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–POE Tester
What are the precautions for the operation of the cable fault tester? Cable fault tester manufacturer Cable fault tester What should be paid attention to in operation? 1) First of all, list the possible causes of the fault and the basic conditions of the cable, such as whether the fault occurs in the operation of the cable fault tester, what should be paid attention to? What matters should be paid attention to in the operation of the cable fault tester manufacturer? 1) First, list the possible causes of the failure and the basic conditions of the cable, such as whether the failure occurred during operation or trial operation, a new cable or a cable that has been running for a long time, the approximate length of the cable, whether there is a connector in the middle of the cable, the previous cable Whether there is a fault, whether the cable is directly buried or laid in the cable groove, the type of cable, etc. 2) We must make sure that the cable is not tested before it is powered on, both ends of the cable must be disconnected from other lines to ensure that the cable is not powered. The environment around the cable is in a safe state.
3) Testing personnel must pay attention to operational safety. Each phase of the cable should be short-circuited and discharged before each connection to the cable. When discharging, one end of the short circuit must be grounded, and the other end must be connected to each phase of the cable to discharge separately.
For other electrical appliances, such as capacitors, test transformers, etc., pay attention to discharge before wiring and wiring. In short, in order to form an operating habit, do not be afraid of trouble before each operation, pay attention to whether the operating appliance is connected to the circuit, and then perform the operation again. 4) In the test, first use the low-voltage pulse function of the flashover meter to test the full length of each phase of the cable to see if the three-phase armored test waveforms are consistent.
For most high resistance faults, the waveforms of the phases are consistent. For low-resistance faults and high-resistance faults with open-phase faults, the fault phase test waveform is inconsistent with the full length of the cable under test, so low-voltage pulses can be used to directly measure the fault distance. 5) When the cable fault tester uses the high-voltage flashover test, the high-voltage flash method can be used to test whether the cable fault is a high-resistance fault or a low-resistance fault.
For low-resistance or disconnection faults that can be directly tested by low-voltage pulses, it is generally necessary to use high-voltage flashover to verify the test and accurately locate the fault point. ?6) Complete the high-voltage flashover test, determine the fault distance, and accurately locate the fault. When used, fault location and path detection can be performed simultaneously.
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