Schweitzer Engineering Laboratories SEL-587Z - SELOGIC Control Equation Variables;Timers

4.14
SEL-587Z Instruction Manual Date Code 20020903
Control Logic
SEL
OGIC Control Equation Variables/Timers
SELOGIC Control Equation Variables/Timers
SELOGIC control equations allow the user to create customized logic in the
relay. The variables are labeled SVn (SEL
OGIC control equation variable).
Fourteen SEL
OGIC control equation variables (SV1 through SV14) are
available, 10 of which have timer outputs (SV5T through SV14T) (see
Figure 4.5). Combine the Relay Word bits to form the required logic for the
specific application.
EXAMPLE 4.7 Close Feed Pumps for Long Busbar Fault
For example, in an installation, feed pumps must be closed if a bus
fault lasts longer than 15 cycles. Select SEL
OGIC control equation
variable SV8 to monitor the differential elements and to start the
SV8T timer when any differential element asserts. Set timer pickup
SV8PU to 15 cycles; and timer dropout SV8DO to 0. When SV8T
asserts, close output OUT4, which is connected to the pumps. Enter
the following:
SV8 = 87A1 + 87B1 + 87C1 SELOGIC Variable SV8
OUT4 = SV8T Output Contact OUT4
Figure 4.5 SELOGIC Control Equation Variables/Timers.
S
V
1
S
V
2
S
V
2
S
V
3
S
V
3
S
V
4
S
V
4
S
V
1
SELOGIC Control
E
q
uation Variable/
Timer In
p
ut Settin
gs
Relay
W
o
r
d
Bi
ts
SELOGIC Control
E
q
uation Variable/
Timer In
p
ut Settin
gs
S
V
5T
S
V
5
S
V
5
S
V
6
S
V
6T
S
V
6
S
V
7
S
V7
T
S
V
7
SV5D0
SV5PU
SV6DO
SV6PU
SV7DO
SV7PU
S
V
8
S
V
8T
S
V
8
SV8DO
SV8PU
S
V
9
S
V1
0
SV9DO
SV9PU
SV10DO
SV10PU
S
V1
1
SV11DO
SV11PU
S
V1
2
SV12DO
SV12PU
S
V1
3
SV13DO
SV13PU
S
V1
4
Relay
W
o
r
d
Bi
ts
S
V
9
T
S
V
9
S
V1
0T
S
V1
0
S
V11
T
S
V1
1
S
V12
T
S
V1
2
S
V1
3T
S
V1
3
S
V14
T
S
V1
4
S
V14D
O
S
V14P
U