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Broken core searching method for flame retardant cable

Release time:2016-08-29 16:02 hit:


searching method for flame retardant cable
 
1. Method of electric capacity
 
Some cable plants in this area usually use comparison capacitance method, to find the location of the broken line. The efficiency of this method is very low in the way of using the power cable to correct the breaking point of the cable. Generally find break point need 1.5 hours or so. This method for shielding, armour, sheath process has been completed. For flame retardant cable, it is almost impossible to find the broken core, pretentious bad words will also enable flame retardant cable scrap. This method is now basically no longer used.
 
2. the combination of capacitance and induction:
 
This method is used in the cable core, which requires that there is no metal layer outside the cable core and there is no extrusion cladding. First find the capacitance to find the approximate location of the cable line, and then use the induction voltage method to accurately find the break point, this method is very simple and fast, but also the most widely used method. Induction voltage method is in the cable fault core end is connected to the AC voltage 650V and the other end of the other cores ground connection, and then can be used to signal light induction pen test, when test induction pen slide from the fault core, the signal will be changed, which can accurately find cable break point.
 
3. the combination of constant current source and bridge method
 
This method is used for the completion of cable or cable core that has been coated with metal layer. Finding method is to use constant current source will be flame retardant cable off the core of the insulation burn paste, breakdown, and then use the bridge method fault locator accurate location of the fault point, is often used one way.


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