Electric power industry consulting
One of the weak points of cable lines is cable joints and terminations. Despite all the efforts of specialists who develop and install the joints/terminations, there are still many damages. The consequences of damage will vary depending on the location features. There are at least the following typical locations:1️⃣ Joints in the ground.2️⃣ Joints in
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
Sometimes we have to lay our cable line (CL) along some other 6-750 kV existing lines (cable or overhead). In such cases, we have to think about the magnitude of the induced voltages on the core and screens of our CL. Such interference is caused by the magnetic field of currents passing in adjacent cable
When designing cable lines, it is very rare to find such projects where there is a section of documentation in which calculations of the magnitude of the magnetic field H of the cable line would be carried out. At the same time, the magnetic field H can pose a significant danger, primarily under the following
Earlier, I posted some photos showing that the surge arrester (SA), in case of its damage, can pose a danger to the equipment placed nearby. But what about consequences in case of damage of cable termination or cable joint? There are some examples of what we can get for 110 kV:1️⃣ cable termination mounted in
Power transmission lines usually are double-circuit. This allows you to maintain or repair a disconnected circuit while the second circuit remains in operation and provides power to consumers. For this kind of lines, questions usually arise with the safety of personnel, since the disconnected circuit is under the influence of a 50 Hz voltage induced
The photo shows a concrete underground well. It houses cable joints for 110 kV single-core cables. There are 6 joints for 6 single-core cables, which means that there is a three-phase double-circuit cable line. A fault (short-circuit) occurred in one of joints due to poor-quality installation, which led to an explosive increase in pressure in
Do you hear the operator breathing strangely? As if it’s hard for him to breathe? That’s right! That’s because he’s wearing a gas mask. Otherwise, he may die, because he went down into the cable collector, where there was a great fire the day before. As you can see from this video, a lot of
When using single-core 6-500 kV cables, various grounding schemes of screens are known. However, regardless of the scheme, it is recommended to connect cable screens to the ground at the ends of the line using special boxes. They are useful for personnel safety and convenience of testing the outer sheath of single-core cables. There are