[Explanation of the Causes of Capacitor Failure] A case where a short circuit occurred due to overvoltage and smoke was emitted.
Please ensure that you thoroughly check the voltage fluctuations and choose a capacitor that meets the conditions!
We would like to introduce a case where the pressure relief valve of an aluminum electrolytic capacitor used in the power supply section operated and emitted smoke. The cause was that an overvoltage was applied to the aluminum electrolytic capacitor due to fluctuations in the input voltage, resulting in a short circuit of the capacitor. Current flowed through the capacitor, causing it to heat up and generate gas from the electrolyte. The pressure inside the capacitor increased due to the generated gas, causing the pressure relief valve to operate, and the electrolyte was ejected in aerosol form. 【Countermeasures】 <Check the voltage applied to the capacitor> ■ Is there any voltage fluctuation? ■ Does the peak value (V top) of the fluctuating voltage exceed the rated voltage? ■ Does the negative peak value (V bottom) of the fluctuating voltage exceed zero and become reverse voltage? ■ Is the range of fluctuation of the peak value excessively large? *For more details, please refer to the PDF document or feel free to contact us.
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Please be aware of the following: ■ If the capacitor overheats abnormally, it may short-circuit and ultimately catch fire. ■ If the vaporized electrolyte is ejected like an aerosol and there are flammable materials nearby, it may lead to a fire spreading. *For more details, please refer to the PDF document or feel free to contact us.*
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If you see the following symptoms in a capacitor, it is faulty: - The case is swollen (bulging) - There are cracks in the case - There is a gap between the case and the sealing part - The pressure valve has activated (the pressure valve has opened) - The case has burst - It is hot or generating heat - Smoke is coming out - There is liquid leakage - There are unusual sounds - There is an unusual smell *For more details, please refer to the PDF document or feel free to contact us.
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AIC tech handles Aluminum electrolytic capacitors and Film capacitors for industrial market. Our capacitors have a history of more than 70 years and have their origins in technological development in Japan. AIC tech delivers high-value, precision capacitors tailored for power electronics—from renewable energy and industrial systems to transportation, ICT/IoT, healthcare, and infrastructure. Please feel free to contact us if you have any requests.