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Checking Closing Conditions of Asynchronous Systems
[losynasy_adj_comm, 1, en_US]
Figure 6-78
In this operating mode, compliance with the voltage difference ΔV and frequency difference Δf conditions is
checked. The function calculates the time of the close command taking into account the angle difference Δα
and the closing time of the circuit breaker. This is calculated in such a way that the voltage phasors are equal
at the moment of closing the circuit-breaker poles (ΔU ≈ 0, Δα ≈ 0).
Ranges in the Voltage-Frequency Diagram (V-f Diagram)
The following figure shows the setting parameters for synchronous and asynchronous conditions in the V-f
diagram. For synchronous systems, the frequency band is very narrow owing to the functional principle.
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Closing Conditions when Switching Asynchronous Systems
Control Functions
6.4 Synchronization Function
391
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