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
The function and principle of the live cable identification instrument You all know the function and principle of the live cable identification instrument A specialized instrument identified in a bundle of cables. The whole instrument is installed in an aluminum alloy box and consists of a signal transmitter host, a sensor, a receiver and a connection. 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, and the cable to be found can be identified by using this feature.
The transmitter sends periodic unipolar voltage pulses into the cable to be identified, and the cable needs to be grounded at the far end to ensure a sufficiently large current flows 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 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.
The role of the live cable identification instrument The price of the live cable identification instrument is Shenzhen Noyafa Electronic Technology Co., Ltd.
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