The IED flash disk should NOT be used to store any user files. Thismight cause disturbance recordings to be deleted due to lack of diskspace.13.6.3.1 Recording times M12179-88 v5The different recording times for Disturbance report are set (the pre-fault time,post-fault time, and limit time). These recording times affect all sub-functions moreor less but not the Event list (EL) function.Prefault recording time (PreFaultRecT) is the recording time before the startingpoint of the disturbance. The setting should be at least 0.1 s to ensure enoughsamples for the estimation of pre-fault values in the Trip value recorder (TVR)function.Postfault recording time (PostFaultRecT) is the maximum recording time after thedisappearance of the trig-signal (does not influence the Trip value recorder (TVR)function).Recording time limit (TimeLimit) is the maximum recording time after trig. Theparameter limits the recording time if some trigging condition (fault-time) is verylong or permanently set (does not influence the Trip value recorder (TVR)function).Operation in test mode M12179-492 v4If the IED is in test mode and OpModeTest = Off. Disturbance report function doesnot save any recordings and no LED information is displayed.If the IED is in test mode and OpModeTest = On. Disturbance report functionworks in normal mode and the status is indicated in the saved recording.Post Retrigger M12155-173 v7Disturbance report function does not automatically respond to any new trigcondition during a recording, after all signals set as trigger signals have been reset.However, under certain circumstances the fault condition may reoccur during thepost-fault recording, for instance by automatic reclosing to a still faulty power line.In order to capture the new disturbance it is possible to allow retriggering(PostRetrig = On) during the post-fault time. In this case a new, complete recordingwill start and, during a period, run in parallel with the initial recording.When the retrig parameter is disabled (PostRetrig = Off), a new recording will notstart until the post-fault (PostFaultrecT or TimeLimit) period is terminated. If a newtrig occurs during the post-fault period and lasts longer than the proceedingrecording a new complete recording will be started.Disturbance report function can handle a maximum of 3 simultaneous disturbancerecordings.1MRK 504 169-UEN A Section 13MonitoringTransformer protection RET650 2.2 IEC 289Application manual
