Date Code 20020129
Setting the Relay
6-7
SEL-387E Instruction Manual
to the external or internal trip counter, depending on whether the associated TRIP variable was
asserted at time of triggering.
In addition, for each breaker there is a contact wear curve, defined by entering three operations
versus current coordinate pairs. This curve is applied by pole, to track and alarm when excessive
contact wear is encountered. This helps the user to schedule breaker maintenance intervals.
Analog Input Labels
In the Global setting area the user is permitted to rename the 12 analog current inputs to suit
local preferences. The present names, IAW1 through VWCX, can be replaced with other
designations of not more than four characters. This function recognizes the desire of users to
replace SEL designations with more familiar phase identifiers, such as “R, S, T,” “Red, Blue,
Yellow,” and so forth.
The new labels will appear wherever the currents were identified by the existing labels, including
the displays for serial port commands
STATUS
(
STA
),
BREAKER
(
BRE
),
EVENT
(
EVE
),
and
METER
(
MET
), including the variants of each command. The new labels will also appear
in the front-panel LCDs for the STATUS and METER pushbutton menus.
Front-Panel Displays
Fault type targets A, B, and C can be redefined using SEL
OGIC
control equations LEDA, LEDB,
and LEDC, respectively.
There are 16 programmable Display Points, for creating customized messages on the LCD. They
appear in pairs and stay on screen for two seconds before scrolling to the next display. The
variables DP1 through DP16 are defined by a SEL
OGIC
control equation that at any time will
have a logical value of 0 or 1. For each DPm there are two settings showing the display content.
These are DPm_1 and DPm_0. The relay displays any nonblank DPm_1 or _0 values if the
current logical value of DPm corresponds. The LED and Display Point settings are Global
settings, accessible with the
SET G
command from a communications port.
For more information on the LEDs and Display Points, see
Section 8: Front-Panel Interface.
Sequential Events Reporting
The SER, or Sequential Events Recorder, lists up to 512 events. This listing may help the user
determine within a short time interval the correct order of operation during a complicated event
with multiple device operations. The settings for the SER are the trigger conditions and the
Relay Word bit ALIAS names. As many as 96 total Relay Word bit names may be selected and
entered into settings SER1, SER2, SER3, and SER4 in any order, with a maximum of 24 bits in
any SERn. As many as 20 Relay Word bits may be given ALIAS names, to make the SER report
more user friendly. For example, a given input may be given an ALIAS that designates a 52a
input for a specific named breaker.
The SER settings are made after issuing the
SET R
command from a communications port. The
SER operation and settings are described fully in
Section 9: Event Reports and Sequential
Events Reporting.
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