Author: Noyafa–CCTV Tester
Precautions during use of the cable identifier The cable fault tester is a comprehensive set of equipment. It is used for the test of power cable open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance leakage fault, as well as matters needing attention in the use of coaxial communication cable and local telephone cable cable identification instrument. The cable fault tester is a Set of comprehensive equipment. It is used to test open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance leakage fault of power cable, as well as accurate test of open circuit and short circuit fault of coaxial communication cable and local telephone cable.
It can also test the cable path, burial depth, and the speed of the radio wave, and verify the cable length, etc., and can establish a cable file for daily maintenance and management. Precautions during use: 1. When testing with the pulse method, be careful to throw off all the equipment in the office and measure on the outermost line. 2. When using the flashover method to test, the trigger working mode switch must be placed in the“Flashover”Location.
3. Pay attention to personal safety and equipment safety when using the direct flash method or the dash flash method for testing. The ground wire must be connected. 4. After the flashover test is over, cut off the power supply, remove the connection line between the instrument and the high-voltage test device, and then discharge the stored charge of the high-voltage capacitor and cable.
When discharging, a current limiting resistor R should be added to limit the discharge current to discharge the current slowly. After the voltage on the capacitor is reduced, the resistance in the discharge circuit to the ground is zero, and the instantaneous discharge current can be as high as several hundred amperes, which will cause serious damage. equipment or personal accident. 5. During the test of the direct flash method, attention must be paid to monitoring the leakage current of the fault. If the current suddenly increases and the fault flashover phenomenon does not appear, the test voltage should be lowered immediately and the flashover method should be used instead. The smoothness of the cable fault test system and the transmission of power depend on the normal operation of the cable line.
Once there is an obstacle in the line, it will cause interruption of communication and power. If the fault cannot be detected in time and eliminated quickly, it will cause great economic loss and adverse social impact. Therefore, maintenance personnel should pay attention to ensure the normal operation of the cable fault tester during the work process.
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