go to the Air-insulated switchgear product page Anonymous asked on Jan 13th, 2015 in Air-insulated switchgear

How does high altitudes affect the circuit breaker performance?

Christian Cingolani, Global Product Marketing Manager LTB

ABB's answer

The external dielectric strength becomes reduced at higher altitudes due to the lower density of air. Standard dielectric type tests are valid for installations up to 1000 masl. For verification of the suitability of installation at higher altitudes the test voltages has to be corrected. Correction factor according to standard has to be used for external insulation. (IEC 62271-1)


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  • Helene Hedlund

    Helene Hedlund

    Global Product Manager LTB

    High Voltage Products

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