Abstract:
A high voltage accelerator power supply for providing a substantial current flow at a high D.C. voltage level including a step-up transformer mounted on an upright insulating frame at an intermediate level approximately midway between bottom and top of the power supply with the transformer being horizontally positioned and corona rings encircling the upper and lower edges of its core. One capacitor is below the level of the transformer core and another is above that level in a voltage-doubling arrangement while the core is electrically connected to a junction intermediate the two capacitors to be at an intermediate voltage level. A modular, flexible snake-like electrical device containing a plurality of series-connected rectifier cartridges positioned end-to-end, or similar components, enclosed within a plastic sheath enables connection with substantially uniform voltage stress distribution between a low voltage and a high voltage terminal by conveniently arranging the device in a helical or snake-like path. An isolation transformer system includes first and second widely separated cores one at ground potential and the other at the high D.C. output voltage of the supply, with an endless loop coupling winding at intermediate D.C. level and encased in a heavy insulation covering wound a few turns on each core.
Abstract:
Mechanically adjustable inductive reactor for series-resonant corona and dielectric testing of capacitive loads, such as, long lengths of high voltage electrical transmission cable which enable unusually long lengths of unusually high voltage cable to be tested conveniently and economically. The invention provides advantages when testing shorter lengths of cable at the usual voltage levels of 150,000 volts or 225,000 volts, but the advantages become greater at the higher voltages and longer lengths forseen in the future by the inventor. A mechanically adjustable high-voltage inductor is resonated directly in series with the cable capacitance of a long cable at high voltage. Three embodiments of mechanically adjustable, low flux-fringing, inductors are disclosed which are linear in inductance variation as a function of mechanical movement and are convenient and quiet to operate as well as being economical in amounts of steel and copper materials employed for a given electrical (kilovoltampere) rating.
Abstract:
A modular cascaded reversible polarity ultrahigh DC voltage supply system is described wherein modular DC voltage power supply units are vertically stacked one upon another and connected in cascaded series relationship to form an ultrahigh DC voltage supply. Each of the modular units, as shown, includes a three-position switch electrically connected in each of the modular power supply units to ''''ground'''' and then to reverse the polarity of the system output voltage, such that the whole electrical load is grounded between polarity reversals. A control is provided external of the vertically stacked modular units and couples to each of the switches at vertical intervals to simultaneously control the polarity positions of the respective switches for reversing the polarity of the system voltage. A grounded intermediate terminal is effectively located in each of the switches to ground the system and also to ground the load connected to it before the polarity of the voltage applied to the load is reversed. The ability to ground the load and then to apply a reversed ultrahigh DC voltage is advantageous for use in test systems, and the modular construction enables various predetermined ultrahigh DC levels to be obtained conveniently by assembling the desired number of stacked modular units.