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Technical Data
12.4 Circuit-Breaker Restrike Protection
12.4
Circuit-Breaker Restrike Protection
Setting Values
Threshold value
Monitoring duration
Position recognition delay
Dropout delay
Trip delay time
Retrip delay time
Minimum operate (trip) time
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout differential derived from the parameter Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for overcurrent and of 105 % for undercur-
rent functionality.
Minimum absolute dropout differential
Protection-class current transformer
Instrument current transformer
Times
Operate time with time delay = 0 ms
Dropout time
Frequency Operating Range
0.9 ≤ f/f
≤ 1.1
rated
10 Hz ≤ f < 0.9 f
1.1 f
< f ≤ 90 Hz
rated
f < 10 Hz
f > 90 Hz
Tolerances
Threshold
Time delays
804
1 A @ 50 and 100 Irated
5 A @ 50 and 100 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
rated
0.030 A to 35.000 A
0.15 A to 175.00 A
0.001 A to 1.600 A
0.005 A to 8.000 A
1.00 s to 600.00 s
0.00 s to 60.00 s
0.00 s to 60.00 s
0.05 s to 60.00 s
0.00 s to 60.00 s
0.00 s to 60.00 s
15 mA sec. (I
= 1 A) or
rated
75 mA sec. (I
= 5 A)
rated
0.5 mA sec. (I
= 1 A) or
rated
2.5 mA sec. (I
= 5 A)
rated
Approx. 25 ms + OOT at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Approx. 20 ms + OOT
According to specified tolerances
Slightly expanded tolerances
Active
1 % of the setting value or 5 mA (I
(I
= 5 A)
rated
1 % of the setting value or 10 ms
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
Increments of 0.001 A
Increments of 0.01 A
Increments of 0.001 A
Increments of 0.001 A
Increments of 0.01 s
Increments of 0.01 s
Increments of 0.01 s
Increments of 0.01 s
Increments of 0.01 s
Increments of 0.01 s
= 1 A) or 25 mA
rated
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