WAN angle surveillance methods to Wide Area Network Measurement System (WAMS), includes the following steps: Allocate priority to voltage phase angles of a number of plant equipments in power stations; the phase angles will be arranged in accordance with priority and form groups; definite effectiveness dead radio for the phase angle of each group. It will be validity when phase angle is described lower than effectiveness dead radio value; designate at least one reference voltage phase angle of reference point as reference phase angle or phase angle group, calculate the margin between effective phase angle and the reference phase angle or referred group phase and get angle value; show the angle value above the monitoring interface. |