BLOCK
TRIP
STUB PROTECTION FUNCTION
PU_A
PU_B
PU_C
OR
AND
ENABLE
en05000731_ansi.vsd
ANSI05000731 V1 EN-US
Figure 283: Simplified logic diagram for Stub protection (50STB)
8.9.8 Technical data
M12350-1 v11
Table 269: STBPTOC (50STB) technical data
Function Range or value Accuracy
Operating current (5-2500)% of
IBase
±1.0% of I
n
at I ≤ I
n
±1.0% of I at I > I
n
Reset ratio > 95% at (50-2500)% of
IBase
-
Independent time delay at 0 to 2 x I
set
(0.000-60.000) s
±0.2% or ±30 ms
whichever is greater
Trip time, pickup at 0 to 2 x I
set
Min. = 10 ms
Max. = 20 ms
-
Reset time, pickup at 2 to 0 x I
set
Min. = 10 ms
Max. = 20 ms
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Impulse margin time 15 ms typically -
8.10 Pole discrepancy protection CCPDSC(52PD)
IP14516-1 v5
Section 8 1MRK 502 066-UUS B
Current protection
536
Technical manual
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