11 kV P-11-Y Pin Insulator Dimensions and Specifications

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Insulator Type Test:

Type tests are intended to verify the main characteristics of an insulator which depend mainly on its design. They are usually carried out on a small number of insulators and only once for a new design or manufacturing process of insulator and then subsequently repeated only when the design or manufacturing process is changed. When the change affects only certain characteristics, only the test(s) relevant to these characteristics need to be repeated. Moreover, it is not necessary to perform the electrical, mechanical and thermal-mechanical type tests on a new design of insulator if  a valid test certificate is available on an insulator of equivalent design is given in the relevant clauses when applicable. The results of type tests are certified either by test certificates accepted by the purchaser of by test certificates confirmed by a qualified organization.

For mechanical tests, the certificate shall be valid for ten years from the date of issue.

Their is no time limit for the validity of certificates for electrical type tests.

Within the above limits, the type test certificates remain valid while there is no significant disparity between the results of the type tests and subsequent corresponding sample tests. A method for comparing type and sample test results is given in IEC 383 annex A.

Type tests shall be carried out only on insulators from a lot which meets the requirements of all the relevant sample and routine tests not included in the type tests.