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Substation and Transmission Lines Earthing System Design under Substation Fault

机译:变电站故障下变电站及输电线路接地系统设计

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High-voltage substations are fed by transmission lines with the earthing system solidly bonded to the substation earth grid. Under substation fault, both the substation earth grid and the pole grid resistance are exposed to voltage rise. This voltage rise could reach unacceptable and dangerous levels. Earthing system design ensures safety compliance for both the substation and transmission lines under fault conditions. This article analyses the relation between the substation earth potential rise and the transmission pole earth potential rises. The analysis shows that the poles located within the finite length from the substation form a solid input to the substation earth potential rise. The article reviews the existing literature and develops the formulas to assist the designer to compute the substation earth potential rise from the pole earth potential rise and vice versa. The article proposes modifications to IEEE earthing design block diagram. This modification ensures that the transmission line earthing system is always compliant to allowable safety limits under substation fault. Furthermore, the article shows the method to estimate the substation earth potential rise by measuring the pole earth potential rise with a case study.
机译:高压变电站由传输线供电,接地系统牢固地连接到变电站的接地网。在变电站故障下,变电站的接地网和极网电阻均会受到电压上升的影响。该电压上升可能会达到不可接受的危险水平。接地系统设计可确保故障条件下变电站和输电线路的安全合规性。本文分析了变电站接地电位上升与输电杆接地电位上升之间的关系。分析表明,位于变电站有限长度内的磁极形成了变电站接地电位上升的可靠输入。本文回顾了现有文献并开发了公式,以帮助设计人员从极地电位升高计算变电站地电位升高,反之亦然。本文提出了对IEEE接地设计框图的修改。此修改可确保变电站故障时,传输线接地系统始终符合允许的安全极限。此外,本文还通过案例研究显示了通过测量极地电位升高来估算变电站地电位升高的方法。

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