Threshold value
53
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 Disk emulation
Instantaneous
–
Time multiplier 0.00 to 15.00 Increments of 0.01
Minimum time of the curve 0.00 s to 1.00 s Increments of 0.01 s
Additional time 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 95 % of 1.1 ⋅ threshold value
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)
Reset of the Integration Timer
Instantaneous
With dropout
Disk emulation Approx. < 0.90 ⋅ threshold value
Operate Curves and Dropout-Time Characteristic Curves according to IEC
Normal inverse: type A
See chapter 12.6.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-1
Very inverse: type B
Extremely inverse: type C See chapter 12.6.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-2
Long-time inverse: type B
Operate Curves and Dropout-Time Characteristic Curves according to ANSI/IEEE
Inverse: type C
See chapter 12.6.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-3
Short inverse
Long inverse See chapter 12.6.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-4
Moderately inverse
Very inverse See chapter 12.6.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-5
Extremely inverse
Definite inverse See chapter 12.6.2 Stage with Inverse-Time Charac-
teristic Curve, Figure 12-6
Direction Determination
Type
With healthy voltages
With voltage memory 2 s
Forward range V
ref,rot
±88°
53
If you have selected the method of measurement = RMS value, do not set the threshold value under 0.1 l
rated,sec
.
Technical Data
12.8 Directional Overcurrent Protection, Phases
SIPROTEC 5, Merging Unit 6MU85, Manual 827
C53000-G5040-C074-1, Edition 01.2020
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