5.2
SEL-311C Relay Instruction Manual Date Code 20060320
Trip and Target Logic
Trip Logic
More than one trip setting (or all four trip settings TRCOMM, DTT, TRSOTF,
and TR) can be set. For example, in a communications-assisted trip scheme,
TRCOMM is set with direction forward overreaching Zone 2 distance
elements, TR is set with direction forward underreaching Zone 1 distance
elements and other time-delayed elements (e.g., Zone 2 definite-time distance
elements), and TRSOTF is set with instantaneous directional and
nondirectional elements.
q From Figure 5.7; w from Figure 5.6; e from Figure 5.11; r from Figure 5.14; t from Figure 5.3.
Figure 5.1 Trip Logic
ULTR Unlatch Trip Conditions.
TDURD Minimum Trip Duration Time.
This timer establishes the minimum time duration for
which the TRIP Relay Word bit asserts. The settable
range for this timer is 2–16,000 cycles. See Figure 5.2.
Trip
Seal-in
and
Unlatch
Logic
"Other Trips"
Trip Logic
t Switch-Onto-
Fault Trip Logic
Communications-
Assisted
Trip Logic
Communications-
Assisted Trip
Unlatch Trip
ULTR
Other Trips
TR
Switch-Onto-Fault Trip
TRSOTF
SOTFE
ECOMM = DCUB1
Direct Transfer Trip
Echo Conversion to Trip
DTT
TRCOMM
TRIP
Serial Port
Command
{TARGET
RESET}
Pushbutton
TAR R
w ECTT
r BTX
r DSTRT
e UBB
w Z3RB
q PTRX
ECOMM = DCB
ECOMM = DCUB2
ECOMM = POTT
Rising Edge
Detect
Minimum Trip
Duration Timer
SOTFT
0
TDURD
SELOGIC
Trip
Settings
SELOGIC
Trip
Settings
SELOGIC
Trip
Setting
SELOGIC
Setting
ECOMM
Settings
OR-2
OR-1
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bit
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