What type of component is used to grip the aluminum sleeve in compression sleeves for ACSR conductors?

In compression sleeves for ACSR (Aluminum Conductor Steel Reinforced) conductors, an internal unit is utilized to grip the aluminum sleeve. This internal component plays a crucial role in ensuring a secure and effective connection between the aluminum conductor and the sleeve. The gripping action provided by the internal unit is essential for maintaining the integrity and reliability of the electrical connection, especially under load and environmental conditions.

The design of the internal unit allows it to exert pressure inwardly against the sleeve when the connection is formed, promoting a strong mechanical bond that enhances conductivity and reduces potential points of failure. This is particularly important for ACSR conductors, which have both aluminum and steel components; ensuring a tight grip helps accommodate the differences in expansion rates between these materials.

In contrast, the other options imply components that do not effectively serve this purpose. An external unit would not provide the necessary gripping force needed inside the sleeve to secure the conductor effectively. A support unit might refer to additional structural elements but does not directly address the gripping mechanism for the sleeve. An adhesive unit, while useful in certain applications, does not fulfill the mechanical gripping requirement necessary for the electrical properties and integrity of the joint in this context.