Investigation of insulating properties of crushed-stone on the conditions it should perform as a security element in electrical systems

Author

Silverio, V.F. ; Scoralick, M. Rita ; Porte, Carlos M.

Author_Institution

Dept. of Electr. Eng., Federal Univ. of Minas Gerais, Belo Horizonte, Brazil

fYear

1991

fDate

8-12 Jul 1991

Firstpage

1242

Abstract

The authors investigate the effective insulating properties of the types of crushed stones usually employed in Brazilian substations in the frequency range of the most important occurrences at electric power systems (from normal conditions to transients associated with atmospheric discharges). The measurements consider several humidities of the material. The influence of impregnating water resistivity is evaluated in the range of values actually found for rain water. In the frequency range investigated, only the values found for the condition of entire immersion of the material into water presented values of resistivity lower than 3000 Ω-m, which is generally adopted by the Brazilian utility companies in their projects

Keywords

insulating materials; insulation; power system protection; atmospheric discharges; crushed-stone; electric power systems; electrical systems; immersion; impregnating water resistivity; insulating properties; security element; substations; utility companies; Conducting materials; Conductivity; Containers; Dielectric materials; Electrodes; Frequency; Humidity measurement; Insulation; Performance evaluation; Rain;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on

Conference_Location

Tokyo

Print_ISBN

0-87942-568-7

Type

conf

DOI

10.1109/ICPADM.1991.172305

Filename

172305