Applying The Function Parameter Settings - Siemens siprotec 7SA6 User Manual

Table 6-12 Summary of the device response to detected failures
Monitoring
Voltage sum
Voltage symmetry
Voltage phase rotation
Voltage failure,
three-phase,
Fuse failure monitor
Voltage failure,
single-/two-phase,
Fuse failure monitor
Trip circuit supervision
1
) Following three unsuccessful reboot attempts, the device is taken out of service
2
) D.OK = "Device Okay" = Live contact relay

6.19.2 Applying the Function Parameter Settings

Symmetry
Monitoring
Summation
Monitoring
7SA6 Manual
C53000-G1176-C133-1
Possible causes
internal (measured value
acquisition)
external (primary plant or
voltage transformers)
Extrem (primary plant or
connection)
external (primary plant or
connection)
external (voltage transform-
ers)
external (trip circuit or
control voltage failure)
The sensitivity of the measured value monitoring can be changed. In the factory,
presettings based on experience have already been applied, which should be
sufficient for most applications. If particularly high operational asymmetries of the
currents and/or voltages are expected, or if one or more monitoring functions pick up
sporadically during normal operation, the sensitivity setting(s) should be reduced.
In address   0($685( 683(59 the measured value monitoring can be switched
21 or 2)).
Address   %$/$1&( 8/,0,7 determines the voltage threshold (phase–phase),
above which the voltage symmetry monitoring is in service (refer to Figure 6-132).
Address   %$/ )$&725 8 is the corresponding symmetry factor, i.e. the slope
of the symmetry characteristic (Figure 6-132).
Address   %$/$1&( , /,0,7 determines the current threshold above which the
current symmetry monitoring is in service (refer also to Figure 6-131). Address  
%$/ )$&725 , is the corresponding symmetry factor, i.e. the slope of the symmetry
characteristic (Figure 6-131).
Address   Σ, 7+5(6+2/' determines the current threshold above which the
current summation monitoring (refer to Figure 6-130) picks up (absolute value, only
referred to I ). The relative component (referred to the maximum conductor current)
N
for the pick-up of the current summation monitoring (Figure 6-130) is set in address
  Σ, )$&725.
Alarm (function no.)
")DLO Σ8 3K(" (165) general alarms: 164, 160 as allocated
")DLO 8 EDODQFH"
general alarms: 164, 160 as allocated
(167)
")DLO 3K 6HT"
general alarm: 160
(171)
")XVH²)DLOXUH" (169, general alarm: 160
170) distance protection
blocked
")XVH²)DLOXUH" (169, general alarm: 160
170) distance protection
blocked
")$,/ 7ULS FLU"
general alarm: –
(6865)
Failure response
General alarms
as allocated
as allocated
as allocated
as allocated
Functions
Output
6-263