Determination of the exact site (location) of damage to a power electric cable, regardless of the method of its installation (air, underground in a mine), is carried out using special equipment using several methods. The most high-quality and effective method of burning the shell with a special device is considered, which allows you to accurately find the emergency area caused by a short circuit or mechanical damage to the insulation.
Such installations are called a high-voltage burn-through (HVP) stand, which, when connected to a power cable, creates phase-to-phase faults in its veins, as a result of which the resistance decreases in the place where the defect is present. The device belongs to expensive and specific equipment, therefore prevention and current Overhaul of the hovercraft must be carried out in specialized repair centers that provide guarantees for all work performed.
Types of SVP installations
With the help of cable burn-through installations, it is possible to identify and determine damage not only in a section of a long electric line, but also to detect defects on couplings and limit switches of transitions. The domestic industry produces SVP devices of the following types:
- A device that can be used both for testing the commissioned cable and for burning it.
- A device with an operating range for burning 20-25 KV.
- Afterburners completely destroy the contact (bridge) between the cores, resulting from a short circuit.
The equipment has certain prerequisites for use. When making a choice in favor of using a certain SVP apparatus, it is necessary to take into account the recommendations for its use from the manufacturer. Devices of various modifications have significant technical differences and service methods. Only qualified specialists under the guidance of engineering and technical personnel who have undergone appropriate training and are familiar with the safety rules should be allowed to work on them.
