Siemens SIPROTEC 5 6MU85 - 12.6 Overcurrent Protection, Phases

Overcurrent Protection, Phases
Stage with Definite-Time Characteristic Curve
Setting Value for the Function Block Filter
h(0) -100.000 to 100.000 Increments of 0.001
h(1) -100.000 to 100.000 Increments of 0.001
h(2) -100.000 to 100.000 Increments of 0.001
h(3) -100.000 to 100.000 Increments of 0.001
h(4) -100.000 to 100.000 Increments of 0.001
Setting Values for Protection Stage
Method of measurement Fundamental component
RMS value
–
Threshold value
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1 A @ 50 and 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.001 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.005 A to 8.000 A Increments of 0.001 A
Dropout ratio 0.90 to 0.99 Increments of 0.01
Operate delay 0.00 s to 100.00 s Increments of 0.01 s
Dropout delay 0.00 s to 60.00 s Increments of 0.01 s
Pickup delay 0.00 s to 60.00 s Increments of 0.01 s
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 15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument current transformer 0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Times
Operate time with time delay = 0 ms
Approx. 25 ms + OOT
35
at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Extension of the operate time during operation with
transformer inrush-current detection
Approx. 10 ms
Dropout time Approx. 20 ms + OOT
12.6
12.6.1
34
If you have selected the method of measurement = RMS value, do not set the threshold value under 0.1 l
rated,sec
.
35
OOT (Output Operating Time): additional delay of the output medium used, for example 5 ms with fast relays
Technical Data
12.6 Overcurrent Protection, Phases
806 SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020