Electric power industry consulting
Faults on cable terminations (as well as cable joints) are a significant problem of cable lines. Termination fault also means that a section of cable inside and near the termination may be damaged too. Therefore, for the installation of a new termination instead of broken one, not only new termination itself is required, but also
1️⃣ As you can see from the photo, the cable screens are grounded directly to the support structure, without the use of link-boxes (I marked screens with yellow lines). This kind of screens connection is not a good solution, because it creates problems for personnel during periodic tests of the cable outer sheath. Let me
The photo shows a 220 kV cable line laid in one of the Central Asian countries. During the construction of the line, cables and couplings (joints and terminations) were used of one of the world famous Asian manufacturers. After several years of operation, the cable joints gave faults one by one, and in total more
In addition to cable and overhead lines, there are mixed lines when, for various reasons, part of the line route is made as an overhead line, and part as a cable one. At the junctions of cable and air sections, special “transition points” have to be equipped. There are a huge number of transitional point
Let me pay attention to one very common mistake that can be very expensive. In the construction of a single-core cables, the main elements are the core and XLPE-insulation. The metal screen (Cu, Al) and the outer sheath of the cable are usually perceived as auxiliary elements of the cable. As a result, people carry
The photo shows the ordinary cable termination of 10 kV, which was overheated due to high currents induced in the screens. We can see traces of excessive heating at the junction of the screen with its grounding wire, caused by significant currents passing there. The quality of the screen and wire connections is a separate
On today’s photo there is a nice modern bright transition tower (pylon, support) for mixed cable and overhead line. What can be advised to improve this facility next time? Unfortunately, many details are not so good:✅ Link-boxes for cable screens.✅ Black pipes which protect cables above the ground level.✅ Red corrugated pipes which protect cables