Various implementations described herein relate to systems and methods for determining abnormal leakage current of a capacitor by determining a number of recent leakage current values for the capacitor and determining a maximum upper limit, minimum upper limit, maximum lower limit, and minimum lower limit based on leakage current values different from the recent leakage current values. A present upper limit and a present lower limit are determined for the recent leakage current values. Abnormal leakage current is determined in response to determining that the present upper limit being greater than an upper threshold (determined based on the maximum upper limit and the minimum upper limit) or the present lower limit being less than a lower threshold (determined based on the maximum lower limit and the minimum lower limit).
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