4 results about "Corona" patented technology

The invention discloses a line surrounding environment monitoring and management method based on hidden danger discharge, relates to the technical field of hidden danger discharge identification, and solves the problem that the staged development characteristics of tree barrier discharge cannot be identified and dynamic risk management and control cannot be implemented according to the staged development characteristics in the prior art. According to the invention, the fingerprint characteristics (peak value, frequency spectrum, fractal dimension and the like) of the discharge current are captured through the broadband sensor, and the three stages of corona, spark and flashover are accurately identified by using the AI model, so that the early warning period is prolonged; a dynamic risk index R (x, y) is constructed in combination with a strike distance theory, three elements of tree height, distance and discharge intensity are fused in real time, seasonal weights are automatically adjusted, and the risk misjudgment rate is reduced; finally, a closed-loop management process of'monitoring and early warning, work order distribution, pruning verification and efficiency iteration 'is formed, and the fundamental transformation from'blind person groping type' passive first-aid repair to'cloud and day shifting type 'accurate prevention is realized.

The application provides a UHV line corona loss prediction method based on a Res-BP neural network, and comprises the following steps: in step S1, a random forest algorithm RF is used to calculate and sort the importance of weather conditions by taking MSE as Gini impurity, and weather conditions with high importance are selected to construct a feature set dataset; in step S2, the differences between weather conditions in different dates are utilized, and a BIRCH algorithm is used for classification; on this basis, a Res-BP neural network model is established to predict the UHV transmission line corona loss, and a PSO optimization algorithm is used to optimize and adjust the internal parameters of the model; and the application has good accuracy and stability.

The invention discloses a system for obtaining the annual statistical value of the corona effect of a high-altitude AC power transmission line through quarterly observation, and the system comprises an audible noise measurement device which comprises at least one outdoor microphone disposed at a preset position, and an analyzer; the radio interference measuring device comprises an antenna and a receiver which are arranged at preset positions of the power transmission line; the meteorological equipment is used for measuring and distinguishing weather and rainy days; the computer is in communication connection with the audible noise measuring device, the radio interference measuring device and the meteorological equipment, and is used for synchronously controlling the start and stop of the equipment and collecting and storing data; wherein the audible noise measurement device, the radio interference measurement device and the meteorological equipment form an all-weather synchronous measurement system which is configured to acquire data through synchronous observation of three consecutive months in autumn, and the data are classified and counted by the computer according to weather conditions; and obtaining a rainy day audible noise L50 value capable of representing a year-round statistical result, and a radio interference average value in rainy days and good weather.

The invention discloses an improvement method for altitude correction of corona loss of a high-voltage alternating-current transmission line, and the method comprises the steps: obtaining corona loss data, and obtaining the corona loss data of the high-voltage alternating-current transmission line at different altitudes and corresponding weather conditions; based on the relationship between the corona loss and the corona loss, data mapping from the corona loss to the corona loss is realized; the method comprises the following steps: performing error analysis on a corona loss correction factor recommended by Bonneville Power Administration based on experimental data mapping of corona loss, and proposing a correction suggestion: the corona loss correction factor K is 4.5 dB / km under a dry condition and 1.5 dB / km under a raining condition; and a theoretical basis is provided for power transmission line wire selection, parameter optimization, tower line arrangement and phase sequence arrangement optimization. According to the research, the accuracy of corona loss evaluation of alternating-current transmission lines in different altitudes of regions is improved, the economic efficiency of power transmission and the safe operation of a system are improved, and potential risks caused by corona loss are reduced.