Temat: insulator testing - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of a supply voltage value on the UV light generated by PD on HV cap insulators – a comparative analysis
Autorzy:: Urbaniec, I.
Frącz, P.
Powiązania:: https://bibliotekanauki.pl/articles/114117.pdf
Data publikacji:: 2015
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: corona discharges
optical emission
HV insulator testing
Opis:: The paper presents results of research works whose aim was to determine and indicate characteristics of optical signals emitted by corona discharges occurring in the vicinity of two types of high-voltage (HV) cap insulators. The experimental studies were performed under laboratory conditions using an ultraviolet (UV) camera. Two types of cap insulators were analyzed: one made of glass and the second one made of porcelain. For both considered insulating devices, the influence of supply voltage on the intensity of optical radiation was determined. The obtained results were analyzed and compared. Based on the results, it was stated that both cap insulators indicated similar characteristics but the most significant difference lied in the existence of the punch-through on the glass cap.
Źródło:: Measurement Automation Monitoring; 2015, 61, 10; 470-474
2450-2855
Pojawia się w:: Measurement Automation Monitoring
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Durability forecast of long rod composite insulators operating under variable mechanical loading conditions
Autorzy:: Bielecki, Jerzy
Wańkowicz, Jacek
Powiązania:: https://bibliotekanauki.pl/articles/2135731.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: composite insulator
cyclic loads
fatigue strength
insulator testing
life estimation
mechanical strength
Opis:: 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.
Źródło:: Archives of Electrical Engineering; 2022, 71, 3; 701--715
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Aluminous porcelain degradation study using mechanoacoustic and microscopic methods
Autorzy:: Ranachowski, P.
Rejmund, F.
Ranachowski, Z.
Pawełek, A.
Piątkowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/140868.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: porcelana
izolator ceramiczny
emisja akustyczna
analiza mikroskopowa
degradacja struktury
aluminous porcelain
ceramic insulators
insulator testing
acoustic emission
microscopic analysis
structural degradation
Opis:: This experimental paper comprises the results of acoustic emission (AE), microscopic and ultrasonic measurements of samples subjected to slowly increasing compressive stress. On the basis of conducted measurements the successive stages of the material structural degradation have been recognized. The objects of study were samples made of C 120 aluminous porcelain. The investigated material has found at present the application in the fabrication of technical elements like overhead power line insulators. In the case of such objects, not only high mechanical strength, but especially elevated durability as well as operational reliability are required. The expected "life time" of net insulators during exploitation is about 40 years. The analysis of obtained mechanoacoustic dependences pointed out a complex mechanism of degradation of the material. Microscopic investigation of samples, which were stressed to different levels of load, enabled to specify the development of gradual growth of microcracks and successive crushing out of elements of the structure. These processes appear to be similar to the ageing processes occurring in the material during long period of exploitation under a working load. Three stages of the structure degradation were distinguished. The preliminary and subcritical ones show low or moderate intensity of AE signals and considerable variety for the particular samples. The critical stage directly precedes the destructtion of samples. Its range is relatively narrow and reveals the AE activity of high energy. The effectiveness of dispersive and fibrous reinforcement of modern aluminous porcelain C 120 type has been described. Structural strengthening by corundum grains and mullite needle shaped crystals improves mechanical parameters and distinguishes this material from typical aluminosilicate ceramics. The presented results enable drawing up the conclusions concerning the resistance of investigated material to the ageing degradation process development during long term operation.
Źródło:: Archives of Electrical Engineering; 2011, 60, 2; 109-128
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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