Author: Noyafa–Noyafa Cable Tester
Cable fault detection method Shenzhen Noyafa is a manufacturer specializing in the development and production of cable fault testers. The cable fault tester equipment produced by our company is widely praised in the industry. Method Shenzhen Noyafa is a manufacturer specializing in the development and production of cable fault testers. The cable fault tester equipment produced by our company is widely praised in the industry. The company produces multiple pulse cable fault testers using the international high-level arc reflection ( Multiple pulses) technology, all high-resistance fault test waveforms are presented as simple low-voltage pulse waveforms, and it is easy and pleasant to judge the fault distance. Shenzhen Noyafa introduces the cable fault detection method - acoustic measurement method: For the fault that the cable sheath has been burned through, the discharge sound of the fault point can often be heard directly on the ground with the human ear. However, for cable faults where the cable sheath has not been burned through or the cable is buried deep and the transition resistance is small, it is possible to reduce the discharge sound at the fault point. The weak seismic waves on the ground are converted into electrical signals, and the signals are amplified by relevant instruments, and then restored to sound by earphones, or the intensity of the sound is displayed through a display device.
The basic principle of the acoustic measurement method is to use the DC high voltage to discharge the high-voltage capacitor, use the sound signal generated by the discharge of the power cable fault point to determine the point, and use the sound sensor to detect the sound signal above the power cable, and the place with the loudest sound is the fault point. s position. This method is mainly used for the fixed point of high-resistance faults of power cables. If the cable has a low-resistance fault, such as the fault resistance is less than ohms, and the discharge sound at the fault point is very weak, it is difficult to detect the sound of discharge at the fault point or there is no discharge sound at all, so the low-resistance fault cannot use the sound test method. Perform fault location.
In practical applications, the acoustic measurement method is often disturbed by environmental factors at the fault point of the cable, such as excessive vibration and noise, and the cable is buried too deep, which makes it difficult to locate the point. In order to solve this contradiction, the acousto-magnetic synchronous detection method, that is, the acousto-magnetic method, is adopted. Shenzhen Noyafa is a source enterprise specializing in the production of power testing equipment. It is a manufacturer of insulation resistance testers, grounding resistance testers, cable fault testers, etc. The company has won unanimous praise from the market and customers with its good credit and high-quality products.
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