Siemens 7SJ85 - General Functionality; Description

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Figure 8-57 Phase-Angle Difference Representation dα
Only positive values are permissible for the setting parameters. Inequalities are used to characterize the
setting parameters uniquely. The representation is explained with the example of differential voltage. 2
setting values are necessary to allow unbalanced settings.
The inequality V2 > V1 yields a positive value for dV. The associated parameter is Max. voltage diff.
V2>V1. For the 2nd setting parameter Max. voltage diff. V2<V1, the inequality V2 < V1 applies. It
corresponds to a negative dV.
The procedure is the same for the differential frequency and differential phase angle.
General Functionality
Description
Overview of a Synchronization Stage (Sync Stage)
A synchronization stage can be integrated in the following blocks (see Figure 8-58):
•
Stage control with mode, state control, standby and blocking (description in this chapter)
•
Supervision (description in this chapter)
•
Functional sequence for issuing the closing release (see chapter 8.4.6 Sequence of Functions)
8.4.4
8.4.4.1
Control Functions
8.4 Synchronization Function
SIPROTEC 5, Overcurrent Protection, Manual 1131
C53000-G5040-C017-8, Edition 07.2017