Author: Noyafa–CCTV Tester
Buried cable fault tester How to find and analyze the fault point On-site situation The cable to be tested is a high-voltage cable, and all three phases are short-circuited. How to use the buried cable fault tester When using the cable fault, first separate the two ends of the cable from the system, and then how to find and analyze the on-site situation of the fault point. The cable to be tested is a high-voltage cable, and all three phases are short-circuited . How to use the buried cable fault tester When using the cable fault, first separate the two ends of the cable from the system, and then use the red and black clips of the instrument host to connect to the AB two-phase respectively. The short-circuit distance is 312 meters, and the total length of the cable is 639 meters. Meter, the result of receiving any other two-phase is the same, we determine that all three-phase are short-circuited.
If the user knows the direct buried path of the cable, then we can search within the range of 312 meters, and then use the red clip of the transmitter in the path meter to connect to phase A, the black clip to ground, and use the low-frequency high-grade loop resistance of 580 ohms. Because the cable before and after 312 meters is buried relatively deep, the depth measured by the 80% method is 3 meters, the gain 66DB signal is about 675, and the signal is very stable without obvious attenuation. After the cable path is clear, use high voltage to boost and discharge the A phase, the voltage rises to 8KV and fully discharge, start the fixed point from 180 meters, and finally find the fault point. After communicating with the customer, I used an excavator to dig out the fault point after more than an hour.
Mainframe function of buried cable fault tester 1. It can measure the high and low resistance faults of all cables below 35KV, and has a wide range of adaptability; 2. It has user-friendly software and full Chinese menu, and the key definitions are simple and clear , the measurement method is simple and fast; 3. The failure detection success rate, test accuracy and test convenience are better than any domestic testing equipment; 4. The 8-inch color LCD touch screen is used as a display terminal, and the instrument has powerful data processing capabilities and friendly display. Interface; 5, with sampling high voltage protection measures. The test instrument will not crash and be damaged in the shock high voltage environment; 6. The built-in power supply can test the open circuit and low resistance short circuit faults of the cable in the environment without power supply.
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