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Technical indicators:
1. Power supply of the instrument: The host of the cable identification instrument is powered by AC 220V, and the receiver is powered by a 9V battery.
2, caliper: caliper is a current exchanger, jaw mouth size is 120mm, in the caliper induced voltage, voltage amplitude determined by the current intensity, the polarity is determined by the direction of the current.
working principle:
In order to identify the cable reliably and accurately, it is necessary to add a special signal to the identified cable. This signal is to be received by a dedicated receiver, and this characteristic can be used to identify the cable to be found. The generator feeds periodic, unipolar voltage pulses into the cable to be identified, which needs to be grounded at the far end to ensure that there is enough current to flow through the cable. The system should be designed so that the return current does not return from the same cable. To do this, the direction of the pulsed current fed into the cable can be used as an obvious identification criterion. The current flowing out only passes through this cable. All other nearby cables flow in return current, but their polarity is reversed. In addition to the actual difference in current direction, the current amplitude is also a distinguishing feature. The current flowing out passes through only one cable and the return current can pass through several cables, which means that the current flowing out is more than the return current flowing through other cables. Big. The task of the receiver is to detect the direction of the current flowing through the cable and its size.
To achieve this goal, a current sensor is used as a sensor. It has an amplifier and is connected in series with the circuit. The sensor clamps the cable under test. The current flowing through the cable induces a voltage in the coil of the sensor. The polarity of the voltage is It is determined by the direction of the current and the direction of the sensor coil. In order to obtain a significant voltage polarity in the direction of the current, all cables in a bundle are tested in the same correct direction. The voltage sensed in the sensor coil is shown in the meter head. If the sensor is connected in the above manner, the direction of the pointer's swing can show the direction of the current, that is, only the current that flows out of the cable is deflected to the side. This is the cable to be found. All other cables only flow back through the return current, the hands are deflected to the other side, or there is no pulsating current, and the hands do not deflect. An amplifier on the receiver adjusts the signal strength.
The cable identification instrument is a special instrument used to identify a specific cable from a bundle of cables in the installation, migration maintenance and troubleshooting of the power cable. In recognition of a particular cable, in addition to using the current direction as a standard, it also uses the current amplitude value as a criterion for judging that the double criteria is more likely to reliably and accurately identify the cable. The instrument is a small, hand-held, compact device that is housed in an aluminum alloy case and consists of a generator, a receiver with caliper, and wiring.