Compensation capacitor LKT 28.2-440-DP

FRAKO power capacitors have been developed and manufactured for decades solely at the company's Teningen production site in Germany. This has resulted in a consistently high product quality being maintained, the basis for assured operational reliability and a long service life.
The use of rigorously inspected materials and their careful processing guarantee high quality and a long product service life.
FRAKO manufactures its capacitors to its own in-house specifications, which are far more demanding than the requirements
of the applicable standards.
Quality control inspections after each individual manufacturing step
ensure that the final product is of a high quality. These demanding
quality standards, together with specially developed manufacturing
technology, enable FRAKO power capacitors to achieve a longerthan-average service life. At the end of the manufacturing process
each capacitor is inspected individually. The in-house requirements for this special inspection are considerably more stringent
than those of the routine tests specified by the relevant standard.
Reliability under Overload Conditions
The reliability of the capacitors is of fundamental importance
for the uninterrupted operation of power factor correction systems. For this reason FRAKO has developed its unique triple
safety concept. This comprises:
■ Self-healing polypropylene film
■ Overpressure disconnection system
■ Segmented metallized film surfaces

The overpressure disconnection system is designed to disconnect
the capacitor from the network safely, without causing any further
upset, if an excessive pressure develops inside the casing or at the
end of the capacitor’s working life. The lid of the capacitor is in the
form of a diaphragm. Should puncturing of the dielectric occur on a
large scale, this results in the substrate film melting and generating
gas inside the casing, thus building up pressure. This causes the
diaphragm lid to bulge outwards, thus displacing the terminals axially so that the internal leads to the coils act as mechanical fuses,
breaking cleanly at defined locations. The relatively long travel of
the terminals ensures reliable and safe disconnection, while the
bulging of the lid increases the internal volume and therefore reduces the pressure inside the capacitor.
The segmented film improves both these safety functions significantly. If puncturing occurs at several locations over a small area, it
is possible that the relatively large amounts of energy involved will
disrupt the effectiveness of the self-healing property. In this case,
the segmented metallized surface offers ADDED safety, since an
extremely overloaded segment will be completely isolated from
the network, thus avoiding total disconnection by the overpressure
function. This greatly extends the service life of the capacitor