OR
AND
RSFF
S
R
Q
AR_ZE
START_ L1L2L3
BI T_TRIP_ZE
ZE_FOR_DIST
18000022-IEC19000424-1-en.vsdx
IEC19000424 V1 EN-US
Figure 23: ZE segment
Table 55: Signals ZE (see above diagram)
Signal
In
Out
Source
Drain
ZE_FR_DIST
X
Binary input: ZExtension
AR_ZE
X
Binary input: ZExtensionAR
START_L1L2L3
X
Binary signal: Start L1+L2+L3
BIT_TRIP_ZE
X
Internal signal to trip logic
(TRIP3)
Communication channel failure (UNBLOCK)
GUID-EB4943D5-5BA6-473A-BCB0-FB8B294A3B96 v1
This logic is only used in conjunction with a permissive underreaching transfer tripping
scheme (PUTT OR2) or a permissive overreaching transfer tripping scheme (POTT).
The logic causes the communication channel failure signal from the communication
equipment (optocoupler input Com Fail) to be interpreted as a receive signal for 100 ms. This
enables tripping [BIT_UNBL] to take place in PUTT OR2 or POTT schemes in cases where the
PLC receive signal is attenuated by the primary system fault on the line.
AND
20
20
AND
P UNBLOCK
HFREC
HFFAIL
BI T_UNBL
180000023-IEC19000425-1-en.vsdx
IEC19000425 V1 EN-US
Figure 24: UNBLOCK segment
Table 56: Signals UNBLOCK (see above diagram)
Signal
In
Out
Source
Drain
P_UNBLOCK
X
Setting: Unblock
On = 1; Off = 0
HFREC
X
Binary input: Com Rec
HFFAIL
X
Binary signal: Com Fail
BIT_UNBL
X
Internal signal to the POTT
or PUTT logic.
Section 5
1MRK 505 406-UEN B
Bay protection functions
72
Bay protection functions REB500
Technical manual
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