. Electric railway journal . t, 42-cycle primary current is in use in railwaywork in Milan, Italy. Another is in use in Asnieres,France, of 300-kw. capacity at 600 volts. The Birming-ham Corporation of England has a 275-kw., 450-voltequipment at Harbone substation. In constructing the large power rectifier the resultsobtained from the glass-bulb type are of little assistanceas the. aspect of the problem is entirely changed. Oneof the principal problems connected with this apparatus,but one which with the bulb type was quite simple, hasbeen to make a tank of sufficient capacity that would beabs
. Electric railway journal . t, 42-cycle primary current is in use in railwaywork in Milan, Italy. Another is in use in Asnieres,France, of 300-kw. capacity at 600 volts. The Birming-ham Corporation of England has a 275-kw., 450-voltequipment at Harbone substation. In constructing the large power rectifier the resultsobtained from the glass-bulb type are of little assistanceas the. aspect of the problem is entirely changed. Oneof the principal problems connected with this apparatus,but one which with the bulb type was quite simple, hasbeen to make a tank of sufficient capacity that would beabsolutely tight under all conditions. Without goinginto detailed description, it is sufficient to say that in theapparatus under the present state of development theproblem of sealing has been solved satisfactorily. The rectifier consists of an arc chamber or cylinderhaving a cylindrical extension at the top, both cylinderand extension being built of steel plate. The arc oper-ates in the arc chamber between the main anodes, of. Three Standard Units Designed for Direct-Current Output at300, 600 and 900 Amp. at Any Voltage up to 800 which there are six when six-phase connection is used,and the cathode or body of mercury in the bottom. Thearc is started by an auxilliary ignition anode whichautomatically makes contact with the mercury cathodewhen the circuit through a solenoid operating thisanode is energized. Supplying each rectifier bank or individual cylinderas the case may be there is a stepdown transformersuited to the conditions of primary voltage on the sup-ply line and delivering current to the rectifier at avoltage suited to the required direct-current requirement is similar to that of rotary con-verters, though the ratio of secondary voltage to thedirect-current voltage differs from that of either thethree-ring or the six-ring converter. The rectifier economizes floor space as the cylinderunit need not be accessible for operating attention, 95 1 1 1000 Kw. 55050
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