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
Four methods of judging the fault point of the power cable. When the cable or the middle of the cable has a balance point fault, it is difficult to visually see the white point due to the installation of the external insulation. specified location. 1. The method of digital multimeter method without damage to the wire: First, connect one side of the wire with the segment point to the 220V live wire, and make the other end hollow. Adjust the gear of the multimeter to the AC 2V voltage gear.
The next scene starts from the swarms of former enemies of the faulty cable, holding a black test lead in one hand, and the red test lead slowly sliding along the insulation layer of the faulty cable. The voltage value at the unbroken point of the cable is about 0.445V. When the red test lead moves somewhere, the voltage value displayed by the multimeter plummets to 1/10 of the normal voltage, that is, 0.04V.
At this time, the breakpoint can basically be determined to be 15cm in front of the post (the end of the fire line in groups). 2. The method of induction tag electric pen first removes the wires around the breakpoint wire and has power supply, and then connects the cable with the breakpoint to the live wire, the next field uses induction purple hair to move slowly perpendicular to the wire, when the AC signal of the induction row pen When it converges, it can be judged that the breakpoint is at the detection point, and the error is at most not exceeding 10cm. 3. The broken line method can not use the bending method to test the breakpoint of this short wire, and connect the two wires to the two sides of the red and black test pens of the multimeter respectively.
From one side of the wire, the curtain is bent and if the multimeter is on and off at this time, then the breaking point is here. Follow this method until the breakpoint is reached. 4. Acupuncture identification method This method is to use the on-off of the cable to check the breakpoint of the wire.
Divide the breakpoint wire and insert the steel needle upside down, and then use a multimeter to measure the on-off phenomenon in turn. The difference is the breakpoint everywhere. However, this method will destroy the insulating layer, and it is easy to induce other problems in the later cable service.
Four judgment methods of power cable fault point
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