Cable faults will also occur during the cable laying process. Due to the different ways of cable laying, the difficulty of cable fault positioning has gradually increased, with the positioning positioning positioning of the bridge, tunnel, trench, and the positioning positioning positioning positioning positioning. The cable fault will also occur during the wireless cable laying process. Due to the different ways of cable laying, the difficulty of cable fault is gradually increased, in which the positioning positioning of the bridge, tunnel, trench, etc. is relatively simple, and the total buried positioning positioning positioning is compared Difficulties, generally adopt a dedicated cable fault location device (also known as cable fault tester), can be positioned in dozens, when special failures, often take 4-5 days, or even longer time can be positioned. Let's analyze the power cable fault location. When the power cable fault is positioned by the echo method, it is sometimes transferred by transfer failure, and the wiring mode is often converted to a simple fault, quickly determines the fault location.
Win time for the repair of the on-site line, this is a significant significance for the supply department. The low voltage power cable is generally a multi-core cable. After the continuous use of continuous use, it is generally presented that two cores and multi-core comparable or relative ground failures, sometimes when the fault waveform collected by a certain core is not ideal, Consider converting the wiring to other fault lines for faulty waveform detection, often occurs unexpected effects, acquisition, and detected waveforms, it will become more typical and rules, so you can quickly determine the specific location of cable fault points. . Long-term cable customer field measurements found that small cross-section copper core buried power cables (35mm2 and below) and aluminum core cables may be accompanied by short circuit and disconnection failure.
At the time of field detection, the short-circuit failure is converted into a disconnection fault measurement according to the different fault characteristics of the failure of each fault. For the inner liner, the medium-pressure direct buried power cable is used, which is mostly caused by external mechanical damage. While the insulating line is faulty, the inner liner may have been damaged, and the comparison of cable insulation faults Special, when using professional cable fault tester to collect waveforms, it is considered that the high pressure pulse is directly applied to the steel strip of the cable and the copper shielding layer of the cable, and it will often be unpredictable. We have also found that low voltage cable faults are used in low-voltage cable failure when using sound test.
When the high voltage line and the ground are connected between the bad phase and the metal shield or armor, since the insulation resistance exhibits a low-resistance metal connection state, the sound is small, and the probe cannot be used to listen to the fixed point. The effect is not ideal, through more On the actual listening side of the second field, it is found that the distance between the discharge spheroid is increased. At the same time, the high pressure and ground wires are changed between the two-phase of the fault, and often the discharge sound will become large, and the fault point is quickly determined. The above is the relevant knowledge of power cable fault location, hoping to bring some help to people need.
Copyright © 2022 SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED - www.noyafa.net All Rights Reserved.