江苏春晨电缆有限公司：https://www.ybzhan.cn/st82365/
Key problems of prefabricated branch cable for mine communication cable
Solid insulation filled cables are suitable for pipeline laying in coal mine, which is mainly used for pipeline laying. In the cable core and the inner and outer surface of the shield layer is filled with oil paste or cast to prevent water intrusion in the coal mine. The mechanical and electrical properties of the communication cable used in the coal mine are kept unchanged under the 30~C 60~C environment. For roadway and inclined roadway and electrical chamber as the communication lines and for entry, as the signal transmission shaft or shaft.
A good quality of prefabricated branch cable, mine cable must be excellent performance for domestic products, mechanical and physical properties of the conductor properties, insulation performance, materials shall comply with the GB12706-91 standard for cable performance is the basic index of prefabricated branch cable products. Prefabricated branch cable factory in accordance with user requirements of the cable is the main and branch cable type, specification, section, length and branch position and other indicators, in the factory and a series of special production equipment, on the production line the finished cable with branch.
FDES风能电缆，分支联接体的性能至关重要，这是预制分支电缆的关键性能。分支联接体把主电缆与分支电缆的导体连为一体，并作绝缘防潮处理。FDES风能电缆，从外观上看，无法知道内部接头质量，有两项重要的试验能够检测接头性能，即接触电阻和热循环试验。
The performance of the branch connection is very important, which is the key performance of the prefabricated branch cable. The branch connecting body is connected with the conductor of the branch cable into a whole, and is used for insulation and moisture proof treatment. From the appearance, can not know the quality of internal joints, there are two important tests to detect the performance of the joint, that is, contact resistance and thermal cycling test.
The ratio of R1/R2 reference resistance branch cable contact resistance requirements and the length (R1: R2: joint contact resistance, branch cable reference resistor) is less than or equal to 1.2; the thermal cycling test, when the main cable and the branch cable respectively through the rated current, heating for 5 hours, 3 hours of natural cooling for a cycle, a total of 125 a cycle, after twenty-fifth cycles, the surface temperature of the connecting body does not exceed 75 degrees, after each cycle, joint surface temperature of 8 DEG C higher than the value not the surface temperature of twenty-fifth cycles.
Resistance, because of the blocking effect of the material on the current, so that the resistance of the material under the action. Resistance will lead to changes in the flow of electrons, the smaller the resistance, the greater the flow of electrons, and vice versa. A substance with no resistance or resistance is very small, it is called an electric conductor. A substance that cannot form a current transmission is called an electric insulator.
YFD series prefabricated branch cable for mine cable by the State Quality Supervision, inspection and testing center, the contact resistance of R1/R2 was 0.7, twenty-fifth times thermal cycling connecting body surface temperature of 43 DEG C less than 75 degrees Celsius, the highest temperature in 26~125: 47 degrees less than 51 degrees celsius.
A cycle of work that is transferred from one part to another. In the reactor, the heat transfer loop is usually separated from the power to prevent the liquid from flowing into the heat transfer loop and then pollute the power circuit.
To determine the performance of key branches of the connecting body is branch of the connecting body material and process for the majority of designers, should take care of prefabricated branch cable cable joint quality, material selection and production process, tooling.
