A design method of transmission line tower after canceling the ground wire

Abstract

The invention discloses a design method for an iron tower of a transmission line after canceling the ground wire, comprising the following steps: S1, cancel the ground wire and the ground wire support, and obtain relevant parameters; S2, calculate the load and resistance of the iron tower before and after the ground wire is canceled , establish a simulation model; S3, simulate and calculate the tower material stress of the tower before and after the cancellation of the ground wire, the maximum deformation of the tower head, and the pressure on the bottom of the foundation; S4, calculate the reliability index of the tower after the cancellation of the ground wire; S5, compare the cancellation of the ground wire The internal stress distribution of the front and rear towers, the maximum deformation of the tower, the pressure on the bottom of the foundation, and the reliability index; S6. According to the comparison result, reduce a certain percentage to obtain the internal stress distribution of the tower after the ground wire is removed, the maximum deformation of the tower, and the pressure on the bottom of the foundation less than The invention solves the problem that the original tower design method is not suitable for the tower design after the ground wire is canceled, which is equal to the maximum reduction value of the value before the ground wire is cancelled and the reliability index of the tower is not less than 4.2 and the corresponding tower structure parameters.

Description

technical field [0001] The invention relates to the technical field of transmission lines, in particular to a design method of a transmission line tower after canceling the ground wire. Background technique [0002] With the rapid development of my country's power grid construction, due to the long transmission distance and wide coverage, the transmission line often needs to pass through some alpine and cold mountainous areas with complex terrain and repeated ice, and the ice is seriously covered in winter. Compared with the transmission wire, the ground wire has no current Joule heating effect and is located above the wire, and its icing is more serious than that of the wire. Different from the ice melting of the transmission wire, the ground wire ice melting needs to be insulated, which requires a large amount of reconstruction work, high cost investment, and extremely difficult on-site implementation. Therefore, the cancellation of the ground wire of the transmission lin...

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Problems solved by technology

[0003] After the ground wire of the transmission line is canceled, the ground wire support of the transmission tower can also be canceled, but at this time the structure of the entire transmission line tower line changes, especially the stress, deformation and foundation pressure of the transmission tower under ice-covered conditions will also occur. The original transmission line tower design method can no longer be applied to the tower and foundation design after the ground wire is canceled. If the tower design simply cancels the ground wire support, the transmission tower and foundation dimensions still refer to the ground wire. Design standard - "Technical Regulations on Design of Tower Structures for Overhead Power Transmission Lines" (DL / T 5154-2012), which increases the construction cost and reduces the economy of power transmission lines without ground wires

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