Eurofarad designs and manufactures film capacitors using a wide range of technologies depending on environmental considerations. In general, Eurofarad impregnates these capacitors with solid thermoset resin such as epoxy, polyester or composites. These technologies result in extremely stable mechanical and electrical properties at temperatures ranging from -55 to +125°C/+155°C and even up to +200°C if required.
Eurofarad's high voltage capacitors are especially recommended because their performance offers optimum results for energy storage, delay lines or low impedance circuits. For these applications, their life expectancy depends on several different factors: form and mode of discharge, frequency of recurrence, mode of operation, climatic condition, etc.
In addition to their standard capacitors, the company's extensive expertise in this field lets it offer capacitors with made-to-order characteristics such as: partial discharge-free capacitors; specific test voltage capacitors; capacitors to individual technical specifications.
The use of plastic film as a dielectric has the following advantages: high electrical and climatic performance; homogenous; consistant repeatability; very thin film which allows smaller size components.
The metallised dielectric technique replaces the metal foil of the armatures of traditional capacitors with a very thin coating of metal on the dielectric film deposited in a high vacuum. This allows further reduction in size and has the additional benefit of an original and important characteristic.
* Self-healing: breakdown due to ageing or overstrain of the dielectric would be permanent in traditional foil armature capacitors. In metallised dielectric capacitors this is a short term phenomenon, as the current of the short circuit volatilises the metallisation at the defective spot and the capacitor is again insulated - hence self-healing.
* Dielectric metallisation: several metals can be used for metallisation of the film. Eurofarad only uses aluminium because of its inherent characteristics. These are: aluminium is a very good conductive material which favours a low loss angle; the residue of self-healing is alumina, which is a very good insulating substance and consequently is non-polluting within the capacitor.
* Foil armature capacitors: for use in particular cases when this technique is necessary (very small capacitors, high current, etc.) the company manufactures traditional foil armature capacitors.
* Composite dielectric capacitors: the use of two different dielectrics in the same capacitor sometimes proves interesting and allows the advantages of two dielectrics. For example, in the case of the metallised composite capacitors this technique makes impregnation easier, avoids ionisation and gives excellent long term stability in all environmental conditions.
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