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Electromagnetic Field Emission From Gas-to-Air Bushing in a GIS During Switching Operations

机译：切换操作期间GIS中气-气套管产生的电磁场发射

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摘要

Very fast transient overvoltages (VFTOs) and the associated very fast transient currents (VFTCs) generated during switching operations in a gas-insulated substation (GIS) radiate electromagnetic (EM) fields, which in turn can leak into the external environment through apertures like $SF_6$ gas-to-air bushing. Therefore, it becomes necessary to characterize and quantify the EM fields when sensitive control devices are used for the operation of such substations. Keeping this in view, a numerical model using a finite-difference time-domain (FDTD) technique was developed to compute the transient field emission from a 245-kV-rated gasto- air bushing. Shielding effectiveness (SE) of the bushing for these transient fields was evaluated using a derivative Gaussian current excitation of the high-tension (HT) conductor. The variation in EM field levels along the axis of bushing at various radial distances for different frequencies of the transient current were analyzed. The enhancement of the field levels due to the presence of a metallic structure on the ground plane, which simulates the control cubicle or the grounded enclosures of the GIS, were studied. Finally, the emission levels from different bushing models were calculated for the VFTC generated during a switching event, and the dominant frequencies were identified.
机译：在气体绝缘变电站（GIS）的开关操作过程中产生的非常快速的瞬态过电压（VFTO）和相关的非常快速的瞬态电流（VFTC）会辐射电磁场（EM），电磁场又可能通过诸如$的孔泄漏到外部环境中SF_6 $气对空套管。因此，当灵敏的控制设备用于此类变电站的操作时，有必要表征和量化EM场。考虑到这一点，开发了使用有限差分时域（FDTD）技术的数值模型，以计算额定245 kV气-气套管的瞬态场发射。使用高压（HT）导体的微分高斯电流激励，评估了这些瞬态套管的屏蔽效果（SE）。分析了瞬态电流在不同频率下沿轴心在不同径向距离处的电磁场水平的变化。研究了由于地平面上存在金属结构而引起的场级增强，该金属结构模拟了控制柜或GIS的接地外壳。最后，针对开关事件期间生成的VFTC，计算了来自不同套管模型的排放水平，并确定了主导频率。

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