Multi-span overhead transmission line icing shape finding calculation method based on energy method

Abstract

The invention belongs to the field of power transmission lines, and discloses a multi-span overhead power transmission line icing shape finding calculation method based on an energy method. The methodcomprises the following steps: S1, acquiring basic data and icing parameter information of initial non-icing of a multi-span overhead power transmission line; S2, calculating the horizontal stress and the original length of the initial uniced overhead transmission line, and the deflection angle of the insulator string; S3, calculating the horizontal stress of the iced overhead transmission line and the deflection angle increment of each insulator string based on the principle of minimum potential energy; and S4, constructing the icing shape of the multi-span overhead transmission line according to the deflection angle of each iced insulator string and the span, the height difference and the horizontal stress of each overhead transmission line calculated in the step S3. According to the method, the problem that modeling is complex and tedious in the multi-span overhead power transmission line shape finding process through existing finite element software can be solved, and the method is suitable for various conditions such as height difference, no height difference and multi-span different icing and can be widely applied to the field of power transmission lines.

Description

technical field [0001] The invention relates to an energy method-based ice-covered form-finding calculation method for a multi-span overhead power transmission line, which belongs to the technical field of power transmission lines. Background technique [0002] Today, with the rapid economic development, electric energy has become an indispensable resource for social development and people's normal life. How to ensure the transmission of electricity has become an important issue related to the national economy and the people's livelihood. In order to ensure the safety and stability of the national power transmission network, various mechanical calculations and analyzes of overhead transmission lines are required. Icing of overhead transmission lines is a working condition that must be considered when designing lines in heavy ice areas. [0003] At present, the commonly used analysis and calculation method is finite element software. In order to accurately analyze the stress...

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Problems solved by technology

[0004] Regarding the form-finding methods of conductors, there are currently some form-finding methods for single-span conductors, including direct iteration method, small elastic modulus method and prefabricated model update method, etc.; for multi-span overhead transmission lines with straight towers in the middle , because the insulator strings in the middle straight tower can swing off-angle, the existing single-span form-finding method cannot be used

The commonly used multi-span form-finding methods include the representative span method, but the representative span method has relatively low accuracy; most of the other multi-span form-finding methods are based on finite element software. When parameters such as span, sag and ice thickness need to be changed, remodeling is required, which is a huge workload and inconvenient

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