Precautions for cable laying 0.6/1kv copper clad aluminum conductor polyethylene insulated power cable When laying the cable, the temperature shall not be lower than 0 ℃. The bending radius of laying: 1) single core cable without armor shall not be less than 20 times of the outer diameter of the cable, and that with armor shall not be less than 15 times of the outer diameter of the cable. 2) The non armored multi-core cable shall not be less than 15 times of the outer diameter of the cable, and the armored multi-core cable shall not be less than 12 times of the outer diameter of the cable. After the cable is laid, it shall undergo DC withstand voltage test for 15 minutes with test voltage of 4U. Laying in air When the single core cable is laid in parallel, the center distance is two times of the cable diameter of 185 m2 and below, and 90mm for 240 m2 and above. Ambient temperature: 40 ℃. Maximum allowable temperature of conductive core: 70 ℃. Correction factor of download flow at different ambient temperatures
Directly buried laying When the single core cable is laid without contact, the center distance is twice of the cable diameter. Ambient temperature: 25 ℃. Maximum allowable temperature of conductive core: 70 ℃. Soil thermal resistance coefficient: 1.0 ℃ · M / W Direct burial depth: 0.7m Correction factor of download flow at different ambient temperatures
Matters needing attention in selection of copper clad cable When purchasing this product, we must fully understand the current carrying capacity and relevant data corresponding to the square of the cable section. The data corresponding to the square of the original copper cable should not be completely followed to avoid burnout caused by overload. It is necessary to know the power and rated current of the load before use. In the selection of cables, in order to adopt the international advanced concept, polyethylene sheath material is recommended. All physical and electrical performance indexes are better than PVC (except for flame retardant, halogen-free and low smoke). Single core cable is recommended for the multi-core cable with an area of more than 70 m m2, so as to improve the current carrying capacity of the cable and reduce the AC resistance of the cable at power frequency. When purchasing this cable, it is recommended to select the conductor section square which is one grade larger than that of copper cable. The square of nominal section of copper-clad aluminum conductor cable refers to the square of section of original copper cable, and the selection of copper terminal is the same as that of original copper cable. As the copper-clad aluminum conductor is relatively soft, it is recommended to select compact terminal. Structure size of terminal block Copper terminal must be used for wiring, aluminum terminal of aluminum and copper transition terminal shall not be used; sharp tools shall not be used as far as possible to prevent damage to copper layer on conductor surface when installing twist ring on load equipment, and it shall not be repeated for more than three times continuously when installing twist ring, so as to avoid breakage of single conductor wire. After crimping the copper terminal and conductor, the most standard method is to use tin for welding (pouring tin) to ensure that the contact between the conductor and the terminal is close and firm. When the non sealed terminal is used, the end of the terminal should also be sealed with solder. When it is used for the intermediate connection of conductor, copper connecting pipe must be used. After crimping, both ends are sealed and welded with solder (tin pouring). Packaging, transportation and storage The packaging of finished cable shall comply with the relevant provisions of JB / t8137-1999 wire and cable delivery reel. During transportation, it is strictly forbidden to collide with each other and cause mechanical damage. Pay attention to the reliable sealing of cable ends during storage, and the cable reel shall not be placed horizontally during transportation and storage. Prevent moisture from entering the cable. Prevent high temperature and sunlight exposure. Each coil or reel of cable shall be attached with product certificate. Each coil or reel of cable shall be wound neatly and packed properly. Ordering instructions The model, rated voltage, specification and flame retardant grade of the cable shall be indicated when ordering. Commitment and service Commitment and service Our company will focus on pre-sale and in-sale services, provide technical consultation and tracking services for customers, and extend the product warranty period to 3-5 years. Our company has prepared a complete product enterprise standard, and put it on record in the local Technical Supervision Bureau. Ensure that all technical indexes of new products meet the requirements of national standards and enterprise standards. Under the condition that the DC resistance of conductor is the same as that of copper conductor, the technical indexes such as cable line loss, current carrying capacity, AC impedance, temperature rise and high-order harmonics are better than those of copper conductor cable, and the solderability and corrosion resistance are the same as those of copper conductor cable. Attachment: reference table for structural dimensions of terminals |
