Tianlian local communication cable HYA23500 * 2 * 0.7 has sufficient supply

Description :

　　4. Insulation material: high-density polyethylene; 1. Insulated single wire: Continuously extruding insulation material on the wire, using the specified 10 standard chromatograms for identification, and ensuring the electrical performance of the cable;

　　2. Insulated wire group: Twist a single insulated wire into four wire groups at different pitches to minimize crosstalk to the maximum extent possible, and use a specified chromatographic combination to identify wire pairs;

　　3. Cable core structure: Insulated single wires are twisted into pairs and then twisted into cable cores using the same core or unit type. Different cable ties are used for each unit to facilitate construction, maintenance, and identification.

　　4. Cable core tape: The cable core is wrapped with non hygroscopic and non oil absorbing insulation tape;

　　5. Cable shielding: Wrap double-sided plastic coated aluminum tape with rolled (or non rolled) stripes longitudinally outside the cable core wrapping tape, and overlap and bond both sides;

　　6. The armor layer adopts double-layer wrapped steel tape armor.

　　Tianlian local communication cable HYA23500 * 2 * 0.7 has sufficient supply

　　Complete knowledge of wires and cables 1. Example: Main cable 70mm2, calculated current 220A, voltage drop V0=0.36X10-3V/A.m

　　2. Three phase allowable length L=19/√ 3x200x0.36x10-3=130m

　　3. The concept of wires and cables and the distinction between wires and cables: Regarding the daily maintenance and management of communication fiber optic cable lines, relevant reference materials 1. Prevention of communication fiber optic cable line failures. In order to reduce the occurrence of communication fiber optic cable line failures and do a good job in communication fiber optic cable line maintenance, it is necessary to strictly implement the policy of "prevention first, combination of prevention and control", carefully maintain, scientifically manage, keep equipment intact and in good condition, maintain good transmission quality, prevent line failures and eliminate them as soon as possible

　　2. Preventive maintenance is carried out according to predetermined cycles and prescribed standards For the daily maintenance of communication optical cable lines, each person can be responsible for managing 40-50 kilometers of optical cable lines, mainly responsible for guarding the identification of the lines, external disturbances, etc

　　3. Controlled maintenance mainly utilizes detection equipment and manual testing data to compare and predict the changes in fiber optic curves, in order to avoid the occurrence of faults

　　4. Corrective maintenance mainly involves correcting and repairing faults, which is carried out after a fault occurs, with the aim of restoring the equipment to its original performance This task will be completed by the emergency repair team Corrective maintenance requires a strong emphasis on not only relying on OTDR test curves and data when a fault occurs, but mainly on on-site investigation. Investigation and visits should be conducted to understand the terrain, landforms, engineering construction, and changes in the surrounding environment of the optical cable line, as well as to speed up the handling of the fault

　　5. For the fault testing of communication optical cables, the staff should have a clear understanding of the transmission performance of the communication optical cable lines in order to timely detect and handle abnormalities. Regular and irregular testing should be conducted on the optical fibers, with the main fiber being tested once a year. Irregular testing may be determined as needed. When a suspicious channel is found, fiber adjustment testing can be conducted at any time The testing content mainly includes: the backscatter signal curve of the fiber optic line and the quality inspection of the connector The testing method generally adopts the backward method, and the OTDR instrument can simultaneously complete the above testing content To check the attenuation of the fiber optic line, compare its test results with the completion test records and previous periodic test records of the line The backscatter signal curve of the fiber optic line is mainly observed for any abnormalities in the curve, such as large step losses outside the joint and excessive joint losses

　　Tianlian local communication cable HYA23500 * 2 * 0.7 has sufficient supply

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