Corona-cage-test-based method and system for obtaining audible noises below high-voltage direct-current power transmission split lead

Abstract

The invention provides a corona-cage-test-based method and system for obtaining audible noises below a high-voltage direct-current power transmission split lead. A split lead erected in a corona cage is used for measuring audible noises; a function relation between audible noise generation power and a lead surface field intensity is obtained; and on the basis of the function relation, audible noises at an observation point below the lead in the practical line are calculated. On the basis of the technology in the prior art, data of a corona cage are converted to the practical line and thus the reference is provided for the ultra-high-voltage direct-current line design. The method comprises: a high-voltage direct-current power transmission split lead is erected in a corona cage; a series of voltages are loaded at the lead; audible noises are measured at the wall or outside of the corona cage; the measured data are calculated to obtain the function relation A0=f(E) between the audible noise generation power and the lead surface field intensity of the testing lead; and the audible noises below the practical line is calculated based on the function relation, obtained by the corona cage, between the audible noise generation power and the lead surface field intensity.

Description

technical field [0001] The present invention relates to the field of high-voltage circuits, and more particularly, relates to a method and system for obtaining audible noise under split conductors for high-voltage direct current transmission using a corona cage experiment. Background technique [0002] my country is the first in the world to research and successfully build a ±800kV UHV DC transmission project, and will further research and develop a ±1100kV UHV DC transmission project. With the increase of voltage level, audible noise has become an important factor restricting the selection of UHV DC line conductors and environmental protection acceptance. [0003] With the rapid development of my country's UHV power grid, the electromagnetic environment test research based on UHV corona cage has started. The State Grid Corporation of China has built the world's largest outdoor corona cage at the Beijing UHV DC Test Base for research on the corona characteristics of UHV DC ...

AI Technical Summary

Problems solved by technology

[0006] However, unlike AC corona cages, the test method for audible noise tests using DC corona cages is not yet mature, and the existence of ion current effects and its unidirectional movement characteristics also lead to the particularity of audible noise research on DC lines

These difficulties have made it difficult to directly convert the audible noise data measured in the DC corona cage to the actual line, which seriously restricts the further research on the audible noise of the DC line.

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