. Electric railway journal . power is available forstarting the starting motor. We come next to the con-tactor (No. 4) in the main starting control will not close unless a polyphase relay (No. 18)indicates the presence of sufficient voltage on all phasesand the proper phase rotation. This relay is connectedto the transformer secondaries, so that even if poly- which the main starting contactor (No. 6) is 6 connects the converter rings to the transformersthrough three single-phase reactance coils and the con-verter pulls into step with the line. The Converter Sometimes Co
. Electric railway journal . power is available forstarting the starting motor. We come next to the con-tactor (No. 4) in the main starting control will not close unless a polyphase relay (No. 18)indicates the presence of sufficient voltage on all phasesand the proper phase rotation. This relay is connectedto the transformer secondaries, so that even if poly- which the main starting contactor (No. 6) is 6 connects the converter rings to the transformersthrough three single-phase reactance coils and the con-verter pulls into step with the line. The Converter Sometimes Comes in withReversed Polarity The rush of current at the moment of closing No. 6occasionally reverses the polarity of the machine, whichbuilds up some direct-current potential while on the Open for Aula field Discharge jgg fjjiOpera!ion > Resistance. 5 • if -Switch Closed forAutomatic Operationand Open fori Operation FIG. 2—SIMPLIFIED CIRCUIT DIAGRAM FOR SUBSTATIONWITH AUTOMATIC CONTROL OF MOTOR-STARTEDROTARY CONVERTER.
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