![]() Automatic control for LTC transformers and phase shifters can be disabled separately at the case level. This is specified on the Power Flow Solution Tab of the Simulator Options Dialog. Transformer control must not be disabled for the entire case.This is specified on the Options Tabof the Area Records display. The transformer's area must have automatic transformer control enabled.Select Enabled for OPF Only to allow the phase shifter to be a control as part of the OPF solution but not on automatic control as part of the power flow solution. Select Enabled for Power Flow to allow automatic control actions during the power flow solution. Select Not Enabled to completely disable the phase shifter for automatic control. When the transformer is a phase shifter, the Automatic Control Enabled field has three options. This field can also be modified on the Transformer Records display. For an LTC transformer, the transformer's Automatic Control Enabled field must be checked.For a transformer to be used for voltage or flow control, three criteria must be met: ![]() Simulator provides you with a great deal of flexibility in being able to specify which transformers will actually be used for automatic control in the Power Flow Solution. Valid types are 1) No Automatic Control (in which the taps are assumed fixed), 2) voltage regulation (AVR), 3) Reactive Power Control, and 4) Phase Shift Control. The transformer configuration is very important when performing a fault analysis study.Īutomatic Control Type provides the type of transformer. The phase angle field can be non-zero for LTC and fixed transformers, most notably +/- 30 ° if the transformer configuration is a delta-wye or wye-delta configuration. For phase-shifting transformers the phase shift value normally ranges from about -40 ° to 40 °. This value normally ranges from 0.9 to 1.1 (1.0 corresponds to no additional transformation). The off-nominal tap ratio determines the additional transformation relative to the nominal transformation. If the transformer is not on automatic control, these values can be changed manually. The Off-nominal Turns Ratio field indicates the voltage transformation, while the Phase Shift Degrees field show the phase shift angle. ![]() Off-nominal Turns Ratio and Phase Shift Degrees Options for specifying transformer control are found on the Transformer Control tab of the Branch Options dialog when in Edit mode and the Transformer tab of the Branch Information Dialog when in Run mode. Phase-shifting transformers, which are less common than LTC transformers, vary the angle of the phase shift across the transformer in order to control the MW power flow through the transformer. Such transformers are called either load-tap-changing (LTC) transformers or tap-changing-under-load (TCUL) transformers.Īnother type of transformer is known as a phase-shifting transformer (phase shifter or phase angle regulator). Most transformers come equipped with taps on the windings to adjust either the voltage transformation or the reactive flow through the transformer. Transformers are used to transfer power between different voltage levels or to regulate real or reactive flow through a particular transmission corridor. In the process of translating the abstract will of the people into a workable legal strategy, however, there was a distortion: business logic prevailed. Languages were introduced that promised more distributed development of internet software. Power in the software industry was shifting away from a single dominant operating system vendor. The two applications-System Preferences, actually-Losh discusses are PCKeyboardHack and KeyRemap4MacBook, both of which are free programs written by Takayama Fumihiko. Which is where Losh's software recommendations come in. Most keyboard shortcuts require the user to press a single key or a sequence of keys one after the other.Īn obvious extension would be to start using Shift-Control-Option-Command, but that's hard to type. In computing, a keyboard shortcut is a sequence or combination of keystrokes on a computer keyboard which invokes commands in software.If you want to put machine to sleep use command ⌘ + option ⌥ + power ⌽. I also recomend you to setup hot corner in System preferences - Mission control - Hot Corners. Control ⌃ + shift ⇧ + eject ⏏ or control ⌃ + shift ⇧ + power ⌽ should instantly put your display to sleep.
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