Minimum Voltage
Address 4518
U MIN
is used to set the minimum voltage below which the frequency change protection will
be blocked. A value of approx. 65 % U
N
is recommended. The minimum voltage threshold can be deactivated
by setting this address to 0.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
Addr.
Parameter
Setting Options
Default Setting
Comments
4501
df/dt Protect.
OFF
ON
Block relay
OFF
Rate-of-frequency-change protec-
tion
4502
df1/dt >/<
-df/dt<
+df/dt>
-df/dt<
Mode of Threshold (df1/dt >/<)
4503
STAGE df1/dt
0.1 .. 10.0 Hz/s
1.0 Hz/s
Pickup Value of df1/dt Stage
4504
STAGE df1/dt
0.1 .. 3.0 Hz/s
0.3 Hz/s
Pickup Value of df1/dt Stage
4505
T df1/dt
0.00 .. 60.00 sec
0.50 sec
Time Delay of df1/dt Stage
4506
df1/dt & f1
OFF
ON
OFF
AND logic with pickup of stage f1
4507
df2/dt >/<
-df/dt<
+df/dt>
-df/dt<
Mode of Threshold (df2/dt >/<)
4508
STAGE df2/dt
0.1 .. 10.0 Hz/s
1.0 Hz/s
Pickup Value of df2/dt Stage
4509
STAGE df2/dt
0.1 .. 3.0 Hz/s
0.3 Hz/s
Pickup Value of df2/dt Stage
4510
T df2/dt
0.00 .. 60.00 sec
0.50 sec
Time Delay of df2/dt Stage
4511
df2/dt & f2
OFF
ON
OFF
AND logic with pickup of stage f2
4512
df3/dt >/<
-df/dt<
+df/dt>
-df/dt<
Mode of Threshold (df3/dt >/<)
4513
STAGE df3/dt
0.1 .. 10.0 Hz/s
4.0 Hz/s
Pickup Value of df3/dt Stage
4514
STAGE df3/dt
0.1 .. 3.0 Hz/s
1.3 Hz/s
Pickup Value of df3/dt Stage
4515
T df3/dt
0.00 .. 60.00 sec
0.00 sec
Time Delay of df3/dt Stage
4516
df3/dt & f3
OFF
ON
OFF
AND logic with pickup of stage f3
4517
df4/dt >/<
-df/dt<
+df/dt>
-df/dt<
Mode of Threshold (df4/dt >/<)
4518
STAGE df4/dt
0.1 .. 10.0 Hz/s
4.0 Hz/s
Pickup Value of df4/dt Stage
4519
STAGE df4/dt
0.1 .. 3.0 Hz/s
1.3 Hz/s
Pickup Value of df4/dt Stage
4520
T df4/dt
0.00 .. 60.00 sec
0.00 sec
Time Delay of df4/dt Stage
4521
df4/dt & f4
OFF
ON
OFF
AND logic with pickup of stage f4
4522
U MIN
10.0 .. 125.0 V
65.0 V
Minimum Operating Voltage Umin
4523A
df1/2 HYSTERES.
0.02 .. 0.99 Hz/s
0.10 Hz/s
Reset Hysteresis for df1/dt & df2/dt
4524A
df1/2 M-WINDOW
1 .. 25 Cycle
5 Cycle
Measuring Window for df1/dt &
df2/dt
4525A
df3/4 HYSTERES.
0.02 .. 0.99 Hz/s
0.40 Hz/s
Reset Hysteresis for df3/dt & df4/dt
4526A
df3/4 M-WINDOW
1 .. 25 Cycle
5 Cycle
Measuring Window for df3/dt &
df4/dt
2.7.3
Functions
2.7 Rate-of-frequency-change protection
SIPROTEC 4, 7VE61 and 7VE63, Manual
95
C53000-G1176-C163-3, Edition 10.2017
Summary of Contents for SIPROTEC 4 7VE61
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