How to treat Aluminum Electrolytic Capacitor after long-term storage at high temperature?

Publish Time: 2024-06-10
After long-term storage in high temperature environment, the performance of Aluminum Electrolytic Capacitor may be affected to a certain extent, so it needs to be properly treated before use to ensure its normal operation and extend its service life.

First, when Aluminum Electrolytic Capacitor is stored at high temperature for a long time, the electrolyte inside it may change, resulting in increased leakage current and decreased electrical characteristics. Therefore, before use, it is necessary to apply the rated voltage to restore its electrical characteristics. This treatment process is usually achieved by connecting a protective resistor of about 1KΩ in series and continuously loading the rated working voltage for 30 minutes to 60 minutes.

Secondly, for capacitors that have been stored for more than 6 months, voltage treatment is particularly important. By applying the rated voltage, the oxide film inside the capacitor can be repaired and the leakage current can be restored to the level before placement. This is because long-term high-temperature storage may damage the oxide film inside the capacitor, resulting in increased leakage current.

In addition, the various characteristics of Aluminum Electrolytic Capacitor have a significant dependence on temperature. The higher the temperature, the faster the capacitor deteriorates, and the leakage current increases, the loss tangent increases, and the electrostatic capacitance decreases. Therefore, the performance of capacitors stored for a long time in a high temperature environment may have changed significantly, and a comprehensive inspection and treatment is required.

In general, after long-term storage at high temperature, Aluminum Electrolytic Capacitor needs to be treated with rated voltage to restore its electrical characteristics and undergo a comprehensive inspection to ensure its normal operation and extend its service life. At the same time, in order to maintain the good performance of the capacitor, long-term high-temperature storage should be avoided as much as possible, and attention should be paid to moisture and dust prevention during storage.

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