基于归一化油纸能量强度的二元模型获取变压器和电抗器的故障严重程度

Devaprasad Paul, A. Goswami
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引用次数: 1

摘要

为了研究石油$(\ mathm {N}\ mathm {E}\ mathm {I}_{\ mathm {o}\ mathm {I}})$与纸张$(\ mathm {N}\ mathm {E}\ mathm {I}_{\ mathm {p}\ mathm {p}\ mathm {E}\ mathm {r}})$的归一化能量强度之间的依赖关系,本文建立了一个耦合模型。$\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{o}\mathrm{I} 1}$和$\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{p}\mathrm{a}\mathrm{p}\mathrm{E}\mathrm{r}}$是根据服役十年以上的变压器和电抗器的溶解气体实时分析数据得出的。考虑到正相关和拟合优度,Gumbel copula最适合于二元联合分布的建模。联结模型的结果表明,$ $\ mathm {k}\ mathm {J}/ $ mathm {k}\ mathm {L}$在$ $\ mathm {N}\ mathm {E}\ mathm {I} 1}$中每增加$ $0.5\ mathm {k}\ mathm {J}/\ mathm {k}\ mathm {L}$, $ $\ mathm {N}\ mathm {E}\ mathm {I}_{\ mathm {p}\ mathm {p}\ mathm {E}\ mathm {r} $的增量在1.0到$2.2\ mathm {k}\ mathm {J}/\ mathm {k}\ mathm {L}$之间。论证了除考虑$\ mathm {N}\ mathm {E}\ mathm {I}_{\ mathm {p}}\ mathm {p}}\ mathm {E}}\ mathm {I}_{\ mathm {o}\ mathm {I} 1}$外,还考虑$\ mathm {N}\ mathm {E}}$对故障严重程度评定和变压器电抗器液固绝缘内部状况评定的重要性。所进行的研究将有助于根据NEI值对设备进行监测、维护和调节评估,这将进一步有助于减少在役变压器和电抗器前所未有的故障。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bivariate Modelling of Normalized Energy Intensity of Oil and Paper for Accessing the Fault Severity of Transformer and Reactors
This paper aims at developing a copula model for investigating the dependence structure between normalized energy intensity of oil $(\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{o}\mathrm{i}1})$ and normalized energy intensity of paper $(\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{p}\mathrm{a}\mathrm{p}\mathrm{e}\mathrm{r}})$. The $\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{o}\mathrm{i}1}$ and $\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{p}\mathrm{a}\mathrm{p}\mathrm{e}\mathrm{r}}$ are derived from real time dissolved gas analysis data of in-service transformer and reactors having age more than a decade. Considering the positive correlation and goodness-of-fit, Gumbel copula is found to be most suitable for modeling the bivariate joint distribution. Results of the copula model indicate that for an increment of $0.5\mathrm{k}\mathrm{J}/\mathrm{k}\mathrm{L}$ in $\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{o}\mathrm{i}1}$ there is an increment in $\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{p}\mathrm{a}\mathrm{p}\mathrm{e}\mathrm{r}}$ between 1.0 and $2.2\mathrm{k}\mathrm{J}/\mathrm{k}\mathrm{L}$. It demonstrates the importance of considering $\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{p}\mathrm{a}\mathrm{p}\mathrm{e}\mathrm{r}}$ in addition to $\mathrm{N}\mathrm{E}\mathrm{I}_{\mathrm{o}\mathrm{i}1}$ for assessing the fault severity and evaluating the internal condition of liquid and solid insulation of transformer and reactor. The study undertaken will help in monitoring, maintenance, and conditioning assessment of the equipment based on the NEI values, which will further help in saving unprecedented failure of in-service transformer and reactors.
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