8.27
Date Code 20171021 Instruction Manual SEL-421 Relay
Settings
Group Settings
Make Table 8.67 settings if Group setting ECOMM := POTT, POTT2, POTT3,
DCUB1, or DCUB2. Some settings are not required for every mode (see
Table 5.70 on page 5.123, Table 5.72 on page 5.127, and Table 5.74 on
page 5.134 for details).
NOTE: If the relay is using a remote
data acquisition system, such as TiDL,
the operating times will be delayed by
1.5 ms. Use caution when setting the
relay coordination times to account
for this added delay.
Make Table 8.68 settings if Group setting ECOMM := DCUB1 or DCUB2.
NOTE: If the relay is using a remote
data acquisition system, such as TiDL,
the operating times will be delayed by
1.5 ms. Use caution when setting the
relay coordination times to account
for this added delay.
Ta b l e 8 .67 POT T Trip Sc h e m e
Setting Prompt
Default
Value
Increment
Z3RBD Zone 3 Reverse Block Time Delay
(0.000–16000 cycles)
5.000 0.125
EBLKD Echo Block Time Delay (OFF, 0.000–16000 cycles) 10.000 0.125
ETDPU Echo Time Delay Pickup (OFF, 0.000–16000 cycles) 2.000 0.125
EDURD Echo Duration Time Delay (0.000–16000 cycles) 4.000 0.125
EWFC Weak Infeed Trip (Y, N, SP) N
27PWI Weak Infeed Phase Undervoltage Pickup
(1.0–200 V secondary)
47 0.1
27PPW Weak Infeed Phase-to-Phase Undervoltage Pickup
(1.0–300 V secondary)
80 0.1
59NW Weak Infeed Zero-Sequence Overvoltage Pickup
(1.0–200 V secondary)
50.1
PT1 General Permissive Trip Received
(SEL
OGIC Equation)
IN102
AND
PLT02
PT3 Three-Pole Permissive Trip Received
(SEL
OGIC Equation)
NA
PTA A-Phase Permissive Trip Received
(SEL
OGIC Equation)
NA
PTB B-Phase Permissive Trip Received
(SEL
OGIC Equation)
NA
PTC C-Phase Permissive Trip Received
(SEL
OGIC Equation)
NA
EPTDIR Enable Directional Element Permissive Trip (Y, N) N
PTDIR Dir. Ele. Permissive Trip Recvd (SELOGIC Equation) NA
COMZDTC Dir. Ele. Comm.-Assisted Trip Enable (SEL
OGIC
Equation)
NA
Ta b l e 8 .6 8 DCUB Tr i p Sche m e
Setting Prompt
Default
Value
Increment
GARD1D Guard Present Security Delay (0.000–16000 cycles) 120.000 0.125
UBDURD DCUB Disabling Time Delay (0.000–16000 cycles) 180.000 0.125
UBEND DCUB Duration Time Delay (0.000–16000 cycles) 20.000 0.125
PT2 Channel 2 Permissive Trip Received (SEL
OGIC Equation) NA
LOG1 Channel 1 Loss-of-Guard (SEL
OGIC Equation) NA
LOG2 Channel 2 Loss-of-Guard (SEL
OGIC Equation) NA
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