Sheath test and fault location, course description
The course provides a basic understanding of how to perform a jacket test. In addition, some recommendations for insulation performance values are given.Jacket failure pre-location with bridge principle is reviewed with illustrations. After prelocalisation, the actual location where digging is to be carried out using the step voltage method. This is illustrated with an A-frame and field lines. The step voltage method is discussed with several faults.
Sheath testing is very important
Most common error, laying HV cables
The sheath is easily damaged when laying HV cables, but it can also happen that the sheath is already faulty when it is delivered. Most commonly, errors occur due to incorrect cable handling or a shovel damaging the sheath.
First and most important test for HV cables
The first prerequisite for a long lifespan of high-voltage cables is that the sheath is tight so that water does not leak in. It is not unusual for water to run out of an HV cable when it is cut. Water can penetrate the PEX/XLPE insulation like water trees and degrade the insulation performance leading to flashover to ground. Sheath testing is simple for underground cables and should be performed for all projects.
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