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Difference between the tracking and erosion and accelerated aging tests on polymeric insulators

Although this standard describes several tracking and erosion tests which are often referred toin the literature as "aging tests",it is important to note that they are not accelerated aging tests in the sense that these tests fo not simulate exactly real life degradation conditions nor do they accelerate them to give a life equivalent test in a short time.Rather,they use continuous,cyclic or combined stresses to try to detect potential weaknesses which could compromise the insualtors perfoemance in service.

The relevant tests (9.3.3,Annex A and Annex B) are better described as screening tests,which can be used to rejet materials,or designs,which are inadequate.

The aging mechanisms on a polymeric insulator generally do not cause a progressive reduction of easily measurable aging-induced properties over time.The transition from "good condition" to "end of life" is frequently sudden with no forewarning and might be observed by ,for instance ,or deep UV-initiated cracks in the surface.The time and speed of this transition depends on multiple parameters,both of the insulator material and design,and of the operating envioment.Hence the use of such aging and degradation is available for the same or simular insualtors in the same or similar environments.

These tests are used therefore to give a general indiction of the quality of the design and materials with respect to the stresses arising in relatively harsh but not extreme environments.

آخرین بروزرسانی (جمعه, 15 مرداد 1389 ساعت 17:38)

 
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