Mar 2013
Electricity Transmission
Composite Cross Arms Study
Mar 2013
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Asset Management
Overhead line cross-arms. The use of an insulating cross-arm potentially allows the upgrading of an L3 275 kV tower to operate at 400 kV and the elimination of the insulator strings on other tower types.
Case Study Specification

Upon commencement of the project National Grid, The University of Manchester (UoM) and EPL Composite Solutions Ltd (EPL) will meet and agree specifications for the L2 and L3 lattice tower cross arms.

The specification will include the following (Current construction details in steel):

  • Design rules and standards for both structural and electrical performance (these being based on existing cross-arm / insulator standards)

  • Current weight and installed cost for steel cross arms / insulators, which will be used for benchmark purposes.

The specification will also include the required life time, handling techniques, maintenance practices, installation characteristics etc that may be essential or useful to take into account during the design process. This specification will be used as a reference document through the course of this and any future phases of the project to ensure that the final product is fit for purpose and satisfies the requirements of National Grid.

The project will also investigate the following topic areas:

  • Techno economic benefits of the case studies

  • Resolution of technical barriers to composite cross arm development

  • Manufacture and test of full scale prototypes

  • Development of future project road map

  • Timescales & costing.