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What are the methods to detect cable breakpoints?

Updated:23-10-2020
Summary:

1. Induction pen: First disconnect the power supply, re […]


1. Induction pen:
First disconnect the power supply, remove the power supply from the cables around the cable with the break point, then connect the cable with the break point to the live wire, and then use the induction electric pen to move slowly perpendicular to the cable. When the AC signal of the induction electric pen disappears, the disconnection can be judged The point is near the detection point, and it is being investigated slowly.
2.Digital multimeter:
First, connect one end of the cable with the breakpoint to the 220V live wire, and hang the other end in the air. Adjust the gear position of the multimeter to the AC 2V voltage gear. Then start from the live wire access end of the faulty cable, hold the black test lead firmly with one hand, and slide the red test lead slowly along the insulation layer of the faulty cable. The voltage value at the point where the cable has no break is about 0.445V. When the red test lead moves to a certain place, the voltage value displayed by the multimeter drops to 1/10 of the normal voltage, which is 0.04V. At this point, it can be basically concluded that the breakpoint is 15cm forward (the hot wire access end). If the shielding layer of the shielded wire is not damaged, then this method cannot be used.
3. Polyline:
For shorter cable test breakpoints, you can use the bending method to connect both ends of the cable to the red and black test leads of the multimeter. Bend back and forth from one end of the cable. If the multimeter is on and off at this time, then the break point is here. Follow this method to check until the breakpoint.
4. Acupuncture:
This method is to use the on-off of the cable to check the breakpoint of the cable. Insert the steel pin on the breakpoint cable segment, and then use a multimeter to measure the on-off status. The difference is where the breakpoint is. Jinhuanyu Cable reminds you that this method will destroy the insulation layer, and it is easy to cause other problems in the later use of the cable.
5. Audio detector:
For the judgment of the fault point of the underground cable, the fault point can be judged by the audio detector. This method requires professional instrument detection.
6. Cable fault telemeter
For the judgment of the cable length, short circuit and break point, you can use the cable fault telemeter to troubleshoot the fault point, which is also a professional tool.

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