Shielded cable

The shielded cable is a transmission line wrapped with metal mesh braid. Shielded cable is a transmission line that uses metal mesh braid to wrap the signal line. The braid is generally red copper or tinned copper. In the shielded signal cable, the shielding layer can serve as the return path of the signal, or it can only serve as the shielding layer. High voltage power cables with solid insulation layer are shielded to protect cable insulation layer, personnel and equipment. Coaxial cable is a shielded transmission line. The wire and cable industry is the second largest industry in China after the automobile industry, with product variety satisfaction rate and domestic market share exceeding 90%. In the world, China's total output value of wires and cables has surpassed that of the United States, becoming the world's largest producer of wires and cables. With the rapid development of China's wire and cable industry, the number of new enterprises has been rising, and the overall technical level of the industry has been greatly improved.

Use characteristics of shielded cable

1. Rated voltage U0/U 3.6/6KV; 2. The long-term working temperature of cable conductor is 90 ° C; 3. The minimum bending radius of the cable is 6 times of the cable diameter; 4. The cable shall not be exposed to the sun for a long time; 5. The bottom core of the cable must be well grounded.

Main technical performance of shielded cable

1. The finished cable shall withstand the power frequency AC voltage test with the power core of 11.0kv5min; 2. Transition resistance: the transition resistance of the shielding layer or monitoring layer should not be greater than 3k Ω. 3. Combustion test: the cable shall undergo the combustion test specified in GB12666.2 DZ --- 1; 4. Partial discharge test: 1.5U0 discharge capacity is not greater than 20PC; 5. Dielectric loss angle tangent test: not greater than 0.035 at U0; 6. Impulse voltage test: after 10 times of positive and negative polarity at 95 ° C and 60KV respectively, apply the processing frequency 11KV voltage to the cable pattern for 15min; 7. The cable shall be able to withstand 3U, 4h power frequency voltage test.