Multifunctional cable identifier

Abstract

The invention relates to a multifunctional cable identifier, which comprises a shell. A circuit board is arranged in the shell; a test line and a power line are led out from the shell; the circuit board is provided with a main processor, a power conversion unit, a display unit, an extension unit, a carrier wave unit, a waveform generation unit, a coupling unit and an output unit; the coupling unitis connected with the output unit; the waveform generation unit is respectively connected with the main processor and the coupling unit; the carrier wave unit is respectively connected with the mainprocessor and the coupling unit; the power conversion unit is connected with the main processor; the display unit is connected with the main processor; and the extension unit is connected with the main processor. The multifunctional cable identifier in the invention can eliminate electromagnetic interference generated by the own circuit board; the interference of a common high-voltage common-ground common cable trench can be effectively overcome from an electromagnetic interference source and a propagation path; and the multifunctional cable identifier has the advantages of being simple in structure, accurate in judgment, convenient to use, high in recognition speed and the like.

Description

technical field [0001] The invention relates to a cable identification device, in particular to a multifunctional cable identification device. Background technique [0002] Before the electrical line is connected and during the debugging process, the identification method of the electrical cable core wire is usually two people using a multimeter or a test light at both ends of the line to connect the core wire and the reference line in parallel, and notify the other party through the intercom or mobile communication equipment , The operation is complicated, it is not easy to carry the multimeter and test lamp with you, the operation is easy to be in a hurry, and the efficiency of the calibration line is low. [0003] In low-voltage power supply lines, overhead lines and cables are generally used to supply power from the transformer station area to residents and residential buildings. In the actual operation of accessing the home line, most of the access lines are installed ...

AI Technical Summary

Problems solved by technology

The file management does not match the actual line, the station area definition of cable power supply users, and the problem of cross-station area not only affects the success rate of meter reading, but also causes wrong statistics for line loss calculation

In urban-rural fringe areas and cable communities with complex actual wiring, there is basically no effective means to distinguish between stations without interruption of power supply

According to the construction drawings, the real situation cannot be accurately reflected, and the existing communication technology cannot solve the problem of signal transmission across the station area. It can only be time-consuming and laborious to adopt the method of testing the circuit, which consumes a lot of manpower in communication and preliminary preparations. Cannot solve practical problems quickly and effectively

[0004] There are many devices for distinguishing electrical cables on the market, most of which are realized by low-voltage power line carrier technology, and the carrier frequency is above 100k. This kind of signal transmission has the problem of crossing phases and crossing stations.

As we all know, the attenuation of high-frequency signal transmission on the power line is very large, the communication distance is very short, and because there is a large interphase capacitance on the power line, it is easy to form a path for high-frequency signals, so it is impossible to ensure that the signal transmission does not cross phases in principle. ; At the same time, the parasitic capacitance of the transformer between the low voltage and high voltage can also cause the signal to pass through the transformer, and the signal communication can be successful under the transformer with a closer distance, which will seriously affect the accuracy of the test of the station area, and will cause the station area, phase Don’t be confused, the near test points of adjacent substations may also test wrong conclusions

[0005] The traditional electrical cable identification instrument adopts the power carrier communication method and the power frequency communication method, both of which have their own defects, and cannot accurately identify which bus branch or which phase the users in the station area are powered by

It mainly reflects the following problems or shortcomings: in the case of common high voltage, common ground and common cable trench, it will cause misjudgment

However, the transformers in general high-rise residential areas are all underground, wireless communication cannot be successful, and there is a distance problem in carrier communication, which affects the test conclusion

Since the host on the transformer side needs to be connected to both the voltage signal and the current signal, the volume of the host will be too large, it is not easy to carry, and it will increase the complexity of the equipment.

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