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 is the working principle of the cable fault tester manufacturer? The working principle of the power cable fault tester: The power cable fault tester is mainly composed of three parts: the power cable fault tester host, the cable fault locator and the cable path tester. The cable fault tester host is used to measure the nature of the cable fault, the full length of the cable fault, and the approximate location from the test end to the cable fault point; the cable fault locator is based on the approximate location of the cable fault point determined by the host. Cable fault tester; for buried cables with unknown directions, determine the exact location of the cable fault point.
The underground direction of the cable needs to be determined by a path meter. The basic method of power cable fault detection is to apply a high-voltage pulse to the faulty cable, so that the faulty cable breaks down at the fault point, and the breakdown point of the cable fault can generate electromagnetic waves and sound at the same time during discharge. The working principle of the arc reflection method (second pulse method) applied in the cable fault tester positioning: First, a certain voltage level and a certain energy high-voltage pulse are applied to the faulty cable at the cable test end to make the high resistance fault point of the cable. It can penetrate the arc; at the same time, when the low voltage pulse is added to the test end, when the measurement pulse reaches the high resistance fault point of the cable, it will encounter the arc and reflect the arc surface.
Since the high-resistance fault becomes an instantaneous short-circuit fault when the arc is ignited, the low-voltage measurement pulse has obvious impedance characteristics, which makes the flashover measurement waveform become a low-voltage pulse short-circuit waveform, making the waveform identification very simple and clear, which is called“second pulse method”. The received low-voltage pulse reflected waveform is equivalent to the complete short-circuit waveform of the wire core to ground. When the high-voltage pulse is released and the low-voltage pulse waveform is not released, both waveforms will have a divergent point, which is the reflected waveform point of the fault point; this method combines the low-voltage pulse method with the high-voltage flashover technique, which makes it easier for testers to determine The location of the point of failure.
How does a cable fault tester work? Cable fault tester manufacturer Shenzhen Noyafa Electronic Technology Co., Ltd.
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