The shelf life of capacitors such as accelerator capacitors, pulse capacitors, and electrostatic precipitating capacitors is rarely encountered in ultra-high voltage ceramic capacitors. However, such things still happen. Because such products are often customized according to requirements, long-term inventory rarely occurs. Phenomenon.
But occasionally there will be a situation: the production of mantissa inventory. For example, the customer ordered 1,000 capacitors, actually produced 1020. Then 20 may be in stock until the next order is needed. But such products are often not GM is customized according to requirements, so if the old user does not place an order, it will be difficult to sell. This will save it for the next order cycle.
So, how long can it be kept?
In fact, if the user has two or three orders in a year, this problem basically need not worry. Because the ultra-high voltage capacitor period is different from the low-voltage ceramic capacitor, if the low-voltage ceramic capacitor period is not used for one and a half years, it will gradually discharge. The phenomenon of excessive leakage current is generated. Due to the high voltage, the crystalline structure inside the UHV ceramic capacitor is not very stable, so it takes a long period of self-recovery period. The new off-line UHV capacitors are in stock After one to three months, the quality is the most stable. At this time, it is used with the best function.
But it's not that the longer the self-recovery time, the better. If it is still useless after one year, it may start to show the phenomenon of large leakage current. Therefore, during the storage period, the manufacturer must regularly do charge and discharge tests, every three Doing a charge once a month is the most reliable.