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–CCTV Monitor Tester
Cable fault detection service wire and cable fault detection shock high-voltage flashover method Low-resistance short-circuit fault and disconnection fault can be measured). It is an efficient, reliable and widely adaptable cable fault testing method. 1. Test principle of shock high voltage flashover method: apply a shock high voltage at the beginning of the faulty cable to break down the arc at the fault point.
Use the voltage jump at the moment of the fault breakdown as the test signal. Investigate the moment when this signal makes a round trip between the fault point and the beginning of the cable. There are many signal sampling methods for cable fault detection service impact high-voltage flashover method. Commonly used methods include voltage sampling method, terminal voltage sampling method, and current sampling method.
At present, the voltage sampling method is gradually eliminated due to safety reasons. At home and abroad, the current sampling method has been widely used. The current sampling method uses the principle of electromagnetic induction, and uses the current transformer to pick up the current signal on the ground wire to obtain the reflected signal of the electric wave current in the cable.
There is no electrical relationship with the high-voltage generator and mains, so it is particularly safe. The waveform obtained by the current sampling method has many cycles, and the characteristic inflection point of the reflected waveform is clear, which is especially beneficial for fault interval analysis and positioning of cable fault detection services. resistance failure, the instrument is in the external trigger state. The method steps are basically the same as the low-voltage pulse test method.
But it must be adjusted accordingly in the preset interface. After the instrument enters the preset interface, preset it according to the type of the tested cable and the test method. continuous click“test method”key to set the instrument to“high pressure flashover”.
condition, while red on the instrument panel“Flashover”The indicator light is on. The instrument enters the wait-for-trigger state. Testing the high resistance faults of cables by the shock high voltage flashover method is the most popular traditional testing method in China.
Many users are used to it. The external circuit is relatively simple, but the waveform analysis is more difficult. Only on the basis of a large number of cable fault tests, can you master it with certain waveform analysis experience. Cable fault detection service The impact high-voltage flashover method is mainly used to test the high-resistance fault of the cable, whether it is a leaking high-resistance fault or a flashover high-resistance fault (of course, it can also measure the low-resistance short-circuit fault and disconnection fault).
It is an efficient, reliable and widely adaptable cable fault testing method. Shenzhen Noyafa Electronic Technology Co., Ltd. is a high-tech enterprise engaged in scientific research, production and sales, and provides technical services for cable fault detection. At present, a variety of high-voltage test equipment and testing instruments have been widely used in the industry. At the same time, our company provides technical services such as cable fault detection and substation testing and testing to users across the country. The core engineer responsible for providing technical services has 20 years of on-site testing. Experience, can provide solutions according to different types of cables and site environment.
Wire and cable fault detection shock high voltage flashover method cable fault detection service Shenzhen Noyafa Electronic Technology Co., Ltd.
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