NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Locator Suppliers
How does the insulation fault locator quickly locate cable faults? Cable fault location tips Insulation fault locator The location of cable faults varies with the cable laying method, and its location difficulty is gradually increasing. Among them, the location and search of bridges, tunnels, and trenches are relatively simple, and the direct burial method is the most difficult. When the nature of the fault is simple, a dedicated cable fault locating device can be used to locate the fault within tens of minutes. When the fault is special, it often takes 4-5 days or even longer to locate the fault.
How to quickly locate cable faults? Shenzhen Noyafa is here to teach you some tips. When using the echo method to locate cable faults, sometimes complex faults are transformed into simple faults by transferring the faulty phase and wiring method, and the fault location can be quickly determined to gain time for on-site line repairs, which is very important for power supply departments. Significant. Low-voltage power cables are generally multi-core cables. After being laid, there are usually two-core and multi-core phase-to-phase or phase-to-ground short-circuit faults after continuous use.
Sometimes when it is detected that the fault waveform collected by a certain core is not ideal, it can be considered to switch the wiring to other faulty cores for fault waveform detection, and unexpected effects often occur. The collected and detected waveforms will become By comparing typical and rules, the specific location of the cable fault point can be quickly determined. During the long-term on-site measurement of cable customers, it was found that after the failure of small-section copper-core direct-buried power cables (35mm2 and below) and aluminum-core cables, short-circuit and disconnection faults may be accompanied at the same time. The difference between the short-circuit fault and the disconnection fault measurement is often done with less effort. For medium-voltage direct-buried power cables whose inner lining is extruded and armored, most of the faults are caused by external mechanical damage. When the insulation core fails, the inner lining may have been damaged.
When encountering a special cable insulation fault, it is difficult to use a professional cable fault instrument to collect waveforms. Consider using the acoustic method to apply high-voltage pulses directly between the steel tape and the copper shield of the cable, which tends to settle quickly. In the field measurement process, we also found that when using the acoustic measurement method to locate the fault of the low-voltage cable, when the high-voltage wire and the ground wire are connected between the bad phase and the metal shield or armor, the insulation resistance of the two presents a low-resistance metallic connection. status, the sound is very small, the probe cannot be used to monitor the fixed point, and the effect is not ideal.
Through the actual listening to the side for many times, it is found that the distance between the discharge ball gaps is appropriately increased, and at the same time, the high voltage and grounding wires are reconnected between the two phases where the fault occurs, and the discharge sound will often become louder, and the fault point will be quickly determined . How to quickly locate cable faults? Cable Fault Location Tips Insulation Fault Locator Shenzhen Noyafa Electronic Technology Co., Ltd.
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