Selection of low-voltage insulated overhead bundled cables

At present, the low voltage power network reconstruction project has been started, the low-voltage insulation aerial bundled cable can choose five kinds of cable material, this is a very good choice, different opinion. Given this situation, from the steady increase in the power grid construction project quality, can withstand the test of history principle, by a long time research experience is summed up the comprehensive technical and economical analysis is proposed in the low-voltage insulation aerial bundled cable, polyethylene if cross-linking is not such as the choice of excellent weather ability polyvinyl chloride (PVC) conclusion.

Introduction

1kV and the following three types of cable materials for the use of insulation aerial bundled cable: Hou type of PVC, polyethylene resistance type, cross-linked polyethylene. What kind of cable is appropriate, this is a problem worthy of study in the power grid transformation and construction. Three cable materials, if only from the technical performance, the best is the cross-linked polyethylene, followed by the weathering type PVC is a polyethylene. Due to the high price of cross-linked polyethylene, it can only be used on special occasions, so the most commonly used occasions should be the preferred weather type PVC.

PVC insulation

Crosslinked polyethylene has good resistance to atmospheric aging. This is due to the molecular structure of its decision. Due to the cross-linking of polyethylene linear state by bypassing crosslinking agent into the network structure, polymer chains closely contact together, enhance the ability to resist external damage, and polish shielding agent and antioxidant effects, we no longer need to worry about XLPE resistance to atmospheric aging ability.

Some people think that the use of high-pressure-linked polyethylene cable, then the best use of polyethylene, polyethylene, is not a bad idea. Due to the use of high voltage cable, which is the essential difference between sports and sports. In addition to the environmental stress cracking problem, there are still problems such as low mechanical strength, low softening temperature, easy deformation, and poor flame retardant properties.

Conclusions

(1) low-voltage PVC insulated aerial bundled cable through theoretical analysis of 30 years of long-term laying practice proves, resistance to ozone aging properties, high mechanical strength, resistance to extension, wear resistance, flame resistance good advantage, the insulating ability, and water resistance, can meet the requirements of low voltage power network. Therefore, it should be the first choice for a low voltage power network.

(2) low voltage cross-linked polyethylene insulated aerial bundled cable has excellent insulation performance, mechanical properties, and heat resistance. However, due to the high price, it is recommended that in the current economic conditions, the special requirements of the occasion are more appropriate.