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 Tester
Question: Applicability of Tone Induction in Cable Fault Test Answer: Tone Induction in Cable Fault Test is generally used to detect low resistance faults with fault resistance less than 10 ohms. When the grounding resistance of the cable is low, if the high-voltage impulse discharge method is used Question: Scope of application of the audio-frequency induction method in the cable fault test Answer: The audio-frequency induction method in the cable fault test is generally used to detect low-resistance faults with fault resistance less than 10 ohms . When the grounding resistance of the cable is low, if the high-voltage impulse discharge method is used, the discharge sound of the fault point is weak, and it is difficult to locate the fault point by the acoustic measurement method, especially the fault point of the metallic ground fault has no discharge sound at all and cannot be fixed.
At this time, it is necessary to use the audio induction method to fix the point. The audio induction method can be used to test two-phase short-circuit and grounding fault, and three-phase short-circuit or three-phase short-circuit and grounding fault, and satisfactory results can be obtained. Other types of faults, such as one-phase or two-phase disconnection, single-phase grounding and other fault locations, can also be accurately detected by using special wiring methods.
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