Analysis of Working Principle of Cable Recognition Instrument
Keywords: GPS live cable pulse coupling frequency adjustable
Cable identification plays an important role in cable construction and maintenance. At present, there are two main types of cable identification: the power cable identification device and the live cable identification device. The live cable identification device has the function of the power cable identification device. The pulse polarity method is commonly used for power cable identification devices. Working principle: add a special signal to the cable to be identified, receive it with the receiver, and use this feature to identify the cable to be found (because the cable to be identified is out of power, the signal can be directly added, the test is simple, and the principle is not repeated. ).
Current identification methods for live cable identification devices include GPS method and pulse coupling method. The GPS method of using the live cable identification device uses the GPS synchronous clock signal control to synchronize the phase of the output signal of the power signal generator with the GPS second pulse. The method of selecting the target cable is as follows: the phase of the AC signal detected by the target cable is synchronized with the GPS, and the non-target cable is not synchronized. The apparatus for the identification of live cable used in this test method is extremely expensive, and is currently mainly produced abroad.
Nowadays, the commonly used live cable identification instrument is the pulse coupling method. The principle is as follows: The high-power signal generator of the live cable identification instrument feeds the periodic pulse signal into the live cable to be identified, and the receiver detects the size of the specific signal added to the cable. For this purpose, the receiver is equipped with an amplifier so that all other cables are tested with the caliper without the ammeter being oscillating or oscillating very little, and only the hands on the cable to be identified are swivelled.
YDL-2037 charged cable identification instrument uses the pulse coupling method. The biggest feature is: adjustable pulse signal frequency. In this way, when the field test encounters interference, the frequency can be adjusted to avoid interference! ! !
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