METHOD OF MANUFACTURING A BAR FITTED WITH A POTENTIAL-CONTROL DEVICES FOR BAR-WOUND HIGH-VOLTAGE WINDINGS FOR A ROTATING ELECTRIC MACHINE

摘要

The aim of the inention is to provide a method which makes it possible to mount an external potential-control device in place on an individual bar before the bar is impregnated with high-electric resin. The method is used in the manufacture of bars, fitted with a potential-control device, for bar-wound high voltage windings for a rotating electric machine, the method calling for the bar (5) to be covered with insulation (1) and provided with a conducting layer. The part of the bar (5) which fits into the bar-mounting groove is wrapped with a strip (3) having a known, low resistance, and the coil-end projection is wrapped with a strip having a resistance which is dependent on the voltage. This bar (5) is inserted in a calibrated mould for impregnation and subsequent curing, the part of the bar (5) which fits into the mounting groove being covered by protective foil (4). The invention makes it possible for the first time to impregnate the potential-control device with the insulation, thus integrating it with the insulation. This ensures an extremely high resistance to wear in addition to good electrical conductivity. Furthermore, it is possible to examine individual bars closely before they are mounted in place and also to record the potential-control measured values.