Siemens SIPROTEC 7SD80 Manual page 175

Table 2-4 Summary of the Device's Fault Responses
Monitoring Possible causes
Auxiliary voltage External (aux. voltage) Inter-
failure nal (converter)
Measured-value ac- Internal (converter or refer-
quisition ence voltage)
Buffer battery Internal (Buffer battery)
Hardware watchdog Internal (processor failure)
Software watchdog Internal (program sequence) Restart attempt
Working memory Internal (RAM)
ROM
Program memory Internal (EPROM)
RAM
Settings memory Internal (Flash-EPROM or
RAM)
Sampling frequency Internal (clock generator)
Adjustment values Internal (EEPROM or RAM) Indication:
Modules Module does not comply
with order number (MLFB)
Current sum Internal (measured value
acquisition)
Current symmetry External (power system or
current transformer)
Broken wire External (power system or
current transformer)
Voltage symmetry External (power system or
voltage transformer)
Voltage phase se- External (power system or
quence connection)
Voltage failure, External (power system or
3-phase „Fuse connection)
Failure Monitor"
Voltage loss, External (voltage transform-
„Fuse failure moni- ers)
tor"
Voltage failure, External (power system or
3-phase connection)
Trip circuit External (trip circuit or
supervision control voltage)
1)
Following three unsuccessful restarting attempts, the device is put out of operation
2)
DOK = „Device OK" = NC contact of the readiness relay = life contact
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
Fault response
Device out of operation All LEDs dark
Protection out of opera- ERROR „LED"
tion, alarm „Error A/D-conv." (181)
Indication „Fail Battery" (177)
Device out of operation ERROR „LED"
1)
ERROR „LED"
1)
Restart attempt , Restart LED flashes
abort
Device out of operation
1)
Restart attempt ERROR „LED"
1)
Restart attempt ERROR „LED"
1)
Restart attempt ERROR „LED"
„Alarm adjustm." (193)
Using default values
Indications: „Error Board 1...5" (183
Protection out of operation ... 187)
and if applicable
„Error A/D-conv.". (181)
„Failure Σi" (289)
Indication
Total blocking of the differ-
ential protection
Indication „Fail I balance" (163)
Indication „Broken Iwire L1" (290),
Phase-selective blocking „Broken Iwire L2" (291),
of the differential protec- „Broken Iwire L3" (292)
tion
Indication „Fail V balance" (167)
Indication „Fail Ph. Seq." (171)
Indication „VT FuseFail>10s"
Undervoltage protection (169),
blocked, „VT FuseFail" (170)
Frequency protection
blocked
Indication „VT FuseFail>10s"
Undervoltage protection (169),
blocked, „VT FuseFail" (170)
Indication „Fail V absent" (168)
Undervoltage protection
blocked,
Indication „74TC Trip cir." (6865)
2.14 Monitoring Functions
Indication (no.) Output
2)
DOK
2)
DOK
As routed
2)
DOK
2)
DOK
2)
DOK
2)
DOK
2)
DOK
2)
DOK
As routed
2)
DOK
As routed
As routed
As routed
As routed
As routed
As routed
As routed
As routed
As routed
Functions
drops out
drops out
drops out
drops out
drops out
drops out
drops out
drops out
drops out
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