4.3
Date Code 20171021 Instruction Manual SEL-421 Relay
Front-Panel Operations
Front-Panel Menus and Screens
The active alarm points are the first screens in the ROTATING DISPLAY (see Alarm
Points on page 4.7 in the SEL-400 Series Relays Instruction Manual). Each alarm
points screen shows as many as eleven alarm conditions. The SEL-421 can pres-
ent a maximum of six alarm points screens.
The active display points are the next screens in the
ROTATING DISPLAY (see Dis-
play Points on page 4.10 in the SEL-400 Series Relays Instruction Manual). Each
display points screen shows as many as 11 enabled display points. (With 96 dis-
play points, the SEL-421 can present a maximum of 9 display points screens.) If
a display point does not have text to display, the screen space for that display
point is maintained.
Front-Panel Menus and Screens
Operate the SEL-421 front panel through a sequence of menus that you view on
the front-panel display. The
MAIN MENU is the introductory menu for other front-
panel menus. These additional menus allow you on-site access to metering, con-
Figure 4.1 Sample ROTATING DISPLAY
*Circuit BK1 SF6 Gas
ROTATING DISPLAY
Press for menu
Circuit Breaker 1
--Closed--
ROTATING DISPLAY
Press for menu
Circuit BK1 SF6 Gas
--Alarm--
Circuit Breaker 2
A PH= 119.6 A pri
SF6 ALARM
Line Current (A) RMS
IA =
119.6
IB =
119.7
IC =
119.5
FREQ = 60.00 Hz
ROTATING DISPLAY
Press for menu
Line Quantities FUND
ROTATING DISPLAY
Press for menu
Voltage (kV)
VA = 130.4 + 6°
VB = 130.3 -114°
VC = 130.5 -126°
Current (A)
IA = 119.6 35°
IB = 119.7 -95°
IC = 119.5 155°
FREQ = 60.00 Hz
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