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
During the use of high voltage power cables, due to various reasons such as external force, moisture, it can cause cable failure, seriously affect the safe operation of the cable, need to quickly find cable fault points in a short time, timely repair cable fault point, quickly recover For high voltage power cables during use, due to external force damage, the tide and other reasons can cause cable failure, seriously affect the safe operation of the cable, need to quickly find cable fault points in a short time, repair cable fault point, fast Restore power, so you need to use a cable fault tester. This article will briefly introduce the use of professional cable fault testers, and precautions. Professional cable fault tester is used as follows: 1. First, you need to specify the causes of the faults and the basic situation of the cable, for example, running to generate a fault or a pre-test failure, is a new cable or a long run time long cable, cable The probably length, there is no connector in the middle of the cable, there is no failure before the cable, the cable is buried or built in the cable, and the cable type, etc. 2. Be sure to ensure that the cable is detected in a stateless state, and the cable fault tester cable must be disconnected from other lines to ensure that the cable is electrically, the environment around the cable is in a safe state.
3, the tester must pay attention to the safety, each time the cable is connected to the cable, and the short-circuit line must be grounded at one end of the short-circuit line, and the other end is discharged separately. For other electrical appliances, such as capacitors, test transformers, etc., should pay attention to first discharge, and then wiring. In short, to form an operation habit, not afraid of trouble, before each operation, pay attention to the operating electrical appliance without the circuit connection, first discharge it.
4. When the cable fault tester is tested, first use the flash tester low-voltage pulse function, and perform the full length test of the cable, see if the three opposing tests, the test waveform is consistent. Most high resistance faults, each phase test waveform is consistent. For low-resistance failures, high-resistance failures in which there is a broken phase failure, the fault phase test waveform is inconsistent with the full length of the cable, which can directly test the fault distance with a low pressure pulse.
5. Test with high pressure flashing method, regardless of the cable failure is high resistance, or low-resistance faults, high pressure flushing can be tested. For low-resistance or disconnection failures that can directly test the failure distance with a low pressure pulse, it is generally necessary to verify the accuracy of the test and the fault point. When the cable fault tester high-pressure flashing method, pay attention to, regardless of the cable is a single phase failure or more faults, other cable phase lines are short-circuited to the cable to reduce the interference of other cables. Increase the test accuracy.
The above is a matter of professional cable fault tester when used, I hope to help everyone, more exciting content, let's see you next.
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