Phase-Sequence Switchover
Overview of Functions
The Phase-sequence reversal function enables correct execution of the protection of the device and supervi-
sion functions, independently of the phase sequence of the phases in a system or system section.
The phase sequence is set via parameters. You can select between the phase sequences
ABC
or
ACB
.
Binary inputs also provide the option of switching over the phase sequence with respect to the parameter
setting. For example, in pumped-storage hydropower plants with motor or motor/generator operation you
temporarily change the direction of rotation by changing over the phase sequence.
The phase sequence has an effect on calculation of the positive-sequence system and negative-sequence
system values and on calculation of phase-to-phase values. A phase-rotation reversal therefore has an effect
on all protection and supervision functions that use these values.
You can change the phase sequence in 2 ways via binary inputs.
•
Change over the phase sequence for the entire device.
In doing so, all 3-phase measuring points are switched over. All analog inputs are therefore affected (for
example current and voltage inputs simultaneously).
•
Change over the phase sequence per measuring point.
In doing so, only the activated measuring points are switched over. The other measuring points remain
unaffected.
Structure of the Function
The Phase-sequence switchover function is integrated in the Power-system data. You will find the signals in
the DIGSI 5 project tree under Name of the device → Settings. There you will find the parameter for setting
the phase sequence and the binary inputs via which you can influence a change in the phase sequence.
[dwphrein-240211-01.tif, 1, en_US]
Figure 7-176
Structure/Embedding of the Function
Function Description
General
The phase sequence of the system is set in the device via the
Phase sequence
parameter. You will find the
signals in the DIGSI 5 project tree under Name of the device → Settings → Power system → General. There
are 3 methods to change the phase sequence for different operational requirements.
•
Changing the phase sequence via the setting parameter.
–
Note: With version V7.50 and higher, this setting parameter is a reset parameter. If the parameter is
changed and transmitted to the device, the device performs a startup. The parameter change affects
all 3-phase measuring points. If the device is in operation and if measurands are present at the
measuring points, perform a parameter change carefully since this affects all measuring points.
7.23
7.23.1
7.23.2
7.23.3
Protection and Automation Functions
7.23 Phase-Sequence Switchover
862
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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