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Project: T183700 #3276

This project was initiated to investigate and report on the state of the art of transmission live line maintenance and to introduce any new work methods that can be employed to accomplish such work.

It is crucial to determine how live line work techniques can minimize the impact of power outages while promoting reasonable practices and economics.

This investigation included an exhaustive literature and market information search, as well as a survey of key existing current work practices in the art of live line work (LLW) methods on A.C. Overhead System voltages from 69 kV to 500 kV, in North America.

Challenges to LLW from issues such as inadequate original design clearances or new safety requirements were also investigated and reported in this study. Examples of standard work practices, technologies, tools and equipment are presented. This work addresses clearance requirements, candidate replacement components and structures on which the work will be conducted. These aspects are illustrated for various structure types, line arrangements, configurations and line components, dependent on the varying in-situ conditions. In addition, the report includes information on relatively new tools, equipment and work methods being used today. Basic testing of tools and equipment is also discussed.

The study identifies the relevant North American and international standards and regulations governing the live line work method.

This information will provide project managers, as well as contractors and operational staff, the information necessary to help determine and optimize when and how live line work methods should be employed when conducting major maintenance activities. It also gives them the tools to determine which work methods best suit each of their specific projects and how to properly prepare for such projects.


Transmission, live line work, live line tools, bare hand work