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–POE checker
Cable identifiers are typically used to identify cables from a bundle of cables. It consists of a signal generator, a receiver with sensors and wiring. It is a common equipment in cable installation, migration, maintenance and troubleshooting.
According to the conditions of use, the cable identifier can be divided into cable identifiers are generally used to identify cables from a bundle of cables. It consists of a signal generator, a receiver with sensors and wiring. It is a common equipment in cable installation, migration, maintenance and troubleshooting.
According to the conditions of use, cable identifiers can be divided into live cable identifiers and non-live cable identifiers. Let's talk about how to use each of them. Live cable identification instrument search method When the line is live, we cannot affect the normal operation. When identifying the live cable, the inductive method is used to measure, transmit high-frequency signals through the caliper, and the receiver receives the signal characteristics through software and hardware filtering. , During the phase identification, when the receiving caliper clamps the cable according to the current direction, the identified cable ammeter is deviated to the right, accompanied by sound and light indication.
The current direction of other cables is opposite to the current direction of the identified cable, and the pointer of the ammeter is shifted to the left. There is no sound and light indication. This reflects the uniqueness of the identified target cable.
It is easy to distinguish the identified cable from multiple cables. Since the signal current strength on the identified cable is the same across the board, the electromagnetic signal strength received by the receiving caliper along the cable is the same. The cable is not limited by the length of the identified cable. The search method of the dead cable identification instrument is basically the same as that of the live identification instrument. The generator feeds periodic unipolar voltage pulses into the cable to be identified. The cable needs to be grounded at the remote end to ensure Sufficient current flows through the cable, and the direction of the pulsed current fed into the cable can be used as an obvious identification criterion. The outgoing current flows only through this one cable, all other adjacent cables are return currents, but their polarity is opposite, the direction of the current flowing through the cable and its magnitude are detected by the receiver, which has an amplifier and When connected in series in the circuit, the sensor clamps the cable under test, and the magnetic field generated by the current flowing through the cable induces a voltage in the coil of the sensor.
At present, the cable identification instrument plays an increasingly important role in cable troubleshooting and maintenance, and is also used by more and more power companies or maintenance personnel. The above is an introduction to the search method of the cable identification instrument. , Different methods have different needs, I hope to be able to help friends.
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