1. Chemical corrosion of laying environment If the accumulated water in the cable trench or the directly buried soil contains corrosive components, such as sulfuric acid or nitric acid, the cable surface will be in contact with these corrosive substances for a long time, and severe chemical corrosion will occur. If the cable sheath is … Read more
Part 1:Relevant standards and specifications for cable selection 1. DL/T5044-2004 People’s Republic of China Electric Power Industry Standard 2. GB50217 Power Engineering Cable Design Code Part 2:Main technical requirements 1. Two-core cables should be used for the DC power supply loop, and single-core cables can be used when needed. 2. Polyvinyl chloride insulated cables are … Read more
In the actual parallel use of cables, there are more single-core cables in parallel. During the actual parallel use of single-core cables, due to the influence of the laying method, the actual current carrying capacity may not meet the actual load needs, and it may appear in actual use. Overload phenomenon. In fact, when 6 … Read more
1. Termite damage Termites are the enemy of underground power cables, especially in Southeast Asia and the hot and humid areas of southern my country, where termites often erode the plastic sheath of cables. When termites encounter a cable, in addition to biting, they also secrete formic acid, which severely corrodes the cable insulation and … Read more
The insulation resistance of directly buried power cables is reduced and the phenomenon of cable line failures often occurs, especially when the cable insulation is damp, it is easy to cause the insulation resistance of directly buried power cables to decrease and substandard 1. The cable raw materials are damp The raw materials used for … Read more
Carbon fiber endows its composite material with excellent performance due to its inherent characteristics. It has a series of high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and low thermal expansion coefficient. Excellent performance, which provides the possibility and necessity for its application in … Read more
In our lives, electrical fire accidents caused by short circuits and spontaneous combustion caused by the aging of cables frequently occur, and the losses caused are countless. With the continuous acceleration of domestic economic construction and the heating of urbanization speed, the number of various large-scale industrial facilities, high-rise commercial buildings, underground buildings and residential … Read more
The use of non-environmental protection cables is strictly prohibited in developed countries, and China also attaches great importance to this field. Relevant Chinese laws and regulations clearly require important buildings to prohibit the use of polyvinyl chloride wires and cables, and halogen-free and low-smoke cross-linked PVC wires and cables must be used to avoid a … Read more
The main technical indicators related to fire safety are the flame retardancy of CO2 cables, the density of smoke and the toxicity of the gas. American fire protection standards pay more attention to the first two issues, but Europe and the United States have completely different views on fire safety. The American traditional concept believes … Read more
As fire-resistant cables are now more and more widely used, many manufacturers are producing them, but often the quality cannot be guaranteed. Therefore, under normal circumstances, when companies develop fire-retardant cable products, they first try to manufacture a section of the product, send it to the relevant national inspection agency, and then start mass production … Read more