5-164 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUALSYSTEM SETUP CHAPTER 5: SETTINGS5Figure 5-83: Rate of change of frequency trigger logic5.5.8.18 PMU recordingSETTINGS SYSTEM SETUP PHASOR MEASUREMENT UNIT PHASOR MEASUREMENT UNIT 1 RECORDINGPMU 1PMU 1 FUNCTION — This setting enables or disables the recorder for PMU 1. The rate is fixed at the reporting rate set withinthe aggregator (that is, Aggregator 1).PMU 1 NO OF TIMED RECORDS — Specifies the number of timed records that are available for a given logical PMU 1. Thelength of each record is equal to the available memory divided by the content size and number of records. As the numberof records is increased, the available storage for each record is reduced. The relay supports a maximum of 128 records ineither timed or forced mode.PMU 1 TRIGGER MODE — Specifies what happens when the recorder uses its entire available memory storage. With“Automatic Overwrite,” the last record is erased to facilitate new recording, when triggered. Under the “Protected”selection, the recorder stops creating new records when the entire memory is used up by the old uncleared records.PMU 1 TIMED TRIGGER POSITION — Specifies the amount of pre-trigger data as a percent of the entire record. This settingapplies only to the timed mode of recording.5.5.8.19 AggregatorsSETTINGS SYSTEM SETUP PHASOR MEASUREMENT UNIT PMU AGGREGATOR 1 PMU 1 RECORDING PMU 1 FUNCTION:DisabledRange: Enabled, Disabled PMU 1 NO OF TIMEDRECORDS: 10Range: 2 to 128 in steps of 1 PMU 1 TRIGGER MODE:Automatic OverwriteRange: Automatic Overwrite, Protected PMU 1 TIMED TRIGGERPOSITION: 10%Range: 1 to 50% in steps of 1 PMU AGGREGATOR 1 PMU AGGREGATOR 1PROTOCOL: NONERange: NONE, 37.118, 90-5 PMU AGGREGATOR 1IDCODE: 1Range: 1 to 65534 in steps of 1 PMU AGGREGATOR 1INCLUDE PMU1: NoRange: No, Yes
