Three Preventive Measures for Cable Leakage in Cable Fault Detection

It is very troublesome to solve the problem of the cable leakage, and the general cable fault tester is not equipped with the corresponding treatment equipment. In the specific operation, if a part of the cable joint end leaks, it can be applied again only by cutting off how many meters of the front-end development. If the reading of a cable has leaked, the foundation can not be used at this stage, so it can only be charged. Therefore, avoiding cable leakage is the appropriate choice, so as to take preventive measures. First, the cable joint shall be sealed. The sawn cable edges, whether stacked or laid, shall be sealed with plastic, and the special sealing sleeve for cable shall be selected to avoid the penetration of moisture and moisture. The fabrication of cable joints shall be carried out immediately after cable laying. Second, when purchasing cables, be sure to select manufacturers with solid quality. Because the residue and air outlet hole in the insulating layer are the starting point of water tree generation, the quality of cable is particularly important to avoid water tree embrittlement. Third, improve the management method of cable head production and processing technology. Once the cable leaks, the cable joint is usually the first to penetrate. Therefore, if the cable head is made well, it can increase the overall service life of the cable. For example, when the cable is separated from the semiconductor material layer, draw several vertically on the semiconductor material layer, and then peel off the semiconductor material like Gan Shu peeling. However, when cutting with a knife, if it is too deep, it will hurt the cable sheath and create opportunities for water supply and drainage trees. In addition, when the solder wire is used, because the switching power supply cannot be found, the gas furnace will be used to melt the solder wire immediately. At this time, the flame will destroy the copper shielding layer and cable sheath. Therefore, to avoid this kind of situation, UPS can be equipped. Since the time required for the solder wire is generally only 10min, the output power is 500W. PVC plastic PE corrugated pipe is selected, which has corrosion resistance, clean and bright inner cavity The compressive strength and ductility are excellent. Therefore, when the cable is buried and laid, the damage of the cable outer sheath can be greatly reduced. Design scheme of cable trench (pipe) and cable well. Due to the limitation of the standard, the cable laying adopts the method of buried or cable trench, and most of them are buried. If it belongs to the rainy area in the coastal area, there is water stored in the cable trench or cable well for a long time. Because the depth of the cable trench or cable well will exceed the depth of the sewer pipe, the drainage pipe is very difficult. Therefore, in the overall planning, harmony should be carried out, which is conducive to the drainage pipe of the cable trench (well). If it is impossible to ensure that there is no water in the cable well, the middle connector in the cable well shall be lifted with a support frame.

Three Preventive Measures for Cable Leakage in Cable Fault Detection 1

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Steps for Cable Fault Detection
The detection of cable fault generally goes through three steps: diagnosis, ranging and fixed point. 1. Cable fault nature diagnosis the diagnosis of cable fault nature, that is, to determine the type and severity of fault, so that testers can suit the remedy to the case and select appropriate cable fault location and fixed-point methods. 2. Cable fault location cable fault location, also known as rough measurement, uses instruments to determine the fault distance at one end of the cable. The common fault location methods at the test site include classical bridge method (high voltage bridge and low voltage bridge) and modern traveling wave method (pulse method: low voltage pulse method and high voltage pulse method). 3. Cable fault location cable fault location, also known as precise measurement, is to find out the general orientation of the fault point according to the fault location results and the path direction of the cable, and determine the accurate location of the fault point within a very small range by using the discharge acoustic measurement method or other methods. Generally speaking, successful cable fault detection must go through the above three steps, otherwise it will not be achieved if you want to speed up. For example, it is very difficult to detect the discharge sound at the fault point along a long cable path (possibly several kilometers long) without fault location. If the cable fault distance 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 10m) to detect the discharge sound at the cable fault point.
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