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
The cable has the effect of transmitting electricity, and the cable is indispensable in daily life. However, no matter what item, long-term use, will have wear, or malfunction. The cable fault tester is specifically used to find a cable fault point, and the cable has the function of transmitting electricity, and the cable is indispensable in daily life.
However, no matter what item, long-term use, will have wear, or malfunction. Cable fault tester is dedicated to finding cable faults, only finding a fault point, staff can solve problems in time. Today, I will introduce us to the use of mining cable fault testers.
Method of use of mining cable fault tester: Cable fault Tester cable fault tester test cable failure adopted by the cable fault“Echo test"The principle, that is, the transmission reflection of radio waves in the cable is tested. 1. Pulse method test principle: Pulse method is a pulse wave internally producing a pulse wave, which is added to the cable. When the pulse wave encounters the change in the modulation of cable characteristics, a echo signal is generated ( Depending on the transmission line principle), the instrument collects both signals (emission waves and echoes) in the cable test end, calculates the distance between the fault and the test end according to the time difference of the two waves. Therefore, this test method is not affected by the rule of the cable, only related to the transmission speed of the radio wave in this cable.
2, high pressure flashing method test principle: When the high-resistance of the cable is faulty, use an external device to apply high pressure to the cable. When the fault cable does not accept the high pressure, the fault point will generate a breakdown arc. The breakdown arc will generate an echo, so that we can record the entire breakdown process in the form of the test end using the tester, and analyze the distance from the test end through this breakdown process. Also, this test method is not affected by cable laying, only related to transmission speed in this cable.
The cable fault test program should be carried out as follows: (1) Wild menu, shake the table, or the cable pre-test results to determine the cable fault properties. (2) Select the appropriate test method according to the cable fault properties. Low-resistance faults and pulse faults, of course, the flashing method can also be used for low-resistance failures.
Leakage high resistance failure adopts a flash method (rush L method), some leakage high resistance failures can also be blocked, but usually do not do so, the flashlight high resistance fault uses a straight flash, or two Both methods measure the accuracy of each other to improve judgment. (3) Select the working ground point and lead two ground lines from the selected grounding point, and the other of the instrument is connected to the ground. The selection principle of the work ground is to ensure that the test phase is configured as a closed loop to make the instrument obtain the correct test waveform.
It should also be noted that the work ground must be connected with the system, enabling people, instrumentally, high-pressure equipment, and quarters of the test cable. To ensure personal safety and instrumentation equipment is intact. If the cable is a fault, the work ground must be one of the phases, and the phase line of the floor must be connected to the system.
(4) Test the full length of the cable with the pulse method to calibrate the radio wave transmission speed of the cable being measured. (5) Rough test according to the selected test method, if a test method is not ideal, other methods can be used to compare the test. (6) After the rough test is completed, the fault point is fixed.
(7) After the test is completed, experience summary and error analysis can be performed if necessary. About the use of mining cable fault tester today introduces it here, hoping to help people with needs.
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