All Film

This type is composed of several layers of polypropylene film with a rough surface, held between aluminum plates.

Electrodes:

Are made of a thin sheet of pure aluminium. The extended foil winding construction gives the capacitor a very high resistance to peaks of current that occur during Energizing.

Impregnating substance:

It is a nontoxic, biodegradable, synthetic oil with a chlorine content <5 PPM. Particular attention is given to the various phases of processing, to the oil impregnation of the dielectric and the drying process. The drying is carried out leaving the material for a long period in the autoclave under controlled environment, heating it to high temperature, where, at the end of the treatment, it reaches molecular vacuum. The treatment of the oil prior to use includes degassing and chemical depuration.

Case:

The capacitor case is made of sturdy welded steel sheet which can withstand the normal stress produced by breakdowns. It is completely full and does not contain air bubbles: the perfect sealing of the container guarantees against deterioration of the materials, thus ensuring a long life of the capacitor.

The elasticity of the larger surfaces of the case compensates for the variations in the volume of the impregnating liquid in the range of the temperatures during operations, thereby keeping the variations in the internal pressure to a minimum.

The container is also fitted with two handles to use for lifting and fixing the capacitor on the installation frame. Upon request capacitors destines for use in aggressive environments can be provided with ta stainless steel container.

Terminals:

The capacitor terminals are soldered on the porcelain bushings, glazed for perfect resistance to atmospheric elements. The porcelain bushings are metallized for both fastening to the capacitor cover and for fixing to the screw terminal connections. The bushing are perfectly sealed and particularly sturdy. Th screw terminals can withstand repeated torque stress of 30 Nm.

Flexible connections must always be used for electrical connections to the terminals. Normally the single-phase capacitors have both terminals insulated from the container.

Discharge devices:

In conformity with standards the capacitors are internally fitted with discharge resistors for reducing the residual voltage to less than 50V within 5 minutes of shutdown.

Environmental Compatibility of the Materials Used:

The impregnating agent used is the result of long and continuous research and experimental tests on all insulating oils for dielectric use currently available. It offers the best solution, taking into account the need to protect the environment along with the need to have high dielectric characteristics, the two requirements which have often been considered incompatible.

The impregnating agent is non toxic; its oral toxicity level (LD 50) is over 3 g/kg. Moreover, since these oils can be completely eliminated from human and animal bodies, there is no problem of accumulation.

The impregnating agent biodegrades rapidly in the environment, therefore, no special precautions are required to prevent the dispersion of oil into the ground in case of accidental leakage from the case.

It consists of the compounds of carbon, hydrogen and oxygen, the combustion of which produces carbon dioxide and water. These liquids are not considered dangerous and their registration is normally not required. However, the storage and destruction of the capacitors must be in accordance with current regulations in place of use.