Keystone Insulator Cleaners

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Electrical Repairs
Grease like silicone coating compounds have been used successfully as protective coatings of porcelain and glass insulators in electrical maintenance for over 25 years. All forms of present insulator greases prevent formation of a water film because of their water repellent, low surface energy characteristics. Service experience with silicones has shown that when they maintain their water repellency, they provide protection of the insulator by breaking up water filming. However, extended exposure to sparking, ultraviolet radiation, water erosion, or particulate contamination will reduce the water repellency of the grease. When this occurs, leakage currents and dry band discharges may result in decomposition of the grease forming a depressed path in the coating. These paths act as collection sites for moisture, leading to concentrated currents forming arcs. This path or valley can thus lengthen on insulator surface with time. Under high intensity arcs on a relatively thin silicone coat, channeled tracks may develop in the grease, resulting in local hot spots on the insulator surface. If the temperature of the track gets hot enough, the glass or porcelain insulator may fracture.

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