Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Archives of Electrical Engineering

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Impact of increased temperature of lower end-fitting of a composite long rod insulator on its mechanical strength under variable loads

Bielecki Jerzy, Kotowski Piotr, Wańkowicz Jacek

Archives of Electrical Engineering

2023

Vol. 72, nr 2

392--405

This paper describes results of tensile mechanical strength testing of two types of composite suspension line insulators from two manufacturers. In order to take into account the operation of composite insulators in overhead transmission lines with high-temperature low-sag (HTLS) conductors, the testing of their static and fatigue strength was performed at both ambient and elevated temperatures. The results showed that the static mechanical strength of composite insulators decreased with an increase in the temperature of the lower end fitting of the insulator, and proved that it followed a third-degree polynomial function. Calculations performed demonstrated that a significant cause of reduction in strength was the increase in the radial stress following the temperature increase in the crimped glassepoxy resin core of the insulator. The results of the fatigue strength testing demonstrated that the increase in the temperature of the lower end fitting of the insulator up to 85°C degree had a little effect on the fatigue strength of the tested composite insulators.

Durability forecast of long rod composite insulators operating under variable mechanical loading conditions

Bielecki Jerzy, Wańkowicz Jacek

Archives of Electrical Engineering

2022

Vol. 71, nr 3

701--715

Suspension line insulators are during their operation subject to static forces and variable loads, usually of a cyclic character. These variable loads have a significant impact on the mechanical durability of composite insulators. A method of providing durability forecast for composite line insulators based on fatigue characteristics has been proposed. The method allows providing durability forecast of insulators in a wide range of variable loadings, i.e. from quasi-static to high amplitude loadings.