GE 745 Instruction Manual page 227

CHAPTER 6: ACTUAL VALUES
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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
Percent Differential
W2 Phase Time OC
W2 Phase Inst OC 1
W2 Phase Inst OC 2
W2 Neutral Time OC
W2 Neutral Inst OC 1
W2 Neutral Inst OC 2
W2 Ground Time OC
W2 Ground Inst OC 1
W2 Ground Inst OC 2
W2 Restd Gnd Fault
W2 Neg Seq Time OC
W2 Neg Seq Inst OC
Underfrequency 2
Frequency Decay 3
5th Harmonic Level
W1 THD Level
W1 Harmonic Derating
Analog Level 1
W2 Current Demand
Logic Input 1
Logic Input 4
Logic Input 7
Logic Input 10
Logic Input 13
Logic Input 16
Virtual Input 3
Virtual Input 6
PICKUP / OPERATE / DROPOUT Events
Inst Differential
W3 Phase Time OC
W3 Phase Inst OC 1
W3 Phase Inst OC 2
W3 Neutral Time OC
W3 Neutral Inst OC 1
W3 Neutral Inst OC 2
W3 Ground Time OC
W3 Ground Inst OC 1
W3 Ground Inst OC 2
W3 Restd Gnd Fault
W3 Neg Seq Time OC
W3 Neg Seq Inst OC
Frequency Decay 1
Frequency Decay 4
Volts-Per-Hertz 1
W2 THD Level
W2 Harmonic Derating
Analog Level 2
W3 Current Demand
ON/OFF events
Logic Input 2
Logic Input 5
Logic Input 8
Logic Input 11
Logic Input 14
Virtual Input 1
Virtual Input 4
Virtual Input 7
A3 EVENT RECORDER
W1 Phase Time OC
W1 Phase Inst OC 1
W1 Phase Inst OC 2
W1 Neutral Time OC
W1 Neutral Inst OC 1
W1 Neutral Inst OC 2
W1 Ground Time OC
W1 Ground Inst OC 1
W1 Ground Inst OC 2
W1 Restd Gnd Fault
W1 Neg Seq Time OC
W1 Neg Seq Inst OC
Underfrequency 1
Frequency Decay 2
Overfrequency
Volts-Per-Hertz 2
W3 THD Level
W3 Harmonic Derating
W1 Current Demand
Transformer Overload
Logic Input 3
Logic Input 6
Logic Input 9
Logic Input 12
Logic Input 15
Virtual Input 2
Virtual Input 5
Virtual Input 8
6–19