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
About Underground Pipeline Detectors, Xiaobian has been briefly introduced to you in the previous article. Today, I will introduce you to the use of underground line detectors, as well as some other related knowledge about underground line detectors, Xiaobian has already introduced it to you in the previous article, here is not one Further details. Today, I will introduce you to the use of underground pipeline detectors, as well as some other related knowledge.
If you want to learn this knowledge, don't miss this article! The underground line detector is the principle of electromagnetic induction to detect the precise direction and depth of the underground metal pipe and the cable and the line out of the pipeline. Strong, rig, arrow and sound prompt via large screen liquid crystal display, make the operator easily determine the cable underground position and fault point. Underground pipeline detectors can be used to find cables (charged or non-charge) paths, and can be used to find a direct buried cable fault.
The underground pipeline detector changes the concept of traditional cable fault positioning, no high pressure testing device, does not need to use AC power supply, no need to analyze waveforms. Underground pipeline detector electromagnetic method test method: 1 It is very convenient and it is very accurate. 2, the connection: use the straight-up method to insert the signal line plug into the transmitter socket.
Clip the red signal line on the cable fault phase. The black signal line is as close as possible to the cable and a 90 degree angle in the direction of the cable, and is connected to the ground rod. 3, use the pipeline detector“Wong Feng method”Long-distance tracking is used to determine the pipeline direction, and determine the signal sharply or disappear (arsenic point) to determine the abnormal area.
According to the actual work experience, the accurate position of the fault is around 1 meter or so of the signal suddenly disappears (the depth of the embedded depth). There are several short-circuit pickings, there will be several walking points, in general, the short-circuit pick-up signal from the transmitter is most obvious, and should first solve the farthest or most obvious signal change point, solve After re-test, then you will find that the remaining fault point signal change is much more significant than the original test, repeat the above process, solve each failure 4, underground pipeline detector step voltage method test: Step voltage method is our actual The most effective method in the application, its detection principle is: Provide a high voltage current by the transmitter, and the current is entered from the cable fault point, generating a step voltage around the fault point, through“A”The two electrodes of the frame are measured along the cable path to measure the potential. When approaching the fault point, the potential difference will increase rapidly, and the maximum value is reached before the point of failure.
If you meet a multi-point failure, you can measure multiple points along the cable path.“Polar change point”, Find a multi-point electric mutation again, respectively“zero”Potential. The fault positioning is actually determined the insulation damage of the underground pipeline. When a certain signal is applied to the pipeline, a part of the signal is returned by the outer skin breakage point.
The above is the method of use of the underground line detector, the space is limited, and today only brief introduction. Everyone can pay attention to Xiaobian, which will bring you more exciting content.
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