11kV porcelain pin insulator shall be done following tests as per the international Standards, such as ANSI, IEC BS, AS and DIN standards.

11kV porcelain pin insulator

The 11kV porcelain pin insulator tests including
◆ Visual inspection
◆ Wet tests – Power frequency withstanding
◆ Step impulse test – 20 discharges

The step impulse tests were applied only during the first part of the present research. The application of these tests was discontinued due to two factors: the first was the complete absence of 11kV porcelain pin insulator failure that could be associated to improved performance. Insulator failures in these tests were common in the past. However, to solve this, much research work has been done in the last decades.

The second factor is associated to a lower impulse rate rise of 1.000 kV/μs; however this is a test-equipment limitation impossible to be solved in High-tech equipment laboratory.

The visual inspection considers the bulk analysis of the insulator, checking for imperfections. Non approved 11kV porcelain pin insulators were not submitted to the wet tests and were discarded.

The aim of the wet test is to determine the leakage current levels and insulation failure for 11kV porcelain– disruptive discharges that can be attributed to poor insulator field performance.

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