Grounding wire and cable breakpoint position detection circuit and method

Abstract

The grounding wire and cable breakpoint position detection circuit and method relate to the technical field of wire and cable detection. The grounding wire and cable breakpoint position detection circuit includes a metal test ring, an earphone, an audio signal generating circuit and an audio signal amplifying circuit, and the input of the audio signal amplifying circuit The terminal and the output terminal are respectively connected with the metal test ring and the earphone; the audio signal generating circuit is used to generate the audio oscillating signal and transmit the audio oscillating signal to the wire and cable; the metal test ring is used to pass through the AC magnetic field generated by the wire The relative movement of the cable generates an induction audio signal; the audio signal amplifying circuit is used to receive the induction audio signal and amplifies the induction audio signal and transmits it to the earphone; the earphone is used to monitor the amplified induction audio signal. The ground wire and cable breakpoint position detection circuit and method provided by the invention are simple in operation, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of wire and cable detection, in particular to a circuit and method for detecting a breakpoint position of a grounded wire and cable. Background technique [0002] In various production equipment and safety facilities, grounding is a very important technical means. It has a wide range of uses and can be basically divided into: working grounding, lightning protection grounding, protective grounding and instrument control grounding. In most cases, the grounding wire used for grounding is located outdoors. Due to temperature changes, wind and rain erosion, air oxidation and corrosion, etc., it is common for the grounding wire to be damaged, broken, and poor contact with the grounding body. The resistance value of the ground wire will not meet the corresponding national standards. The resistance value of the ground wire can be directly measured with a ground resistance tester. Chinese patent 201110222522.2 discl...

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Problems solved by technology

Although this method is simple to operate, it needs to use 220V mains power, which is not very safe, and for particularly thin wires, it is difficult to operate with the test lead of the multimeter along the wire.

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