APPARATUS FOR CONTROLLING HIGH VOLTAGE BY ABSORPTION OF CAPACITIVE VARS

摘要

: Apparatus for controlling high voltage by absorption of capacitive vars, comprising a stator having a core and a three phase winding connected to the high voltage, and a rotor having magnetic material exhibiting a sharp magnetic saturation. The rotor includes longitudinally extending damper bars inbedded in grooves or slots in a manner similar to the bars used in a squirrel cage rotor. The magnetic structure of the rotor can be of two types - a symmetrical structure for asynchronous operation, and a salient pole structure for synchronous operation. In the case of the symmetrical rotor construction, the stator and rotor constitute a rotating induction reactor which operates in the same manner as a free running, unloaded induction motor. The induction reactor exhibits characteristics similar to a saturable reactor with respect to var versus voltage absorption, but does not have the undesirable harmonics normally present in the saturable reactor. In the case of the salient pole rotor construction the stator and rotor constitute a rotating synchronous reactor which operates in the same manner as a free running unloaded reluctance motor. A series compensation arrangement can be provided by connecting capacitance means in series with the stator winding to reduce the droop characteristic of the incremental saturated inductance of the reactor to almost zero. The transformer connecting the rotating reactor to the high voltage system can be provided with amps for steady state adjustment of the voltage level to be controlled.