S
ETTINGS
S
HEET
Page 8
OF
22
FOR THE
SEL-311L R
ELAY
(APP = 87L21P)
Date
SEL
OGIC
C
ONTROL
E
QUATION
S
ETTINGS
(S
ERIAL
P
ORT
C
OMMAND
SET L)
Date Code 20010625
SEL
OGIC
control equation settings consist of Relay Word bits (see Tables 9.3 and 9.4) and
SEL
OGIC
control equation operators * (AND), + (OR), ! (NOT), / (rising edge), \ (falling edge),
and ( ) (parentheses). Numerous SEL
OGIC
control equation settings examples are given in
Sections 3
through
8
. SEL
OGIC
control equation settings can also be set directly to 1 (logical 1)
or 0 (logical 0).
Appendix G: Setting SEL
OGIC
Control Equations
gives SEL
OGIC
control
equation details, examples, and limitations.
Trip Logic Equations (See Figure 5.4)
Direct trip conditions
TR =
Communications-assisted trip conditions
TRCOMM =
Switch-onto-fault trip conditions
TRSOTF =
Direct transfer trip conditions
DTT =
Unlatch trip conditions
ULTR =
Communications-Assisted Trip Scheme Input Equations
Permissive trip 1 (used for ECOMM = POTT, DCUB1,
or DCUB2; see Figures 5.7, 5.9, and 5.12)
PT1 =
Loss-of-guard 1 (used for ECOMM = DCUB1 or
DCUB2; see Figure 5.12)
LOG1 =
Permissive trip 2 (used for ECOMM = DCUB2; see
Figures 5.7 and 5.12)
PT2 =
Loss of guard 2 (used for ECOMM = DCUB2; see
Figure 5.12)
LOG2 =
Block trip (used for ECOMM = DCB; see Figure 5.16)
BT =
Close Logic Equations (See Figure 6.1)
Circuit breaker status (used in Figure 5.5, also)
52A =
Close conditions (other than automatic reclosing or
CLOSE command)
CL =
Unlatch close conditions
ULCL =
Reclosing Relay Equations (See
Reclosing Relay
in
Section 6
)
Reclose initiate
79RI =
Reclose initiate supervision
79RIS =
Drive-to-lockout
79DTL =
Drive-to-last shot
79DLS =
Skip shot
79SKP =
Stall open interval timing
79STL =
Block reset timing
79BRS =
Sequence coordination
79SEQ =
Reclose supervision (see Figure 6.2)
79CLS =
Summary of Contents for SEL-311L
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