Power Capacitors Technology

The constant research conduct in Ducat energies laboratories has lead to the expansion of a polypropylene film with a special metallization, whose purpose is to favor the self-healing procedure and decrease dielectric losses.

This original metallization treatment, the polypropylene is subjected to less stress during operation. Therefore it maintain its dielectric properties for a significantly longer time while delivering considerably better performance in terms of both current and voltage.

LONG LIFE (Heavy Duty) series - High performance PPMh capacitors - LL-10

This innovative range of industrial power factor correction capacitors quality elements wound with PPMh film sets new values in terms of reliability, presentation and compactness. More effective self-healing and reduced dielectric losses make it possible to obtain a lifespan of up to 150,000 hours and performances in terms of voltage and current that are comparable to those of paper and oil capacitors while reducing size by up to 40%.

Capacitors of this type belong to the families:

●   Series LL-10 Capacitor

●   Series MODULO50 Cylindrical three-phase capacitors

●    LL-10 & Long Life Modulo50 Capacitors

Applications:

Three-phase Modulo50 capacitors are latest from Neptune-Ducati and has been designed for power factor correction in high harmonic current content. They are capable of withstanding 4xIn which is Maximum in comparison to other technologies offered in the market.

Technology:

The capacitor has been made by three elements connected in a delta configuration to keep as low as possible the Stress voltage on the film. The elements are housed into an aluminium can and finally impregnated by natural oil.

Electrical Characteristics:

Each element is made by Metallized Polypropylene.

The metallization has been made in a special "profile" to allow:

●   an higher voltage stress on the film

●   an higher operating over-voltage

●   a better way to control the self-healing

●   An heavy edge to improve the contact from the active area and the spraying head to reach an higher inrush current (more than 300 times rated current)

●   very low losses (less than 0,2 W/kVAr)

The impregnation technology allow:

●   to treat the capacitor in a vacuum

●  to eliminate gas and humidity from the active area

●  impregnate the element

● To control the "partial discharge effect" which is one of the reason to have precocious ageing (life longer than 150,000 operating hours)

Mechanical Characteristics

● the capacitor is equipped with an over-pressure device which allow to protect itself

● from the destructive short circuit coming from an electrical or thermal over-load

● this over-pressure device works on all the three phases

● The oil is the best to transmit to the mechanical safety device, in a shortest way, the over-pressure coming from a destructive short-circuit.

Claw profile

● The capacitor has been equipped with a new claw profile to assure that no leakage can occur during all capacitor's life.