Electric power industry consulting
It is quite common to lay cables underground in pipes (let me please not use the word duct or conduit). There are probably three main ways to place pipes in the ground:➡️ at the bottom of a trench;➡️ in the borehole prepared by horizontal-directional drilling (HDD);➡️ in the channel prepared by puncturing the ground. The
The materials of the outer sheath of cables usually differ depending on whether the cable is laid in the ground or above the ground (in places where oxygen is available). To avoid cable fires (for example, due to a short circuit), cables for open laying are provided with a non-flammable outer sheath. However, when laying
There are projects where reserve cables or reserve pipes/ducts are provided (empty or with a cable in them). Of course, this complicates the project and makes it more expensive, but maybe it’s worth it? It looks like we are talking about “insuring” a cable line in case of trouble, but the problem is that even
When laying cable lines in the ground, there are several different ways to provide mechanical protection for cables. The following options are known:1️⃣ Covering the cable with bricks on top.2️⃣ Covering the cable with polymer tiles/covers.3️⃣ Laying cable in pipe/duct/conduit.4️⃣ Laying cable in tray/trough.5️⃣ Laying cable in concrete tunnel.Another way of protection is to lay
Cable lines (1 kV and above) are often laid in polymer pipes. In some countries, cable pipes are also referred to as ducts or conduits. These pipes/ducts/conduits allow to:✅Protect the cable from the mechanical damage.✅Protect the cable from the environment.✅Reduce the requirements for the quality of trench bottom preparation.✅Speed up cable pulling and its subsequent
If the outer sheath of the cable is damaged, water can penetrate into the cable, and this will lead to the defects in the XLPE insulation, followed by its breakdown (that is cable will get a short circuit). Therefore, it is important to monitor the condition of the outer sheath of the cable, preventing the
Cable lines are increasingly laid not in the open ground, but in pipes (ducts). This allows you to protect cables from mechanical influences and aggressive environment, ensure quick replacement of the cable with a new one, lay cables not only by the traditional method in trenches, but also by horizontal directional drilling HDD (this method
All over the world, more and more cable lines are laid not in the ground, but in ducts (conduits, pipes). Such ducts are made of various materials (PE, HDPE, PE-RT, PP, PVC), they can be single-layer or multi-layer. But all these ducts have one common problem – they have “infinite” impedance Rd of the side
Cable terminations are a weak element of the cable line, since:✅they have a complex structure;✅they are mounted manually (and the quality of installation depends on the qualification of the installer and his mood);✅they are subject to various external influences (sun, wind, rain, snow, ice etc). When a cable termination is damaged, it is not always
The photos show the exit point of the high voltage single-core cable from the ground near the cable ternination. Please note that the cable is placed in a black single-layer corrugated pipe. What’s wrong here? 1️⃣ Corrugated pipe is not a reliable mechanical protection for high-voltage cable. For example, pay attention to the deep cuts