Sel 411L - Table 3.122 DCUB Relay Word Bits

P.3.234
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Directional Comparison Unblocking Scheme Logic
Timer Setting
Recommendations
GARD1D: Guard-Present Delay
This timer determines the minimum time before the relay reinstates
permissive tripping following a loss-of-channel condition. Channel 1 and
Channel 2 logic use separate timers but have this same delay setting.
UBDURD: DCUB Disable Delay
This timer prevents high-speed tripping via the POTT scheme logic after a
settable time following a loss-of-channel condition; a typical setting is nine
cycles. Channel 1 and Channel 2 logic use separate timers but have this same
delay setting.
UBEND: DCUB Duration Delay
This timer determines the minimum time before the relay declares a loss-of-
channel condition; a typical setting is 0.5 cycles. Channel 1 and Channel 2
logic use separate timers but have this same delay setting.
GARD1D
c
Guard present security delay (cycles) 0.000–16000 120.000
UBDURD
c
DCUB disabling time delay (cycles) 0.000–16000 180.000
UBEND
c
DCUB duration time delay (cycles) 0.000–16000 20.000
PT2
c
Channel 2 permissive trip received SELOGIC equation NA
LOG1 Channel 1 loss-of-guard SEL
OGIC equation NA
LOG2
c
Channel 2 loss-of-guard SELOGIC equation NA
a
Make setting when EWFC := SP.
b
Make setting when EWFC := Y or SP.
c
Make setting when ECOMM := DCUB2 or DCUB1.
Table 3.121 DCUB Settings (Sheet 2 of 2)
Setting Description Range
Default
(5 A)
Table 3.122 DCUB Relay Word Bits
Name Description
UBB1 Block permissive trip on Receiver 1
PTRX1 Permissive trip received on Channel 1
UBB2 Block permissive trip on Receiver 2
PTXR2 Permissive trip received on Channel 2
UBB Block permissive trip received on Channel 1 or Channel 2
PTRX Permissive trip received on Channel 1 and Channel 2