The NG DRY A.C. MOTOR RUN CAPACITORS
are manufactured with a dielectric material that consists of
two sheets of polypropylene film. Each one with a thin layer
of vacuum deposited metal on one side. Metals are selected according
to final application aluminum/zinc and zinc. Both films are
acting as electrodes in the capacitor; because this metal is
just a few hundred amstrongs thick, it has a very limited current
carrying capability at any single point in the dielectric. To
compensate this limitation, the entire edge of each electrode
is bonded by a metallized endspray that has a relatitively high
current carrying capability. The endspray serves as the termination
point for the internal connections of the capacitor, this construction
minimizes the current at any single point of the electrode.
This current capability is enhanced by soldered or welded end
terminations.
These capacitors are self-healing,
a property of the metallized film to restore itself to an operating
condition when a dielectric breakdown occurs during operation.
The thin metal layer around the
fault point will act like a low current carrying fuse. Under
a fault condition the current will evaporate the metal around
the fault point and clear the fault. This is accomplisshed by
special frame work of the film with a specific ohmic resistivity
and low melting point temperature the evaporation of the electrode
will result in a capacitance loss that is virtually unmeasurable.
All films for capacitors have particularly low dielectric losses,
high level of insulation and dielectric strength.
The NG DRY A.C. MOTOR RUN CAPACITORS
are manufactured with a dielectric material that consists of
two sheets of polypropylene film. Each one with a thin layer
of vacuum deposited metal on one side. Metals are selected according
to final application aluminum/zinc and zinc. Both films are
acting as electrodes in the capacitor; because this metal is
just a few hundred amstrongs thick, it has a very limited current
carrying capability at any single point in the dielectric. To
compensate this limitation, the entire edge of each electrode
is bonded by a metallized endspray that has a relatitively high
current carrying capability. The endspray serves as the termination
point for the internal connections of the capacitor, this construction
minimizes the current at any single point of the electrode.
This current capability is enhanced by soldered or welded end
terminations. 