Research on Physical Model and Criterion of Loose Strands in Tension Stringing Construction

In tension stringing construction, the conductor defects of loose strand often occur, which affects the construction quality and conductor life. There is no suitable method to express the physical state of such loose strand at present. Through the study of the loose strands section of the conductor, the physical model of the loose strands of the conductor is established, and the physical calculation formula of scattered strands and lantern included in loose strands defect is proposed, as well as the discrimination coefficient of the scattered strands k₁ and the lantern k₂ . 3D scanning technology of industrial CT was used to scan and model the loose strand samples of JL/G1A-630/45-45/7 and JL1/G2A-1250/100-84/19 ACSR obtained from the loose strand reproduction test of conductor. The CT scanning model is evenly intercepted to measure multiple sections, and the scattered strands coefficient and the lantern coefficient are calculated. The results show that: When k₁ and k₂ ≥ 1.2, the scattered strands and lantern defects of the conductor are more obvious, which can be used as a criterion.