To ensure the reliability of power supplies in regions with fluctuating supply voltages, electrolytic capacitors with a rated voltage of 450V are often used. These capacitors have a permissible peak voltage (surge voltage) of 500V, which may occur up to a thousand times for a maximum duration of 30 seconds during the capacitor's service life.
There must be a pause of at least five and a half minutes between two overvoltage events (IEC 60384-4).
A special requirement for the surge resistance of power supply electrolytic capacitors comes from the construction or modernisation of buildings: in the event of a wiring error in the low-voltage distribution (swapping of phase and neutral conductor), up to 570V can be applied to the electrolytic capacitor. In the worst case, this error remains undetected for several days and would lead to failure in a standard component.
To avoid these failures, electrolytic capacitors with a higher rated voltage could be used. However, this option has the disadvantages of poorer current carrying capability, larger dimensions and, last but not least, higher costs. Jianghai offers a technical solution with a 450V electrolytic capacitor, which is subjected to a higher post-forming voltage during production and can thus withstand the high overvoltage of 570V at room temperature and without ripple current load for up to ten days.
Jianghai's customised electrolytic capacitors combine technical solutions tailored to the respective application with good cost efficiency and are available for orders starting from the minimum order quantity listed in the catalogue – please feel free to contact us for more information.
If you have any questions, we are happy to help:
Dr Arne Albertsen
Tel.: 0049 / 2151 / 652088-22
Email