LB15 Cable Fault Location Bridge

Cable Identifier:

SPECIFICATION:

Application:

1.     Fault pre-location for high, medium and low voltage power cable of 380V-220KV.

2.     Fault pre-location for outer sheath fault of 35KV-220KV.

3.     Fault location for single core insulated cable without metal shield: overhead cable fault location.

4.     High resistance breakdown point of cable after laying, especially the liner high resistance breakdown point which is difficult to burn to low resistance, such as the liner high resistance breakdown in intermediate joint.

5.     Bridge balance method has no blind zone, which can be used to test effectively short cables (1m-40m) fault and the breakdown point near the end.

6.     PVC insulated cables, cables without good conductor backflow, metal sheath defect points of ultra

 high voltage cable and cables only with steel armored.

7.     The bridge method only requires uniformity of cable core resistance. Such faults here follows can 

only be located by the bridge method: cables with poor wave property (such as PVC cable with big dielectric loss), cable with no good conductor backflow, metal sheath defect points of ultra high voltage cable and cables only with steel armored.

8.     Fault points not broken down yet but with low resistance, such as the insulated fault point when the cable resistance is found low with megameter, but with no breakdown under working voltage.

Schematic diagram of LB15fault location

In figure L1/2L=R1/(R1+R2)=r1/(r1+r2),fault distance L1=2L×r1/(r1+r2).r1/ (r1+r2) is got from the 

dial scale after the balance of the bridge. 

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Xianheng International Science&Technology Co., Ltd.

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