110 kV输电线路塔杆接地电阻检测算法研究

Detection Algorithm of Grounding Resistance of 110 kV Transmission Line Towers

电力系统的稳定性与雷击电流涌入大地的稳定性密切相关,而雷击电流涌入大地的性能取决于塔杆接电线接地电阻的大小,因此需密切关注塔杆接地电阻。基于塔杆与接电线的等效电路模型,提出了一种使用电压互感器和电流互感器的便携检测方法,该方法通过电压互感器发出的电压,在接地线上感应出电流,进而通过欧姆定律计算出接地电阻。该方法具有精度高、易操作、灵活性高、成本低等优点。算例结果表明,该方法能够有效、精准地测量接地电阻。

The stability of the power system is closely related to the stability of the lightning current entering the ground,and the performance of the lightning current entering the ground depends on the grounding resistance of tower poles.Therefore,it is necessary to closely monitor the grounding resistance of tower poles.Based on the equivalent circuit model of tower poles and grounding wires,this paper proposes a portable detection method using voltage transformers and current transformers.This method emits voltage through a voltage transformer,induces current on the grounding wire,and then calculates the grounding resistance using Ohm's law.This method has the advantages of high accuracy,easy operation,high flexibility,and low cost.Case study results demonstrate that this method can effectively and accurately measure grounding resistance.