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ESTAprop® PhMKP-type capacitors in cylindrical aluminum casing have been designed for Power Factor Correction in low voltage plants. Loads as motors and transformers consume real power as well as reactive power. Generators, supply cables, and other electrical distribution equipment should be relieved from reactive power.
The ESTAprop® MKP capacitor is a metallized polypropylene film capacitor with self-healing properties. The current carrying metal layer of an MKP capacitor is vaporised onto one side of the polypropylene film. The front surface of tubular winding elements are joined by means of the metal spray method (schooping). Three winding elements are encapsulated in one aluminum casing and connected to form a true 3-phase capacitor. The overpressure tear-off fuse prevents the capacitor from bursting at the end of service life, or due to inadmissible electrical or thermal overloads.
The assembly is impregnated with a natural oil (fire point > 300 °C) under vacuum and hermetically sealed. This construction method ensures excellent heat dissipation and constant capacitance over an extended period of time.
The capacitor is housed in a tubular aluminum container with a metal lid press-rolled onto it. The current is supplied via screw-on (M5) or push-on (6.3 * 0.8 mm) connectors. A threaded stud (M12) at the bottom of the container serves for both grounding and mounting.
ESTAprop® and ESTAdry® capacitors will be delivered together with discharge resistors and hardware for mounting and connection.
Vishay ESTA standard capacitors of 84.4 mm diameter will come with a THICK FILM DISCHARGE RESISTOR UNIT, forked terminals for easy mounting and IN-LINEconnection of the capacitors to the supply.
Capacitors are in accordance with protection class IP00. For all types, plastic covers for a higher degree of protection are available.
All oil-impregnated part types can also be produced in a PhMKPg dry version. Dimensions and ratings are unchanged. Dry types are not standard stock items, with production upon request.
