access icon free Appendix B: Testing of insulators

Author(s): J. S. T. Looms
Source: Insulators for High Voltages, p. 262-264
Publication date January 1988

For glass and porcelain, the tests described include routine sampling of raw materials and physical tests on fired or moulded pieces, such as measurement of cross-breaking strength on small porcelain rods. Porcelain cap-and-pin bodies are usually tested routinely for electrical puncture strength and resistance to hydraulic bursting, while hollow shells are electrically puncture-tested only. Simple 'ring ing' impact tests are made on porcelain components of multiple-cone posts, to detect cracks. Polymeric insulators are not easy to test non-destructively although many types are proof-pulled, as are porcelain discs and long rods, both to reject weak pieces and to 'set' conical joints.

Inspec keywords: crack detection; nondestructive testing; polymer insulators; raw materials; insulator testing; porcelain insulators

Other keywords: raw material; polymeric insulator testing; cross-breaking strength; electrical puncture strength; porcelain cap-and-pin body; crack detection; nondestructive testing; small porcelain rods; hydraulic bursting

Subjects: Power line supports, insulators and connectors

Related content

content/books/10.1049/pbpo007e_appendixb
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading