Automatic Voltage Regulators for AC Generators without Influence of Waveforms

概要

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The alternating generator used for testing watt-hour meters is wanted to stabilize its terminal voltage within 0.1% for any load change. For this purpose, the automatic voltage regulators employing vacuum tubes have been used. In DC generators, the terminal voltage is kept exactly constant by this method, while in AC generators, automatic regulating operation is abnormal for some kinds of load change. Such phenomena are due to waveforms of the generators. Therefore, when high constancy of voltage is wanted, the circuits free from the influence of waveforms are needed. <BR>Described in this paper are two kinds of automatic voltage regulator for AC generators without influence of waveforms: <BR>(1) Heater of vacuum tube is used as detector of regulator according to effective value of AC voltage and compensating circuits are added for its time lag. <BR>(2) The regulation is also obtained by employing the smoothing circuits-for converting AC vol tage (output voltage) into DC voltage of detector-the elements of which are chosen not to be influ enced by waveforms. Therefore, the relations are sought between the circuits and higher harmonics. <BR>As far as the loads do not generate much distortion in ordinary alternating generators, bothmethods are useful, but the latter is simpler and more practical.
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