Operator Controls - Schweitzer Engineering Laboratories SEL-787-2 Manual

12
Directional Power Element
Protection
The SEL-787 with optional voltage inputs provides two
directional power elements for detecting real (WATTS)
or reactive (VARS) directional power flow levels for the
transformer winding(s) associated with the three-phase
voltage input. Each directional power element has a
definite-time delay setting.

Operator Controls

Operator controls eliminate traditional panel control
switches. Eight conveniently sized operator controls,
each with two programmable tricolor LEDs, are located
on the relay front panel (see Figure 8, Figure 9, and
Figure 10). You can set the SER to track operator con-
trols. Use SEL control equations to change operator
OGIC
control functions. Use configurable labels to change all
of the text shown in Figure 8, Figure 9, and Figure 10.
SELECTED
BRKR1
CLOSED/OPEN
SELECTED
BRKR2
CLOSED/OPEN
SELECTED
BRKR3
CLOSED/OPEN
SELECTED
BRKR4
CLOSED/OPEN
Figure 8 Operator Controls (787-4X Model)
SELECTED
BRKR1
CLOSED/OPEN
SELECTED
BRKR2
CLOSED/OPEN
SELECTED
BRKR3
CLOSED/OPEN
AUX2
Figure 9 Operator Controls (787-3E/3S Models)
SEL-787-2, -3, -4 Data Sheet
RTD Thermal Protection
When the SEL-787 is equipped with either an optional
10 RTD input expansion card or an external SEL-2600
RTD Module with as many as 12 RTD inputs, you can
program as many as 12 thermal elements in the relay for
two levels of thermal protection per element. Each RTD
input provides an alarm and trip thermal pickup setting in
degrees Celsius, open and shorted RTD detection, and is
compatible with the following three-wire RTD types:
PT100 (100  platinum)
➤
NI100 (100  nickel)
➤
NI120 (120  nickel)
➤
CU10 (10  copper)
➤
ENABLED
LOCK
DISABLED
BREAKER CLOSING
CLOSE
Figure 10 Operator Controls (787-2E/21/2X Models)
The following operator control descriptions are for
BREAKER OPENING
factory-set logic.
TRIP
LOCK: The LOCK operator control blocks selected
functions. Press it for at least three seconds to engage or
AUX1
disengage the lock function. When the LOCK pushbutton
is engaged, the CLOSE operator control is blocked.
BRKRn: Each of the BRKRn (n = 1, 2, 3, or 4) pushbuttons
allows you to select the breaker on which a close or trip
control operation is to be performed. Only one breaker
ENABLED
LOCK
can be selected at any given time. Breaker select status
DISABLED
for a given breaker is indicated by the upper pushbutton
LED. The lower pushbutton LED indicates the
BREAKER CLOSING
CLOSED/OPEN (RED/GREEN, respectively) status of
CLOSE
the corresponding breaker.
CLOSE and TRIP: Use the CLOSE and TRIP operator controls
BREAKER OPENING
TRIP
to close and open the circuit breaker. You can program
these controls with intentional time delays to support
operational requirements for breaker-mounted relays.
This allows you to press the CLOSE or TRIP pushbutton,
AUX1
then move to an alternate location before the breaker
command is executed.
SELECTED
BRKR1
CLOSED/OPEN
SELECTED
BRKR2
CLOSED/OPEN
SELECTED
AUX2
CLOSED/OPEN
AUX3
Schweitzer Engineering Laboratories, Inc.
ENABLED
LOCK
DISABLED
BREAKER CLOSING
CLOSE
BREAKER OPENING
TRIP
AUX1