P.7.38
SEL-411L Relay Protection Manual Date Code 20151029
Front-Panel Operations
Operation and Target LEDs
remain present at the relay inputs. If the trip conditions have cleared, the
latched target LEDs turn off. If the trip event conditions remain, the relay re-
illuminates the corresponding target LEDs. The TARGET RESET pushbutton also
removes the trip automatic message displayed on the LCD menu screens if the
trip conditions have cleared.
Lamp Test Function With TARGET RESET
The TARGET RESET pushbutton also provides a front-panel lamp test. Pressing
TARGET RESET illuminates all the front-panel LEDs, and these LEDs remain
illuminated for as long as you press TARGET RESET. The target LEDs return to a
normal operational state after you release the TARGET RESET pushbutton.
Lamp Test Function With LCD DISPLAY TEST Menu
The LCD menus provide a front-panel DISPLAY TEST mode. This menu-
activated lamp test, from the
DISPLAY TEST menu, does not reset the target
LEDs (see Display Test).
Other Target Reset Options
You can reset the target LEDs with the ASCII command TAR R; see TARGET
on page P.15.56 for more information.
The TAR R command and the TARGET RESET pushbutton also control the
TRGTR Relay Word bit, which can be used for other functions. TRGTR is the
factory default setting for the unlatch trip SEL
OGIC control equation, ULTR,
in group settings.
You can reset the targets from the
ACSELERATOR QuickSet Control branch of
the HMI tree view. Programming specific conditions in the SEL
OGIC control
equation RSTTRGT is another method to reset the relay targets. Access
RSTTRGT in the relay Global settings (Data Reset Control); to use
RSTTRGT, you must enable data reset control with Global setting
EDRSTC := Y.
Trip Type
The relay indicates essential information about the most recent relay trip event
with the LEDs of the Trip Type area. These trip types are INST, TIME, COMM, and
SOTF.
The INST target LED illuminates, indicating operation of the instantaneous
elements. This LED lights if elements Z1P (the Zone 1 mho phase distance
element), Z1G (the Zone 1 mho ground distance element), or 87OP (current
differential elements) pick up and the relay has not illuminated the COMM or
SOTF targets.
The TIME target LED indicates that a timed relay element caused a relay trip.
Table 7.12 lists the elements that activate the TIME LED in the factory default
settings.
Ta b l e 7.1 2 T I M E Ta rg e t L E D Tr i g g e r E le m e n ts— Fa c t o r y D e fa u l t s
Mho/Quadrilateral
Z2GT, Z2PT
Z3GT, Z3PT
Z4GT, Z4PT
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