Failure problems of cold shrink cable accessories
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- Release time:2021-06-22
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[Summary]Generally, cold shrink cable accessories are most likely to fail in the middle connector and terminal head of the cable and their vicinity, especially the production requirements of the middle connector are higher, so the possibility of hidden dangers of accidents is relatively higher too. In addition, if the installation quality of cold shrink cable accessories is not qualified, it will cause the increase of cable failure rate that the cable is damaged by external machinery or long-term overload operation.
Failure problems of cold shrink cable accessories
[Summary]Generally, cold shrink cable accessories are most likely to fail in the middle connector and terminal head of the cable and their vicinity, especially the production requirements of the middle connector are higher, so the possibility of hidden dangers of accidents is relatively higher too. In addition, if the installation quality of cold shrink cable accessories is not qualified, it will cause the increase of cable failure rate that the cable is damaged by external machinery or long-term overload operation.
- Classification:Company News
- Author:
- Source:
- Release time:2021-06-22
- Visits:0
Generally, cold shrink cable accessories are most likely to fail in the middle connector and terminal head of the cable and their vicinity, especially the production requirements of the middle connector are higher, so the possibility of hidden dangers of accidents is relatively higher too. In addition, if the installation quality of cold shrink cable accessories is not qualified, it will cause the increase of cable failure rate that the cable is damaged by external machinery or long-term overload operation.
First, it is caused by the low quality of the intermediate connectors and terminal heads of the cold shrink products. If the creepage distance of the semi-conductive layer is insufficient during the production process, the shrinking of the cold shrink cable accessories will cause impurities and sweat inside. For this reason, the impurity in the cable will be released under the action of a strong electric field after the operation of the cable, resulting in discharge.
In addition, during the manufacturing process of cold shrink cable accessories, if the wire crimping quality is not good, it will cause excessive contact resistance of the connector and heat, or the phenomenon of insulation aging due to excessive shrinking, which will cause the insulation layer to age and be broken down.
Second is that the metal shield of cold shrink cable accessories is imperfectly grounded. In general cross-linked cables, there are two grounding points, and the grounding resistance value should be less than the specified value, so as to effectively protect the cable. If the grounding resistance value exceeds the standard in many cases, when the cables and connectors receive voltage, they will induce a better voltage, which will lead to the aging and breakdown of the insulation.
Third, because the installation quality of cold shrink cable accessories is not high, it mainly refers to the auxiliary point of sand or soft soil at the bottom of the cable trench during cable laying and installation. The cable accessories are squeezed by stones or heavy objects in the cable trench, causing mechanical trauma.
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