Due to cable failure caused by cable laying, the location of the cable fault is different from the method of cable laying, and the position is gradually increased. Among them, the bridge, tunnel, and trenches are relatively simple, and it is difficult to position in direct burial. When the fault is simple, the cable fault is different from the cable fault due to the cable layout, and the position is gradually increased due to the mode of cable laying.
Among them, the bridge, tunnel, and trenches are relatively simple, and it is difficult to position in direct burial. When the fault is simple, a dedicated cable fault lookup apparatus is used to locate the equipment for 4-5 days or even longer in dozens of minutes. When the cable fault is positioned by the echo method, it is sometimes transferred by transfer failure, the wiring mode, often converts the complex failure into 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 found that using cable fault finders We have found that low voltage cable faults are used to use 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 way to use the cable fault finder will introduce it to you. Do you know? Pay attention to Xiaobian, more exciting knowledge is waiting for everyone! .
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