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Operation of mercury arc rectifiers gener ally results in increased harmonic currents in the rectifier supply circuits and may result in increased harmonic voltages. While these harmonics usually are not serious from the standpoint of the power system, they may result in interference to com munication circuits exposed to the power circuits. This paper presents a method of computing these harmonic voltages and currents, and discusses methods of coordi nating telephone systems and a-c power systems supplying rectifiers.

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