I. Pain Point Focus: Insulation Failure Mechanism and Coastal Flashover Evidence
Core Problem: Insulation performance is the cornerstone of vacuum Load Break Switch (LBS) operational safety. Currently, some products use standard epoxy materials for insulation components, which exhibit poor weather and pollution resistance. In complex environments—such as high humidity, heavy pollution, or salt spray—these materials are prone to moisture absorption, contaminant accumulation, and cracking. This leads to a decline in dielectric strength, eventually triggering surface flashovers or insulation breakdown, causing equipment malfunction or power interruptions.
Typical Case: In a 15kV distribution network of a coastal town, 15 vacuum LBS units were deployed. Because they lacked anti-salt spray treatment and used standard epoxy insulation, severe salt spray corrosion and pollution built up on the insulation surfaces after just over a year of operation. Frequent audible flashover discharges occurred during humid weather. Following a period of heavy rain, two switches suffered insulation breakdown due to moisture and flashover, triggering a line short circuit. This resulted in a 5-hour blackout for over 200 households and required the full replacement of the switches, with direct losses exceeding 80,000 RMB.
II. Triple Reinforcement: Synergistic Upgrade of Material, Structure, and Scenario
Addressing the core pain point of insufficient insulation and environmental factors like salt spray and humidity, this solution optimizes three dimensions to eliminate flashover and breakdown risks:
Upgrade Insulation Material: Abandon standard epoxy in favor of high-performance APG (Automatic Pressure Gelation) cast resin for insulators and bushings. The integral casting process ensures a bubble-free and void-free structure, increasing dielectric strength by over 30% compared to traditional materials. Anti-aging, anti-fouling, and moisture-proof additives are included to enhance weather resistance, allowing the components to withstand extreme temperatures from -20°C to 60°C.
Optimize Insulation Structure: Utilize a shed-type (umbrella) insulator design to increase the surface area for heat dissipation and hydrophobicity. This reduces the accumulation of pollutants and condensation, preventing surface flashovers at the source. Sealed insulation designs are applied to grounding points and conductive connections to block moisture and contaminants, preventing insulation aging.
Scenario-Specific Insulation Treatment: For complex environments such as coastal or chemical areas, insulation parts receive an additional spray-on anti-salt spray and anti-pollution coating. In high-humidity or high-pollution scenarios, sealed protection is reinforced to ensure insulation performance remains adapted to various rigorous working conditions.
III. Empirical Results: Zero Flashovers and a Leap in Power Reliability
By implementing this solution, the insulation performance of vacuum LBS is significantly enhanced. The equipment can effectively resist the impact of humidity, salt spray, and pollution, eliminating issues like moisture absorption, fouling, and cracking. Flashover and breakdown hazards are thoroughly resolved, leading to a substantial decrease in equipment failure rates. Based on the documented cases, this approach prevents power outage losses and equipment replacement costs caused by insulation failure, extends the equipment's service life, and improves the overall reliability of the distribution network.
Success Case Details:Salt Spray Protection Upgrade for Coastal 15kV Distribution Vacuum LBS: 15 Units Operating with Zero Flashovers, Annual Loss Avoidance Exceeding 100,000 RMB-Rockwill
