Abstract 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.
Convertor equipment comprising a plurality of single-phase convertor bridges connected in parallel on their DC sides, and having DC terminals and having AC terminals connected to a common AC voltage source for the bridges, each bridge comprising two controllable and two non-controllable rectifier branches, in which the two controllable rectifier branches are connected in series with each other between the DC terminals of the bridge and the two non-controllable rectifier branches are connected in series with each other between the DC terminals of the bridge, said equipment comprising fuses for protecting the rectifiers against over-currents, in which each bridge is provided with a fuse arranged in the AC lead which is connected to the connecting point between the two non-controllable rectifier branches of the bridge.
Claim 2
Dependent Claim
125 words
Convertor equipment comprising a plurality of single-phase convertor bridges connected in parallel on their DC sides, and having DC terminals and having AC terminals connected to a common AC voltage source for the bridges, each bridge comprising two controllable and two non-controllable rectifier branches, in which the two controllable rectifier branches are connected in series with each other between the DC terminals of the bridge and the two non-controllable rectifier branches are connected in series with each other between the DC terminals of the bridge, said equipment comprising fuses for protecting the rectifiers against over-currents, in which each bridge is provided with a fuse arranged in the AC lead which is connected to the connecting point between the two non-controllable rectifier branches of the bridge.