Technical Data; Pole Discordance Protection Ccrpld - ABB REC650 Technical Manual

Section 6
Current protection
6.8.8
6.9
136
comparator in the stub protection function STBPTOC. In a comparator the RMS
values are compared to the set operating current value of the function I>.
If a phase current is larger than the set operating current the signal from the comparator
for this phase is activated. If the fault current remains during the timer delay t, the
TRIP output signal is activated. The function can be blocked by activation of the
BLOCK input.
STUB PROTECTION FUNCTION
BLOCK
STIL1
STIL2
STIL3
RELEASE
IEC05000731 V1 EN
Figure 58: Simplified logic diagram for Stub protection

Technical data

Table 78: STBPTOC technical data
Function Range or value
Operating current (1-2500)% of
Reset ratio > 95%
Operate time 20 ms typically at 0 to 2 x I
Reset time 30 ms typically at 2 to 0 x I
Critical impulse time 10 ms typically at 0 to 2 x I
Impulse margin time 15 ms typically

Pole discordance protection CCRPLD

AND
OR
IBase
set
set
set
1MRK 511 287-UEN A
TRIP
en05000731.vsd
Accuracy
± 1.0% of I at I £ I
r r
± 1.0% of I at I > I
r
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Technical manual