Siemens siprotec 7SA6 User Manual

Functions
6-2637SA6 Manual
C53000-G1176-C133-1
6.19.2 Applying the Function Parameter Settings
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($685(683(59 the measured value monitoring can be switched
21 or 2)).
Symmetry
Monitoring
Address  %$/$1&(8/,0,7 determines the voltage threshold (phase–phase),
above which the voltage symmetry monitoring is in service (refer to Figure 6-132).
Address  %$/)$&7258 is the corresponding symmetry factor, i.e. the slope
of the symmetry characteristic (Figure 6-132).
Address  %$/$1&(,/,0,7 determines the current threshold above which the
current symmetry monitoring is in service (refer also to Figure 6-131). Address 
%$/)$&725, is the corresponding symmetry factor, i.e. the slope of the symmetry
characteristic (Figure 6-131).
Summation
Monitoring
Address  Σ,7+5(6+2/' determines the current threshold above which the
current summation monitoring (refer to Figure 6-130) picks up (absolute value, only
referred to I
N
). The relative component (referred to the maximum conductor current)
for the pick-up of the current summation monitoring (Figure 6-130) is set in address
 Σ,)$&725.
Voltage sum internal (measured value
acquisition)
“)DLOΣ83K(” (165) general alarms: 164, 160 as allocated
Voltage symmetry external (primary plant or
voltage transformers)
“)DLO8EDODQFH”
(167)
general alarms: 164, 160 as allocated
Voltage phase rotation Extrem (primary plant or
connection)
“)DLO3K6HT”
(171)
general alarm: 160 as allocated
Voltage failure,
three-phase,
Fuse failure monitor
external (primary plant or
connection)
“)XVH²)DLOXUH” (169,
170)
general alarm: 160
distance protection
blocked
as allocated
Voltage failure,
single-/two-phase,
Fuse failure monitor
external (voltage transform-
ers)
“)XVH²)DLOXUH” (169,
170)
general alarm: 160
distance protection
blocked
as allocated
Trip circuit supervision external (trip circuit or
control voltage failure)
“)$,/7ULSFLU”
(6865)
general alarm: – as allocated
Table 6-12 Summary of the device response to detected failures
Monitoring Possible causes Alarm (function no.) Failure response
General alarms
Output
1
) Following three unsuccessful reboot attempts, the device is taken out of service
2
) D.OK = “Device Okay” = Live contact relay

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English