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The correct designation is likely:
Engineers must follow a structured workflow to correctly size a high-voltage surge arrester according to network conditions: Determine Continuous Operating Voltage ( Uccap U sub c iec 600995 pdf link
You can find the official version and detailed publication information at the following sources:
Application of arresters for systems with voltages above 1 kV. ) metrics to accurately reflect the stress tolerances
) metrics to accurately reflect the stress tolerances of modern zinc-oxide varistors.
For the most accurate and safe design, accessing the official via the IEC Webstore is strongly advised. This standard provides information
The current valid version is . This standard provides information, guidance, and recommendations for the selection and application of surge arresters in three-phase systems with nominal voltages above 1 kV.
The IEC 60099 family is composed of several parts, each addressing a specific type or application of surge arrester:
