Audible noise measuring method for high voltage DC transmission line in corona cage
A transmission line, high-voltage DC technology, applied in the direction of noise figure or signal-to-noise ratio measurement, etc., can solve the problem that the audible noise of the wire is small, the relationship between the 8kHz frequency component and the A sound level has not been given, and the audible noise of the wire is difficult to accurately measure. Measurement and other issues to achieve the effect of short measurement time
Inactive Publication Date: 2012-07-18
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
For example, the surface field strength of the split conductors that may be used in China's EHV / UHV DC transmission projects is all in the range of 18kV / cm-28kV / cm, and most of them are in the range of 18kV / cm-24kV / cm, all of which are in the state of the conductor just fainting , at this time the audible noise generated by the wire is very small, and when the external environment is complex, it is difficult to measure the audible noise of the wire accurately
Studies at home and abroad have shown that the 8kHz frequency component in audible noise has the same variation trend as the overall noise level, and is less disturbed, but the quantitative relationship between the 8kHz frequency component and the A sound level has not been given in the prior art
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Embodiment
[0026] Embodiment: The effect of the present invention is illustrated by taking the measurement results of the UHV corona cage audible noise measurement system of State Grid Corporation located in Changping, Beijing as an example.
[0027] Through a large number of experiments, it is found that in the measurement results of the audible noise of the UHV corona cage, the difference between the value of the 8kHz component and the value of the A sound level is about 11dB in most cases. Such as Figure 4 As shown, take 6×720mm 2 Take the wire as an example. Under different surface field strengths, compare the 50% statistical value of the 8kHz component in the measurement noise with 11dB and the 50% value of the A sound level data. It can be seen that the surface field strength of the wire is higher When the value is large, the data fit is very good. When the surface field strength is greater than 24kV / cm, the difference is basically around 1dB or below; when the surface field str...
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The invention relates to an audible noise measuring method for a high voltage DC transmission line in a corona cage, which comprises the following steps: (1) measuring 8kHz component in corona audible noise sound pressure of the high voltage DC transmission line in the corona cage through equipment capable of measuring sound frequency spectrum, and distinguishing background noise through the 8kHz component in the corona audible noise of the transmission line; (2) converting the 8kHz component in the corona audible noise of the transmission line into a decibel with 20 micron Pa as benchmark; and (3) performing simple operation on the 8kHz component in the corona audible noise of the transmission line converted in the step (2) to obtain A sound level of the corona audible noise of the transmission line, and finishing the measurement on the audible noise of the high voltage DC transmission line in the corona cage. The measuring method disclosed by the invention can effectively eliminate the effect of the background noise to obtain accurate A sound level of the corona audible noise in a simple and easy realization manner, and the measuring time is short, so that the measuring method can be applied in the audible noise measurement of high voltage DC transmission line with continuous background noise in the corona cage.
Description
technical field [0001] The invention relates to a method for measuring noise in the electric power field, in particular to a method for measuring the audible noise of a high-voltage direct current transmission line in a corona cage. Background technique [0002] With the improvement of the voltage level of DC transmission projects, the noise control of transmission lines is particularly important. It is directly related to the selection of DC line conductors, line optimization design, project investment, and environmental protection. "Friendly" UHV transmission lines are of great significance. [0003] At present, the experimental research on the audible noise of the DC line can be realized by the experimental line segment, and the experimental research results of the real wire are the most convincing. However, weather conditions have an impact on the audible noise of the DC line. The environment and weather around the test line are uncontrollable, and it is difficult to ac...
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IPC IPC(8): G01R29/26
Inventor 刘元庆郭剑陆家榆
Owner CHINA ELECTRIC POWER RES INST