Lanzhou telephone cable, coal mine underground communication cable, 2 * 2 * 7/0.37

Description :

　　Communication cables are cables used to transmit telephone, telegraph, fax documents, television and radio programs, data, and other electrical signals. It is made up of twisted wires that are mutually insulated from each other. Compared with overhead open lines, communication cables have the advantages of large communication capacity, high transmission stability, good confidentiality, and less susceptibility to natural conditions and external interference.

　　Mining cable is the abbreviation for coal mine cable. Mining cables are all flame-retardant cables and should be issued with a mining product safety mark certificate by the National Mining Product Safety Mark Center. U-shaped (M-type) rubber sheathed cable for coal mines.

　　Development status of mining cables:

　　1. In recent years, there has been a lack of emphasis on adjusting the product structure in the wire and cable industry due to low-level repetitive construction. The contradictions in product structure are still prominent, and high-level products cannot meet the needs. For example, in terms of categories, China's bare wire production accounts for nearly 1/5, while developed countries only account for 1/10. In bare power lines, overhead lines and ordinary steel cored aluminum stranded wires account for the vast majority;

　　2. There are over 700 loss making enterprises in the industry with low economic benefits, accounting for more than a quarter of the total losses. The industry's sales revenue profit and tax rate was 11.7% in 1991 and decreased to 5% in 1995. Due to the continuous decline in profitability, an increase in loss making enterprises, and a general shortage of funds within the industry, the average asset liability ratio is as high as 70%;

　　3. The scale growth is too rapid, and the overall capacity of the wire and cable industry is more than twice the demand. The predicted demand for various product categories in 2000 is less than the production capacity.

　　Selection of Mining Cables:

　　In the mine power supply system, high-voltage power supply lines generally use armored cables, which have a much lower failure rate compared to low-voltage power supply. The power supply in mining areas is a weak link in the power supply system, and the working environment is poor. Therefore, how to choose the type and cross-section of cables is related to the safety of power supply operation. The following introduces the selection of cables and the method of selecting cable cross-sections.

　　Characteristics of using mining cables:

　　1. The rated voltage U0/U of the power frequency is 380/660V, 660/1140V, 1.9/3.3kv, 3.6/6kv, 6/10KV, 8.7/10KV, 300/500V;

　　2. The high allowable working temperature for cable conductors is 65 ℃ and 90 ℃;

　　3. The cable allows a low working environment temperature of -35 ℃;

　　4. Cable bending radius: not greater than 6 times the outer diameter of the cable.

　　Tianjin Cable Factory Branch, with a pragmatic work style and an ideal belief in innovative development, has stood firm in the tide of the business world, growing from scratch, from small to large, step by step, and thriving in the baptism and tempering of the market wind and rain.

AfterSalesService :

• Underground mining communication cable