| 摘要 |
PROBLEM TO BE SOLVED: To provide a synchronism detecting apparatus requiring no auxiliary potential transformer for correcting the angular displacement of a power transformer. SOLUTION: In a synchronism sensing apparatus, the angular displacement of a transformer 2, while is set by an externally set switch 10, is stored in a storing means 14. Based on the information of the angular displacement, a phase adjusting means 15 adjusts the phase shift of the secondary-side voltage of the transformer 2, which is the phase shift relative to its primary-side voltage and is generated by its interposition between a commercial power-system 9A and a starting bus 9B. Through consideration additionally of the phase shift adjusted by the phase adjusting means 15, a computing means 16 decides the synchronism of the starting bus 9B with the commercial power-system 9A. Then, when synchronism is established, a synchronous circuit-breaker 1 is closed to feed a power from the commercial power-system 9A to a synchronous motor 3.
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