Sel 411L - Page 583

P.7.15
Date Code 20151029 Protection Manual SEL-411L Relay
Front-Panel Operations
Front-Panel Menus and Screens
NOTE: Global settings ESS (Enable
Source Selection) and NUMBK
(Number of Circuit Breakers) affect
how the relay 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).
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 7.17 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 relay 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 P.3.106 and Global Settings on page P.5.4 for information on
configuring Global settings ESS, NUMBK, LINEI, BK1I, and BK2I.
Figure 7.17 METER SUBMENU
The relay presents the meter screens in the order shown in each column of
Figure 7.18 and Figure 7.19. 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 SUBMENU
LINE
BREAKER 1
BREAKER 2