A kind of construction technology of expanding wire

Abstract

The invention relates to a construction process of an enlarged diameter wire, which comprises the following steps: (1) stake out the expanded diameter wire, including overhead bus bar stakeout and equipment lead wire stakeout; (2) open the expanded diameter wire; (3) open the expanded diameter wire Insert into the hydraulic pipe; (4) crimp the expanded diameter wire by reverse pressure method; (5) lift and install the expanded diameter wire after crimping. Compared with the prior art, the method of the present invention is accurate in lofting, the cross-section after cutting is flat and perpendicular to the axis of the wire strands, the end of the wire has no burr, no loose strands, and no deformation; after crimping, the wire near the crimping nozzle has no bulge and looseness Strands, crimping pipe without bending phenomenon, the pipe wall after hydraulic pressure is smooth and free of cracks, there is no "bubble" phenomenon on the surface of the expanded diameter wire after crimping, and there is no bending phenomenon during hoisting, which fully meets the requirements of standardized construction and can be used for Guide the standardized construction of 1600 and above expanded diameter conductors in large-capacity lines of 500kV AC substations.

Description

technical field [0001] The invention relates to a construction technology for power lines for power transmission and transformation, in particular to a construction technology for diameter-expanding wires. Background technique [0002] In the large-capacity (carrying capacity > 4000A) lines of the 500kV AC substation, 1600 expanded-diameter conductors are used instead of ordinary conductors to reduce project investment. The expanded diameter wire effectively overcomes the corona phenomenon generated by ordinary wires during operation, and greatly improves the use efficiency of the wire. However, there is no steel core in the expanded diameter wire, and the wire is soft and prone to bending deformation during transportation and installation. The process control of the construction process brings great difficulties: during the construction process of power transmission and transformation power lines, the expanded wires are prone to scratches, such as friction between layers...

AI Technical Summary

Problems solved by technology

The expanded diameter wire effectively overcomes the corona phenomenon generated by ordinary wires during operation, and greatly improves the use efficiency of the wire. However, there is no steel core in the expanded diameter wire, and the wire is soft and prone to bending deformation during transportation and installation. The process control of the construction process brings great difficulties: during the construction process of power transmission and transformation power lines, the expanded wires are prone to scratches, such as the friction between layers and turns of the wires, the wires are scratched, the outer layer wires are injured, etc., affecting If the performance of the expanded diameter wire is compromised, it will even bring safety hazards in the future use process. Moreover, a little carelessness in the on-site crimping process of the expanded diameter wire will cause the wire to be stressed and held back, and in severe cases, the wire will be scattered. shares, affecting subsequent engineering construction

In addition, the expanded wire is prone to bending deformation due to uneven local force, which affects the overall effect after installation

As a new product, 1600 expanded-diameter wire, due to its large diameter and large bending radius, and its special structure, the use of conventional flexible busbar operation instructions and construction process specifications can no longer meet the construction requirements