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Construction technology of expanded-diameter conductors

A technology of expanding conductors and construction technology, applied in the direction of overhead lines/cable equipment, etc., can solve problems such as difficulty, impact on engineering construction, safety hazards, etc., achieve accurate lofting, improve work efficiency, and achieve the effect of environmental protection

Active Publication Date: 2014-01-01
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with specific embodiments.

[0021] This embodiment takes the construction process of 1600 diameter expanded wires in Nanhui 500kV substation as an example, including the following steps:

[0022] (1) Stakeout for expanded wires, including overhead busbar stakeout and equipment lead wire stakeout;

[0023] The 1600-diameter expanded wire overhead busbar stakeout is the same as the conventional wire method. First, use a steel tape measure to measure the distance L between the hanging points of the frame, and then calculate the length M of the wire: M=L+8F 2 / 3L+L1-L2-L3, where, F is the sag, L1 is the length of the wire that penetrates the crimping tube, L2 is the length of the insulator string with metal fittings, and L3 is the elongation of the crimping tube on both sides.

[0024] The specific method of setting out the equipment leads is as follows:

[0025] 1) Stake out from the upper busbar to ...

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Abstract

The invention relates to a construction technology of expanded-diameter conductors. The construction technology of the expanded-diameter conductors comprises the following steps of (1) carrying out lofting on the expanded-diameter conductors, wherein the lofting carried out on the expanded-diameter conductors comprises suspended bus lofting and device lead lofting; (2) splitting the expanded-diameter conductors; (3) inserting the expanded-diameter conductors into a hydraulic pipe; (4) carrying out pressing connection on the expanded-diameter conductors through the reverse-pressing method; (5) carrying out lifting and installation on the expanded-diameter conductors processed through pressing connection. Compared with the prior art, the construction technology of the expanded-diameter conductors is accurate in lofting, the fracture surface of each expanded-diameter conductor is flat after cutting is carried out, and is perpendicular to the axis of each cable strand, and the ends of each expanded-diameter conductor are free of burrs, free of strand loosening and free of deformation; after pressing connection is carried out, the portion, close to a pressing connection tube opening, of each expanded-diameter conductor is free of swells and loosened strands, the phenomenon of a bent pressing connection tube does not exist, the tube wall of the pressing connection tube after hydraulic pressure processing is smooth, and free of cracks, the surface of each expanded-diameter conductor after pressing connection processing is free of bulged strands, the meander phenomenon does not exist when hoisting is carried out, the requirement for standardized construction is completely met, and the construction technology of the expanded-diameter conductors can be used for directing standardized construction of expanded-diameter conductors, with the diameters of 1600 or more, in high-capacity circuits of 500kV alternating-current transformer 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/02
Inventor 徐奋濮强虞佳旻徐惠新郁冬王晓锋徐勇
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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