Settings Of The Rate-Of-Frequency-Change Protection - Siemens Siprotec 7UM62 Manual

Functions
Minimum Voltage

2.24.2.1 Settings of the Rate-of-Frequency-Change Protection

Addr. Setting Title
4501 df/dt Protect.
4518 U MIN
4519A df1/2 HYSTERES.
4520A df1/2 M-WINDOW
4521A df3/4 HYSTERES.
4522A df3/4 M-WINDOW
4502 df1/dt >/<
4503 STAGE df1/dt
4504 T df1/dt
4505 df1/dt & f1
4506 df2/dt >/<
4507 STAGE df2/dt
4508 T df2/dt
170
Table 2-12
Setting Value
stage dfn/dt
0.1...0.5 Hz/s
0.5...1 Hz/s
1...5 Hz/s
5...20 Hz/s
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
minimum voltage threshold can be deactivated by setting this address to „0".
Setting Options
OFF
ON
Block relay for trip com-
mands
10.0..125.0 V; 0
0.02..0.99 Hz/s
1..25 Cycle
0.02..0.99 Hz/s
1..25 Cycle
-df/dt< negative rate of freq.
change
+df/dt> positive rate of freq.
change
0.1..10.0 Hz/s; ∞
0.00..60.00 sec; ∞
OFF
ON
-df/dt< negative rate of freq.
change
+df/dt> positive rate of freq.
change
0.1..10.0 Hz/s; ∞
0.00..60.00 sec; ∞
df/dt HYSTERESIS
(Addr. 4519A, 4521A)
≈ 0,05
≈ 0,1
≈ 0,2
≈ 0,5
Default Setting
OFF Rate-of-frequency-change pro-
tection
65.0 V Minimum Operating Voltage
Umin
0.10 Hz/s Reset Hysteresis for df1/dt &
df2/dt
5 Cycle Measuring Window for df1/dt &
df2/dt
0.40 Hz/s Reset Hysteresis for df3/dt &
df4/dt
5 Cycle Measuring Window for df3/dt &
df4/dt
-df/dt< negative Mode of Threshold (df1/dt >/<)
rate of freq.
change
1.0 Hz/s Pickup Value of df1/dt Stage
0.50 sec Time Delay of df1/dt Stage
OFF AND logic with pickup of stage f1
-df/dt< negative Mode of Threshold (df2/dt >/<)
rate of freq.
change
1.0 Hz/s Pickup Value of df2/dt Stage
0.50 sec Time Delay of df2/dt Stage
dfx/dt M WINDOW
(Addr. 4520A, 4522A)
25...10
10...5
10...5
5...1
is recommended. The
N
Comments
7UM62 Manual
C53000-G1176-C149-3