Coreless iron shunt reactor having high dielectric strength insulation

Claim 1

A SHUNT REACTOR HAVING HIGH INDUCTANCE PER UNIT VOLUME COMPRISING, IN COMBINATION, A CASING, A COOLING AND INSULATING DIELECTRIC LIQUID WITHIN SAID CASING A CYLINDRICAL COIL HAVING A HORIZONTAL AXIS AND AN AXAL OPENINGG THEREIN AND INCLUDING A PLURALITY OF COAXIAL, AXIALLY SPACED PANCAKE WINDINGS DISPOSED IN A STACK AND BEING CONSTRUCTED OF STRIP CONDUCTOR HAVING A WIDTH IN THE AXIAL DIRECTION CONSIDERABLY GREATER THAN THE THICKNESS IN THE RADIAL DIRECTION AND ALSO INCLUDING RADIALLY EXTENDING INSULATING WASHERS DISPOSED BETWEEN ADJACENT PANCAKE WINDINGS, SAID COIL BEING IMMERSED IN SAID DIELECTRIC AND PERMITTING CIRCULATION OF SAID DIELECTRIC LIQUID VERTICALLY BETWEEN SAID AXIALLY SPACED PANCAKE WINDINGS AND ADAPTED TO BE ENERGIZED AT A PREDETERMINED LOW FREQUENCY VOLTAGE DURING OPERATION, A CLOSED MAGNETIC CORE COMPRISING LAMINATIONS IN PLANES PARALLLEL TO THE AXIS OF SAID COIL IMMERSED IN SAID DIELECTRIC LIQUID WITHIN SAID CASING AND HAVING CORE END PORTIONS DISPOSED ADJACENT THE AXIAL ENDS OF SAID COIL AND CORE SIDE PORTIONS PARALLEL TO THE COIL AXIS CONNECTING SAID CORE END PORTIONS, THE AXIAL SPACING BETWEEN ADJACENT PANCAKE WINDINGS BEING APPROXIMATELY UNIFORM AND OFF THE SAME ORDER OF MAGNITUDE AS THE SPACING BETWEEN SAID CORE END PORTIONS AND THE PANCAKE WINDINGS AT THE AXIAL ENDS OF SAID COIL, SAID PANCAKE WINDINGS OF SAID COIL BEING ARRANGED IN TWO SIMILAR COIL HALVES EACH OF WHICH COMPRISES THE PANCAKE WINDINGS BETWEEN THE CENTER AND ONE END OF SAID STACK, THE PANCAKE WINDINGS IN EACH COIL HALF BEING CONNECTED IN SERIES AND THE WINDINGS IN SAID TWO COIL HALVES BEING WOUND IN OPPOSITE DIRECTIONS, THE PANCAKE WINDINGS AT THE AXIAL ENDS OF SAID COIL BEING ADJACENT SAID CORE END PORTIONS AND ADAPTED TO BE CONNECTED TO GROUND, A PAIR OF ADJACENT PANCAKE WINDINGS AT THE CENTER OF THE COIL STACK, ONE OF WHICH IS IN EACH OF SAID COIL HALVES, BEING ADAPTED TO BE CONNECTED TO A HIGH VOLTAGE CONDUCTOR, AND MEANS INCLUDING A HORIZONTAL MEMBER SUPPORTED ADJACENT ITS ENDS DISPOSED WITHIN SAID AXIAL OPENING FOR SUPPORTING SAID COIL WITH ITS AXIS HORIZANTAL AND BEING OF A HIGH DIELECTRIC STRENGTH MONMAGNETIC MATERIAL CAPABLE OF WITHSTANDING WITHOUT FAILURE A POTENTIAL GRADIENT GREATER THAN 10 KILOVOLTS PER INCH WHEN SAID COIL IS ENERGIZED AT SAID PREDETERMINED OPERATING VOLTAGE AND ALSO CAPABLE OF WITHSTANDING WITHOUT FAILURE, THE TENSIL FORCES RESULTING FROM THE WEIGHT OF SAID COIL.