Post pin ceramic insulators are RTV Silicone Rubber Coated Insulator can be used in pollution areas. Compared to RTV silicone costing insulator and non coated insulator is to introduce the advantages.

Post pin ceramic insulators with 20 kV operating voltage were used as samples. The samples were coated with silicone rubber by using high pressure nozzle with thickness of about 0.3 mm.

The RTV silicone rubber coating materials were made by Dow Corning. The pictures of the samples are shown in Figure 1. A test chamber made from aluminium panel with size of 90
cm x 90 cm x 120 cm was used to simulate pollution exposed to the samples. The front opening of the test chamber was made from acrylic to facilitate the observation of arcing on the sample surface.
For salt layer test, 40 g kaolin was used in every 1 litre water and NaCl was added to the solution to get the desirable conductivity in accordance with IEC Standard No. 507 1991 (salt layer test and salt fog test). For salt fog test, 40 g kaolin was used in every 1 litre of water and NaCl was used as salt fog. The detail of experimental conditions investigated in this experiment are tabulated as follow.
Experimental conditions include insulator and environmental condition and applied voltage
Clean insulator, clean fog – applied voltage 10-60kv
Insulator polluted with kaolin-salt pollution at 1.3 mS; clean fog– applied voltage 10-60kv
Insulator polluted with kaolin-salt pollution at 2 mS; clean fog – applied voltage 10-60kv
Insulator polluted with kaolin-salt pollution at 3.6 mS; clean fog – applied voltage 10-60kv
Insulator polluted with kaolin pollution; salt fog at 2 mS – applied voltage 10-60kv
Insulator polluted with kaolin pollution; salt fog at 3 mS – applied voltage 10-60kv
Insulator polluted with kaolin pollution; salt fog at 3.6 mS – applied voltage 10-60kv

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