Characteristics of Vacuum Capacitors

2023-05-31

A vacuum capacitor is a capacitor with vacuum as its medium. The electrode group of this capacitor is a group of concentric cylindrical electrodes formed by extending high-conductivity oxygen-free copper strips through a set of high-precision molds one by one and sealed in a vacuum container. Therefore, its performance is stable and reliable, and it is not easy to produce arcing, corona and other phenomena.
Characteristics of Vacuum Capacitors

Compared with capacitors of other media, vacuum capacitors have the characteristics of high withstand voltage, small volume, low loss, stable and reliable performance, etc. It is unique in the following aspects:

Rated voltage—Due to the high insulation strength of vacuum, coupled with dust-proof, moisture-proof and other characteristics, vacuum capacitors have a large rated voltage value for a certain size and capacity. High up to hundreds of thousands of volts.

Small loss, large rated current - because the capacitor adopts vacuum medium, low loss insulating shell and oxygen-free copper electrode structure, it can pass a large current even at a high frequency under the general convection cooling condition. If a special water cooling structure is used, the radio frequency current can reach thousands of amperes.

Space saving—vacuum capacitors take up the least amount of space for a given capacitance and voltage rating.

Wide adjustment range—the ratio of the maximum capacity to the minimum capacity is as high as 150:1, which can be from a few picofarads to several thousand picofarads, making it an ideal component for a wide tuning range.

Self-healing against overvoltage—Vacuum capacitors can withstand momentary overvoltages that, for other capacitors, would cause permanent damage.

High Altitude Capability—Vacuum sealing allows vacuum capacitors to operate at high altitudes without degrading their characteristics.