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
After the buried cable is faulty, it is generally necessary to initially judge the fault properties. Then, according to the type of fault, the fault point is used, and the fault point is initially positioned; finally, along the buried cable, carefully detect the fixed point before and after this location, after the buried cable is faulty, generally must first prestimate the fault properties judge. Then, according to the type of fault, use the appropriate ranging method to perform preliminary positioning; repair.
Today, let's take a look at the problem of rural buried cable faults. I. Analysis of the analysis of the rural buried cable faults, generally to understand the problematic correlation, and then perform comprehensive analysis, find out the cause of the fault, and then look into the exclusion. For example, find an informed parties such as construction personnel, wire users, and other relevant personnel, detailed understanding, often eliminating the failure in the shortest time in the shortest time.
The advantage of analyzing judgment is simple and easy, does not require complex instruments, and can be eliminated in time to some faults. Therefore, it is difficult to quickly exclude this method. For the buried line of the burying line, in the case of the instrument, it is difficult to find a fault, sometimes do more than ten days, and it is difficult to find the fault point for ten days, and sometimes to the same ditch Damage in other wires, a new fault occurs.
This method is generally not used alone, but is used in conjunction with other instrument detection methods. The buried wires have failed due to the following reasons: 1, external force damage: is the main reason for the failure. For example, the construction, water pipe, building aqua, planting trees, buildings, etc.
2, attachment failure: Due to the irregularity of the joint process in the construction, mechanical damage is easy to cause the joint. Alternatively, there is a problem between the contact resistance and the income of the contact. After the wire belt load is running for a while, the hidden danger is often caused by a disconnection or ground failure.
, 3, laid irregularity: When the buried line is laid, there must be strict process requirements. However, due to the large amount of construction of farm net transformation, the personnel are in short supply, some areas are in the construction of the ground, and there is often such or such irregular construction behaviors. For example, there is no fine yarn when the surface is backfilled, and the floral block containing gravel is directly filling, which is extremely easily caused by the damage insulating layer.
Second, using a simple ground fault detector test fault currently commercially available brand ground fault tester, its working principle and test methods are similar. The working principle is to apply a fixed voltage signal to the ground wire. The electric field is formed around the ground to form an electric field, the closer to the fault point, the greater the difference between the same distance, and vice versa. Based on this principle, you can find a grounding failure point.
This type of test instrument market is priced for a few hundred yuan - a few thousand dollars, and the embedding failure of the docking ground resistance can meet the test purpose. The rural buried cable fault finding method introduces you here, I hope that the employees can be used in the work.
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