Author: Noyafa–POE Tester
In the process of using high-voltage power cables, if a fault occurs, the power supply will be interrupted. It is necessary to detect in time, quickly find the fault point, and use the cable fault detector. A brief introduction to the capabilities of the cable fault tester.
System composition of the cable fault tester: The cable fault tester consists of a test host, a path signal generator, a path signal receiver and a locator. The cable fault tester includes functions such as integrated computer, low-voltage pulse generation and data processing, which can be used to test the fault distance, and can also be used to measure the cable length and the propagation speed of electric waves in the cable. The path signal generator generates intermittent sine wave signals with a frequency of 30kHz and an amplitude of 30V for finding cable paths.
The path signal receiver is used to receive the path signal, determine the direction of the cable and estimate the buried depth of the cable. The locator is used to accurately locate the fault point. Technical performance of cable fault tester: 1.
Fault testing system: It can test various faults of power cables, open-circuit and short-circuit faults of coaxial communication cables and local telephone cables. It measures the speed of wave propagation in any known length of cable. The test distance shall not be less than 16km2.
Path signal generator: output signal frequency 30kHz, oscillation mode, intermittent 3. Locator: Test Sensitivity: 50ΩThe internal resistance signal source outputs a 300Hz signal. When the output is maintained at 2V and the signal-to-noise ratio is greater than 20:1, the input signal of the pointing instrument is not greater than 10μv. Input impedance: not less than 1.2kΩ.
Fault test method: The fault test is generally divided into the following steps: First, understand the basic situation of the faulty cable: use a high resistance meter and a multimeter to measure the insulation resistance of the faulty cable, use a low-voltage pulse to measure the full length of the cable, whether there is a disconnection, short circuit, etc. In seconds, determine the appropriate test method according to the specific situation of the fault, and measure the cable fault distance. Generally, the DC resistance value is lower than 100ΩThe disconnection faults and cable faults are called low resistance (open circuit) faults, which are tested by the low-voltage pulse method, and other faults are tested by the flash method or the direct flash method. Third, detect the buried depth and path of the cable near the fault point.
Determine the exact location of the point of failure. Before testing, disconnect all conductors from the beginning and end of the cable. The panel of the test system has“input amplitude”and“displacement”Two knobs are used to adjust the amplitude of the input signal for the next sampling and the up and down position of the waveform.
What are the functions of the cable fault tester? The cable fault tester manufacturer Shenzhen Noyafa Electronic Technology Co., Ltd.
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