Sel 421 - Figure 5.18 METER SUBMENU

U.5.16
SEL-421 Relay User’s Guide Date Code 20090715
Front-Panel Operations
Front-Panel Menus and Screens
Figure 5.17 METER MENU Screens
Combinations of relay Global settings ESS and NUMBK give you metering
data for Line, Circuit Breaker 1, and Circuit Breaker 2 when you view
RMS
METER
, FUNDAMENTAL METER, and MAX/MIN metering screens. The relay shows
the
METER SUBMENU of Figure 5.18 so you can choose the line or circuit
breaker data that you want to display.
For example, if you have two sources feeding a transmission line through two
circuit breakers and you set ESS := 3, NUMBK := 2, then the SEL-421
measures
BREAKER 1 currents, BREAKER 2 currents, and combined (Circuit
Breakers 1 and 2) currents for
LINE. The relay displays the METER SUBMENU
screen when you make this settings configuration.
Other combinations of settings ESS and NUMBK do not require separate
circuit breaker metering screens; for these configurations, the relay does not
present the
METER SUBMENU screen. See Current and Voltage Source Selection
on page R.1.2 and Global Settings on page R.10.4 for information on
configuring global settings ESS, NUMBK, LINEI, BK1I, and BK2I.
Figure 5.18 METER SUBMENU
The relay presents the meter screens in the order shown in each column of
Figure 5.19 and Figure 5.20. Once you have selected the type of metering data
to display (
RMS METER, FUNDAMENTAL METER, DEMAND METER, ENERGY METER,
MAX/MIN, or SYNCHRONISM CHECK), you can scroll through the particular
display column by pressing the {Down Arrow} pushbutton. Return to a
previously viewed screen in each column by pressing the {Up Arrow}
pushbutton. Press {ESC} to revert the LCD screen to the
METER SUBMENU and
METER MENU screens.
The metering screens show reset options for the
MAX/MIN, ENERGY METER, PEAK
DEMAND METER
, and DEMAND METER metering quantities at the end of each
screen column. Use the {Left Arrow} and {Right Arrow} pushbuttons to select a
NO or YES response to the reset prompt, and then press {ENT} to reset the
metering quantity.
METER MENU METER MENU
Demand Meter Enabled
(EDEM := ROL or
EDEM := THM)
Synchronism Check Enabled
(E25BK1 := Y or
E25BK2 := Y)
No Synchronism Check
No Demand Metering
(E25BK1 := N)
(E25BK2 := N)
(EDEM := OFF)
RMS METER
FUNDAMENTAL METER
ENERGY METER
MAX/MIN
RMS METER
FUNDAMENTAL METER
DEMAND METER
ENERGY METER
MAX/MIN
SYNCHRONISM CHECK
NOTE: Global settings ESS (Enable
Source Selection) and NUMBK
(Number of Circuit Breakers) affect
how the SEL-421 determines the line
current and the voltage source for
protection functions (directional
elements, load encroachment, out-of-
step logic, distance element, and loss-
of-potential).
METER SUBMENU
LINE
BREAKER 1
BREAKER 2
Courtesy of NationalSwitchgear.com