Dual-power power supply circuit and device

The invention provides a dual-power power supply circuit and device, the power supply circuit comprises a first phase sequence relay, a second phase sequence relay, a two-position relay, a closing loop and a front loop, coils of the first and second phase sequence relays are respectively connected w...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: YANG CHANGJIA, HUANG FENGMING, XU JUNSI, HUANG CANFENG
Format: Patent
Sprache:chi ; eng
Schlagworte:
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Beschreibung
Zusammenfassung:The invention provides a dual-power power supply circuit and device, the power supply circuit comprises a first phase sequence relay, a second phase sequence relay, a two-position relay, a closing loop and a front loop, coils of the first and second phase sequence relays are respectively connected with a first three-phase power supply and a second three-phase power supply to detect the phase sequence of the first and second three-phase power supplies; the front loop comprises a first normally open contact of the first phase sequence relay, a first normally open contact of the second phase sequence relay and a first coil of the two-position relay which are connected in series, and the closing loop comprises a first branch circuit and a second branch circuit which are connected in parallel, a two-position relay normally open contact which is connected in series with the first branch circuit and the second branch circuit which are connected in parallel, and a closing coil of the circuit breaker. According to the