Stress and Strain Determination Occurring in Contact Area of the 450/75 ACSR Conductor

摘要

The ACSR conductors are the metallic ropes stretched freely between poles and fixed onto them by supporting elements, which ensure the circulation of electrical energy. The special importance of this electrical conductors, coupled with the very high costs for repairs and replacements have imposed that the lifetime of power lines conductors to be between 50 and 80 years. Energy interruptions due to broken conductors have catastrophic impact from an economic, social and national security point of view. The present paper aims to determine stress and strain which are developing into contact area of the wires in the high voltage conductors. The study was performed using new conductors and 42 years aged conductors. Therefore an analytical calculation was performed in order to understand how the contact types are developed in conductor. The local stress and strain were determined experimental and a series of polynomial equations have been proposed. Theoretical and experimental researches have shown that the shape and size of imprints occurring at the contact points between wires have a significant influence on stress and strain of the conductors. An assessment of contact stresses under plastic deformations cannot be made without taking into consideration the characteristics of the imprints.