Siemens siprotec 7SA522, Руководство пользователя

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Functions
6-226
7SA522 Manual
C53000-G1176-C119-2
6.16.2 Applying the Function Parameter Settings
The sensitivity of the measured value monitoring can be changed. In the factory, pre-
settings 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($685(683(59
the measured value monitoring can be switched
21
or
2))
.
Symmetry
Monitoring Address
%$/$1&(8/,0,7
determines the voltage threshold (phase–phase),
above which the voltage symmetry monitoring is in service (refer to Figure 6-116). Ad-
dress
%$/)$&7258
is the corresponding symmetry factor, i.e. the slope of
the symmetry characteristic (Figure 6-116).
Address
%$/$1&(,/,0,7
determines the current threshold above which the
current symmetry monitoring is in service (refer also to Figure 6-115). Address
%$/)$&725,
is the corresponding symmetry factor, i.e. the slope of the symmetry
characteristic (Figure 6-115).
Summation
Monitoring Address SI THRESHOLD determines the current threshold above which the cur-
rent summation monitoring (refer to Figure 6-114) picks up (absolute value, only re-
ferred to I
N
). The relative component (referred to the maximum conductor current) for
the pick-up of the current summation monitoring (Figure 6-114) is set in address
SI FACTOR.
Voltage sum internal (measured value
acquisition) “
)DLO
Σ
83K(
” (165) general alarms: 164, 160 as allocated
Voltage symmetry external (primary plant or
voltage transformers) “
)DLO8EDODQFH
”
(167)
general alarms: 164, 160 as allocated
Voltage phase rotation Extrem (primary plant or
connection) “
)DLO3K6HT
”
(171)
general alarm: 160 as allocated
Voltage failure,
three-phase,
Fuse failure monitor external (primary plant or
connection) “
)XVH²)DLOXUH
” (169,
170)
general alarm: 160
distance protection
blocked as allocated
Voltage failure,
single-/two-phase,
Fuse failure monitor external (voltage transform-
ers) “
)XVH²)DLOXUH
” (169,
170)
general alarm: 160
distance protection
blocked as allocated
Trip circuit supervision external (trip circuit or
control voltage failure) “
)$,/7ULSFLU
”
(6865)
general alarm: – as allocated
Table 6-6 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