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 Locator Suppliers
Cable fault locator manufacturer's method of cable fault locating What are the methods of cable fault locator manufacturer's cable fault locating method? Under normal circumstances, it is necessary to first judge the type of fault point, and then select the appropriate test method and corresponding instrument according to the type and nature of the cable fault. Coarse positioning There are two methods of rough positioning: bridge method and traveling wave method.
The traveling wave method is relatively popular. However, there are several cable faults that are difficult to find with the traveling wave method, such as high-voltage cable sheath insulation defects, steel tape armored low-voltage cables, pvc cables and short cables that cannot be located. In addition, some high-resistance breakdown points are difficult to locate when they cannot be broken down under the impulse voltage.
(1) Acoustic wave method: It is a high-voltage pulse generator discharges the faulty cable, the fault point generates an arc, and produces a discharge sound. In the case of direct burial of the cable, a seismic wave is generated, and the acoustic detection probe of the pointing instrument picks up the seismic wave signal. And amplified and output through headphones or meter. (2) Step voltage method: It is mainly aimed at fixing the ground fault of the outer sheath that requires the insulation of the outer sheath of the cable. Now, for some directly buried unarmoured low-voltage cables and wire cores, the ground fault can also be used. Step voltage legal point. (3) Electromagnetic method and audio frequency method: use electromagnetic wave fixed point or adopt audio frequency legal point, that is, use the change of electromagnetic wave signal or audio signal before and after the cable fault to determine the fault point.
(4) Acoustic-magnetic synchronization method: It is a comprehensive application of the acoustic measurement method and the electromagnetic wave method. The cable fault detection system integrates the functions of distance measurement, fixed point and path detection, etc. It can test the high resistance flashover fault, high and low resistance grounding, short circuit and cable disconnection, poor contact and other faults of the cable. It is suitable for testing various types of faults. Power cables of different types and voltage levels are faulty. What are the methods for locating cable faults? Shenzhen Noyafa Electronic Technology Co., Ltd.
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