Through a comprehensive analysis on various dynamic monitoring data and a large amount of fine numerical simulation study of dense grid, it makes clear the residual oil distribution.

通过各种动态监测资料综合分析和密网络大规模精细数值模拟研究，搞清了剩余油分布状况。

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This paper introduces the parameter selection, installation, grounding mode of low-voltage power grid and construction method of residual current operated protective device.

文中详细论述了剩余电流动作保护装置的参数选用，安装要求，低压电网接地方式及安装施工要求等。

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Residual smoothing, local time stepping and a new multi-grid scheme were employed to improve calculative efficiency and accelerate the convergence.

为提高计算效率，采用了多重网格法、当地时间步长和残差光顺等加速收敛措施。

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