Product Details

Cable Identifier

Working Principle

In order to reliably and accurately identify cables, it is necessary to apply a special signal to the cable to be identified, which must be received by a dedicated receiver. Using this characteristic, the target cable can be identified. 

Cable IdentifierDLSB Cable Fault Locator works according to the following principle: 

  The generator feeds periodic unipolar voltage pulses into the cable to be identified, which needs to be grounded at the far end to ensure sufficient current flows through the cable. The system is designed so that the return current does not return through the same cable. By achieving this, the direction of the pulse current fed into the cable can serve as an obvious identification criterion. The outgoing current only passes through this one cable, while all other adjacent cables carry return currents, but with opposite polarity. In addition to the practical difference in current direction, the current amplitude is also an identification feature. The outgoing current only passes through one cable, while the return current may pass through several cables, meaning the outgoing current is larger than the return currents flowing through other cables. 

The receiver's task is to detect the direction and magnitude of the current flowing through the cable. To achieve this, a current clamp is used as a sensor, which is equipped with an amplifier and connected in series in the circuit. The clamp grips the cable under test. The magnetic field generated by the current flowing through the cable induces a voltage in the coil of the clamp. The polarity of this voltage is determined by the direction of the current and the orientation of the clamp coil. To obtain a clear voltage polarity indicating the current direction, all cables in a bundle are tested with the same correct winding direction. This is why there is an arrow marked on the clamp. The direction of the arrow on the clamp should point towards the far end of the cable. The voltage induced in the clamp coil is displayed on the meter. If the clamp is connected as described above, the direction of the pointer swing can indicate the current direction. That is, only the cable with outgoing current will cause the pointer to deflect to the right, and this is the cable to be found. All other cables only carry return current, causing the pointer to deflect to the left, or if there is no pulsating current, the pointer does not deflect. The amplifier adjustment on the receiver can adjust the signal strength.



Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.