CONVERTOR EQUIPMENT COMPRISING A PLURALITY OF SINGLE-PHASE CONVERTOR BRIDGES

摘要

In convertor equipment which includes a plurality of convertor bridges connected in parallel on the AC side, the AC terminals of all the convertors are connected to the same AC source. Each convertor bridge is an unsymmetrical semi-controlled bridge, composed of two controllable and two non-controllable rectifiers. The bridges have their DC terminals connected to a common load, such as an armature of a DC motor. The AC terminals of the bridges are connected to the secondary winding of a transformer, the primary winding of which is connected to a feeding AC network. Fuses for protecting the rectifiers against overcurrents are provided in the AC leads which are connected to the connecting points between the two branches of each bridge which contains non-controllable rectifiers.