9.5
Date Code 20081022 Instruction Manual SEL-787 Relay
Analyzing Events
Event Reporting
The Voltage Mag fields display the primary voltage magnitudes at the instant
the TRIP Relay Word bit asserts or the ER equation asserts. The voltages
displayed are listed below:
➤ DELTA_Y := WYE
➢ Phase-to-Neutral Voltages (VAN, VBN, VCN)
➢ Residual Voltage VG, calculated from VAN, VBN, VCN
➤ DELTA_Y := DELTA
➢ Phase-to-Phase Voltages (VAB, VBC, VCA)
If the RTDs are connected, the hottest RTD (°C) fields display the hottest RTD
reading in each RTD group. The hottest RTD temperatures in degrees
centigrade (°C) are listed below:
➤ Ambient
➤ Other
Event History
The event history report gives you a quick look at recent relay activity. The
relay labels each new event in reverse chronological order with
1 as the most
recent event. See Figure 9.2 for a sample event history. Use this report to view
the events that are presently stored in the SEL-787.
The event history contains the following:
➤ Standard report header
➢ Relay and terminal identification
➢ Date and time of report
➢ Time source (Internal or IRIG-B)
➤ Event number, date, time, event type (see Table 9.1)
➤ Maximum current
➤ Frequency (actual frequency if voltage card is available
otherwise the nominal frequency)
➤ Target LED status
Figure 9.2 Sample Event History
Viewing the Event History
Access the history report from the communications ports, using the HIS
command or the analysis menu within
ACSELERATOR
®
QuickSet
®
SEL-5030
software. View and download history reports from Access Level 1 and higher.
Use the HIS command from a terminal to obtain the event history. You can
specify the number of the most recent events that the relay returns. See
HISTORY Command on page 7.23 for information on the HIS command.
=>>HIS <Enter>
SEL-787 Date: 02/14/2008 Time: 13:25:12
TRNSFRMR RELAY Time Source: Internal
FID = SEL-787-X122HR-V0-Z001001-D20080212
# DATE TIME EVENT CURRENT FREQ TARGETS
1 02/14/2008 13:09:57.353 Diff 87 Trip 2144.4 60.0 11100000
=>>
Event
Number
Event Type Maximum
Current
Frequency
User-Defined
Target LEDs
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