'(& )( )'& &) ( &!& ")& &$(( $# Ć %&( $# #)" &&#$
4 - 38
Siemens AG ⋅ May 1998
Supervision Possible cause and response
4. Permanent monitoring of the program flow by means of
watchdog (FE, ZE)
After three unsuccessful restart attempts the protection is blokĆ
ked.
5. Cyclic test with simulation of a fault current and monitoring
of the complete signal processing from the digitized measuĆ
red values to the control of the command relay coils
after two failure detections, depending on the parameter TESTĆ
FAULT (DA 6312/ZE),, either protection blocking and/or annunĆ
ciation
6. Differential current supervision
D Bus-section specific protection
n
I i
m
I> > DIFsup.:BZ (DA 6305/ZE)
m=1
for T> T-DIFF-SUP. (DA 6304/ZE)
D Checkzone
all except bus coupler
I I> > DIFsup.:CZ (DA 6306/ZE)
m=1
forT>T-DIFF-SUP. (DA 6304/ZE)
current transformer circuit faulty
Bus-selective blocking, when parameter DIFF.SUP.BZ (DA
6307/ZE) is parameterized to blocking, otherwise only annunciaĆ
tion Id-SupSyyLx-z(FNo 96/ZE for BZ01, phase L1 and
BSZ2)
Blocking, if parameter DIFF.SUP.CZ (DA 6308/ZE) is parameteriĆ
zed to blocking, otherwise only annunciation
Id - Sup. Lx CKZ (FNr. 93; 94; 95/ZE)
7. Supervision of isolator status
D Operating position
Isolator CLOSED/OPEN = 0/0 for t > Isol Op Time (DA
6301/ZE)
D Aux. Voltage failure
All isolator positions of one bay = 0/0
D Implausible isolator status
Isolator CLOSED/OPEN = 1/1
wire breakage or faulty status
annunciation1)
ISOyFltrun:Axx (FNo. 67/ZE for ISOL. 1)
Feeder aux. voltage miniature circuit breaker tripped
annunciation1)
U-aux.flt:Axx (FNo. 86/ZE)
annunciation1)
ISOyFlt:Axx (FNo. 66/ZE for ISOL. 1)
8. Supervision of the digital input "CB failure protection "CBF
Lx" and "CBF-release"
fort>10xT-CBF (DA 6204/ZE) resp.
fort>T-CBF-RELFlt (DA 6315/ZE)
fort>T-CBF-RELSup (DA 6314/ZE)
Annunciation and blocking of the binary input of the affected
feeder CBF/BIFlt.:Lx:Ayy (FNo 9; 10; 11/ZE);
Monitoring is activated when a signal is received at the BI CBF
bay-selective for the time t> limit value;
Monitoring is activated, if not both BI CBF bay-selective and
CBF release are received within the time window t= limit value.
Annunciation and blocking of the CBF
CBF/BI-RELSup>T(FNo 12/ZE)
9. Cyclic check of the data transmission links (FO) between
master unit and bay unit
Blocking of the protection system and annunciation after two
recognitions of a transmission error.
Flt.coup.mast. (FNo 190/FE)
1) If parameter Isol Mal Resp protection block(DA 6302) is set, then
the protection is blocked.
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