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–Noyafa Cable Tester
Shenzhen Noyafa, a professional cable fault tester manufacturer in Henan Tester manufacturer Shenzhen Noyafa Guide: Henan professional cable fault tester, Shenzhen Noyafa is a manufacturer of cable fault testers, professional electrical measurement, product selection is rich, if you are looking for a cable fault tester, choose Shenzhen Noyafa. Shenzhen Noyafa|Henan Professional Cable Fault Tester Professional cable fault tester is a comprehensive set of cable fault detection instruments. Test for faults such as poor contact. The professional cable fault tester is equipped with an acoustic measuring point instrument, which can be used to accurately determine the precise location of the fault point.
It is especially suitable for testing power cables and communication cables of various types and voltage levels. point of failure test. The single-phase low-resistance grounding fault of the cable means that the insulation resistance of one core wire of the cable to the ground is lower than 100k.Ω, and the core wire has good continuity.
Such faults have strong concealment, and we can use the principle of loop fixed-point method to test. The wiring diagram is shown in the figure. The faulty core wire and another intact core wire form a measurement loop, measure with an electric bridge, one end is connected with a jumper wire, and the other end is connected with a power supply, an electric bridge or a galvanometer, and the bridge resistance is adjusted to balance the electric bridge. When the wire material and section are the same, it can be calculated according to the following formula. If the damaged wire core and the good core wire are exchanged with each other on the bridge, the——The distance from the measuring end to the fault point, m; L——Total cable length, m; R1, R2——Resistor arm of the bridge.
Under normal circumstances, the measurement results of these two wirings should be the same, and the error is generally 0.1% to 0.2%. If it exceeds this range or X>L/2, the measuring instrument can be moved to the other end of the line to measure. In addition, we can also use the continuous sweep pulse oscilloscope method (MST—Type 1A or LGS—Type 1 digital tester) for testing. The reflected wave at the short-circuit or ground fault point will be negative reflection, at this time, the fault point distance can be calculated according to the following formula X——reflection timeμs; V——Wave speed, m/μs.
Henan professional cable fault tester, Shenzhen Noyafa is a manufacturer of cable fault tester, professional electrical measurement, product selection is rich, looking for a cable fault tester, choose Shenzhen Noyafa.
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