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–Noyafa Cable Tester
The difference between the power cable fault bridge method and the low-voltage pulse method Power cable fault cable fault intelligent tester: cable fault tester, fixed point tester, path tester, cable fault pathfinder, cable fault flash tester, cable fault fixed point tester, cable circuit The difference between the power cable fault bridge method and the low-voltage pulse method Power cable fault cable fault intelligent tester: cable fault instrument, fixed point instrument, path instrument, cable fault path finder, cable fault flash tester, cable fault fixed point instrument, cable path Instrument Shenzhen Noyafa will answer the difference between the power cable fault bridge method and the low-voltage pulse method: 1. The bridge method mainly includes the traditional DC bridge method, the voltage drop comparison method and the DC resistance method. It measures the line resistance of the faulty cable from the measurement end to the fault point, and then calculates the fault distance according to the resistivity; a method of distance. It is generally used to test the distance of cable faults with insulation resistance within a few hundred thousand ohms at the fault point.
2. The low-voltage pulse method, also known as the radar method, is to input a low-voltage pulse signal into the cable through the instrument at one end of the cable. When encountering a fault point where the wave impedance does not match, the pulse signal will be reflected and returned to the measuring instrument. The fault distance can be tested by detecting the time difference between the reflected signal and the transmitted signal. This method has the advantages of simple operation and high test accuracy. It is mainly used to test disconnection and low-resistance faults (insulation resistance is less than a few hundred ohms), but it cannot test high-resistance faults and flashover faults. There are many failures.
Shenzhen Noyafa is a company specializing in the production of electric power testing equipment. It is a manufacturer of cable fault testers. The company has won unanimous praise from the market and customers with its good credit and high-quality products.
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