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–Cable Tester Manufacturer
Question: Explain the test of cable fault location in detail. Answer: Cable fault location test The distance between the transmitted pulse and the reflected pulse is the distance from the test end to the fault point. Edit The current domestic cable testing technology is changing with each passing day. There are many new and original problems in the testing technology: explain the test of the fault location of the cable in detail. Answer: The distance between the transmitted pulse and the reflected pulse of the cable fault location test is the distance from the test end to the fault point.
Edit The current domestic cable testing technology is changing with each passing day. There are many new principles of testing technology. The same principle, different manufacturers have different implementation methods and different names.
Since there are no corresponding standards in new technology countries, users' technicians cannot distinguish. Summarized as follows: Pulse method: test low resistance, short circuit, open circuit fault and full length: low voltage pulse method, use the pulse signal (pulse width and amplitude can be adjusted, the amplitude can be adjusted up to 200V) from the instrument itself, and apply the core wire or ground of the cable Wire. When the pulse signal encounters a low resistance, short circuit or open circuit fault, a reflected signal will be generated, and the full-length waveform and judgment are the same as the open circuit fault.
The low-voltage pulse method has become one of the most basic functions in the pulse test instrument because of its simplicity and ease of use. Testing high-resistance faults (high-voltage pulse method): method introduction Double impact arc method (three-pulse method) The core of this method is. The shock and arc expansion circuit is divided into two parts. The impulse circuit mainly performs impulse breakdown on the fault point, and the impulse energy obtained by the fault point is large. When the surge voltage drops and stabilizes, a small current is applied through the arc suppression circuit to prolong the breakdown time of the fault point, and the low-voltage pulse test signal is loaded. To test the fault point distance (short circuit waveform).
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