Vacuum Capacitor Cooling Procedures

Temperature limits the maximum power that vacuum capacitors can provide. The more current applied to a vacuum capacitor, the more heat is generated, resulting in internal and surface temperature rise in capacitors. Standards for maximum temperature in glass and ceramic vacuum capacitors follow a general guideline that is not to exceed 85 C for glass capacitors and 125C for ceramic. Therefore, cooling applications are essential for capacitors, allowing for them to achieve maximum current, while maintaining a suitable temperature.

There are four standard guidelines for capacitor cooling and heat dissipation. These include water-cooling, conduction cooling, forced air-cooling and convection cooling. Water-cooling is the most effective of the four, cooling from the inside. Water is pumped through the capacitor's bellows, at a specific pressure, keeping the interior of the capacitor cool. Capacitors in ceramic envelopes most commonly use this form of cooling.

Conduction cooling also uses water to cool capacitors, but in a different way. An additional heat sink or cold rail device is mounted onto the capacitor, keeping the unit cool by dissipating heat. Jennings has developed a cold sink flange that clamps a water jacket outside the unit, cooling capacitors from the outside.

The third guideline used is forced air-cooling, which blows surrounding air onto the product by a fan. Although successful in stabilizing temperatures, it does not always offer contamination-free results. The environment must be taken in account when using this type of cooling.

The last cooling method is convection, which cools the capacitor naturally. Vacuum capacitors are placed in an open chamber, with sufficient access to air. The chamber permits for free air circulation, allowing the unit to find equilibrium in its surrounding environment. This allows for the exterior parts of the capacitor to be cooled, but it does not directly affect the interior bellows or plates sets. Although not as efficient as water or forced-air cooling, convection cooling is successful in many applications.

Cooling procedures are essential to the life of capacitors in order to achieve maximum current. Jennings offers special cooling products that assure optimal results from our capacitors.

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