FIELD: electricity.
SUBSTANCE: active earthing method for a power transformer neutral line through a protective module consists in the creation of a dead-earthed neutral in case of unavailable geomagnetic activity. In periods of geomagnetic storms a mode of an insulated neutral is created and neutral voltage is controlled by switching the protective module on when voltage reaches the rated value. The protective module is made as back-to-back connected thyristors, to control electrodes of which control pulses are sent when the geomagnetic activity is unavailable and the transmission of the above control pulses is stopped in the periods of geomagnetic storms.
EFFECT: simplified power circuit and increased degree of usage of active earthing equipment for the neutral line.
2 dwg
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