Method For Finding Broken Cores Of Insulated Wires

Method for finding broken cores of insulated wires

Some common faults may occur during the use of cables, such as cable penetration, cable conductor damage, broken cores and other common faults. The conductors of insulated wires have a small range of cross-sections, and are likely to be torn off during the process of making cables and flame-retardant plastics. So how to check the disconnection of insulated wires?

One: the way of plugging in capacitors

The behavior of some wire and cable factories in this regard is usually to use the comparative analysis method of capacitors to search for the approximate location of the disconnection. Use the method of continuous plugging in to better disconnect the cable, which is very inefficient. Generally, it takes about an hour and a half to search for a disconnection point. This kind of method is basically impossible to find broken cores for the insulated wires that have been shielded, armored, and sheathed. Most of these methods are no longer needed today.

Two: The fusion of capacitor method and magnetic induction method:

This type of method is applied to the broken core of the cable core, which stipulates that the cable core is not covered with a metal material layer and the outer sheath is not extruded. In the case of finding, first use the capacitor to find the approximate part of the cable disconnection, and then use the induced voltage method to accurately search for the disconnection point. This method is very simple and convenient, and it is a method that is widely used at this stage. . The induced voltage method is to connect one end of the broken core of the wire and cable with 650V AC current, and the other end and its core shaft grounding device, and then use a sensor pen that can emit a light signal light to not light up. If the place slips out of date, the data signal will change, so that the disconnection point of the cable can be accurately searched.

Three: the direct integration of the DC power supply and the bridge method

Such methods are used for cables or cable cores that have been covered with layers of metallic material. The application is that the search method is to first use the DC power supply to scorch and penetrate the insulation layer at the broken core of the insulated wire, and then use the bridge method common fault detector to accurately and accurately locate the fault point, which is often used. Way.