The Research On Gan Xi Grounding Grids Fault Diagnosis Base On Theory Of Electrical Network

Grounding grid is an important device to ensure the safe and reliable operation of the power system and to ensure the safety of the personnel.The conductor of the ground network is buried underground for a long time,which is corroded by the electric force of the soil corrosion and the discharge current.It is easy to corrode and even break,causing accidents and bring huge economic losses.The method of large area excavation is used for the detection of ground network.This method has the disadvantages of blindness,heavy workload and slow speed.Therefore,it is very important to study the diagnosis method of grounding grids on and find out the failure points in time.This paper mainly studies the problem of branch fault diagnosis of grounding grid in substation,,ignoring the effect of the capacitance and inductance on reasonable assumptions on of substation grounding grid in the basis of further study of grounding grid fault diagnostic.The grid is equivalent to a linear resistive network.The measured voltage value by applying a constant excitation source grounding,The grid fault diagnosis model was established based on the theory of electrical networks,which is combined with the network topology,judging the situation of grounding grid corrosion fault by solving the grounding resistance value of each branch,the results of simulation show that this method can accurately diagnose the fault of the ground network.Diagnosing the fault of grid at the end of a 110 kV substation grounding of ganxi company.Establishing the equivalent network topology structure,which according to the construction drawings,the establishment of network fault diagnosis equation based on the theory of electrical networks,solving grid branch conductor resistance changes,judging by the resistance value of grounding fault,the practice that can accurately diagnose the grounding conductor the fault condition has certain engineering application value.