【摘要】 气体绝缘开关设备(gas insulated switchgear,GIS)和气体绝缘输电线路(gas-insulated transmission line,GIL)是电力系统关键核心设备，其运行可靠性直接关系整个电网能源输送通道的安全稳定。近年来，交流GIS/GIL多次出现通过了现场交接耐压试验之后，仍在系统调试或实际运行中绝缘件闪络的情况，极大影响供电可靠性。该文通过多起类似故障的对比分析，获得了故障的共性特征，进而掌握典型故障工况和诱因。基于故障分析，开展了故障复现试验研究。结果表明，在交直流交替作用下洁净绝缘子未发生放电；模拟缺陷条件下，绝缘子能耐受工频耐压但在较低直流电压(<400k V)下发生放电。试验现象与现场故障一致，证明现场故障可能由GIS/GIL内部微小缺陷在工频和直流残压交替作用下引起。基于此，该文进一步提出针对该类故障的防范抑制建议。该文研究有助于深入认识现场故障成因，提高设备本质安全，保障GIS/GIL安全投运及长期稳定运行。更多还原

【Abstract】 Gas insulated switchgear(GIS) and gas insulated transmission lines(GIL) are key equipment in the power system, and their reliability directly affects the safety and stability of the power grid. In recent years, multiple insulator flashovers have occurred during commissioning and operation, in which the GIS/GIL have passed the on-site handover withstand voltage test, greatly affecting the reliability of power supply. In this paper, common fault characteristics are obtained through comparative analysis of multiple similar faults, and typical fault conditions and causes are grasped. Then, the experiment is conducted for fault replication in the factory. The results indicate that insulator without defects do not discharge under alternating current(AC) and direct current(DC) voltage. Insulators with defects can withstand AC withstand voltage but discharge under DC voltage(<400 kV). The experiment phenomenon is consistent with the on-site fault, verifying that the on-site fault is caused by small defects under the alternating AC and DC voltage. Based on this, prevention and suppression suggestions for this type of fault are further proposed. This study can help to gain a deeper understanding of the cause of on-site faults, improve the intrinsic safety of equipment, and ensure the safe operation and long-term stability of GIS/GIL.更多还原