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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
Times
The maximum pickup time with operate delay = 0 ms Approx. 30 ms + OOT at 50 Hz
Extension of the operate time during operation with
inrush-current detection
Dropout time
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
12.9 Directional Overcurrent Protection, Ground
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
Refer to the respective figure of the technical data for
the non-dir-OC-ground function
Inverse-Time Characteristic Curve
Refer to the respective figure of the technical data for
the non-dir-OC-ground function
Inverse-Time Characteristic Curve
Approx. 25 ms + OOT at 60 Hz
Approx. 10 ms
Approx. 20 ms + OOT
Technical Data
–
Increments of 0.01
Increments of 0.01 s
Increments of 0.01 s
12.7.2 Stage with
12.7.2 Stage with
831
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