Sel 411L - Page 764

P.12.4
SEL-411L Relay Protection Manual Date Code 20151029
Bay Control
Disconnect Logic
89CRSm, 89ORSm
The 89CRSm and 89ORSm SELOGIC control equations provide the flexibility
to select what signals to reset the close (89CLSm) or open (89OPEm) outputs.
89CRSm defaults to (89CLm OR 89CSIm), and 89ORSm defaults to
(89OPNm OR 89OSIm).
89CSIDm, 89OSIDm
Set 89CSTm and 89OSTm to seal in the open and close signals for each
individual installation. Relay Word bits 89CSIm and 89OSIm are the outputs
of the close and open seal-in timers, and assert after the appropriate timers
expires. By default, 89CSIm and 89OSIm are used in the 89CRSm and
89ORSm SEL
OGIC control equations to reset the close and open signals,
89CLSm and 89OPEm, that drive the disconnect switch motor.
89CLm, 89OPNm
The 89CLm and 89OPNm Relay Word bits report the state of the disconnect
switches. If the disconnect switch is closed, Relay Word bit 89CLm is
asserted; if the disconnect switch is open, Relay Word bit 89OPNm is
asserted. See Figure 12.3 for a description of these inputs. With the default
settings, when Relay Word bit 89CLm asserts, the close seal-in circuit output
is blocked, causing 89CLSm to deassert. Likewise, with the default settings,
when Relay Word bit 89OPNm asserts, the open seal-in circuit output is
blocked, causing 89OPEm to deassert.
89ALm
The disconnect switch status and alarm logic in Figure 12.3 generates the
89ALm Relay Word bit. When Relay Word bit 89ALm asserts, it blocks the
seal-in circuits, deasserting the 89CLSm/89OPEm signals.
LOCAL
The LOCAL Relay Word bit asserts when LOCAL SELOGIC control equation
asserts to a logical 1. When the LOCAL Relay Word bit asserts, only the HMI
commands (89CCMm and 89OCMm) can initiate close and open operations.
When the LOCAL Relay Word bit is deasserted, the 89CC, 89OC, SEL
OGIC
disconnect close/open, and Fast Operate disconnect CLOSE/OPEN
commands can perform disconnect close and open operations.
Disconnect Switch Close and Open Control Logic Action Inputs
89CCNm, 89OCNm
89CCNm and 89OCNm SELOGIC control equations are for programmable
close and open disconnect switch operations. The LOCAL Relay Word bit
must be deasserted for the close or open SEL
OGIC equations to initiate a
disconnect switch operation. Use care when using SEL
OGIC control equations
for disconnect switch operations; this disconnect operate method is not
supervised by the breaker jumper or appropriate relay access levels as is the
case with other disconnect operation methods.
89CCMm, 89OCMm
89CCMm and 89OCMm Relay Word bits pulse for one-quarter cycle when
close or open disconnect operations are initiated from the one-line diagram on
the front-panel screen. If the LOCAL Relay Word bit is not asserted, then
Relay Word bits 89CCMm or 89OCMm cannot assert.