In this study we investigate the time and space transition characteristics of DC electric field in SF6 gas from the initial state DC-on to final DC steady-state in gas-solid composite insulation systems. Using a simple rod-electrode configuration and actual insulating epoxy-spacer model, the electric field distributions of the epoxy-spacer in SF6 gas and time constant T of electric field formation from DC-on to DC steady-state are calculated based on the electric conduction characteristics. In addition, the emerging electric field distributions due to accumulated charge on solid insulator surface are introduced to elucidate the time transition process of electric field stress in the gap between HV conductor and GND. As a result, we quantitatively clarify that the time constant T of electric field formation are highly dependent on the non-uniform factor η and location of the gap space in the electrode configuration under non-uniform DC electric field. The locations with higher electric field stress in the gap space have the shorter time constant T. In addition, the time transition process of electric field stress in SF6 gas depends on the gap space and the location of maximum electric field change during time transition. Especially, we clarify that the highest electric field stress in SF6 gas may emerge in actual GIS structure based on the time transition process of emerging electric field due to accumulated charge.

中文翻译：

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气固复合绝缘结构中基于累积电荷涌现场的直流电场分布的时空转变


在本研究中，我们研究了气固复合绝缘系统中 SF6 气体中的直流电场从初始状态 DC-on 到最终 DC 稳态的时间和空间过渡特性。使用简单的棒电极配置和实际绝缘环氧树脂隔离物模型，基于电学计算了SF6气体中环氧树脂隔离物的电场分布以及从直流接通到直流稳态的电场形成时间常数T。传导特性。此外，还引入了由于固体绝缘体表面累积电荷而出现的电场分布，以阐明高压导体和接地之间的间隙中电场应力的时间转变过程。因此，我们定量地阐明，在非均匀直流电场下，电场形成的时间常数 T 高度依赖于非均匀因子 η 和电极结构中间隙空间的位置。间隙空间中电场应力较高的位置具有较短的时间常数T。此外，SF6气体中电场应力的时间转变过程取决于间隙空间和时间转变过程中电场变化最大的位置。特别是，我们根据累积电荷产生电场的时间过渡过程，阐明了实际 GIS 结构中可能会出现 SF6 气体中的最高电场应力。