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Technical Data
12.6 Overcurrent Protection, Phases
12.6
Overcurrent Protection, Phases
Stage with Definite-Time Characteristic Curve
12.6.1
Setting Value for the Function Block Filter
h(0)
h(1)
h(2)
h(3)
h(4)
Setting Values for Protection Stage
Method of measurement
Threshold value
Dropout ratio
Operate delay
Dropout delay
Pickup delay
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
Extension of the operate time during operation with
transformer inrush-current detection
Dropout time
If you have selected the method of measurement = RMS value, do not set the threshold value under 0.1 l
34
35
OOT (Output Operating Time): additional delay of the output medium used, for example 5 ms with fast relays
806
34
1 A @ 50 and 100 Irated
5 A @ 50 and 100 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
-100.000 to 100.000
-100.000 to 100.000
-100.000 to 100.000
-100.000 to 100.000
-100.000 to 100.000
Fundamental component
RMS value
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
0.90 to 0.99
0.00 s to 100.00 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
35
Approx. 25 ms + OOT
at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Approx. 10 ms
Approx. 20 ms + OOT
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
Increments of 0.001
Increments of 0.001
Increments of 0.001
Increments of 0.001
Increments of 0.001
–
Increments of 0.001 A
Increments of 0.01 A
Increments of 0.001 A
Increments of 0.001 A
Increments of 0.01
Increments of 0.01 s
Increments of 0.01 s
Increments of 0.01 s
.
rated,sec
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