Inverse-time dropout time to IEC, ANSI, logarithmic
inverse-time characteristic, logarithmic inverse time
with knee-point characteristic, and user-defined charac-
teristic curve
5 % of setting value or +2 % current tolerance or 30
ms
Direction-determination angle error 1º
Influencing Variables for Thresholds
Transient excess pickup in method of measurement =
fundamental component, for τ > 100 ms (with complete
unbalance)
< 5 %
Technical Data
11.11 Directional Time-Overcurrent Protection, Ground
1140 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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