The automatic voltage regulation can be used in single or parallel transformer
applications. Parallel operation can be based on Master/Follower (M/F), Negative
Reactance Principle (NRP) or Minimizing Circulating Current (MCC).
OLATCC includes the line drop compensation (LDC) functionality, and the load
decrease is possible with a dynamic voltage reduction.
Either definite time characteristic (DT) or inverse time characteristic (IDMT) is
selectable for delays between the raising and lowering operations.
The function contains a blocking functionality. It is possible to block the voltage
control operations with an external signal or with the supervision functionality of
the function.
9.5.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of the tap changer control with voltage regulator function can be
described using a module diagram. All the modules in the diagram are explained in
the next sections.
1YHT530004D05 D Section 9
Control functions
615 series 727
Technical Manual
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