Reactive vs. Proactive Maintenance: Looking for Insulator Washing Alternatives
For utilities operating in coastal and industrial areas, insulator contamination is a maintenance issue that comes back again and again. Salt, dust, and other airborne pollutants settle on porcelain and glass insulators and build up over time. On their own, these deposits may remain on the surface without causing an immediate problem.
Inspection, washing, waiting for contamination to build up, and then washing again — this is a familiar cycle for maintenance teams. But this is what happens when maintenance remains reactive rather than proactive.
If the insulator surface and the contamination conditions remain the same, we cannot expect a different outcome.
A proactive approach, instead, addresses the root of the problem and aims to reduce the need for repeated intervention.
Why are some Still Washing Insulators?
Porcelain and glass are naturally hydrophilic materials. What does this mean? In simple terms, water tends to spread across their surfaces instead of forming separate droplets.
Why is this relevant? Because when moisture combines with salt, cement, sand, agricultural residues, and other contaminants, it can create a conductive layer that allows current to flow along the insulator surface, producing leakage current, dry-band arcing, and eventually flashovers.
Washing is effective: it removes contamination and restores the insulator surface. However, it does not stop the cycle. As new pollution accumulates and moisture returns, similar conditions can develop again.
However, when washing has to be repeated several times a year, the costs quickly add up, making it an expensive insulator maintenance strategy.
What’s an alternative to insulator washing?
If the problem is how moisture interacts with contamination, the solution is to change how water behaves on the insulator surface. Right? Easy!
You can do this by applying an RTV silicone coating, which creates a hydrophobic surface and makes it harder for water to form a continuous film.
Midsun HVIC is an RTV silicone coating that can be applied to all types of electrical insulators. Once applied, silicone encapsulates the contaminats and the water forms droplets instead of a continuous film. This makes it harder for conductive paths to develop, helping to limit leakage current and reduce the risk of pollution-related flashovers.
This way, even rain helps remove surface contamination, because water droplets run off the insulator and carry dust and other loose contaminants with them, reducing pollution accumulation over time.
From Repeated Washing (Reactive Maintenance) to RTV-Coated Insulators (Proactive Maintenance)
Washing an insulator is not simply about removing dirt. It can also involve:
Planning and coordination
Demineralized water
Operating restrictions
Planned outages
Trained personnel
Access to hard-to-reach areas
Specialized equipment
When washing becomes a frequent task, all of this adds to the maintenance workload.
RTV silicone coatings offer another way to manage contamination by changing how moisture behaves on the insulator surface. This proactive approach can help reduce:
Frequency of insulator washing
Dependence on demineralized water
Maintenance interventions
Need for specialized washing equipment
Exposure of personnel to high-voltage environments
Operational restrictions
Leakage current under contaminated and wet conditions
Risk of pollution-related flashovers
Instead of repeatedly removing contamination, RTV coatings help address the underlying surface behavior that contributes to flashover risk.
RTV Coating distributors and applicators
Midsun IKM works with utilities and industrial operators to distribute and apply RTV coating for high-voltage insulators. Contact the Midsun IKM team for a free consultation.
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