Deicing method based on icing rolling on electric transmission line
A technology of transmission lines and pulleys, applied in the direction of overhead lines/cable equipment, etc., can solve problems such as unbalanced force of towers, negative effects of sequential de-icing, and tower collapse failures
Active Publication Date: 2013-12-11
STATE GRID CORP OF CHINA +2
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Problems solved by technology
When the icing is serious, the unbalanced force on both sides of the tower will exceed its design strength, resulting in tower failure
When using the pulley rolling and shoveling method for sequential deicing, even if the transmission line is not seriously icing, there may be an unbalanced force on the tower that exceeds its design strength, which will lead to negative effects of sequential deicing
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[0044] A non-limiting embodiment is given below in conjunction with the accompanying drawings to further illustrate the invention.
[0045]In the project, the pulley shoveling method is currently the only feasible mechanical deicing method. The ground personnel remotely operate the movable device on the line, and scrape off the ice coating on the line through the steel blade on the device. However, because the pulley shoveling method is used to remove When ice is present, the lines of each gear cannot be deiced at the same time, and there will be a large unbalanced tension difference between the gears of consecutive gears. When the unbalanced tension difference is too large to reach the design limit of the tower, the tower will collapse and twist , not only cannot deicing effectively, but also cause secondary accidents. Therefore, the inventor proposes a corresponding deicing method aiming at the feature that each line can only be deiced once in the pulley scraping method.
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The invention discloses a deicing method based on an electric transmission line cable deicing robot. During deicing, the deicing robot moves on an electric transmission line cable so as to remove ice. The deicing method comprises the following steps of calculating the horizontal tension of each grade of cable on the electric transmission line so as to obtain the horizontal tension value of each grade during icing; comparing the horizontal tension values of all the grades so as to determine the grade with the maximum horizontal tension value, manually pulling a pulley to the cable at the grade with the maximum horizontal tension value, and stressing the pulley so as to enable a blade on the pulley to clear away the ice on the grade with the maximum tension value; determining the grade with the maximum tension value among the rest of grades by adopting a bubbling method, manually pulling the pulley to the cable at the grade with the maximum horizontal tension value among the rest of grades, stressing the pulley so as to clear way the ice on the grade with the maximum tension value till the ice on each grade of cable is completely removed. The deicing method is safe and can be used for reducing the unbalance tensile force of towers in a deicing process.
Description
technical field [0001] The invention relates to a deicing method, in particular to a deicing method suitable for rolling and scraping pulleys of power transmission lines. Background technique [0002] Ice and snow on transmission lines often cause accidents such as line tripping, disconnection, pole down, and insulator flashover. In 2008, extreme ice and snow disasters occurred in southern my country, which caused the outage of more than 36,000 transmission lines of 10kV and above and more than 2,000 substations of 35kV and above, which caused great losses to my country's power grid and national economy. [0003] Since the 1950s, countries around the world have continued to study icing on transmission lines, exploring the mechanism of icing, the conditions for forming icing, and the defense methods for icing disasters. The current deicing methods are mainly divided into thermal deicing methods and mechanical deicing methods. Compared with thermal deicing methods, mechanical...
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Inventor 刘昌盛刘俊刘和志刘钊魏徐谢云云张莲花殷明慧
Owner STATE GRID CORP OF CHINA