A risk assessment method for transmission line icing

Abstract

The invention belongs to the technical field of icing risk assessment of transmission lines, and in particular relates to a risk assessment method for icing of transmission lines, which includes: according to the possible impact degree, scope and development trend of icing incidents on transmission lines, the icing status of transmission lines The risk level is divided into five levels according to the ice thickness range; the final risk assessment index is extracted from the three major aspects of meteorological factors, environmental factors and line parameters, so as to establish the line icing risk assessment index system; the indicators are consistent Using entropy weight method to determine the weighted standardized decision matrix; using the TOPSIS method to determine the positive and negative ideal solutions for the weighted standardized decision matrix; using the matter-element extension method to divide the positive and negative ideal solution intervals and calculate the degree of closeness; Calculate the characteristic value, classify the grades of each evaluation scheme, and judge the grade of the evaluation object. The invention is used to evaluate the icing risk of the transmission line and provide support for the risk management work of the power grid management department.

Description

technical field

[0001] The invention belongs to the technical field of icing risk assessment of transmission lines, and in particular relates to a method for icing risk assessment of transmission lines. Background technique

[0002] The risk assessment of the icing status of transmission lines is the basis for building the ice disaster defense system of the power grid. A scientific and reasonable icing risk assessment model is helpful for timely and accurate early warning of possible freezing disaster risks, thus effectively ensuring the safety of the power grid. Stable operation, reducing the occurrence of freezing disasters. At present, there is a lack of scientific, practical and comprehensive assessment models for power line icing assessment to guide transmission line design and ice disaster emergency management. Therefore, online monitoring data should be fully utilized, and scientific assessment models should be effectively combined to systematically carry out transmis...

Examples

Embodiment Construction

[0026] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0027] 1 Risk level definition of transmission line icing state

[0028] According to the possible impact degree, scope and development trend of the icing event on the transmission line, the present invention divides the risk level of the icing state of the transmission line into five levels according to the ice thickness range: level I (mild), level II (general), grade III (moderate), grade IV (severe), and grade V (very serious), which are represented by gray, blue, yellow, orange and red in turn, as shown in Table 1.

[0029] Table 1 Classification of icing risk levels

[0030]

[0031] Level I icing: mild icing, ice thickness ranges from 0 to 5mm, short icing time, small changes in meteorological factors, slow growth rate of icing, low degree of harm, icing on lines can fall off naturally.

[0032] Class II icing: general icing, the thickness of the ice is 5-10mm,...

technical field

[0001] The invention belongs to the technical field of icing risk assessment of transmission lines, and in particular relates to a method for icing risk assessment of transmission lines. Background technique

[0002] The risk assessment of the icing status of transmission lines is the basis for building the ice disaster defense system of the power grid. A scientific and reasonable icing risk assessment model is helpful for timely and accurate early warning of possible freezing disaster risks, thus effectively ensuring the safety of the power grid. Stable operation, reducing the occurrence of freezing disasters. At present, there is a lack of scientific, practical and comprehensive assessment models for power line icing assessment to guide transmission line design and ice disaster emergency management. Therefore, online monitoring data should be fully utilized, and scientific assessment models should be effectively combined to systematically carry out transmis...

Examples

Embodiment Construction

[0026] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0027] 1 Risk level definition of transmission line icing state

[0028] According to the possible impact degree, scope and development trend of the icing event on the transmission line, the present invention divides the risk level of the icing state of the transmission line into five levels according to the ice thickness range: level I (mild), level II (general), grade III (moderate), grade IV (severe), and grade V (very serious), which are represented by gray, blue, yellow, orange and red in turn, as shown in Table 1.

[0029] Table 1 Classification of icing risk levels

[0030]

[0031] Level I icing: mild icing, ice thickness ranges from 0 to 5mm, short icing time, small changes in meteorological factors, slow growth rate of icing, low degree of harm, icing on lines can fall off naturally.

[0032] Class II icing: general icing, the thickness of the ice is 5-10mm,...

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