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TOROIDS, SPHERES &
CORONA NUTS
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Sphere Sizes
0.2 in to 22 in
0.5 cm to 56 cm |
Toroids Sizes
0.75 in to 52 in
1.9 cm to 132 cm |
Geometrically designed to
reduce excessive voltage gradients at connecting points and other areas
needing shielding or balancing of electrostatic fields. Also an
increase withstand voltage by improved grading and minimize corona. Many
diameters are to IEC publication 52 standard metric sizes.
Many
of Ross Engineering's line of toroids, spheres, and corona nuts have been
designed to meet metric dimensions. The Ross toroids are made of aluminum
while most spheres are made of either hollow aluminum or solid non-melting
carbon with other materials optional. A satin finish is standard with a
high polish finish available. Aluminum toroids and spheres are used to
minimize corona and for adjusting voltage gradients on long stacks of high
voltage components. Spheres are also used for spark gaps and corona
eliminating terminations. Carbon spheres are desirable where high current
arcing is involved since they do not melt or develop pits or projections
but tend to remain a smooth surface. Also, with the presence of slight
amounts of Carbon 14, they have a tendency to have more consistent
spark-over levels,
Ross Toroids come
in two separable halves as standard. A one piece toroid is formed by
heliarcing two halves together. Toroids, or hemisphere-toroid
configurations, can be used in place of spheres where height is
limited. Available toroid diameters range from 1.9 cm to 132 cm (0.75 in
to 52 in). Mounting holes are optional and other sizes can be
provided.
Ross Spheres are
available in solid or hollow aluminum, solid carbon, or other materials
upon request. Most sizes recommended by the International Electro
Technical Commission (IEC) are standard. The aluminum spheres are usually
used for limited current spark gaps or for terminations. Diameters of the
standard spheres range from 0.5 cm to 56 cm (0.2 in to 22 in). The
non-melting carbon spheres are used for calibrated spark gaps, lightning
arresters on antennas, power supply overvoltage, and other transient
suppression and high current spark discharge in pulse forming networks.
The solid sphere diameters vary from 1 cm to 30.48 cm (.396 in to 12 in).
Ross Corona
Nuts are a modification of a sphere or toroid shape and are widely
used in moderate high voltage applications. Their recommended operating
voltages are up to 300KV. Diameters of the corona nuts range from .64 cm
to 3.8cm (25 in to 1.5 in).
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