| Electrical Treeing |
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| CATEGORIES ABOUT ELECTRICAL TREEING | |
| dielectrics | |
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OCCURRENCE AND CAUSES Treeing occurs when a dielectric material is subjected to excessive High Voltage stress over a long period of time. Treeing is observed to originate at points where impurities, Gas voids, or mechanical defects cause excessive Electrical Field stress within small regions of the dielectric. This can Ionize gases within the void, creating small Electrical Discharge s between the walls of the void. An impurity or defect may even result in the partial breakdown of the solid dielectric itself. Ultraviolet Light and Ozone from these discharges then react with the nearby dielectric, decomposing and degrading it. Gas es are often liberated as the dielectric degrades, creating new Void s and cracks that may further accelerate the PD process. Over time, a branching 3D tree-like figure is formed within the dielectric. The tree can grow to the point that it eventually causes complete electrical failure of the dielectric. In similar fashion, 2D treeing can occur along the surface of a highly stressed dielectric. Over time, the growing partially conductive trail can result in the complete failure of the dielectric. These branching 2D and 3D figures are sometimes called Lichtenberg Figure s. |
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