张凯军,胡志坚,张博成.计及地线耦合的利用架空线路测量接地网接地阻抗的方法[J].电测与仪表,2017,54(12):. zhangkaijun,huzhijian,zhangbocheng.Method for Measuring Grounding Resistance of Grounding Grid Considering the Influence of Earth Wire Coupling[J].Electrical Measurement & Instrumentation,2017,54(12):.
计及地线耦合的利用架空线路测量接地网接地阻抗的方法
Method for Measuring Grounding Resistance of Grounding Grid Considering the Influence of Earth Wire Coupling
When overhead lines are used to measure the impedance of grounding grid, the current through grounding grid is less than actual injected if the ground grid is connected with the overhead ground lines. The current bypass the ground line will generate a coupling voltage on the circuit because of the electromagnetic coupling effect between ground line and conduct line. In order to reduce the measurement error caused by ground line shunt, this paper proposed that ground line shunt should be measured at the same time when the voltage of ground grid and actual injected current are measured. And a mathematical model is built by a few measurement data to reduce the influence of the electromagnetic coupling effect between ground line and conduct line. The simulation results show that if there are few towers connected with the ground line, the proposed method can effectively reduce the measurement error caused by ground line shunt current when the overhead line is used to measure the grounding impedance.
