Simulating The Process And Results Of The Tensile Strength Test Of Opgw Broken Strand Pre-twisted Wire After Repair
Before conducting the simulated strand break repair test, in order to verify the RTS of the original OPGW optical cable, the original OPGW1 and OPGW2 optical cables were subjected to tensile strength tests, respectively, proving that the tensile strength of OPGW1 and OPGW2 optical cables both met the above RTS requirements. Then the simulated strand break repair tensile strength test was conducted according to the following test process.
(1) The number of broken strands of the outer aluminum alloy monofilament of the simulated OPGW optical cable was 80%, and the tensile strength test was conducted using armour rod repair strips and optical tests were performed at the same time.
① Artificially cut off 80% of the aluminum alloy monofilaments on the outer layer of the OPGW1 optical cable, i.e. 10 strands, at the same place, and then wrap the test armour rod in transmission line repair strip P1 around the outer layer of the cable with the breakpoint as the center;
② Use two pairs of tension clamps J1 to fix the two ends of the OPGW1 optical cable at both ends of the tensile testing machine;
③ Mark the two ends of the armor rods conductor repair strip with a marker;
④ Ring all the optical fibers of the OPGW1 optical cable, and connect the optical fibers at both ends to the optical power instrument to test the optical attenuation change;
⑤ Start to stretch continuously until the OPGW1 optical cable is broken.
⑥ Artificially cut off 80% of the aluminum alloy monofilaments on the outer layer of the OPGW2 optical cable, i.e. 9 strands, at the same place, and then wrap the test pre-twisted wire repair strip P2 around the outer layer of the cable with the breakpoint as the center;
⑦ Repeat the above ②-⑤ steps.
⑧ Breaking force and optical test results
In the simulation test, the number of broken strands of the outer aluminum alloy monofilament of the OPGW optical cable is 80%. After repairing with a pre-twisted wire repair strip, the breaking force and optical test test results are carried out
Outer AA line
Residual RTS
Pre-twisted wire repair
Pre-twisted wire repair
Original
Optical cable code diameter
After 80% of the strands are broken
Proportion
Strips are broken after repair
Repair of the breakpoint position
RTS
Calculate residual RTS
Force test results
Proportion
74.0kN
75.7%
95.07kN
Inside the repair strip
97.2%
OPGW1
17.1 97.8kN
61.5kN
76.7%
78.60kN
Inside the repair strip
98.0%
OPGW2
15.0 80.2kN
The optical power meter displayed no significant change before and after the breaking force test, indicating that the light attenuation has not changed.
