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 Tester
How to use the cable identifier How to use the cable identifier How to use the cable identifier How does the cable identifier work? The cable identification instrument is a special instrument developed according to the needs of the electric power industry. Cable identifiers are used to identify the operational status of cables during erection, relocation, maintenance and troubleshooting. It can also identify the cable to be found among multiple cables of the same type, accurately find the short-circuit point of the short-circuit cable (the short-circuit resistance is about zero).
It has the characteristics of accuracy, speed, simple operation and wide application. The cable identification instrument consists of two parts: the host and the detector. The host mainly generates special pulse modulated signals, which are applied to the stop cable to be searched.
The detector looks for the cable under test in the field. When the detector detects a cable with a special signal, the detector will issue intermittent sound and light prompts. Because the signal detected on the cable is too small, the instrument pointer on the detector will swing synchronously with the modulation frequency of the applied signal. By indicating the intensity of sound and light signals and meters. The detector is an electromagnetic induction detector with three indications of sound, light and electricity.
When a signal is detected, sound, light prompts and meter indication are given at the same time. When using the detector, the current clamp can clamp the cable. How the Cable Identifier Works The generator inputs periodic unipolar voltage pulses into the cable to be identified.
The cable needs to be grounded at the far end to ensure enough current flows through the cable. The design of the system should ensure that return current does not flow back from the same cable, which is achievable. The direction of the pulse current input cable can be used as an obvious identification criterion.
The outgoing current goes through this cable only, all other adjacent cables go through the return, but they have opposite polarities. In addition to the actual difference in current direction, current magnitude is also an identifying feature. The outgoing current goes through only one cable, while the return flow can go through multiple cables, which means that the outgoing current is greater than the return flow through the other cables.
The task of the receiver is to detect the direction and magnitude of the current flowing through the cable. For this purpose, current sensors are used as sensors. It has an amplifier in series in the circuit.
The sensor clamps the cable under test. The magnetic field created by the current through the cable creates a voltage in the sensor coil. The polarity of the voltage is determined by the direction of the current and the direction of the sensor coil.
In order to get a voltage polarity with obvious current direction, test all cables in a bundle with the same correct direction. The voltage induced in the sensor coil is displayed on the meter header. If the sensor is connected as above, the swinging direction of the pointer can show the current direction, that is, only the cable that flows from the current will have the pointer to one side, which is the cable to be found. All other cables only flow through the return flow and the pointer is deflected to the other side, or there is no pulsating current and the pointer is not deflected.
The amplifier adjuster on the receiver adjusts the signal strength. How to use the cable identifier How to use the cable identifier Shenzhen Noyafa Electronic Technology Co., Ltd.
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