Breaker-phase-control switching system and circuit-breaker control unit

摘要

According to one embodiment, there is provided a breaker-phase-control switching system including a merging unit, a superordinate unit, and a circuit-breaker control unit. The circuit-breaker control unit includes a waveform-zero-point-calculation processing unit configured to calculate a current phase, based on absolute time kept by an internal clock and waveform data, and a predicted-breaker-operating-time-calculation processing unit configured to predict a predicted operating time. Further, a command-output-timing-determination processing unit is included which determines a timing for electrically conducting a coil from the absolute time, a preset target phase, a current phase, and a predicted operating time.

主权项

1. A breaker-phase-control switching system, comprising:
a merging unit configured to convert waveform data of an electric quantity of an electric power apparatus into digital data, and transmit the digital data added with time information to a process bus; a superordinate unit configured to transmit a close or an open command for a circuit-breaker to the process bus; a circuit-breaker control unit configured to electrically conduct a close coil or trip coil of the circuit-breaker, based on the waveform data and the close or open command, wherein the circuit-breaker control unit comprises
a second internal clock synchronized with a first inside clock provided in the merging unit or the superordinate unit,a waveform-zero-point-calculation processing unit configured to calculate a current phase which shows a phase at present of an input electric quantity, based on absolute time kept by the second internal clock and on the waveform data,a predicted-breaker-operating-time-calculation processing unit configured to predict a predicted operating time indicating an operating time from electrically conducting the close coil or trip coil of the circuit-breaker until close or open operation of the circuit-breaker is completed, anda command-output-timing-determination processing unit configured to determine a timing for electrically conducting the close coil or the trip coil, from the absolute time kept by the second internal clock, a preset target phase, the current phase calculated by the waveform-zero-point-calculation processing unit, and the predicted operating time predicted by the predicted-breaker-operating-time-calculation processing unit.