Examination of discharges formatting on plastic covered electrodes
Study and examination of covered electrodes is one of the essential aspects of review and designing electrical structures like distributed transmission lines.
Also, other structures like rotating blades of wind turbines or even nonelectrical structures like insulated roofs can be affected by different types of discharges like lightning. So, it is imperative to predict any kind of possibility in the case of discharges in these structures, as in some cases, the uncontrolled and unforeseen extra voltage can have really harmful damages.
In this project, we desired several experiment and measurement to see the effects and behavior of discharges in the case of insulated wire,
We used a partially covered wire and different power sources, and we aimed to determine how will breakdown form while we have both insulated and not covered wire with varying the position of the covered part and vary the distance between the electrode tip and our objected part, we aimed to observe whether the breakdown will be formed in the covered part of it or it will be formed in the not insulated part; however, there is less distance for forming any breakdown channel in covered part.
We can conclude, there is a critical length that is necessary at least to form a breakdown in the insulating layer of wire. Otherwise, the breakdown will hit and be formed in the not covered part; meanwhile, there is more distance between the electrode tip and the first point of not covered part. For other examples, we can expand this result to other cases such as insulated roofs or rotating blades in wind turbines.
There are more other factors also influencing the type and shape of discharges which are necessary to take into consideration like the type of applied voltage (AC, DC, Impulse…), the distance between objects, shape, size, and structure of objects, type, and strength of insulators, humidity, pressure, etc.
Belkin A.: Recovery of Alumina Nanocapacitors after High Voltage Breakdown, Scientific Reports. 7. et., al. (2017)
Tóth Y., Kiss I., Németh B., Szedenik N.: Relation Between The Material of Roof and The Risk of Lightning Caused Damage, (2019)
Villamosmérnöki szak, mesterképzés
Dr. Kiss István
egyetemi docens, Villamos Energetika Tanszék