[ve6-standardanschluss-dreiphasig-mdrehfeld-030203-kn, 1, en_GB]
Figure 2-3
Connection to three phase voltage transformers (standard connection)
A possible special connection category for the synchrocheck is explained further below in this Function
Description
For the realization of the two-channel feature and the use of the monitoring functionality, the output relays
BO1 (R1) and BO2 (R2) must be exclusively used for the CLOSE command. A typical connection is shown in
Figure 2-4.
[ve6-ein-relais-anschaltung-090403-kn, 1, en_GB]
Figure 2-4 Interconnection of relays for the ON command
Important for understanding of the following versions is the definition of the values. According toFigure 2-3
side 1 is the reference side. This is indexed with 1. This results for voltage U1 the frequency f1 and the phase
angle α1. For the side to be synchronised index 2 is defined. The electrical values of side 2 are then the
voltage U2, the frequency f2 and the phases angle α2.
Formation of the difference values requires definition of the absolute measurement error (Δx = measure value
– true value). The reference value and thus the true value is side 1. This results in the following calculation
regulations:
Difference voltage dU = U2 – U1
A positive result means that voltage U2 is larger than voltage U1. Otherwise the result is negative.
Difference frequency df = f2 – f1
A positive result means that for example the generator frequency is greater than the power system frequency.
This would be the oversynchronous case. If undersynchronous conditions prevail, the result of the difference
frequency is negative.
Functions
2.2 Paralleling Functions
36 SIPROTEC 4, 7VE61 and 7VE63, Manual
C53000-G1176-C163-3, Edition 10.2017
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