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
Refer to the respective figure of the technical data for
the non-dir-OC-ground function 12.7.2 Stage with
Inverse-Time Characteristic Curve
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
Refer to the respective figure of the technical data for
the non-dir-OC-ground function 12.7.2 Stage with
Inverse-Time Characteristic Curve
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
Approx. 25 ms + OOT at 60 Hz
Extension of the operate time during operation with
inrush-current detection
Approx. 10 ms
Dropout time Approx. 20 ms + OOT
Technical Data
12.9 Directional Overcurrent Protection, Ground
SIPROTEC 5, Merging Unit 6MU85, Manual 831
C53000-G5040-C074-1, Edition 01.2020
To Next Page
Loading...
