FIELD: on-load voltage regulation in power and converter transformers.
SUBSTANCE: newly introduced in proposed method for transformer winding tap changing without opening load current circuit, including voltage checkup, in which control pulses are supplied to thyristors of thyristor switches, each incorporating thyristors connected in parallel opposition inserted in tap circuits of transformer winding are procedures of checking currents carried by thyristors of each thyristor switch, voltage recording when current crosses zero, and changing-over transformer winding taps by applying control pulses to one of thyristors incorporated in respective switch depending on time remaining till voltage polarity is reversed.
EFFECT: enhanced reliability.
2 cl, 8 dwg
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