Logic
[logfpsy0-240614-01.vsd, 2, en_US]
Figure 6-145
Logic Diagram of the Non-Directional Y0 Stage
Measured Value V0, Method of Measurement
The device can measure the residual voltage at the broken-delta winding. The measured voltage VN is
converted to a value with reference to the zero-sequence voltage V0. If the residual voltage is not available,
the device calculates the zero-sequence voltage V0 from the measured phase-to-ground voltages V
A
, V
B
, and
V
C
using the defining equation.
The method of measurement processes the sampled voltage values and filters out the fundamental compo-
nent numerically.
Protection and Automation Functions
6.15 Sensitive Ground-Fault Detection
616 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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