What is water treeing?

Water treeing is a phenomenon that occurs in high-voltage electrical cables and insulation systems, particularly those that are made of polyethylene or cross-linked polyethylene. It involves the formation of branching patterns in the insulation material that resemble the branches of a tree. These branches are formed by the accumulation of water or moisture that is present in the insulation material.

The water or moisture in the insulation can be caused by a number of factors, including environmental conditions, manufacturing defects, or damage to the cable or insulation system. Over time, the moisture can cause the insulation to break down, leading to increased electrical stress and the potential for electrical breakdown or failure.

Water treeing can be a serious problem for high-voltage electrical systems, as it can lead to reduced reliability and potentially catastrophic failures. To prevent water treeing, it is important to properly install and maintain electrical cables and insulation systems, as well as to use materials that are resistant to moisture and water ingress. Regular testing and inspections can also help to identify and mitigate the risk of water treeing.