Development of Simple Diagnostic Tool for Detecting Insulators With Contamination Problems

9

Minimum surface resistance of insulators removed from the field under ultrasonic fog with tap water

19

1.58

Silicone I

62

0.05

Porcelain

24

0.08

EPDM

24

2.03

Silicone J

17

1.37

Silicone H

13

1.07

Silicone G

22

1.83

Silicone F

47

3.93

Silicone E

7

0.56

Silicone C

7.5

0.62

Silicone B

2.8

0.23

Silicone A

Ratio of resistance as-received/critical

Surface resistance (MΩ/cm)

Insulator