Method and system for galloping prediction of overhead transmission line based on ice-covered shape test
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An overhead transmission line and forecasting method technology, applied in the field of power transmission and distribution, can solve the problems of high cost, short warning time, limited precision and accuracy, etc. Effect
Active Publication Date: 2021-01-15
STATE GRID HUNAN ELECTRIC POWER +3
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[0003] The current galloping prediction technology mainly focuses on galloping situation prediction and galloping meteorological warning. The galloping situation prediction is mostly based on the weather situation to judge the qualitative prediction of the galloping occurrence. Galloping Early Warning Method and System” proposes to carry out forecast and early warning of galloping early warning areas by collecting meteorological element data and forecast data on power system transmission lines in real time. On-site devices need to be installed, which is costly and can only warn of galloping conditions in the next few hours , short warning time
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Embodiment 1
[0026] This embodiment discloses a method for predicting galloping of overhead transmission lines based on ice-covered shape tests, such as figure 1 shown, including:
[0027] Step S1, building an artificial climate chamber. Among them, the wind speed v, temperature t, and rainfall p of the artificial climate chamber are controllable.
[0028] Step S2: Carry out ice coating shape tests of different line structures under different meteorological conditions in the artificial climate chamber, and obtain observation records. Specifically, it is to obtain the observation records of the average conductor ice thickness H, the conductor maximum ice thickness L, and the conductor minimum ice thickness S changing with time T under different meteorological conditions and line structure conditions, denoted as C, C i =[H i , L i , S i ,T i ]; where, i is the serial number of the observation record.
[0029] Step S3, draw the growth curve of the ice thickness according to the observa...
Embodiment 2
[0036] Corresponding to the above-mentioned method embodiments, this embodiment discloses a system for galloping prediction of overhead transmission lines based on icing shape tests, which at least includes the following first to fourth processing units.
[0037] The first processing unit is used to carry out ice coating shape tests of different line structures under different meteorological conditions in an artificial climate chamber with controllable wind speed v, temperature t, and rainfall p, and obtain the average ice coating of conductors under different meteorological conditions and line structure conditions Observation records of thickness H, wire maximum ice thickness L, wire minimum ice thickness S changing with time T, denoted as C, C i =[H i , L i , S i ,T i ]; where i is the serial number of the observation record.
[0038] The second processing unit is used to draw the ice thickness growth curve based on the observation records of the artificial climate chamb...
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Abstract
The invention relates to the technical field of power transmission and distribution, and discloses an icing shape test-based overhead power transmission line galloping prediction method and system, which gets rid of constraints of a field detection device and realizes scientific and reliable line galloping prediction. The method comprises the steps of carrying out icing shape tests of different line structures under different meteorological conditions in a phytotron to obtain observation records; according to the observation records of the phytotron, drawing an icing thickness increment curve, and through curve fitting, establishing a function relationship of icing thickness increment degree; determining an icing non-uniformity calculation formula, drawing an icing non-uniformity curve according to the observation records of the phytotron, and through curve fitting, establishing a function relationship of icing shape non-uniformity; and according to the fit icing thickness increment degree function, predicting icing thickness in a natural condition, according to the fit icing shape non-uniformity function, predicting icing non-uniformity in the natural condition, and based on a galloping prediction model, performing power transmission line galloping prediction.
Description
technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a method and system for galloping prediction of overhead transmission lines based on ice-covered shape tests. Background technique [0002] Affected by the cold air going south in winter, ice-covered galloping disasters occur frequently on overhead transmission lines. Galloping is more harmful to the line. Not only is it easy to cause flashover and tripping of the line, but more seriously, galloping can easily cause serious damage to the conductor itself, connecting parts and iron towers. Serious power grid safety accidents such as broken strands and broken wires, loosening and falling off of tower bolts, and even downed towers occur. Dancing disasters have become a major threat to the safety of power grid operation in winter. The galloping prediction of overhead lines is an important means of galloping prevention and control. Accurate galloping predi...
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