Checking Closing Conditions in Asynchronous Systems
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Figure 6-74
Closing Conditions when Switching Asynchronous Systems
In this operating mode, compliance with the voltage difference ΔV and frequency difference Δf conditions is
checked. The function calculates the time point of the close command taking into account the angular differ-
ence Δα and the closing time of the circuit breaker. This is calculated so that the voltage phasors are equal at
the moment of pole contact by the circuit breaker (ΔV ≈ 0, Δα ≈ 0).
Ranges in the Voltage-Frequency Diagram (V-f Diagram)
Figure 6-75 shows the setting parameters for synchronous and asynchronous conditions in the V-f diagram.
The frequency range is very narrow owing to the functional principle in the case of synchronous systems.
Control Functions
6.4 Synchronization Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 383
C53000-G5040-C015-9, Edition 11.2017
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