CHAPTER 6: ACTUAL VALUES A3 EVENT RECORDER
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–19
The event record runs continuously, capturing and storing conditions present at the
moment of occurrence of the last 256 events, as well as the time and date of each event.
The header message for each event contains two pieces of information: the event number
(higher numbers denote more recent events) and the event date. If the event record is clear
or if the date has never been programmed, “Unavailable” is displayed instead of a date. No
more than 256 events are stored at the same time.
Pickup events are not recorded for elements that operate instantaneously (for example,
percent differential, instantaneous differential, etc.). Also, elements that have operate
times set to 0.00 seconds will not log pickup events. If the operate delay is set higher than
0.00, then the event recorder logs both the pickup and the operate events.
Test Mode 2 event is recorded for serial port command, using DNP protocol, to perform
cold restart. Test Mode 3 event is recorded for serial port command to perform firmware
upload.
Diagnostic message 1 is caused when 745 detects transients inside the 745, or when the
745 is affected by signalling faults on RS485.
Table 6–1: Types and causes of events
PICKUP / OPERATE / DROPOUT Events
Percent Differential Inst Differential W1 Phase Time OC
W2 Phase Time OC W3 Phase Time OC W1 Phase Inst OC 1
W2 Phase Inst OC 1 W3 Phase Inst OC 1 W1 Phase Inst OC 2
W2 Phase Inst OC 2 W3 Phase Inst OC 2 W1 Neutral Time OC
W2 Neutral Time OC W3 Neutral Time OC W1 Neutral Inst OC 1
W2 Neutral Inst OC 1 W3 Neutral Inst OC 1 W1 Neutral Inst OC 2
W2 Neutral Inst OC 2 W3 Neutral Inst OC 2 W1 Ground Time OC
W2 Ground Time OC W3 Ground Time OC W1 Ground Inst OC 1
W2 Ground Inst OC 1 W3 Ground Inst OC 1 W1 Ground Inst OC 2
W2 Ground Inst OC 2 W3 Ground Inst OC 2 W1 Restd Gnd Fault
W2 Restd Gnd Fault W3 Restd Gnd Fault W1 Neg Seq Time OC
W2 Neg Seq Time OC W3 Neg Seq Time OC W1 Neg Seq Inst OC
W2 Neg Seq Inst OC W3 Neg Seq Inst OC Underfrequency 1
Underfrequency 2 Frequency Decay 1 Frequency Decay 2
Frequency Decay 3 Frequency Decay 4 Overfrequency
5th Harmonic Level Volts-Per-Hertz 1 Volts-Per-Hertz 2
W1 THD Level W2 THD Level W3 THD Level
W1 Harmonic Derating W2 Harmonic Derating W3 Harmonic Derating
Analog Level 1 Analog Level 2 W1 Current Demand
W2 Current Demand W3 Current Demand Transformer Overload
ON/OFF events
Logic Input 1 Logic Input 2 Logic Input 3
Logic Input 4 Logic Input 5 Logic Input 6
Logic Input 7 Logic Input 8 Logic Input 9
Logic Input 10 Logic Input 11 Logic Input 12
Logic Input 13 Logic Input 14 Logic Input 15
Logic Input 16 Virtual Input 1 Virtual Input 2
Virtual Input 3 Virtual Input 4 Virtual Input 5
Virtual Input 6 Virtual Input 7 Virtual Input 8
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