You won’t be able to fix your power cable if you cannot determine the real cause of the failure. Electric power cable manufacturers are discussing major failure modes that are responsible for breakdown of power cables. You should read about them and try to avoid them from occurrence in future to prevent cable failure or breakdown.
- Underground cable
A major concern about underground cable is electrochemical treeing. Treeing occurs when moisture enters to the electric field lowers the dielectric strength of cable insulation. When the dielectric strength of the power cable degraded sufficiently, transients caused by switching or lightning can lead to dielectric breakdown.
To prevent electrochemical treeing, a utility can employ surge protection on riser poles, can have tree-retardant cable, and can check cable reels prior accepting them from the manufacturer.
- Failure of transformers
Transformers are critical power systems that can consume your all time during replacement, if failure happens. Faults bring extreme stress on the windings, and are real causes of transformer failure.
When a transformer temperature rises, the insulation on the windings breaks down slowly and becomes brittle after some time. Overloading is the second reason that causes ageing of the transformer. When thermal ageing makes the insulation more brittle, it shakes the windings and forms crack in the insulation.
Lightning occurs when the voltage generated between the ground and a cloud exceeds the air dielectric strength. This results in massive current stroke. Lightning is a critical concern for facilities located in high keraunic location.
You can prevent lightning by:
- Having a high system BIL
- Using surge arrestors to clamp voltages throughout the equipment
- Using shield wires
- Having a low impedance ground
- Tree Contact
You cannot stop a tree from growing. It can be dangerous thing if any power system is surrounded by tree as it can fall over onto conductors and can drop branches, push conductors together, and can be used by animals as a pathway.
This can be prevented by using tree wire, which is overhead wire with an insulated jacket just like cable. This can be an effective solution to prevent power system failure.
To know more reasons and their solutions, you can anytime talk to electric power cable manufacturers. Just mail them about your requirements related to power cables and avail premium range for your facility. Feedback for this post is also open, you can make comments below.