Siemens Siprotec 7UM611 User Manual

2.19 Rate-of-Frequency-Change Protection df/dt (ANSI 81R)
121
7UM61 Manual
C53000-G1176-C127-3
Setting changes are necessary e.g. to obtain a great dropout difference. For the de-
tection of very small frequency changes (< 0.5 Hz/s), the default setting of the mea-
suring window should be extended. This is to improve the measuring accuracy.
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”.
2.19.3 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Ad-
ditional Settings.
Setting value
Stage df
n
/dt
df/dt HYSTERES.
(Addr. 4519, 4521)
dfx/dt M-WINDOW
(Addr. 4520, 4522)
0.1...0.5 Hz/s ≈ 0.05 25...10
0.5...1 Hz/s ≈ 0.1 10...5
1...0.5 Hz/s ≈ 0.2 10...5
5...00.10 Hz/s ≈ 0.5 5...1
Addr. Parameter Setting Options Default Setting Comments
4501 df/dt Protect. OFF
ON
Block relay
OFF Rate-of-frequency-change pro-
tection
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 T df1/dt 0.00 .. 60.00 sec; ∞ 0.50 sec Time Delay of df1/dt Stage
4505 df1/dt & f1 OFF
ON
OFF AND logic with pickup of stage f1
4506 df2/dt >/< -df/dt<
+df/dt>
-df/dt< Mode of Threshold (df2/dt >/<)
4507 STAGE df2/dt 0.1 .. 10.0 Hz/s; ∞ 1.0 Hz/s Pickup Value of df2/dt Stage
4508 T df2/dt 0.00 .. 60.00 sec; ∞ 0.50 sec Time Delay of df2/dt Stage
4509 df2/dt & f2 OFF
ON
OFF AND logic with pickup of stage f2
4510 df3/dt >/< -df/dt<
+df/dt>
-df/dt< Mode of Threshold (df3/dt >/<)
4511 STAGE df3/dt 0.1 .. 10.0 Hz/s; ∞ 4.0 Hz/s Pickup Value of df3/dt Stage
4512 T df3/dt 0.00 .. 60.00 sec; ∞ 0.00 sec Time Delay of df3/dt Stage
4513 df3/dt & f3 OFF
ON
OFF AND logic with pickup of stage f3
4514 df4/dt >/< -df/dt<
+df/dt>
-df/dt< Mode of Threshold (df4/dt >/<)
4515 STAGE df4/dt 0.1 .. 10.0 Hz/s; ∞ 4.0 Hz/s Pickup Value of df4/dt Stage
4516 T df4/dt 0.00 .. 60.00 sec; ∞ 0.00 sec Time Delay of df4/dt Stage
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Siemens Siprotec 7UM611 Specifications

General

Brand	Siemens
Model	Siprotec 7UM611
Category	Relays
Language	English