Sel SEL-421 - POTT Trip Scheme; DCUB Trip Scheme

R.10.27
Date Code 20111215 Reference Manual SEL-421 Relay
Settings
Group Settings
Make Table 10.58 settings if Group setting ECOMM := POTT, POTT2,
POTT3, DCUB1, or DCUB2. Some settings are not required for every mode
(see Table 1.64 on page R.1.90, Table 1.66 on page R.1.94, and Table 1.68 on
page R.1.101 for details).
Make Table 10.59 settings if Group setting ECOMM := DCUB1 or DCUB2.
Table 10.58 POTT Trip Scheme
Label Prompt Default Value
Z3RBD Zone 3 Reverse Block Time Delay
(0.000–16000 cycles)
5.000
EBLKD Echo Block Time Delay (OFF, 0.000–16000 cycles) 10.000
ETDPU Echo Time Delay Pickup (OFF, 0.000–16000 cycles) 2.000
EDURD Echo Duration Time Delay (0.000–16000 cycles) 4.000
EWFC Weak Infeed Trip (Y, N, SP) N
27PWI Weak Infeed Phase Undervoltage Pickup
(1.0–200 V secondary)
47
27PPW Weak Infeed Phase-to-Phase Undervoltage Pickup
(1.0–300 V secondary)
80
59NW Weak Infeed Zero-Sequence Overvoltage Pickup
(1.0–200 V secondary)
5
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
Tabl e 1 0 .59 DCU B Tr ip S c he m e
Label Prompt Default Value
GARD1D Guard Present Security Delay (0.000–16000 cycles) 120.000
UBDURD DCUB Disabling Time Delay (0.000–16000 cycles) 180.000
UBEND DCUB Duration Time Delay (0.000–16000 cycles) 20.000
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