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İSPİRLİ, MEHMET MURAT

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İSPİRLİ

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MEHMET MURAT

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2018 - 201912020 - 20221
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Subject: Comparative tracking index (CTI) ×

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Now showing 1 - 2 of 2
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    Investigation of tracking phenomenon in cable joints as 3D with finite element method
    (SPRINGER, 2018) İSPİRLİ, MEHMET MURAT; Ispirli, Mehmet Murat; Yilmaz, Aysel Ersoy; Kalenderli, Ozcan
    Underground cables are manufactured finite length in terms of commercial use. As the underground cables are produced for commercial use, the length is often insufficient for transmission and distribution lines. Therefore, the cables are added together to provide the desired length by using joints. At the joint points, insulators such as cable terminal cap and resin are used. In this study, surface tracking process of polyurethane resin, which is a filling material used in underground energy transmission and distribution systems, is investigated using finite elements method. A finite elements model is created based on IEC 60112 test standard. The developed model was used to investigate the electric potential and electric field distribution between the electrodes for different positions of the solution droplet, which is needed to use in the test, on the polymer sample surface.
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    PublicationOpen Access
    The application of recurrence plot in tracking characteristics of PU-Based insulation material
    (2022-11-01) İSPİRLİ, MEHMET MURAT; İSPİRLİ M. M., ERSOY A.
    Cable joints are the weakest part of underground energy transmission systems due to the presence at the interface between the insulation material and the cable conductor. Underground cables serve under heavy service conditions (dust, dirt, humidity, etc.). So, the tracking resistance of polymers used in joint points of underground cables needs to be determined. In the first section of the study, equivalent samples were prepared under vacuum conditions in laboratory conditions from PU-based filling material used as filler material in low voltage underground cable joints. Prepared samples were tested in an established CTI test setup according to ASTM D5288. Samples were tested in prepared test setup under 600 V, 500 V, 400 V, and 300 V voltages. In the second section of the study, leakage currents were analyzed with the recurrence plot method, which is frequently used in nonlinear times series analysis. Later, recurrence quantification analysis was made by Recurrence Rate (RR) and Determinism (DET) parameters. The behavior of the system occurs less linear with decreased Recurrence Rate in Recurrence Quantification Analysis (RQA). RR and DET parameters increased with the decrease in voltage levels. As a result of, it is revealed that the tracking formation behavior of the PU cable joint becomes more unstable with increasing voltage. Thus, the CTI and RQA are shown to be also available to determine the tracking resistance of cable joints.