A monitoring method, apparatus and system for operation management abnormity in a power grid

The invention provides a monitoring method, apparatus and system for operation management abnormity in a power grid. The method comprises the steps of: step S10, periodically collecting voltage data set at monitoring points at specific locations in the power grid circuit; step S12, according to the monitoring points sequentially from the bottom to top and in accordance with a predetermined strategy, comparing the periodically collected voltage data of each of the monitoring points with a preset threshold range corresponding to each monitoring point and determining an abnormal monitoring point; step S14, obtaining the data of the abnormal monitoring points; if the duration of the occurrence of the abnormality exceeds a preset second threshold value and the monitoring point is located on a bus of a section of the low-voltage side of a main transformer, performing operation management abnormality analysis with a predetermined second strategy to determine the cause of the operation management abnormality and keep