Abstract A current converter for converting three-phase alternating current into direct current, or vice versa, includes for each phase an AC bus bar, a DC shunt bus bar and a plurality of current converter valves carried by and distributed uniformly along the AC bus bar. The current converter valves are connected electrically in parallel between the AC and DC bus bars of each phase, and the DC bus bars of all three phases are interconnected at each end thereof by conductor paths which have an ohmic resistance (as measured between valve junctions nearest to the associated junction on the DC bus bars associated with two different phases) which is always less than one-fifth of the ohmic resistance of one bus bar (as measured between the outermost positioned valves on the bus bar). Also the distance between the centerline of an AC junction on the AC bus bar and the outermost valve junction thereon (nearest to the direct current terminal structure formed from the interconnection at one end of the DC bus bars) amounts to from 60 to 75 percent of the distance between the two outermost valve junctions on the AC bus bar.
In a current converter arrangement for converting three-phase alternating current into direct current, or vice versa wherein for each phase, current converter valves are connected electrically in parallel between an alternating current bus bar and a direct current shunt bus bar and are distributed along the bus bars in substantially uniformly spaced relation, the improvement wherein said direct current shunt bus bars are interconnected at each end thereof by conductor paths the respective ohmic resistances of which between the valve junctions nearest to the associated junction on the direct current shunt bus bars associated with two different phases are always smaller than one-fifth of the ohmic resistance of one direct current shunt bus bar or one alternating current bus bar as measured between the outermost valve junctions on said bus bars, wherein a direct current terminal structure common to all of said direct current shunt bus bars is established from the interconnecting conductor paths at one end of said direct current shunt bus bars, and wherein the distance between the centerline of an alternating current junction on an alternating current bus bar and the outermost valve junction thereon nearest to said direct current terminal structure amounts to from 60 to 75 percent of the distance between the two outermost valve junctions on said alternating current bus bar.
Claim 2
Dependent Claim
217 words
In a current converter arrangement for converting three-phase alternating current into direct current, or vice versa wherein for each phase, current converter valves are connected electrically in parallel between an alternating current bus bar and a direct current shunt bus bar and are distributed along the bus bars in substantially uniformly spaced relation, the improvement wherein said direct current shunt bus bars are interconnected at each end thereof by conductor paths the respective ohmic resistances of which between the valve junctions nearest to the associated junction on the direct current shunt bus bars associated with two different phases are always smaller than one-fifth of the ohmic resistance of one direct current shunt bus bar or one alternating current bus bar as measured between the outermost valve junctions on said bus bars, wherein a direct current terminal structure common to all of said direct current shunt bus bars is established from the interconnecting conductor paths at one end of said direct current shunt bus bars, and wherein the distance between the centerline of an alternating current junction on an alternating current bus bar and the outermost valve junction thereon nearest to said direct current terminal structure amounts to from 60 to 75 percent of the distance between the two outermost valve junctions on said alternating current bus bar.
Claim 3
Dependent Claim
52 words
A current converter arrangement as defined in claim 1 wherein said conductor paths interconnecting said direct current shunt bus bars at the ends thereof opposite to the ends from which said common terminal structure is established are each enclosed by at least one annular iron core in order to increase their inductance.
Claim 4
Dependent Claim
33 words
A current converter arrangement as defined in claim 2 wherein said annular iron cores enclose an end portion of said direct current shunt bus bars which is free from current converter connections thereon.