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2 large-section aluminum twisted line of steel core, survival rate of armor clamp grip, accumulated tensile strength, and steel core lap joint Abstract. ±1100kV Ultra-high Voltage DC Engineering will adopt JL1X/G2A-1520/125-481 large-section aluminum twisted line of steel core, 1520 mm 2 large-section aluminum twisted line of steel core is of four-layer structure and has the same aluminum strand layers of 900 mm 2 and 1000 mm 2 large-section aluminum twisted lines of steel core applied in the previous engineering, but the armor clamp grip cannot be easily guaranteed due to its large aluminum section. By virtue of design optimization, trial-manufacture and test & research of strain clamp and connecting tube, the grip of researched & developed supporting strain clamp and connecting tube of 1520mm 2 aluminum twisted line of steel core in this Paper meets 95%RTS.

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The mechanical properties and low-temperature resistance of the 42CrMo steels utilized in electric power fittings after different heat treatments were comparatively investigated. Results indicated that a tempered sorbite with refined structure was obtained in the steels and the mechanical properties and low-temperature resistance were consequently improved after quenching + quenching + tempering and cyclic quenching and tempering, especially after the latter. The product of strength and elongation reached up to 25725 MPa% and the impact energy at -50 °C increased to 48 J after cyclic quenching and tempering as compared to 16562 MPa% and 19 J after conventional quenching and tempering. The 42CrMo steel after cyclic quenching and tempering can be considered as a suitable candidate for connection fittings in electric power transmission line.