Author: Noyafa–CCTV Tester
The steps of cable fault detection Cable fault detection generally goes through four steps: preparation work, fault nature diagnosis, distance measurement, and fixed point. 1. Preparations Before the test, it is necessary to know the voltage level of the cable to select the appropriate high-voltage pulse voltage. The steps of cable fault detection are also detailed. The detection of cable faults generally needs to go through four steps: preparation work, fault nature diagnosis, distance measurement, and fixed point.
1. Before the work test, understand the voltage level of the cable to select the appropriate high-voltage pulse voltage. Also learn more about the length of the cable, insulation material, laying method, path, number of connectors, connector location and other information. When the path is unknown, use a path meter to determine the cable path.
In short, the more complete the data of the cable, the shorter the test time. 2. Diagnosis of fault nature (classified by test method) Diagnosis of the nature of cable fault, that is, to determine the type and severity of the fault, so that the tester can prescribe the right medicine and choose the appropriate cable fault distance and fixed point method. 3. Fault location Cable fault location, also known as pre-positioning, uses an instrument at one end of the cable to determine the fault distance. The commonly used fault location methods in the field include the classical bridge method and the modern traveling wave method (see§1-6).
4. Cable fault fixed point Cable fault fixed point, also known as precise positioning, that is, according to the fault location results, according to the path direction of the cable, find the general orientation of the fault point, in a small range, use the discharge acoustic measurement method or Other methods determine the exact location of the fault point. In general, successful cable fault detection must go through the above four steps, otherwise the haste is not enough. For example, it is very difficult to detect the discharge sound at the fault point along a long cable path (may be several kilometers long) by using the discharge sound measurement method without fault location.
If the distance of the cable fault is known, and a general orientation is determined, it is much easier to move the fixed-point instrument back and forth within a small range (about 10 meters) to detect the discharge sound at the fault point of the cable.
Copyright © 2022 SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED - www.noyafa.net All Rights Reserved.