Tag:transformer=phase_angle_regulator
 transformer = phase_angle_regulator
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A phase angle regulator is a special transformer for controlling the flow of power in a three-phase network by shifting the phase angle. 
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| Group: power |
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Status: approved
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A phase angle regulator is a special arrangement of several transformers for controlling the flow of power in a multi-phase alternative current network by shifting the phase angle. They are highly useful in large scale power networks as to direct the flow of power in certain parts of the network as wished by operators by adjusting the phase of alternative current on a given line.
We mostly find them in substation=transmission substations. It's big devices unlikely mounted or poles or installed in cabinets. That's why this particular value requires power=transformer and not power=*.
Possible confusion with voltage regulators/boosters
Phase angle regulators transformers may be found with an architecture looking like some transmission voltage_regulator boosters. However, such power boosters and phase_angle_regulator transformers clearly differs:
- The booster's shunt transformer is usual star-star and there is no phases swapping between shunt and series secondaries.
- The phase_angle_regulator's shunt transformer is primary delta and secondary taped series. See Wikipedia. Phases are swapped in the connection between shunt and series units' secondaries.
Visually, a booster transformer is inserted in series in a power line while phase angle regulators transformers are in parallel with the power line they regulates. They should not be confused as they achieve a completely different function.
Windings tagging
Those transformers got special arrangement of their windings, hardly describable with windings:configuration=*, composed of a shunt and series transformers in the same casing. As a consequence, voltage:primary=* often equals voltage:secondary=* on this particular nature of transformers.
It's common to find an additional tertiary side to feed auxiliary systems as well.
Names remain to be found (in general, not only in OSM) for internal windings that don't correspond to primary, secondary or tertiary terminals.
Examples
To be completed