Siemens 6MD85 Manual page 863

•
With the binary signal
uring points.
•
With the binary signal
The Inverted phases parameter available for each measuring point is used to set which phases at the
measuring point must be swapped. The parameter can be found at each 3-phase measuring point.
The 2 binary-signal mechanisms are explained separately below.
Switchover of the Phase Sequence of All Measuring Points
The direction of rotation of the currents and voltages depends on the phase sequence. The following drawing
shows the vector definitions for the 2 phase sequences.
[dwphrdrf-240211-01.tif, 1, en_US]
Figure 7-177
The phase sequence of a system or a system section is defined when parameterizing via the Phase
sequence parameter. The setting parameter acts on all measuring points.
The operationally induced switchover between the phase sequence ABC and the phase sequence ACB is initi-
ated via the binary input
ously at all 3-phase measuring points.
The following image shows a logic diagram for determining the current phase assignment and switchover.
The indications shown on the right show the present phase sequence. If the phase sequence is set via the
Phase sequence parameter to ABC, activation of the binary input will result in a switchover to the phase
sequence ACB.
NOTE
i
i
The switchover of the phase sequence is only authorized for a time at which no measured values are
pending. The switchover command must be present for at least 200 ms. The change of phase sequence is
only permissible when the machine is at standstill. If the current and voltage values of all 3-phase meas-
uring points are below 5 % of the rated variables, this is recognized as machine standstill.
A renewed machine standstill must be detected for a resetting of the phase sequence to the set preferred posi-
tion.
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
>Phs-rotation reversal , you change over the phase sequence of all meas-
>Invert Phases , you change over the phase sequence per measuring point.
Vector with Different Phase Sequences
>Phs-rotation reversal . This switches over the phase sequence simultane-
Protection and Automation Functions
7.23 Phase-Sequence Switchover
863