Supervisory Functions
153
7SS52 V4 Manual
C53000-G1176-C182-3
Permanent monitoring of the program flow
by means of watchdog (BU, CU)
After three unsuccessful restart attempts the
protection is blocked.
Differential current supervision
• Bus zone-selective protection
| Σ I | >Id> SUPERV BZ (6308/CU)
for T >T-Idiff SUPERV (6307/CU)
• Check zone, all except bus coupler
| Σ I | >Id> SUPERV CZ (6309/CU)
for T >T-Idiff SUPERV (6307/CU)
Current transformer circuit faulty
Bus zone-selective blocking
if the parameter DIF SUP mode BZ (6310/
CU) is set to blocking, otherwise only alarm
"IdSup Lz-y $03" (FNo. 177.1321,
177.1322, 177.1323, 177.1326,
177.1327, 177.1328/CU)
Blocking if the parameter
DIF SUP mode CZ (6311/CU) is set to
blocking, otherwise only alarm
"Id-Sup CZ Lz" (FNo. 10411, 10412,
10413/CU)
Monitoring of isolator status
• Running position
Isolator OPEN/CLOSED = 0/0
for T >ISOL TIME (6301/CU)
• Auxiliary voltage supply failure
All isolator positions
of one bay = 0/0
• Implausible isolator status
Isolator OPEN/CLOSED = 1/1
Wire break or intermediate status
Alarm "FltR $01 $02"
(FNo. 176.1112, 176.1117, 176.1122,
176.1127, 176.1132/CU)
Feeder aux. voltage MCB tripped
Alarm "BayDC fail $00"
(FNo. 176.1134/CU)
Alarm "FltP $01 $02" (FNo. 176.1113,
176.1118, 176.1123, 176.1128,
176.1133/CU)
Cyclic check of
the
data transmission links (FO) between
central unit and bay unit
Blocking of the protection system and alarm
after two recognitions of a transmission error
"Fail Com.CU" (FNo. 7650/BU)
Monitoring of
">CBF Lx", ">CBF 3-pole"
for T > 15 s
">CBF Lx", ">CBF 3-pole" and
">CBF release", ">release 3-pole"
for T > T-BF 2chan (XX28/CU)
">CBF release", ">release 3-pole"
for T >T-BF rel sup (XX27/CU)
">B.U.CBF Lx"
, ">B.U.CBF 3-pole"
for T = B.U.CBF-T (3912/BU) + 5 s
(but min. 15 s)
Alarm and blocking of the binary
input of the affected feeder
"BF-BIErr $00 Lz" (FNo. 176.1091,
176.1092, 176.1093/CU) or
"BF-BIErr $00 3P" (FNo. 176.1094/CU);
Supervision picks up if a signal is present at
the BI BF-phase for the time T > 15s;
Supervision picks up if both BI BF-phase and
BI BF release do not arrive within the time win-
dow T = limit;
Alarm and blocking of CBF
"BFRlErr $01 1P" (FNo. 176.1101/CU)
or
"BFRlErr $00 3P" (FNo. 176.1102/CU)
Cyclic test with simulation of a fault current
and monitoring of the entire signal process-
ing from the digitized measured values to
the control currents of the trip relay coils
After three recognitions of an error blocking of
the protection and alarm.
"Flt aut $00" (FNr. 176.1190/CU) and
"Flt autotest M" (FNr. 10429/CU)
Zero current monitoring Monitoring is done phase-selectively and the
alarm "Block ZeroCross" (FNo. 10444/
CU) is generated.
Monitoring Possible cause and response
www . ElectricalPartManuals . com
To Next Page
Loading...
Need help?
General
