![]() ![]() The X/R ratio affects the dc component, and therefore, also the total current. The DC component makes the symmetrical current become asymmetrical.DC component (non periodic and decays exponentially with a time constant L/R L/R is proportional to X/R).AC component (varies sinusoidally with time), also known as symmetrical current.When a short circuit occurs, the total short circuit current consists of: This analysis determines the maximum available fault current in the system, and hence the maximum level that the electrical equipment should be able to withstand. Short circuit analysis is a critical piece of the engineering study for a power system. This article provides pointers to avoid making the mistake. A common misinterpretation occurs when one compares the symmetrical short circuit current against the symmetrical short circuit current rating of the circuit breaker for the purposes of circuit breaker duty evaluation. In such cases, the rating only reflects the AC component of the short circuit current. ![]() Circuit breaker nameplates sometimes indicate only rating on symmetrical short circuit current.
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