On-line abnormity detection method, apparatus and system in power grid

The invention provides an on-line abnormity detection method in a power grid. The method comprises: S10, collecting voltage data of monitoring points arranged at specific positions in a power grid circuit periodically; S12, comparing the voltage data collected periodically at all monitoring points with preset threshold ranges corresponding to all monitoring points according to an order of the monitoring points from low to high based on a predetermined strategy and determining an abnormal monitoring point; and S14, obtaining abnormality determination data associated with the abnormal monitoring point and storing the data. In addition, the invention also provides a corresponding apparatus and system. With the method, apparatus, and system provided by the invention, troubleshooting can be realized rapidly; the outage range can be reduced; the outage time is shortened; and power supply reliability is improved. 本发明提供种电力网中在线异常的监测方法，包括步骤：步骤S10、周期性采集设置于在电力网电路中特定位置的监测点上的电压数据；步骤S12、按照监测点从低到高的顺序并依据预定策略，将所述周期性采集到的各监测点的电压