Abstract

Background: The structural performance of cross arms used on distribution poles is studied in this paper. Tangent and Dead End configurations involving conventional (wood) and composite (fiber glass) cross arms are analyzed. Strength-to-Stiffness and Weight-to-Stiffness ratios associated with study cases are determined and evaluated. Results and Conclusion: It is observed that although initial costs are higher, composite cross arms offer long-term advantages in terms of strength, stiffness, performance and durability.

Highlights

  • In the electrical utility industry, lines of voltages 35 kV and below are generally termed distribution lines

  • Wood distribution cross arm sizes and design are standardized by the Rural Utilities Service (RUS) of United States Department of Agriculture [2 - 4] on the basis of length and pattern/location of insulator attachments

  • The equations are applicable to both tangent and dead end cross arms

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Summary

Background

The structural performance of cross arms used on distribution poles is studied in this paper. Tangent and Dead End configurations involving conventional (wood) and composite (fiber glass) cross arms are analyzed. Strength-to-Stiffness and Weight-to-Stiffness ratios associated with study cases are determined and evaluated

Results and Conclusion
INTRODUCTION
B View B‐B
TANGENT AND DEAD END CROSS ARMS
A Comparative Study of Distribution Structure
Connection to Pole
MATERIAL PROPERTIES
LOAD CAPACITY DERIVATIONS
Composite Cross Arms
STIFFNESS RATIOS
DISCUSSION
CONCLUSION

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