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Technical Data
12.6 Overcurrent Protection, Phases
Influencing Variables for Thresholds
Transient excess pickup in method of measurement =
fundamental component, for τ > 100 ms (with
complete unbalance)
12.6.2
Stage with Inverse-Time Characteristic Curve
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
Time multiplier
Pickup delay
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout
Minimum absolute dropout differential
Protection-class current transformer
Instrument current transformer
Reset of the Integration Timer
Instantaneous
Disk emulation
Operate Curves and Dropout-Time Characteristic Curves according to IEC
Extension of the operate time during operation with
transformer inrush-current detection
808
1 A @ 50 and 100 Irated
5 A @ 50 and 100 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
< 5 %
-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
Disk emulation
Instantaneous
0.00 to 15.00
0.00 s to 60.00 s
95 % of 1.1 ⋅ threshold value
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
With dropout
Approx. < 0.90 ⋅ threshold value
Approx. 10 ms
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
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