Guide to Buy Principle of Cable Fault Tester in NOYAFA

Guide to Buy Principle of Cable Fault Tester in NOYAFA

2021-11-06
NOYAFA
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The Principle of cable fault tester is a hot seller of SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED. This is a result of 1) Excellent design. A team of professionals is gathered to detail each step to craft it and to make it economical and practical; 2) Great performance. It is quality assured from the source based on strictly selected raw materials, which is also a guarantee of its long-term use with no defects. Certainly, it will be design updated and usage completed so as to meet the future market demands. To successfully built a global brand image of NOYAFA, we are dedicated to immersing our customers in the brand experience in every interaction we engage with them. We continue to inject new ideas and innovations into our brands to meet the high expectations from the market.Customization for Principle of cable fault tester and fast delivery are available at Best Cable Tester Supplier in China _ Noyafa. Besides, the company is dedicated to providing timely product delivery.
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Principle of Cable Fault Tester
Principle of Cable Fault Tester
At present, the cable fault tester based on impulse flashover method used by the majority of users of power cable fault tester can easily roughly measure the distance of fault point with rangefinder when solving low resistance fault and dead ground fault of low-voltage cable (the distance test of such fault point does not need high-voltage discharge equipment, but uses low-voltage pulse method), However, the method of lighting fire, discharging and listening to sound is still used to locate the fault point. At the same time, the Pathfinder and fixed-point instrument of this kind of instrument are separated, which makes it impossible to synchronize the fixed-point when finding the path, and the fixed-point often deviates from the path. Moreover, due to the limitations of the principle, it is difficult to find the accurate path of the cable when finding the cable path, It is generally between 1-2 meters wide. Starting from practicability, hn-a10 series cable fault locator just makes up for the above defects. It can test the fault point location, buried depth and path synchronization of cable. The indication of fault, path and buried depth of the instrument is very intuitive, without technical analysis and completely independent of the operator's experience. It makes the originally tedious fault test work become a relaxed and interesting thing. Therefore, if the majority of impulse lightning cable tester users have another ht-tc cable fault locator and the original distance finder, they can form a set of perfect low-voltage cable fault tester. At the same time, the low resistance and open circuit faults of high-voltage cables can also be quickly fixed, and the work efficiency can be improved several times. In fact, the majority of power consuming enterprises and units rarely contact the maintenance of high-voltage cables in daily production, because the maintenance right of high-voltage cables is generally specially maintained by the prefecture and municipal power departments. The number of low-voltage cables is far greater than that of high-voltage cables. For enterprises, factories and mining units, residential areas, scientific research institutes, more developed towns and villages, colleges and universities, some small and medium-sized cities and county-level power supply bureaus, the solution of low-voltage cable faults is what they are most concerned about. In fact, what low-voltage cable users need is a tool tester with simple operation, convenient carrying, strong practicability, low price and suitable for field operation. Because the insulation strength of low-voltage cable is low, if the method of ignition and discharge is used to test the fault of low-voltage cable, we find that this method sometimes causes secondary fault. More seriously, after ignition and discharge, the service life of the cable will be reduced and the fault incidence will be increased, which will seriously affect the normal power supply and production.
Working Principle of Cable Fault Tester
Working Principle of Cable Fault Tester
Working principle of power cable fault tester consists of three main parts: power cable fault tester host, cable fault locator and cable path tester. The host of the cable fault tester is used to measure the nature and total length of the cable fault and the approximate position between the cable fault point and the test end. The cable fault locator determines the exact location of the cable fault point based on the approximate location of the cable fault point determined by the host of the cable fault tester. For buried cables with unknown direction, a pathfinder shall be used to determine the underground direction of the cable. The basic method of power cable fault test is to apply high-voltage pulse to the fault power cable to produce breakdown at the cable fault point. When the cable fault breakdown point discharges, it generates electromagnetic wave and sound at the same time. The working principle of the application of arc reflection method (secondary pulse method) in cable fault location: firstly, a high voltage pulse with a certain voltage level and energy is applied to the faulty cable at the test end of the cable to make the high resistance fault point of the cable break down and burn arc. At the same time, add the low-voltage pulse for measurement at the test end. When the measurement pulse reaches the high resistance fault point of the cable, it encounters an arc and reflects on the surface of the arc. When arcing, the high resistance fault becomes an instantaneous short-circuit fault, and the low-voltage measurement pulse will change obviously in impedance characteristics, so that the waveform of flashover measurement becomes a low-voltage pulse short-circuit waveform, making the waveform discrimination particularly simple and clear. This is what we call the "secondary pulse method". The received low-voltage pulse reflection waveform is equivalent to the waveform of a wire core completely short circuited to ground. Superimpose the low-voltage pulse waveform obtained when releasing the high-voltage pulse and when not releasing the high-voltage pulse. The two waveforms will have a divergence point, which is the reflected waveform point of the fault point. This method combines low-voltage pulse method with high-voltage flashover technology, which makes it easier for testers to judge the location of fault point. Compared with the traditional test methods, the advantage of the secondary pulse method is to simplify the complex waveform in the impulse high-voltage flashover method into the simplest low-voltage pulse short-circuit fault waveform, so the interpretation is very simple and the fault distance can be accurately calibrated. The triple pulse method adopts the double impact method to prolong the arc burning time and stabilize the arc, which can easily locate the high resistance fault and flashover fault. The triple pulse method has advanced technology, simple operation, clear waveform and fast and accurate positioning. At present, it has become the mainstream positioning method of high resistance fault and flashover fault. The third pulse method is an upgrade of the second pulse method. The method is to first measure the reflected waveform of the low-voltage pulse without breaking through the fault point of the measured cable, then impact the fault point of the cable with the high-voltage pulse to generate an arc, trigger the medium voltage pulse when the arc voltage drops to a certain value to stabilize and prolong the arc time, and then send the low-voltage pulse, Thus, the reflected waveform of the fault point is obtained. After the superposition of the two waveforms, it can also be found that the divergence point is the corresponding position of the fault point. Because the medium voltage pulse is used to stabilize and prolong the arc time, it is easier to obtain the fault point waveform than the secondary pulse method. Compared with the secondary pulse method, the triple pulse method does not need to select the synchronization time of arc burning, and the operation is also more simple.    
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