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

• Autorzy: Bielecki Jerzy , Kotowski Piotr , Wańkowicz Jacek

Identyfikatory

DOI

10.24425/aee.2023.145415

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

composite suspension line insulators; high temperature low sag; HTLS; conductor; mechanical insulator strength; material fatigue; insulator tests; cyclic load; changing load

• Wydawca: Polish Academy of Sciences, Committee on Electrical Engineering
• Czasopismo: Archives of Electrical Engineering
• Rocznik: 2023
• Tom: Vol. 72, nr 2
• Strony: 392--405
• Opis fizyczny: Bibliogr. 18 poz., rys., tab., zdj.

Twórcy

autor

Bielecki Jerzy

• Institute of Power Engineering ul. Mory 8, 01-330 Warsaw, Poland

• https://orcid.org/0000-0003-1856-7323

autor

Kotowski Piotr

• Wroclaw University of Technology ul. Smoluchowskiego 25, 50-370 Wroclaw, Poland

• https://orcid.org/0000-0003-0149-8018

autor

Wańkowicz Jacek

• Institute of Power Engineering ul. Mory 8, 01-330 Warsaw, Poland

Bibliografia

• [1] Uliasz P., Material selection and design of construction for high temperature conductors made of AlZr alloys, Ph.D Thesis, Department of Non-Ferrous Metals, AGH University, Kraków (2010).
• [2] Geary R., Condon T., Kavanagh T., Amstrong O., Doyle J., Introduction of high temperature low sag conductors to the Irish transmission grid, Proceedings of CIGRE, paper B2-104 (2012).
• [3] Fujii O., Mizuno Y., Naito K., Temperature of insulators as heated by conductor, IEEE Trans. Power Delivery, vol. 22, no. 1, pp. 523–526 (2007), DOI: 10.1109/TPWRD.2006.887100.
• [4] CIGRE booklet no. 331, Considerations relating to the use of high temperature conductors (2007).
• [5] Stephen R., Considerations relating to the use of high temperature conductors, ELECTRA, vol. 34, no. 234, pp. 29–37 (2007).
• [6] Kiewitt W., Wunkte M., Bardl R., Kűhnel C., Laudon D., Stengel D., Comparative study of the long-term reliability of HTLS conductor systems, Proceedings of CIGRE, paper no. B2–204 (2018).
• [7] IEC TR 62039, Selection guidelines for polymeric materials for outdoor use under HV stress (2021).
• [8] IEC 61109, Insulators for overhead lines – Composite suspension and tension insulators for a.c. systems with a nominal voltage greater than 1000 V – Definitions, test methods and acceptance criteria (2008).
• [9] Wańkowicz J., Bielecki J., Models of long-term mechanical strength of long rod composite insulators, IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 2, pp. 360–367 (2010), DOI: 10.1109/TDEI.2010.5448089.
• [10] Wańkowicz J., Bielecki J., Life estimation for long rod composite insulators subjected to accelerating ageing by combined static and cyclic loading, IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 2, pp. 106–113 (2011), DOI: 10.1109/TDEI.2011.5704499.
• [11] Wańkowicz J., Bielecki J., Composite insulators for distribution lines and 110 kV transmission lines – Recommended characteristics, tests and guidelines for selection (monograph), Wydawnictwo PTPiREE (in Polish) (2012).
• [12] Bielecki J., Long-term mechanical and electrical strength of suspension and tension composite insulators subjected to cyclic loads, Ph.D Thesis, Institute of Power Engineering (IEN) (2010).
• [13] Bielecki J., Wańkowicz J., Durability forecast of long rod composite insulators operating under variable mechanical loading conditions, Archives of Electrical Engineering, vol. 71, no. 3, pp. 701–715 (2022), DOI: 10.24425/aee.2022.141680.
• [14] IEC 62217, Polymeric HV insulators for indoor and outdoor use – General definitions, test methods and acceptance criteria (2012).
• [15] PSE SA – Technical Standard Specification– 400 kV overhead transmission line, Annex 7c – Suspension composite insulators for 400 kV power grid (2015).
• [16] CIGRE, Green Book on Overhead Lines (2014).
• [17] Guery D., Lilien J.L., Destine J., Guerard S.L., Waering J.M., Gili J.M., Gogard B., Libert T., Aeolian vibrations on high voltage lines, comparative selfdampings evaluated on the field, Proceedings of CIGRE, paper B2-214 (2008).
• [18] Niezgodziński M.E., Niezgodziński T., Strength of Materials, Wydawnictwo Naukowe PWN (in Polish) (2010).

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).