
  • Inspection Tools and Equipment
  • Training Technologies
  • Data Collection and Management

Module 9: Quality and Testing

  • Testing of martial
  • Foundation testing
  • Conductors testing
  • Insulator testing
  • Tower testing

Module 10: Monitoring and Maintenance

  • Monitoring the capacity
  • Life Extension
  • Reliability and Durability
  • Restoration Methods
  • Managing with Reduced Budgets
  • Live Working Practices

Module 11: Lightening protection

  • Direct hits
  • Indirect hits

Module 12: Safety

  • Excavation works safety
  • Civil works Safety
  • Election works safety
  • Conductor sagging works safety

Course Methodology

A variety of methodologies will be used during the course that includes:

  • (30%) Based on Case Studies
  • (30%) Techniques
  • (30%) Role Play
  • (10%) Concepts
  • Pre-test and Post-test
  • Variety of Learning Methods
  • Lectures
  • Case Studies and Self Questionaires
  • Group Work
  • Discussion
  • Presentation

Who should attend

Engineers and Technicians from Electrical Power distribution Utilities Companies, supervisors and site engineers of the contractors of infrastructure design and installation of power cables distributors. Utility executives, managers, and engineers with responsibility for transmission, distribution, and substation design; construction; and operations and maintenance are invited. Manufacturers / vendors who provide to the electric utility industry are invited to attend and exhibit.

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