A trigger can be of type:• Manual trigger• Binary-signal trigger• Analog-signal trigger (over/under function)Manual triggerA disturbance report can be manually triggered from the local HMI, PCM600 or viastation bus (IEC 61850). When the trigger is activated, the manual trigger signal isgenerated. This feature is especially useful for testing.Binary-signal triggerAny binary signal state (logic one or a logic zero) can be selected to generate a trigger(Triglevel = Trig on 0/Trig on 1). When a binary signal is selected to generate a triggerfrom a logic zero, the selected signal will not be listed in the indications list of thedisturbance report.Analog-signal triggerAll analog signals are available for trigger purposes, no matter if they are recorded in thedisturbance recorder or not. The settings are OverTrigOp, UnderTrigOp, OverTrigLe andUnderTrigLe.The check of the trigger condition is based on peak-to-peak values. When this is found, theabsolute average value of these two peak values is calculated. If the average value is abovethe threshold level for an overvoltage or overcurrent trigger, this trigger is indicated witha greater than (>) sign with the user-defined name.If the average value is below the set threshold level for an undervoltage or undercurrenttrigger, this trigger is indicated with a less than (<) sign with its name. The procedure isseparately performed for each channel.This method of checking the analog trigger conditions gives a function which isinsensitive to DC offset in the signal. The operate time for this initiation is typically in therange of one cycle, 16 2/3 ms for a 60 Hz network.All under/over trig signal information is available on the local HMI and PCM600.14.4.6.12 Post RetriggerDisturbance report function does not automatically respond to any new trig conditionduring a recording, after all signals set as trigger signals have been reset. However, undercertain circumstances the fault condition may reoccur during the post-fault recording, forinstance by automatic reclosing to a still faulty power line.Section 14 1MRK 502 048-UUS AMonitoring574Technical manual
