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Threshold value
Dropout
Time multiplier
Minimum time of the curve
Additional time 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
Normal inverse: type A
Very inverse: type B
Extremely inverse: type C
Long-time inverse: type B
Operate Curves and Dropout-Time Characteristic Curves according to ANSI/IEEE
Inverse: type C
Short inverse
Long inverse
Moderately inverse
Very inverse
Extremely inverse
Definite inverse
Direction Determination
Type
Forward range
53
If you have selected the method of measurement = RMS value, do not set the threshold value under 0.1 l
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
1 A @ 50 and 100 Irated
53
5 A @ 50 and 100 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
12.8 Directional Overcurrent Protection, Phases
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 1.00 s
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
See chapter
12.6.2 Stage with Inverse-Time Charac-
teristic
Curve,
Figure 12-1
See chapter
12.6.2 Stage with Inverse-Time Charac-
teristic
Curve,
Figure 12-2
See chapter
12.6.2 Stage with Inverse-Time Charac-
teristic
Curve,
Figure 12-3
See chapter
12.6.2 Stage with Inverse-Time Charac-
teristic
Curve,
Figure 12-4
See chapter
12.6.2 Stage with Inverse-Time Charac-
teristic
Curve,
Figure 12-5
See chapter
12.6.2 Stage with Inverse-Time Charac-
teristic
Curve,
Figure 12-6
With healthy voltages
With voltage memory 2 s
V
±88°
ref,rot
Technical Data
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
.
rated,sec
827
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