Author: Noyafa–POE checker
The cable routing instrument is mainly used to quickly locate the fault point of the cable, and it is suitable for the power supply department to quickly repair the power line. It has the characteristics of high speed, high precision, convenient and flexible use. It is very popular among most power workers, but about how it works, there is a cable routing instrument mainly used to quickly locate the fault point of the cable, suitable for the power supply department to quickly repair the power line.
It has the characteristics of high speed, high precision, convenient and flexible use. It is very popular among most power workers, but many friends are not very clear about its working principle. The following editor will introduce it to you in detail. The cable routing instrument is a high-tech product designed based on the reflection principle and electromagnetic induction principle of electromagnetic waves in the transmission process, combined with digital filtering, wireless reception and software control.
Electromagnetic induction: Its basic working principle is: the transmitter generates electric and magnetic waves and transmits the transmitted signal to the underground metal pipeline to be detected through different transmission connection methods. After the metal pipeline senses the electromagnetic wave, an induced current is generated on the surface of the cable. The induced current will travel far along the metal cable. During the propagation of the current, electromagnetic waves will be radiated to the ground through the cable, so that when the receiver of the underground metal pipeline tester detects on the ground, it will be detected on the ground. The ground directly above the underground metal pipeline receives the electromagnetic wave signal, and the position and direction of the underground metal pipeline can be judged by the change of the received signal strength. The working mode of the instrument transmitter: The transmitter has four working modes (direct connection method, clamp coupling method, induction method and loop resistance measurement). To ensure the reliable transmission of the signal on the target metal pipeline, there must be a reliable loop in the line. It can be an indirect loop composed of the ground, a capacitive loop composed of a distributed capacitance formed between a sufficiently long metal pipeline and the ground, or a direct loop composed of short-circuit fault points between lines.
The signal of the transmitter is directly applied to the target metal pipeline (power failure metal pipeline) with a direct connection line, that is, the direct connection method. The direct connection line is divided into red and black lines. The red line is connected to a certain line of the metal pipeline. The black line is the working ground wire of the instrument, which should be separately and reliably grounded. In order to ensure one-way reliable transmission of signals in the line, it is required to disconnect at least one end of the ground wire of the target metal pipeline, so that the signal can return through the ground in the form of an indirect loop or a capacitive loop.
Receiver working mode: When a signal is applied to the metal pipeline, there will be a current on the metal pipeline, and at the same time, the current will generate a magnetic field to radiate around the metal pipeline. The frequency of the magnetic field is consistent with the frequency of the applied signal. The strength is the metal pipeline as the center of the circle and the radiation is decreased, and the direction is the tangent direction of a certain point on the radiation circle. The receiver receives the magnetic field signal or the leaked electric field signal radiated by the metal pipeline through the internal antenna, and can be processed by five different frequency working modes, and the signal strength change is prompted to the operator.
The cable routing instrument is mainly composed of a signal transmitter and a receiver. Before using the instrument, electric power workers need to understand its main working principle, so as to better exert the function of the instrument, quickly find the fault point of the cable, and quickly Troubleshoot and ensure power supply. The above sharing of the relevant working principles of the cable routing instrument, I hope it can be helpful to all friends.
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