The American mature aluminum alloy cable has been promoted and applied in China for nearly eight years, and it has been basically accepted by all parties in the field of cable application. The aluminum alloy cable industry and market have formed an upsurge, and various types of aluminum alloy cable products are constantly flocking to the market. However, the most critical connection technology and ancillary product issues related to the safety of aluminum alloy cable applications that have been deliberately avoided in the past eight years have never attracted the real attention of the industry and users. As we all know, the safety hazards of cables in applications are basically connected.
In 1968, the United States invented aluminum alloy cable technology, setting off a revolution in conductor materials. Aiming at the application of aaac conductor cable products, aluminum alloy cable manufacturers led by Southern Cable actively cooperated with UL and other organizations to carry out research on connection technologies and related connectors suitable for aluminum alloy conductors and cable products, and achieved technological breakthroughs and formulated Corresponding standards. The combination of aluminum alloy cables and supporting connection technology and connection products has jointly created a successful history of product application in North America and other countries that have used aluminum alloy cables for nearly 50 years without a single safety accident.
In 2006 and 2007, two American companies brought American mature aluminum alloy cable technology and products into China, and created and promoted China's aluminum alloy cable business and development. However, due to different national conditions, cable connections are different in installation and connection methods, and manufacturing standards are different. Foreign connection technologies and connectors cannot be used in China. The current domestic situation is that because there was no aluminum alloy cable technology and products before, of course there was no corresponding connection technology and supporting products. Due to various factors, aluminum alloy cable manufacturers themselves are unable to carry out related research on the connection technology and connectors of aluminum alloy cables. As a result, aluminum alloy cables are promoted and applied in the country in the early stage. Because there is no other solution, they know that they can I can’t help but use the copper-aluminum transition terminal originally used for aluminum cables as the connector, which is a wrong connection solution for the connection of aluminum alloy cables. From then on, the application of domestic aluminum alloy cables has been extended to cable connections. This kind of unscientific and incorrect wrong connection solution leaves a safety hazard in the price of aac conductor.
As for the current copper-aluminum transition terminals used in the application of aluminum alloy cables, they were originally used for aluminum cable connection. The connection size of the terminal cannot be safely matched with the size of the terminal equipment. It often happens that the terminal contact surface is directly ground during construction to reduce terminal contact. Face size to adapt to the harsh conditions of connection needs. Grinding the contact surface of the terminal and reducing the size of the contact surface of the terminal will directly destroy the mechanical performance of the terminal, and cause insufficient electrical performance and current carrying capacity of the terminal contact surface, overload and heat generation of the connection part, directly causing fatal safety hazards. Furthermore, due to the different production processes of aluminum cables and aluminum alloy cables, the inner diameter of the copper-aluminum transition terminals used for aluminum cables does not match the outer diameter of the aluminum alloy cable conductors, requiring special crimping tools and strict specification construction. However, it is difficult to ensure the standardized construction of the connection between the aluminum alloy cable and the terminal in the installation and construction of the aluminum alloy cable in China, which causes great hidden dangers in the acsr conductor quality of the connection between the aluminum alloy cable and the terminal.