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–Cable Tester Manufacturer
Question: How can I view the entire cable fault detection technology? Answer: From the perspective of the entire cable fault detection technology, the precise location of the fault point is the main contradiction in the current cable fault detection technology, and it is also a problem in the current cable fault detection technology: How to check the entire cable fault detection technology? Answer: From the perspective of the entire cable fault detection technology, the precise location of the fault point is the main contradiction in the current cable fault detection technology, and it is also a major problem in the current cable fault detection technology. The traditional method of cable fault location is the stick-point method. The method is simple and feasible, especially when the discharge sound is large, the effect is ideal.
However, when the DC resistance of the fault point is very small, the discharge sound is not too loud, and it is often ineffective to locate the fault point with a stick. To this end, many professional and technical personnel have been working to find a more ideal method. Some units have proposed that the vibration wave generated by the flashover at the fault point should no longer be heard by the wooden stick.
A new probe and positioner converts weak mechanical vibration waves into electrical signals. The amplifier circuit of the locator fully amplifies the electrical signal, and then restores the electrical signal to sound through the earphone, and then accurately determines the exact location of the fault point through the organic cooperation of man-machine. It is also slightly different, and the different properties of cable faults are analyzed and discussed below. Test methods and precautions for precise location of low-resistance faults in high-voltage cables and rough measurement of low-resistance faults by low-voltage pulse method.
Wiring as shown in Figure 1, locate the fault within the rough measurement range. Since the resistance of this fault is very small, the discharge gap at the fault point is also very small. When the applied impulse voltage is not very high, flashover discharge occurs at the fault point.
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