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Siemens AG ⋅ May 1998
4.7.8.4 Isolator supervision
The isolator switching positions are recorded as
OPEN or CLOSED. The following faulty conditions
can arise from these positions:
Isolator CLOSED/OPEN=1/1 :
Isolator status
Annunciation: Isy Flt: Axx (FNo
66; 70; 74; 78; 82/ZE)
Isolator CLOSED/OPEN=0/0 :
If this status is signalled for more
than one isolator in the same bay,
then auxiliary voltage failure is anĆ
nunciated for this bay.
Annunciation: Aux. Volt. Fail: Axx
(FNo 86/ZE)
If this status is signalled for only
one isolator per bay, then exceeĆ
ding of the isolator running time is
assumed and isolator faulty alarm
is issued:
Annunciation: "Isoy Fltrun:Axx"
(FNo 67; 71; 75; 79; 83/ZE)
y: Isolator designation
xx: Feeder no.
The treatment of the isolator mal-function positions is
described in Section 4.5.
4.7.8.5 Supervision of CB failure protection
initiation and release
If a binary input "start CBF" (FNr. 7020 to 7022/FE)is
energized incorrectly, there is a risk of spurious tripĆ
ping of a busbar in this feeder on acount of the inverĆ
ted current.
Following monitoring functions can be performed, set
by parameters(CBF-BI-MODE DA 6201/ZE).
D If the selective CBF-initiation persists longer than
10 x T-CBF (DA 6204/ZE) , then the faulty CBF
input is blocked and annunciated (CBF/
BIFlt:Lx:Ayy).
D If the CBF release signal persists longer than
T-CBF-RELsup (DA 6314/ZE), then the CBF is
blocked and the fault is annunciated (CBF/BI-RELĆ
sup>T). As long as this signal is active, the CBF
function is blocked for all feeders.
D If the CBF signal from a specific bay is active and
no CBF release signal is given after a set time FLT
TBF(DA 6315/ZE), then the CBF function is blokĆ
ked selectively and annunciated. (CBF/
BIFlt:Lx:Ayy).
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