Assessment of the State of Electrical Insulation by Measuring Isothermal Relaxation Current
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Experimental data on measurements of isothermal relaxation current (IRC) are presented for different kinds of industrial electrical insulation: cross-linked polyethylene (XLPE) 6-kV power cables and thermosetting insulation for the stator windings of high-power rotation machinery. The ageing of and damage to electrical insulation was assessed using indicators derived from the so-called distributed charge current. An analysis of the experimental data shows that the IRC method is highly sensitive for detection of incipient defects in these insulating materials and can be used to determine the indicators of ageing in XLPE insulation and their initial and limiting values.
Keywordsisothermal relaxation current technical diagnostics cross-linked polyethylene insulation thermosetting insulation power cables stator windings
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- 2.G. Hoff and H. G. Kranz, “Condition base maintenance of PE/XLPE insulated medium voltage cable network-verification of the IRC analysis to determine the cable age,” in: Conference Record of the IEEE International Symposium on Electrical Insulation, pp. 53 – 56 (2002).Google Scholar
- 4.A. P. Tyutnev, R. Sh. Ikhsanov, E. L. Grin’, G. P. Safonov, A. I. Kononenko, A. M. Sorokin, and I. V. Rudenko, “A physical-mathematical model for the phenomenon of recovered voltage and the prospects for using it to predict the technical state of polymers,” Vysokomol. Soed. Ser. A, 48(11), 2007 – 2014 (2006).Google Scholar
- 5.A. Kononenko and A. Hohryakov, The Experience in Applying New Recovery Voltage Parameters for the Impregnated Paper Insulation Cable Condition Diagnostics, Presented at 9th International Conference on Insulated Power Cables, Paris – Versailles, France, 21 – 25 June, 2015.Google Scholar
- 6.V. M. Pak and S. G. Turbachev, New Insulating Materials and Systems for High-voltage Electrical Machinery [in Russian], Énergoatomizdat, Moscow (2007).Google Scholar
- 7.G. N. Aleksandrov, V. L. Ivanov, K. P. Komskaya, N. A. Kozyrev, M. V. Kostenko, G. S. Kuchinskii, I. F. Polovoi, B. M. Ryabov, and V. A. Khoberg, High-voltage Techniques [in Russian], Vysshaya shkola, Moscow (1973).Google Scholar
- 8.Yu. N. Samorodov, Defects in Generators [in Russian], ZJSC “Énergeticheskie tekhnologii,” Moscow (2005).Google Scholar