Study on Nondestructive Testing Methods for Crimping Quality of Steel Cored Aluminum Strand

The crimping quality of steel cored aluminum strand for overhead transmission lines has a direct influence on the safe and stable operation of lines. The common crimping quality problem of splicing sleeve is analyzed in this paper. It is indicated that the core issues of crimping of steel cored aluminum strand is the inaccurate crimping positioning of the aluminum tube of splicing sleeve. At present, there is no effective and convenient nondestructive method to implement quality supervision during crimping process. Aiming at the above problem, magnetic detection can be used to indicate the relative position between the non-crimped area of steel and aluminum tubes since they have different magnetic properties. We propose to strengthen the crimping quality supervision of steel cored aluminum strand in order to ensure the safe operation of transmission lines.