. A text-book of electrical engineering;. Fig. 458. Fig. 459 is no longer identical with the supply voltage. If the converter is suppliedthrough a transformer, as is usually the case on account of the high voltagesused for transmission, a special choking coil may not be necessary ifthe transformer has a large magnetic leakage. Let V be the alternating supply voltage and x the reactance of thechoking coil. If the converter be over-excited—^by cutting resistance outof the field rheostat—we have seen that it will take a leading current (seep. 355). If, on the other hand, it be under-excited,
. A text-book of electrical engineering;. Fig. 458. Fig. 459 is no longer identical with the supply voltage. If the converter is suppliedthrough a transformer, as is usually the case on account of the high voltagesused for transmission, a special choking coil may not be necessary ifthe transformer has a large magnetic leakage. Let V be the alternating supply voltage and x the reactance of thechoking coil. If the converter be over-excited—^by cutting resistance outof the field rheostat—we have seen that it will take a leading current (seep. 355). If, on the other hand, it be under-excited, the current taken will 139- The Voltage Regulation of Rotary Converters 455 lag behind the terminal Assuming that the power remains ^ will be constant, so that the locus of the end of the currentvector in Fig. 458 will be a horizontal line. The current / will be a minimumwhen it is in phase with V (Fig. 458). The vector V may be spht up intotwo components, I. x, 90° ahead of I, representing the across the chokingcoi
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