U.5.18
SEL-421 Relay User’s Guide Date Code 20090715
Front-Panel Operations
Front-Panel Menus and Screens
Figure 5.20 ENERGY, MAX/MIN, and SYNCH CHECK Metering Screens
Events
The SEL-421 front panel features summary event reporting, which simplifies
post-fault analysis. These summary event reports include all trip events, event
and data capture triggering (via the ER SEL
OGIC control equation), and
manual triggers. The relay displays event reports based on the Relay Word bit
elements in the ER (event report trigger) SEL
OGIC control equation. See Event
Report on page A.3.12 for more information on event reports.
The front-panel event buffer size is 100 summaries. The relay numbers
summary events in order from 10000 through 42767 and displays the most
recent summaries on the LCD.
LINE METERING
VPM = xxx.xxx V
BREAKER 1
NVS1M = xxx.xxx V
ANGLE1 = +xxx.xxx ˚
SLIP1 = xx.xxx Hz
SYNCH CHECK
BREAKER 2
NVS2M = xxx.xxx V
ANGLE2 = +xxx.xxx ˚
SLIP2 = xx.xxx Hz
ENERGY IN (MWh)
A = xx xxx.xx
B = xx xxx.xx
C = xx xxx.xx
3P = xx xxx.xx
ENERGY OUT (MWh)
A = xx xxx.xx
B = xx xxx.xx
C = xx xxx.xx
3P = xx xxx.xx
ENERGY METER
ENERGY TOTAL (MWh)
A = xx xxx.xx
B = xx xxx.xx
C = xx xxx.xx
3P = xx xxx.xx
ENERGY METER
RESET ENERGY NOW?
NO YES
LAST ENERGY RESET:
MM/DD/YYYY HH:MM:SS
CURRENTS (A)
IA MAX = xx xxx.x
MIN = xx xxx.x
IB MAX = xx xxx.x
MIN = xx xxx.x
IC MAX = xx xxx.x
MIN = xx xxx.x
I1 MAX = xx xxx.x
3I2 MAX = xx xxx.x
3I0 MAX = xx xxx.x
MAX/MIN LINE
BREAKER METERING
ACTIVE POWER (MW)
3P MAX = xx xxx.x
MIN = xx xxx.x
MAX/MIN LINE
FREQUENCY (Hz)
MAX = xx.xx
MIN = xx.xx
MAX/MIN LINE
REACTIVE (MVAR)
3P MAX = xx xxx.x
MIN = xx xxx.x
APPARENT POWER (MVA)
3P MAX = xx xxx.x
MIN = xx xxx.x
NO YES
RESET MAX/MIN NOW?
CURRENTS (A)
IA MAX = xx xxx.x
MIN = xx xxx.x
MAX/MIN BREAKER n
LAST MAX/MIN RESET:
MM/DD/YYYY HH:MM:SS
MAX/MIN BREAKER n
IB MAX = xx xxx.x
MIN = xx xxx.x
IC MAX = xx xxx.x
MIN = xx xxx.x
NO YES
RESET MAX/MIN NOW?
LAST MAX/MIN RESET:
MM/DD/YYYY HH:MM:SS
n = 1 or 2, representing Circuit
Breaker 1 or Circuit Breaker 2,
respectively.
Courtesy of NationalSwitchgear.com
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