LV Capacitors
INTRODUCTION
The power factor correction system main component is capacitor on board: it is therefore important to choose it solid and of good quality.
In our power factor correction systems we only use our capacitors production, made entirely from ICAR: in this way, we can offer to our customers the highest guarantee of the equipment reliability. The capacitors used are divided into three different types, which lead to electrical and thermal performance completely different.
High gradient metallized polypropylene capacitors
High gradient metallized polypropylene capacitors vacuum impregnated
bimetallized paper capacitors
High gradient metallized polypropylene capacitors
| Temperature category | Loss of capacitance | Voltage withstand | Allowed current overload | Peak current withstand | Life expectancy at -25/D | Life expectancy at climate category |
| -25/D | low | very good | good | very good | 100.000h | 100.000h |
They are made by wrapping a metallized polypropylene film, refin filled.
The metallization thickness modulation allows to greatly improve the capacitors (and therefore of the power factor correction systems which are the fundamental component) in terms of:
- Increase in power density (kvar/dm3) with a consequent power size reduction of the power factor correction systems;
- Robustness improvement against voltage surges, for greater reliability even in systems with the presence of voltage fluctuations due to the network or maneuvers on the system;
- Improved behavior of the internal short circuit withstand.
High gradient metallized polypropylene capacitors vacuum impregnated
| Temperature category | Loss of capacitance | Voltage withstand | Allowed current overload | Peak current withstand | Life expectancy at -25/D | Life expectancy at climate category |
| -25/+70 °C | negligible | very good | very good | excellent | 150.000h | 100.000h |
They are made by wrapping a polypropylene film of increased thickness. The production process involves a passage in the autoclave in order to eliminate humidity and air and hermetically filled with non toxic insulating oil.
Bimetallized paper capacitors
| Temperature category | Loss of capacitance | Voltage withstand | Allowed current overload | Peak current withstand | Life expectancy at -25/D | Life expectancy at climate category |
| -25/+70 °C | negligible | excellent | excellent | excellent | 200.000h | 130.000h |
The bimetallized and impregnated paper capacitors are now the most robust solution for industrial power factor correction.
They are made by wrapping a thin sheet of special paper on the surfaces of which is deposited by evaporation process, a infinitesimal layer of metal alloy with function of electrode; between the sheets of paper is placed a polypropylene fi lm with only the dielectric role between electrode.
The ICAR bimetallized paper capacitors are particularly suitable for applications in plants with high harmonic content currents and/or high operating temperatures.
