Settings - Siemens Siprotec 7UM611 Manual

Delay Times If the static limit curve consisting of the characteristics 1 and 2 is exceeded, the voltage
regulator must first have the opportunity of increasing the excitation. For this reason,
a warning message due to this criterion is "long-time" delayed (at least 10 s for 3004
T CHAR. 1 and 3007 T CHAR. 2).
However if an external excitation monitoring signals the failure of an excitation voltage
to the device via a binary input, a switch-off can be performed with a short time delay.
Table 2-4
Note: If very short time delays are selected, dynamic balancing procedures may
cause unwanted operations. For this reason, it is recommended to set time values of
0.05 s or higher.

2.11.3 Settings

Addresses which have an appended "A" can only be changed with DIGSI, under Ad-
ditional Settings.
Addr. Parameter
3001 UNDEREXCIT.
3002 1/xd CHAR. 1
3003 ANGLE 1
3004 T CHAR. 1
3005 1/xd CHAR. 2
3006 ANGLE 2
3007 T CHAR. 2
3008 1/xd CHAR. 3
3009 ANGLE 3
3010 T CHAR 3
7UM61 Manual
C53000-G1176-C127-3
Setting the Underexcitation Protection
Characteristic 1 and 2 static stability undelayed
Characteristic 1 and 2 static stability long-time delayed
Characteristic 1 and 2 Excitation
Voltage Failure
Characteristic 3 dynamic stability
Setting Options
OFF
ON
Block relay
0.25 .. 3.00
50 .. 120 °
0.00 .. 60.00 sec; ∞
0.25 .. 3.00
50 .. 120 °
0.00 .. 60.00 sec; ∞
0.25 .. 3.00
50 .. 120 °
0.00 .. 60.00 sec; ∞
2.11 Underexcitation (Loss-of-Field) Protection (ANSI 40)
T CHAR. 1 = T CHAR. 2 ≈
10 s
short–time delayed
T SHRT Uex< ≈ 1.5 s
short–time delayed
T CHAR 3 ≈ 0.5 s
Default Setting
OFF
0.41
80 °
10.00 sec
0.36
90 °
10.00 sec
1.10
90 °
0.30 sec
Annunciation:
Exc < Anr
Trippings
Err<1 TRIP / Err<2 TRIP
Tripping
Err< UPU < TRIP
Tripping
Exc<3 TRIP
Comments
Underexcitation Protection
Conductance Intersect Character-
istic 1
Inclination Angle of Characteristic
1
Characteristic 1 Time Delay
Conductance Intersect Character-
istic 2
Inclination Angle of Characteristic
2
Characteristic 2 Time Delay
Conductance Intersect Character-
istic 3
Inclination Angle of Characteristic
3
Characteristic 3 Time Delay
83