This letter proposes the concept of short-time operation when a ripple current exceeds the allowable value. The operable time is determined using the temperature of the electrolytic capacitor. The temperature characteristics of electrolytic capacitors are measured by applying a pulsating voltage. The calculated value and value measured by experiment are compared for transient temperature changes and operable time. The possibility of estimating the operable time is confirmed through a comparison of transient temperature changes.