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–Cable Length Tester
The role of the cable identification instrument in the field of cable maintenance is estimated to be unnecessary for the editor, as everyone knows it well. Today, the pen and ink of the editor's article will focus on introducing the principle of the cable identification instrument. I believe that through the accumulation of this knowledge, you will have a cable identification instrument. The role of the cable identification instrument in the field of cable maintenance is estimated to be unnecessary. know. Today, the pen and ink of the editor's article will focus on introducing the principle of the cable identification instrument. I believe that through the accumulation of this knowledge, you will have a clearer understanding of the cable identification instrument.
If you are interested in this area of knowledge, read on. The cable identification instrument consists of three parts: a signal generator, a receiving identification clamp and an indicator meter. When the receiving identification clamp signal detector is used, the signals detected on other cables are much smaller and in opposite directions. The amplitude and direction are indicated by the electric meter. It is easy to determine the cable under test. It is used to identify a specific cable to be found in a bundle of cables in the erection, migration, maintenance and troubleshooting of power cables; it has the ability to identify cables accurately (dual judgment of direction and amplitude), fast, simple operation, wide application, etc. Features.
The live cable identification instrument is a new type of instrument with advanced technology and superior performance among similar instruments in China. In order to identify the cable reliably and accurately, it is necessary to add a special signal to the identified cable. The signal needs to be received by a special receiver. Using this feature, the cable to be found can be identified. The principle of the cable identification instrument: the transmitter will input periodic unipolar voltage pulses into the cable to be identified, and the cable needs to be grounded at the remote end to ensure that there is enough current flowing through the cable.
The system is designed so that the return current does not return from the same cable, but from the ground. The direction of the pulse current in the input cable can be used as an obvious identification criterion. The outgoing current only passes through this cable, all other adjacent All return currents flow through the cable, but their polarities are reversed. In addition to the actual difference in current direction, the magnitude of the current is also an identifying feature, the current going out through only one cable, while the return current can pass through several cables, which means that the current flowing out is more than the current flowing through the other cables, and The return current through the ground is much larger. The task of the receiver is to detect the direction and magnitude of the current flowing through the cable.
To achieve this, a current sensor is used as a receiving sensor, the sensor clamps the cable under test, the current flows through the magnetic field generated by the cable, and a voltage is induced in the sensor coil. The voltage polarity is determined by the current direction and the sensor coil. direction decision. In order to get a voltage polarity with a clear direction of current flow, all the cables in a bundle are tested with the sensors taking the same direction. The voltage induced in the sensor coil is displayed on the meter head. If the sensor is connected in the above-mentioned way, the direction of the pointer swing can show the current direction, that is, only the pointer of the cable where the current flows out is biased to one side, and this is the cable you are looking for.
For all other cables, only return current flows, the pointer is deflected to the other side, or there is no pulsating current, and the pointer does not deflect. The amplifier adjuster on the receiver adjusts the signal strength. Well, the above list is the principle of the cable identification instrument, I hope it can help you.
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