Method for calculating thickness and weight of ice coating on overhead transmission line of tangent tower

Abstract

The invention discloses a method for calculating the thickness and the weight of ice coating on an overhead transmission line of a tangent tower. The method comprises the following steps of: 1, calculating basic mechanic parameters of a wire at ice coating temperature but without ice coating in a vertical plane according to the design parameters; 2, calculating height difference angle in a wind deviation plane, wire horizontal stress, wire deadweight ratio load in a vertical direction, horizontal span and wire length from the lowest point of a wire of big and small side towers to a main tower according to the wind deviation angle of an isolator string measured by a sensor; and 3, establishing a relation expression between the tilt angle of the isolator string in the wind deviation plane and the wind deviation angle of the isolator string in the wind deviation plane and the tilt angle of the isolator string in the vertical plane, and establishing an equation of load balance in the vertical direction after the ice coating in the wind deviation plane, and calculating the thickness and weight of equivalent ice coating of the wire. The method has the advantages of reducing the equipment quantity, and improving the calculation precision and the accuracy and the reliability of the calculation result.

Description

technical field [0001] The invention relates to the field of on-line monitoring of icing on transmission lines in the field of electric power, in particular to a mechanical method for calculating the equivalent icing thickness and weight of overhead transmission lines. Background technique [0002] my country is one of the countries in the world where transmission lines are seriously covered with ice. Severe ice and snow accumulation will lead to a sharp decline in the mechanical and electrical performance of transmission lines, causing accidents such as insulator flashover, line tripping, line disconnection, tower collapse, conductor galloping, and communication interruption. At the beginning of 2008, some provinces in southern my country suffered from the most serious freezing rain and snow disasters in the past 80 years. Ice flashes occurred frequently, and accidents such as line tripping, disconnection and tower collapse were common, which threatened the safe and stable ...

AI Technical Summary

Problems solved by technology

The current mechanical monitoring method has the following deficiencies: (1) The influence of wind deflection of insulator strings is not considered; (2) The method of subtracting the wind load in the vertical direction from the wind load in the vertical direction to obtain the ice load has no mechanical connection; (3 ) The wind speed sensor is installed on the top of the pole tower. The wind speed at the top of the tower is different from the wind speed at the actual line and the wind speed has great randomness. Directly using the wind speed at the top of the tower instead of the wind speed of the wire will cause calculation errors; (4) The length of the wire is directly calculated by The product of multiplying the vertical span by an estimated coefficient will bring a large error

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