High Altitude, High Humidity, And Salt Spray Environments: Adaptive Design Of Vacuum Circuit Breakers Draws Attention - News

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Products Description

Under certain conditions, such as at high altitudes, in high humidity and in salty air, the proper operation of vacuum circuit-breakers faces various challenges.

At high altitudes, the thin air can reduce the rated voltage of external protective equipment.
High humidity and sea spray can accelerate the corrosion of metal components.

Furthermore, dirt on the protective equipment can lead to an explosion. The vacuum extinguishing chamber is completely airtight, so that neither external pressure nor moisture can penetrate; however, the operating system, the external protective housing and the secondary circuit must be specially designed.

For high altitudes

According to national standard GB/T 11022, when the altitude exceeds 1,000 meters, the external insulation withstand voltage must be corrected by a coefficient. In design, creepage distance is usually increased, and composite insulation bushings or fully embedded poles are adopted to compensate for the reduced air insulation strength. At the same time, heat dissipation and lubrication of the operating mechanism also need to account for the effects of low air pressure.

For high humidity and salt spray

Coastal and hot-humid areas require circuit breakers with stronger corrosion resistance. Metal parts are mostly made of stainless steel or hot-dip galvanized, with anti-corrosion coatings applied to surfaces; the mechanism enclosure is upgraded to protection class IP54 or above, and heating and dehumidifying devices are installed to prevent condensation. Salt spray testing is carried out in accordance with GB/T 2423.17 to verify product corrosion resistance. Secondary wiring uses sealed connectors to prevent moisture ingress.

Reliable operation in harsh environments

At present, in scenarios such as coastal wind farms and plateau photovoltaic power stations, vacuum circuit breakers with the above adaptive designs have already been applied. State Grid Corporation of China's Eighteen Major Anti-Accident Measures for Power Grids also emphasize that switchgear in special environments should strengthen anti-pollution flashover, anti-corrosion, and anti-condensation measures. Only through comprehensive design in insulation, corrosion protection, and sealing can vacuum circuit breakers operate reliably in harsh environments.

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