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–CCTV Tester
Jiangxi cable fault detection zero potential test method detailed explanation Jiangxi cable fault detection zero potential test method detailed, Shenzhen Noyafa Cable Fault Detection Co., Ltd. is a Jiangxi cable fault detection zero potential specializing in cable fault detection, emergency repair, route search, and fault location services Detailed explanation of test methods Detailed explanation of zero-potential test methods of Jiangxi cable fault detection The zero-potential method is also the potential comparison method for finding, cable fault location, high-voltage cable fault detection, etc. It is suitable for the ground fault of the cable core with a short length. The measurement of this method is simple and accurate, and does not require precise instruments and complex calculations. The wiring is shown in Figure 5. The measurement principle is as follows: connect the faulty core wire of the cable in parallel with the comparison wire of equal length, and when voltage E is applied at both ends, it is equivalent to connecting the power supply at both ends of the two parallel uniform resistance wires. When , the potential difference between any point on one resistance wire and the corresponding point on the other resistance wire must be zero. Conversely, two points whose potential difference is zero must be corresponding points. Because the negative pole of the microvoltmeter is grounded and has the same potential as the fault point of the cable, when the positive pole of the microvoltmeter moves on the comparison wire to the point where the indicated value is zero, the point is equipotential with the fault point, that is, the corresponding point of the fault point.
The measurement steps are as follows: ① First, connect the battery E to the core wires of the b and c phases, and then lay a comparison wire S with the same length as the faulty cable on the ground. The wire should be bare copper wire or bare aluminum wire. should be equal, without intermediate joints. ②Connect the negative electrode of the microvoltmeter to the ground, and the positive electrode to a long flexible wire. The other end of the wire should be in full contact when sliding on the laid comparative wire. ③Close the knife switch K, slide the end of the flexible wire on the comparison wire, and the position when the microvoltmeter indicates zero is the position of the cable fault point.
The above four practical cable fault point detection methods, although the steps are a bit complicated, they are really practical. I hope you can read it carefully and feel the skills inside.
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