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 Tester Manufacturer
Shenzhen cable fault tester How to detect the street lamp cable fault First, use the megohmmeter to detect this method is the traditional street lamp cable fault detection method. The power supply radius of the street light line is generally between 0.4-0.6km, and the distance between the street lights is 30-40m. The whole line is like a tree trunk, and the load is relatively scattered. To detect the insulation resistance between phases and ground of the cable, the load of the street lamp must be cut off first, and then the middle point is selected to disconnect, and the phase-to-phase and ground insulation tests are carried out with a megohmmeter, and the direction of the fault point is judged by the elimination method.
This method is basically no longer used. 2. Detecting with a clamp-type ammeter The principle of using a clamp-type ammeter to detect the street light cable is: by restoring the burnt fuse, the street light cable is powered instantaneously (2-3 seconds) (Note: The short-term instantaneous current will not Make the street light cable heat up quickly, that is, it will not cause new damage to the street light wire and cable). When the current value is the normal value, the previous gear distance of the lamp position is the fault point. 3. Detecting with a special fault tester for street light cables At present, there is a three-in-one instrument that integrates the path detection of street light wires and cables, the measurement of buried depth and the location of fault points.
This detector is small in size and can be placed in a portable toolbox. It is light in weight and can be easily operated by a single person. It is powered by batteries and does not require 220V power supply, so it is suitable for field operations. High, not subject to external interference; not affected by the underground conditions of cables (forks, twisted joints, windings), like mine detection, point-to-point to find the fault point, the error is measured in centimeters; not affected by ground conditions, such as floor tiles, greening Belt, cement surface, etc. The detector consists of a transmitter and a receiver. The transmitter can use single-frequency transmission or radio frequency transmission according to the site conditions (audio is suitable for long distances, and radio frequency is suitable for short-distance and interference situations); The rod induction signal determines the path and fault point of the street light cable, and it is easy to operate and accurately locate the fault point of the street light cable.
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