This model will send a block order to transformers with
tap-changers to block the tap to its current step if the voltage
becomes lower than a threshold on one controlled node. Such a
mechanism enables to avoid voltage collapse on situations where the
tap actions become negative for the system stability.
The detailed tap-changer-blocking behavior is explained in the
following state diagram:
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.Dynawo.Electrical.Controls.Voltage.TapChangerBlocking1