The standard utilizes a fundamental formula to correlate current, time, and material properties. The non-adiabatic effects can be factored in for durations longer than a few seconds, but the adiabatic formula serves as the safe baseline.
Obtains the final value by multiplying the adiabatic current by the modifying factor. Core Formula
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cap I sub cap A cap D end-sub equals the fraction with numerator cap K cross cap S and denominator the square root of t end-root end-fraction cross the square root of l n open paren the fraction with numerator theta sub f plus beta and denominator theta sub i plus beta end-fraction close paren end-root : Cross-sectional area of the conductor ( m m squared : Duration of the short circuit (maximum 5 seconds). : Initial and final temperatures ( raised to the composed with power cap C : Material-dependent constants for copper or aluminum. Non-Adiabatic Effects
IEC 60949 PDF Free Download Exclusive: Mastering Thermal Short-Circuit Calculation The standard utilizes a fundamental formula to correlate
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The primary calculation for permissible adiabatic short-circuit current is: : Initial and final temperatures ( raised to
Useful for PVC, XLPE, and EPR insulated cables. Key Concepts in IEC 60949 Calculations