Underground Power Cable Failure

Other causes include mechanical injury during transportation laying process or due to various stresses encountered by the cable during its working life.

Underground power cable failure.

Excessive heating of the cable will cause degradation of the insulation and sheathing material and premature failure. Not all underground cable system failures are due to cable insulation. 1 risks reducing cable reliability because it depends on physically cutting and splicing the cable. Open circuits are usually the result of failed connectors or broken and or corroded conductors.

The lead sheath is. The use of underground cables is essential in power distribution networks as they mitigate the issues related to space availability and minimise line breakdown and increase system reliability. Open circuits are more common in low voltage cables than at medium or high voltage. Sectionalizing this procedure as shown in fig.

However the detection and localization of cable fault is challenging due to the limited access to the cable burned under the ground. Causes of faults in underground cables most of the faults occur when moisture enters the insulation. Final results of a failure a cable failure almost always exhibits itself as either an open circuit or a short circuit. A substantial percentage occurs at splices terminations and joints.

Major causes are due to water ingress and poor workmanship. Heat shrink covers can be used to waterproof these junctions and improve reliability. Dividing the cable into successively smaller sections will enable you to narrow down the search for a fault.