Table 2 Audible and visible corona voltage of deep under-ribs and alternating shed insulator under clean and polluted conditions.

From: Performance analysis of high voltage disc insulators with different profiles in clean and polluted environments using flashover, withstand voltage tests and finite element analysis

Test name

Type of insulator

Audible corona corresponding leakage current

Visible corona corresponding leakage current

Clean insulator

Polluted insulator

Clean insulator

Polluted insulator

Power frequency flashover test

Deep under-ribs insulator

30.0 kV

0.174 mA

19.54 kV

0.761 mA

75 kV

0.296 mA

67.59 kV

2.429 mA

Alternating shed insulator

22.49 kV

0.079 mA

20.3 kV

0.479 mA

72 kV

0.304 mA

70.63 kV

1.783 mA

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