chapter  17
Load-Tap-Change Control and Transformer Paralleling
Pages 16

Tap changing under load (TCUL), be it with load-tap-changing (LTC) power transformers or step-

voltage regulators, is the primary means of dynamically regulating the voltage on utility power systems.

Switched shunt capacitors can also be used for this purpose, but in the context of this discussion, shunt

capacitors are presumed to be applied with the objective of improving the system power factor.