Test method used for transmission line ice coating disconnection

Abstract

The invention provides a test method used for transmission line ice coating disconnection. In the method, the influences of the factors such as the wire model, the ice coating thickness and wire initial tension and the like are comprehensively considered, and the method has better adaptability and higher accuracy. The test method provided by the invention comprises the following steps of constructing a serial three-gear four-rod three-line model; simulating wire ice coating by using a method of a heavy steel wire rope adopting binding and ice coating and the like; installing a disconnection trip mechanism at a side gear midspan position; testing a transverse displacement decrement curve and a non-disconnection gear disconnection tension travel time curve of an intermediate gear midspan point in each working condition on the basis that test working conditions are designed in accordance with different wire models and ice coating thicknesses; and determining the ice coating wire damping ratio and a wire tension dynamic shock factor to finally provide a basis for the tower disconnection load value of an ice coating zone. The test method comprises the following steps: designing a disconnection test line section, calculating the weight of ice coating, carrying out damping identification on the ice coating wire and testing and analyzing the disconnection tension. The method provided by the invention has the advantages of simple theory, reliable computational result, and provides a basis for the construction of a transmission line.

Description

technical field [0001] The invention belongs to the field of wire breakage load testing in power transmission line tower load testing, and specifically relates to a power transmission line ice-coated wire breakage test method. Background technique [0002] Meteorological disasters such as icing, galloping, and strong winds may cause disconnection of transmission line conductors or ground wires. Overhead conductors and towers are easily covered with ice in winter. Severe icing and conductor galloping caused by icing are the main reasons for disconnection of high-voltage transmission lines and collapse of towers. Icing thickness is an important parameter that must be carefully studied and calculated when designing overhead high-voltage transmission lines. Calculating the stress of overhead high-voltage conductors at different ice thicknesses is of great significance for ensuring the safe operation of transmission lines. [0003] In many areas of our country, there have been a...

AI Technical Summary

Problems solved by technology

In addition, the damping has a great influence on the attenuation process of the broken line response. In the previous experimental research, the damping of the tower line system was not tested. Most of the numerical analysis used an assumed value based on experience, which affected the accuracy of the dynamic simulation analysis results of the broken line. precision

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