HV Substations Insulators - Silicone Rubber RTV Coating

[luiscunha1978]

Hi!

I've watched a video fee days ago where a RTV coating was being applied in a substation insulators. I've noticed that they noy isolated the application area (surroundig the insulator) and the product was floating by the air. My question, is: the product could accumulate in the HV equipment live parts, like the terminal pads, the HV connectors, the HV aluminium bare cables. This could result in bad performance of the live parts?

Best regards,
Luis

 

[7anoter4]

See:

IEEE 1523 IEEE Guide for Application, Maintenance, and Evaluation of Room Temperature Vulcanized (RTV) Silicone Rubber Coatings for Outdoor Ceramic Insulators

 

[luiscunha1978]

My question is, when applying the coat in a Substation, what happened if the RTV Coating particles acumulate between the HV connector (live part) and the HV equipment terminal pad (live part), for instance? Or what will happened if the sprayed RTV coat acummulate direct in the bare alluminium cables (live part) that connect the HV equipments?

 

[7anoter4]

According to:
Review on RTV Silicone Rubber Coatings Insulator for Transmission Lines.

https://www.researchgate.net/public...ber_Coatings_Insulator_for_Transmission_Lines

6. Method of Application
It seems the coating is applied on isolated insulator: the insulator is off of line when is coated.
We used RTV silicon rubber for fire stops. It is a very good stuff but expensive and we need pumps and other accessories in order achieve a good coating. I don’t think it is recommended to do it directly on installed insulator.