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–Cable Length Tester
In the case of multiple cables in the cable trench, it is necessary to identify one of the designated power-off cables, calibrate and move each cable, or cut off the construction, and other cables in the trench operate live. It is necessary to use the cable identification instrument to do a good job in the case of multiple cables in the cable trench, identify a specified power-off cable, and calibrate and move each cable, or cut off the construction of the project. , other cables in the trench run live, it is necessary to use the cable identification instrument to determine the identification of the cables. Next, the editor will share some relevant knowledge about the cable identifier. The importance of identifying cables: Cables are divided into signal cables and power cables.
The power cable is the carrier for transmitting electrical energy, and the power grid system is also composed of cables. The power consumption from the source power plant to the end user relies on the transmission of cables. When a new cable is laid, the power supply department will keep a record of the direction and identification of the cable, so as to avoid the confusion of cables and power equipment during power maintenance in the future, resulting in major safety accidents.
When do you need to search for cables? When you need to search for cables, you are usually buried in cable trenches or in large buildings. In these two cases, we will use the cable identifier to find out when we cannot see the direction of the cable with the naked eye. For example, there are ten identical cables in a cable trench. We know that the beginning of the cable is connected to the transformer, but after a long-distance wiring, we can't tell which cable is which when we reach the end of the cable. At this time, we You can use the identifier to find and mark both ends of the cable.
Principle of cable identification instrument search method: The cable identification instrument is composed of three parts: a signal generator, a receiving identification clamp and an indicator meter. When the receiving identification clamp signal detector is used, the signals detected on other cables are much smaller and in opposite directions. The meter indicates the magnitude and direction, making it easy to determine the cable under test. It is used to identify a specific cable to be found in a bundle of cables in the erection, migration, maintenance and troubleshooting of power cables; it has the ability to identify cables accurately (dual judgment of direction and amplitude), fast, simple operation, wide application, etc. Features. The live cable identification instrument is a new type of instrument with advanced technology and superior performance among similar instruments in China.
For cable identification, we can divide it into two cases: live identification and non-electric identification. When looking for a running cable, we use the coupling method of the cable identification instrument. The transmitting clamp clamps the beginning of the cable and feeds periodic unipolar voltage pulses to the cable through the signal transmitter; when the cable is powered off or has not been powered on, it can be used directly. In the connection method, the signal transmitter directly applies the pulse signal to the copper core of the cable through the wire. When measuring at the end, we use the receiving clamp to clamp the cable. When the pulse signal is detected from the measuring cable, the pointer of the receiver dial will move toward“correct”Square deflection, if it is not for this cable, the dial pointer will point to“mistake”.
Among multiple cables, we can find the required cable by measuring and identifying by the exclusion method.
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