4.8
SEL-421 Relay Instruction Manual Date Code 20171021
Front-Panel Operations
Front-Panel Menus and Screens
Breaker Monitor
The SEL-421 features an advanced circuit breaker monitor. Select BREAKER MON-
ITOR
screens from the MAIN MENU to view circuit breaker monitor alarm data on
the front-panel display.
Figure 4.7 shows sample breaker monitor display screens. The
BKR n ALARM
COUNTER
screen displays the number of times the circuit breaker exceeded certain
alarm thresholds (see Circuit Breaker Monitor on page 7.7).
If you have two circuit breakers and have set NUMBK := 2, the alarm submenu
in Figure 4.7 appears first. Use the navigation pushbuttons to choose either
Cir-
cuit Breaker 1
or Circuit Breaker 2. Press ENT to view the selected circuit
breaker monitor information. An example of the
Circuit Breaker 1 ALARM
COUNTER
screen for a single-pole tripping circuit breaker is shown on the right
side of Figure 4.7.
View Configuration
You can use the front panel to view detailed information about the configuration
of the firmware and hardware components in the SEL-421 Relay. In the
MAIN
MENU
, highlight the VIEW CONFIGURATION option by using the navigation pushbut-
tons. The relay presents four screens in the order shown in Figure 4.8. Use the
navigation pushbuttons to scroll through these screens. When finished viewing
these screens, press ESC to return to the
MAIN MENU.
Figure 4.6 EVENT SUMMARY Screens
03/15/2001 GROUP 1
00:00:05.387
EVENT: 87A REF
FREQUENCY: 60.54
EVENT SUMMARY 10002
TARGETS:
COMM
ZONE 2
PHASE B
PHASE C
GROUND
50
EVENT SUMMARY 10002
TARGETS:
COMM
ZONE 2
PHASE B
PHASE C
GROUND
50
EVENT SUMMARY 10002
FAULT QUANTITIES
(kV/A)
VA = 131 0.7°
VB = 113 -123.4°
VC = 113 124.7°
IA = 200 -0.5°
IB = 2478 172.3°
IC = 2480 6.7°
IG = 212 -11.3°
EVENT SUMMARY 10002
Figure 4.7 BREAKER MONITOR Report Screens
BREAKER 1
BREAKER 2
BKR ALARM SUBMENU
BKR 1 ALARM COUNTER
ALARM COUNT
MECH. OP. TIME 0
ELEC. OP. TIME 0
BKR INACTIVITY 0
POLE SCATTER 0
POLE DISCREPANCY 0
MOTOR RUNTIME 0
CURRENT
INTERRUPTED 0
LAST RESET:
03/15/2001 00:01:00
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