Method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors

The invention discloses a method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors. The method comprises the steps that S2, two grounded divider resistors RT with the same resistance are set inside an insulation monitor mainframe; S4, bus grounded voltage VH and VL is obtained through the ground divider resistors, and the two ground divider resistors are represented through RH and RL; S6, when RH=RL=infinity, VH=VL=2,000 V; S8, when the system single-end ground or insulation resistance is lowered, an equation specified in the description isobtained. Due to the equation, the single-end ground resistance RH1 or RL1 can be obtained. For solving the problem that an existing detection technology error is large, a software algorithm based onthe electric conduction method is put forwards, the algorithm is simplified, the influence of the sampling resistor Rt for the measuring precision is considered, and the measuring precision is improved. The system insulation d