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Corona discharge usually forms at highly curved regions on electrodes, such as sharp corners, projecting points, edges of metal surfaces, or small diameter wires. The high curvature causes a high potential gradient at these locations so that the air breaks down and forms plasma there first.
A scorotron (from screen controlled corona [1]), also called a corona grid, [2] is a device which creates corona discharge current, used in xerography. Scorotrons appear in photocopiers , in xeroradiography equipment, [ 3 ] and similar applications.
The purpose of the corona ring is to distribute the electric field gradient and lower its maximum values below the corona threshold, preventing corona discharge. Corona rings are used on very high voltage power transmission insulators and switchgear , and on scientific research apparatus that generates high voltages.
In older printers, a corona wire positioned parallel to the drum or, in more recent printers, a primary charge roller, projects an electrostatic charge onto the photoreceptor (otherwise named the photoconductor unit), a revolving photosensitive drum or belt, which is capable of holding an electrostatic charge on its surface while it is in the dark.
Special wiring rules apply to wet or corrosive locations, [13] and to locations which present an explosion hazard. [14] Wiring materials for use in the United States must generally be made and tested to product standards set by NEMA and Underwriters Laboratories (UL) and must bear approval marks such as those set by UL.
For smooth, polished wires, m v = 1. For roughened, dirty or weathered wires, 0.98 to 0.93, and for cables, 0.87 to 0.83, namely the surface irregularities result in diminishing the corona threshold voltage. r is the radius of the wires in cm. S is the distance between the center of the wires. g v is the "visual critical" electric field, and is ...
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Many sites recommend using a potting product to protect sensitive electronic components from impact, vibration, and loose wires. [2] In the potting process, an electronic assembly is placed inside a mold (the "pot" [3]) which is then filled with an insulating liquid compound that hardens, permanently protecting the assembly. The mold may be ...