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Cable sheaths crack problems

Information Source:Henan Huadong Cable Co., Ltd Release date:2014-02-27

Cable sheath crack is product quality accident, the normal product without cracking at the specified temperature range, at the same time, according to the provisions of the bending radius of cable will not cause cracking. The mid 80's in last century, a large number of cable sheath crack Guangdong Dayawan nuclear power station imported cable, after investigation and sampling analysis, find out the following:

(1) the sampling found sheath are thermoplastic cracking of low smoke halogen-free flame retardant materials, sampling found no cross-linking low smoke halogen-free flame retardant material cracking.
(2) the raw material test report provided abroad, all properties within the allowable range.
(3) foreign did not provide sheath extrusion conditions, process problems cannot understand.
(4) imported from cable stripping sheath, cut into pieces, with double roller thermoplastic exhibition extruded sheet, then under standard conditions molded into pieces, and then cut a dumbbell piece of test, the test data are within the allowable range.
(5) imported from cable sheath cut directly dumbbell test, the elongation at break is much lower than the acceptable index.
(6) the minimum bending radius of cable into a ring is fixed, for thermal cycling test, a plurality of the sample into the small cracks appeared in third cycles after the sheath, the crack depth and length soon spread, finally with the cable sheath crack completely similar. The above situation, cracking reasons can be summarized in two points, one is the raw material inspection is qualified, but the performance level is not high; the second is sheathed extrusion process does not meet the material requirements, the existence of hidden dangers sheath, after temperature cycle changes after cracking.

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