At our monthly staff meeting yesterday afternoon, I made the presentation on our cable rejuvenation project and I believe it was well received. I appreciate the information and PowerPoint slides that your most excellent sales representative supplied.
I did have one question asked that I did not know the answer to—what is the voltage limit of the process? I am sending an e-mail to our department director concerning our project and the benefits of the rejuvenation process in general and I would like to include the answer to that question if possible.
The highest voltage ever rejuvenated was 115 kV. As a practical matter there are not many solid dielectric cables at voltages above 115 kV that are not water-tight designs. However, if there were we would love to treat those too. You see the thicker the insulation the easier it is to treat the cable. The rate of fluid exudation, that is the rate the fluid leaves the cable, is slower the thicker the insulation. Our most technically difficult challenge is the 110 mil thickness 5 kV cables. So there really is no upper limit.
In 2012 we will be unveiling new products to deal with lower voltage cables, so we will be able to treat any solid dielectric cable—any voltage, any non-filled stranded conductor.
The higher the voltage, the thicker the insulation … the thicker the insulation the slower the fluid diffuses out!