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Performance Evaluation of 800 kV Porcelain Multicone Type Insulators Under Heavy Rain

高电压技术 2008年第12期34卷 2552-2557页

作者： Orsino Oliveira Filho Darcy R. Mello Jose A. Cardoso Rogerio M. de Azevedo Sylvia G. Carvalho Waldenir A. S. Cruz CEPEL Electric Power Research Center Av. Olinda s/n Adrian6polis Zip Code 26053-121 Nova Iguacu RJ Brazil furnas rua real grandeza 219 Zip Code 22283-900 Rio de Janeiro RJ Brazil

An 800 kV electric power substation can have more than one hundred of porcelain multicone type insulators supporting busbar *** or more sections in series,having middle and end fittings,compose these *** process can cause degradation of the cement used in this type of insulator and this fact can affect its dielectric performance under heavy *** paper presents results of an investigation based on power frequency high voltage tests performed on 800 kV porcelain multicone type insulators,removed from service after having operated for more than 20 years,as well a non-used one that had been stored on site for long *** insulators were tested in different arrangements:each section at a time and the two sections assembled in series,as actually used insulator *** tests were carried out under artificial rain ranging from 1 mm/min to 5 mm/*** results have confirmed a reduction of up to 30% in the insulator power frequency flashover voltage under 5 mm/min rain conditions and gave important information to the utility about radial cracks that were observed in many insulators and about the discharge mechanisms along the insulators under rain.

关键词：叠装式瓷绝缘子性能评估大雨条件电功率

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SMEARED CRACKING FEM SIMULATION OF ALKALI SILICA EXPANSION USING A NEW MACROSCOPIC COUPLED MODEL

SMEARED CRACKING FEM SIMULATION OF ALKALI SILICA EXPANSION U...

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第十二届国际混凝土碱集料反应会议

作者： Eduardo M.R.Fairbairn Fernando L.B.Ribeiro Romildo D.Toledo-Filho Luciana E.Lopes Marcos M.Silvoso Marcia F.F.guas Quintiliano M.Guedes COPPE/The post-Graduate Engineering Institute Universidade Federal do Rio de JaneiroC.P.68506CEP 21945-970-Rio de Janeiro-RJ-Brasil COPPE/The post-Graduate Engineering Institute Universidade Federal do Rio de JaneiroC.P.68506CEP 21945-970-Rio de Janeiro-RJ-Brasil COPPE/The post-Graduate Engineering Institute Universidade Federal do Rio de JaneiroC.P.68506CEP 21945-970-Rio de Janeiro-RJ-Brasil COPPE/The post-Graduate Engineering Institute Universidade Federal do Rio de JaneiroC.P.68506CEP 21945-970-Rio de Janeiro-RJ-Brasil COPPE/The post-Graduate Engineering Institute Universidade Federal do Rio de JaneiroC.P.68506CEP 21945-970-Rio de Janeiro-RJ-Brasil furnas Centrais Elétricas SA-DEC)-rua real grandeza 219 CEP 22281-031-Rio de Janeiro-RJ-Brasil furnas Centrais Elétricas SA-DEC)-rua real grandeza 219 CEP 22281-031-Rio de Janeiro-RJ-Brasil

＜正＞ We present an ASR thermo-chemo-mechanical expansion model recently developed, whose main feature is the representation of the stress-induced anisotropy, which is taken into account by means of a classical smeared cracking model that was implemented in a 3D Finite Element code. This model considers the influence of temperature and humidity in the development of ASR. Since cracking occurs generally at the beginning of the swelling process, it is suggested that the assessment of the reaction characteristics in free expansion tests could be attained considering a cracked specimen. Hence, an inverse analysis is used to determine ASR parameters. Besides the validation of the model by the simulation of laboratory tests, it was applied to the simulation of alkali-silica expansion in a real gravity dam. We computed the displacements at the crest of the block comparing it with measures taken in the field for the last 25 years. The good correlation between experimental and numerical data displayed the accuracy of the model indicating its potentialities to engineering applications.

关键词： Alkali-silica reaction numerical modeling coupled model cracking

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