What should I do after the service as a cable person?
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During the after-sales service of cable products, we often encounter such users. After they have purchased cable products, they often have improper construction or use, resulting in an early power failure after the cable is used. As some users do not have the ability to detect on-site cable faults, cable manufacturers are often required to assist in on-site fault location and cause analysis services. The service personnel who have conducted cable fault location on the site all have this experience. They must ensure the service quality in the field of cable fault investigation. As a cable after-sale service personnel, they need to make preparations for the following three aspects.
1. Actively and comprehensively communicate effectively with users, fully understand the actual situation of on-site failures, and prepare various types of inspection equipment before departure. Take a digital camera if necessary. Laptops and U disk and so on.
Because the professional cable fault detection equipment currently purchased from the market is divided into high voltage and low voltage parts, the equipment required for carrying out different types of cable faults at the site may be different. If you do not fully understand the situation on the site before departure, the missing or insufficient equipment will greatly delay the on-site repair time of cable faults, and cause greater economic losses to users. This situation may have little effect on short-distance services, but for long-distance remote fault location technology services, the delay may be considerable. Greatly affected the actual service effect of the cable.
2. Have sufficient ideological understanding and preparation for the harsh environment of the cable fault site.
The occasions where the cables are used are relatively variable and they may be used in oilfields in deserts where people are deserted. It may also be used underground in coal mines, and it may be possible to use newly established chemical plants and cement plants on the Grand Gobi. The vast majority of cables are located outdoors, and cables are mostly laid by direct burial, bridges, and cable trench tunnels. Due to the large temperature difference between day and night in the desert and Gobi Desert, the on-site precision determination process for the location of outdoor cable buried faults may be during the day. At this time, the surface temperature may reach about 40°C above zero, and it may occur at night. Back down to minus 15 degrees Celsius.
When the cable fault point is accurately measured, the detection process is usually completed within 1-2 hours, but when the fault is special and the actual experience of the tester on site is lacking, it often takes tens of hours or even several days. In the case of continuous fault location in such a climate environment, service personnel must have a full understanding of the site's climate and environmental conditions in advance. Get ready for all kinds of warm clothing and heatstroke preparation on site. Prevent physical injury during on-site service and affect on-site service efficiency.
The bridges used for laying cables often have a height of more than ten meters. If the point of failure is on the upper cable tray. Service personnel are often required to wear safety belts on bridges to assist users in conducting high altitude patrols. Such services are often dangerous. Therefore, safety protection must be done before the bridge and safety belts should be worn to prevent accidental injury at height. The above examples are just some of the on-site situations we have learned. The actual situation on the site may be more complicated and changeable than what we have learned. The on-site location and processing time of general cable faults are quite tight. At the same time, the service personnel will usually start rushing after receiving the notice. This requires us to arrange the time and schedule reasonably in the actual service process, and eliminate the line fault for the user in time. Winning customer satisfaction.
On-site cable faults often occur suddenly and may occur at night or during holidays. Moreover, the arrival time of the service personnel on the site is also random, and the on-site positioning and repair service process may be performed during the day or night. Therefore, field service personnel must have hard-working dedication, good physical quality, and rich experience in field fault location. At the same time, high-precision cable fault detection equipment has become a must for on-site service work. The high-quality on-site cable fault location service not only wins valuable repair time for the user, but also reduces the economic loss of the user. And it has won users and markets for cable manufacturers.
3. Has excellent cable fault detection experience and a wealth of cable fault analysis capabilities
The actual performance of field faults on the cable lines varies, and the actual situation of cable faults encountered by service personnel at each time will be different. Some faults occur at the cable terminators, intermediate connectors; some cable insulation only has one fault point after breakdown, and some cable insulation may have two or more fault points after breakdown; some cables are burned out after a full failure. Scrap can't be used.
For different types of cable faults, we must first confirm the fault nature of the cable and adopt appropriate fault detection methods. The exact location of the cable fault can be found. The fault type of the cable is roughly divided into high impedance, low resistance and open circuit fault according to the insulation characteristic impedance and the line conductor's on-off status. The detection methods selected for different fault natures are generally divided into bridge method, low-voltage pulse method, and impulse. Flash method, secondary pulse method, three-pulse method, etc. The above method can only complete the rough measurement of the cable fault location and determine the approximate location of the cable fault point. To achieve the fine point of failure, it is necessary to assist in the use of sound and audio methods and step voltage method. Although there are a large number of various types of cable fault detectors on the market at present, due to the special nature of the cable manufacturing industry, the speed of development and renewal of cable fault detectors lags behind the development speed of cable materials and cable products.
In addition, the types of buried cable faults, and the complexity and multi-deformation of the terrain at the site, lead us to fail to achieve precise positioning for certain special types of faults during the actual fault detection process. In this case, it is often necessary to use two or more positioning methods to compare with each other to determine the exact location of the cable fault point. The causes of cable faults are various. There are mechanical damage faults, overload faults, cable selection, improper use of laying methods, and so on. As field service personnel, only with excellent cable fault location and fault analysis and judgment capabilities, field experience in cable line testing and the actual experience and skills in the installation of accessories can quickly and effectively help users eliminate line faults in a timely manner and truly satisfy customer satisfaction.