Table of Contents
Advertisement
Functions
2.8 Earth Fault Protection in Earthed Systems (optional)
Figure 2-106
Logic diagram of the 3I
Zero-sequence voltage time protection (U
The zero-sequence voltage time protection operates according to a voltage-dependent trip time characteristic.
It can be used instead of the time overcurrent stage with inverse time delay.
The voltage/time characteristic can be displaced in voltage direction by a constant voltage (U0inv. minimum,
valid for t → ∞) and in time direction by a constant time (T forw. (U0inv)). The characteristics are shown
in the Technical Data.
222
stage for the inverse logarithmic characteristic
0P
inverse)
0
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Advertisement
Table of Contents
