EXCITATION INRUSH CURRENT SUPPRESSING APPARATUS AND EXCITATION INRUSH CURRENT SUPPRESSING METHOD

摘要

According to one embodiment, an excitation inrush current suppressing apparatus comprising: bus voltage measurement equipment which measures each phase voltage of the single-phase AC-side bus; transformer voltage measurement equipment which measures a single-phase-side voltage of the transformer; phase detector which detects a cutoff phase when opening the circuit breaker by monitoring each phase voltage measured by the bus voltage measurement equipment and the single-phase-side voltage measured by the transformer voltage measurement equipment, holds the detected cutoff phase, and outputs the same phase as the held cutoff phase; and close command output device which closes the circuit breaker by the same voltage phase as the cutoff phase output from the phase detector.

主权项

1. An excitation inrush current suppressing apparatus which is used in a power system for selectively connecting and disconnecting a transformer includes a main transformer and a teaser transformer and which converts a three-phase AC voltage into a single-phase AC voltage to and from a single-phase AC-side bus by closing and opening a contact of a single-phase AC-side circuit breaker, and which suppresses an excitation inrush current generated when connecting the transformer, comprising:
bus voltage measurement equipment which measures each phase voltage of the single-phase AC-side bus; transformer voltage measurement equipment which measures a single-phase-side voltage of the transformer; phase detector which detects a cutoff phase when opening the circuit breaker by monitoring each phase voltage measured by the bus voltage measurement equipment and the single-phase-side voltage measured by the transformer voltage measurement equipment, holds the detected cutoff phase, and outputs the same phase as the held cutoff phase; and close command output device which closes the circuit breaker by the same voltage phase as the cutoff phase output from the phase detector.