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控制图法在优化天然气长输管道压力安全设备定值中的应用 被引量:2
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作者 叶喆 《化工管理》 2021年第33期80-82,186,共4页
现行天然气长输管道设计规范没有详细全面地规定不同压力安全设备在不同压力超限情况下的行动水平,没有阐明如何参考现有运行压力数据来评价压力波动处于何种超限水平,以及避免不同行动水平设备间的越级响应。为解决上述问题,文章在已... 现行天然气长输管道设计规范没有详细全面地规定不同压力安全设备在不同压力超限情况下的行动水平,没有阐明如何参考现有运行压力数据来评价压力波动处于何种超限水平,以及避免不同行动水平设备间的越级响应。为解决上述问题,文章在已有运行压力数据的参考基础上,将控制图法应用于管网压力波动超限水平的评价,增加压力超限水平的控制限值,进一步优化压力安全设备的定值,提高管网系统的运行平稳可靠性。 展开更多
关键词 控制图法 压力安全设备 定值
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Research on the feature extraction of DC space charge behavior of oil-paper insulation 被引量:13
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作者 TANG Chao LIAO RuiJin +1 位作者 CHEN George YANG LiJun 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第5期1315-1324,共10页
As the ultra high DC voltage grid comes into an important stage in the ‘Twelfth Five-year Plan’ of China, the requirement on the operation safety of power equipment needs to be improved. Oil-paper insulation plays a... As the ultra high DC voltage grid comes into an important stage in the ‘Twelfth Five-year Plan’ of China, the requirement on the operation safety of power equipment needs to be improved. Oil-paper insulation plays a significant role as the main insulation material of many key power equipments. The space charge behaviors of oil-paper insulation not only affect the dielectric strength, but also relate to the stability and security of power transmission facilities. Until now, the research on the space charge behaviors of oil-paper insulation remains on the stage of objective description and phenomenon explanation, thus it is very urgent to make some feature extractions on the test results in order to further investigate the DC space charge behaviors of oil-paper insulation. In this paper, based on the large numbers of test data in the first stage, data mining and feature extractions were performed on the DC space charge behavior of oil-paper insulation. The variation laws of some key characteristic parameters obtained in different experiment conditions such as the total charge injection amount, apparent charge mobility, and trap energy distribution were analyzed. In addition, the distribution of trapping level inside oil-paper was calculated by using the PEA test results based on the mechanism of the isothermal decay current, which realized the approximate calculation of trap depth by charge decay characteristics. What’s more, the exponential injection and decay equations of DC space charge changing with time were acquired for the first time, and the physical meanings of related parameters were defined. This has laid a foundation for the prediction and simulation of space charge in the oil-paper insulation. 展开更多
关键词 oil-paper insulation space charge DC feature extraction
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