Test for polymer line post insulator
As one kind of the composite line insulator, the polymer line post insulator is one of the main products of China Orient Power. The polymer line post insulator consists of silicone rubber housing, an FRP core, and metal end fittings. The silicone rubber housing can protect the core, which can bear the mechanical load. The test for polymer line post insulator is very important. In this article, we are focusing on the test for polymer line post insulator.
The test for polymer line post insulator:
When doing the test for polymer line post insulator, one insulator should be selected randomly from the samples, which shall be subjected to crack indication by dye penetration, in accordance with ISO 3452, on the housing in the zone embracing the complete length of the interface between the housing and metal fitting and including an additional area, sufficiently extended, beyond the end of the metal part.
polymer line post insulator
The indication shall be performed in the following way during the test for polymer line post insulator:
1. The surface shall be properly pre-cleaned with the cleaner;
2. The penetrant, which shall act during 20 min, shall be applied on the cleaned surface;
within 5 min after the application of the penetrant, the insulator shall be subjected, at the ambient temperature, to a tensile load of 70 % of the SML, applied between the metal fittings; the tensile load shall be increased rapidly but smoothly from zero up to 70 % of the SML, and then maintained at this value for 1 min;
3. The surface of high voltage insulator shall be cleaned with the excess penetrant removed, and dried;
4. The developer shall be applied, if necessary;
5. The surface shall be inspected.
Some housing materials may be penetrated by the penetrant. In such cases, evidence shall be provided to validate the interpretation of the results.
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