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
Inverse-Time Characteristic Curve
Very inverse: type B
Extremely inverse: type C
Inverse-Time Characteristic Curve
Long-time inverse: type B
Short-time inverse
(Only in the advanced stage)
Inverse-Time Characteristic Curve
Operate Curves and Dropout-Time Characteristic Curves according to ANSI/IEEE
Inverse: type C
Inverse-Time Characteristic Curve
Short inverse
Long inverse
Inverse-Time Characteristic Curve
Moderately inverse
Very inverse
Inverse-Time Characteristic Curve
Extremely inverse
Definite inverse
Inverse-Time Characteristic Curve
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
11.18 Directional Overcurrent Protection, Ground
954
SIPROTEC 5, Low-Impedance Busbar Protection, Manual
C53000-G5040-C019-C, Edition 04.2021